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1.
Chenglong Zhao Feixiang Ding Yaxiang Lu Liquan Chen Yong‐Sheng Hu 《Angewandte Chemie (International ed. in English)》2020,59(1):264-269
Material innovation on high‐performance Na‐ion cathodes and the corresponding understanding of structural chemistry still remain a challenge. Herein, we report a new concept of high‐entropy strategy to design layered oxide cathodes for Na‐ion batteries. An example of layered O3‐type NaNi0.12Cu0.12Mg0.12Fe0.15Co0.15Mn0.1Ti0.1Sn0.1Sb0.04O2 has been demonstrated, which exhibits the longer cycling stability (ca. 83 % of capacity retention after 500 cycles) and the outstanding rate capability (ca. 80 % of capacity retention at the rate of 5.0 C). A highly reversible phase‐transition behavior between O3 and P3 structures occurs during the charge‐discharge process, and importantly, this behavior is delayed with more than 60 % of the total capacity being stored in O3‐type region. Possible mechanism can be attributed to the multiple transition‐metal components in this high‐entropy material which can accommodate the changes of local interactions during Na+ (de)intercalation. This strategy opens new insights into the development of advanced cathode materials. 相似文献
2.
A Biodegradable Polydopamine‐Derived Electrode Material for High‐Capacity and Long‐Life Lithium‐Ion and Sodium‐Ion Batteries 下载免费PDF全文
Tao Sun Zong‐jun Li Heng‐guo Wang Di Bao Fan‐lu Meng Prof. Xin‐bo Zhang 《Angewandte Chemie (International ed. in English)》2016,55(36):10662-10666
Polydopamine (PDA), which is biodegradable and is derived from naturally occurring products, can be employed as an electrode material, wherein controllable partial oxidization plays a key role in balancing the proportion of redox‐active carbonyl groups and the structural stability and conductivity. Unexpectedly, the optimized PDA derivative endows lithium‐ion batteries (LIBs) or sodium‐ion batteries (SIBs) with superior electrochemical performances, including high capacities (1818 mAh g?1 for LIBs and 500 mAh g?1 for SIBs) and good stable cyclabilities (93 % capacity retention after 580 cycles for LIBs; 100 % capacity retention after 1024 cycles for SIBs), which are much better than those of their counterparts with conventional binders. 相似文献
3.
Cong Li Rui Zang Pengxin Li Zengming Man Shijian Wang Xuemei Li Yuhan Wu Shuaishuai Liu Prof. Guoxiu Wang 《化学:亚洲杂志》2018,13(3):342-349
Prussian blue and its analogues (PBAs) have been recognized as one of the most promising cathode materials for room‐temperature sodium‐ion batteries (SIBs). Herein, we report high crystalline and Na‐rich Prussian white Na2CoFe(CN)6 nanocubes synthesized by an optimized and facile co‐precipitation method. The influence of crystallinity and sodium content on the electrochemical properties was systematically investigated. The optimized Na2CoFe(CN)6 nanocubes exhibited an initial capacity of 151 mA h g?1, which is close to its theoretical capacity (170 mA h g?1). Meanwhile, the Na2CoFe(CN)6 cathode demonstrated an outstanding long‐term cycle performance, retaining 78 % of its initial capacity after 500 cycles. Furthermore, the Na2CoFe(CN)6 Prussian white nanocubes also achieved a superior rate capability (115 mA h g?1 at 400 mA g?1, 92 mA h g?1 at 800 mA g?1). The enhanced performances could be attributed to the robust crystal structure and rapid transport of Na ions through large channels in the open‐framework. Most noteworthy, the as‐prepared Na2CoFe(CN)6 nanocubes are not only low‐cost in raw materials but also contain a rich sodium content (1.87 Na ions per lattice unit cell), which will be favorable for full cell fabrication and large‐scale electric storage applications. 相似文献
4.
Cobalt‐Doped FeS2 Nanospheres with Complete Solid Solubility as a High‐Performance Anode Material for Sodium‐Ion Batteries 下载免费PDF全文
Dr. Kai Zhang Mihui Park Limin Zhou Gi‐Hyeok Lee Jeongyim Shin Dr. Zhe Hu Dr. Shu‐Lei Chou Prof. Jun Chen Prof. Yong‐Mook Kang 《Angewandte Chemie (International ed. in English)》2016,55(41):12822-12826
Considering that the high capacity, long‐term cycle life, and high‐rate capability of anode materials for sodium‐ion batteries (SIBs) is a bottleneck currently, a series of Co‐doped FeS2 solid solutions with different Co contents were prepared by a facile solvothermal method, and for the first time their Na‐storage properties were investigated. The optimized Co0.5Fe0.5S2 (Fe0.5) has discharge capacities of 0.220 Ah g?1 after 5000 cycles at 2 A g?1 and 0.172 Ah g?1 even at 20 A g?1 with compatible ether‐based electrolyte in a voltage window of 0.8–2.9 V. The Fe0.5 sample transforms to layered NaxCo0.5Fe0.5S2 by initial activation, and the layered structure is maintained during following cycles. The redox reactions of NaxCo0.5Fe0.5S2 are dominated by pseudocapacitive behavior, leading to fast Na+ insertion/extraction and durable cycle life. A Na3V2(PO4)3/Fe0.5 full cell was assembled, delivering an initial capacity of 0.340 Ah g?1. 相似文献
5.
Peilei Yang Chaoyang Zhang Malin Li Xu Yang Prof. Dr. Chunzhong Wang Dr. Xiaofei Bie Prof. Dr. Yingjin Wei Prof. Dr. Gang Chen Prof. Dr. Fei Du 《Chemphyschem》2015,16(16):3408-3412
As a promising positive electrode material for sodium‐ion batteries (SIBs), layered sodium oxides have attracted considerable attention in recent years. In this work, stoichiometric P2‐phase NaCo0.5Mn0.5O2 was prepared through the conventional solid‐state reaction, and its structural and physical properties were studied in terms of XRD, XPS, and magnetic susceptibility. Furthermore, the P2‐NaCo0.5Mn0.5O2 electrode delivered a discharge capacity of 124.3 mA h g?1 and almost 100 % initial coulombic efficiency over the potential window of 1.5–4.15 V. It also showed good cycle stability, with a reversible capacity and capacity retention reaching approximately 85 mA h g?1 and 99 %, respectively, at the 5 C rate after 100 cycles. Additionally, cyclic voltammetry and ex situ XRD were employed to explain the electrochemical behavior at the different electrochemical stages. Owing to the applicable performances, P2‐NaCo0.5Mn0.5O2 can be considered as a potential positive electrode material for SIBs. 相似文献
6.
Ting Jin Peng‐Fei Wang Qin‐Chao Wang Kunjie Zhu Tao Deng Jiaxun Zhang Wei Zhang Xiao‐Qing Yang Lifang Jiao Chunsheng Wang 《Angewandte Chemie (International ed. in English)》2020,59(34):14511-14516
P2‐type layered oxides suffer from an ordered Na+/vacancy arrangement and P2→O2/OP4 phase transitions, leading them to exhibit multiple voltage plateaus upon Na+ extraction/insertion. The deficient sodium in the P2‐type cathode easily induces the bad structural stability at deep desodiation states and limited reversible capacity during Na+ de/insertion. These drawbacks cause poor rate capability and fast capacity decay in most P2‐type layered oxides. To address these challenges, a novel high sodium content (0.85) and plateau‐free P2‐type cathode‐Na0.85Li0.12Ni0.22Mn0.66O2 (P2‐NLNMO) was developed. The complete solid‐solution reaction over a wide voltage range ensures both fast Na+ mobility (10?11 to 10?10 cm2 s?1) and small volume variation (1.7 %). The high sodium content P2‐NLNMO exhibits a higher reversible capacity of 123.4 mA h g?1, superior rate capability of 79.3 mA h g?1 at 20 C, and 85.4 % capacity retention after 500 cycles at 5 C. The sufficient Na and complete solid‐solution reaction are critical to realizing high‐performance P2‐type cathodes for sodium‐ion batteries. 相似文献
7.
Electrochemical Properties and Sodium‐Storage Mechanism of Ag2Mo2O7 as the Anode Material for Sodium‐Ion Batteries 下载免费PDF全文
Dr. Nan Chen Dr. Yu Gao Meina Zhang Dr. Xing Meng Prof. Chunzhong Wang Prof. Yingjin Wei Dr. Fei Du Prof. Gang Chen 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(21):7248-7254
Silver molybdate, Ag2Mo2O7, has been prepared by a conventional solid‐state reaction. Its electrochemical properties as an anode material for sodium‐ion batteries (SIBs) have been comprehensively examined by means of galvanostatic charge–discharge cycling, cyclic voltammetry, and rate performance measurements. At operating voltages between 3.0 and 0.01 V, the electrode delivered a reversible capacity of nearly 190 mA h g?1 at a current density of 20 mA g?1 after 70 cycles. Ag2Mo2O7 also demonstrated a good rate capability and long‐term cycle stability, the capacity reaching almost 100 mA h g?1 at a current density of 500 mA g?1, with a capacity retention of 55 % over 1000 cycles. Moreover, the sodium storage process of Ag2Mo2O7 has been investigated by means of ex situ XRD, Raman spectroscopy, and HRTEM. Interestingly, the anode decomposes into Ag metal and Na2MoO4 during the initial discharge process, and then Na+ ions are considered to be inserted into/extracted from the Na2MoO4 lattice in the subsequent cycles governed by an intercalation/deintercalation mechanism. Ex situ HRTEM images revealed that Ag metal not only remains unchanged during the sodiation/desodiation processes, but is well dispersed throughout the amorphous matrix, thereby greatly improving the electronic conductivity of the working electrode. The “in situ” decomposition behavior of Ag2Mo2O7 is distinct from that of chemically synthesized, metal‐nanoparticle‐coated electrode materials, and provides strong supplementary insight into the mechanism of such new anode materials for SIBs and may set a precedent for the design of further materials. 相似文献
8.
Youngjin Kim Kwang‐Ho Ha Prof. Seung M. Oh Prof. Kyu Tae Lee 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(38):11980-11992
Na‐ion batteries are an attractive alternative to Li‐ion batteries for large‐scale energy storage systems because of their low cost and the abundant Na resources. This Review provides a comprehensive overview of selected anode materials with high reversible capacities that can increase the energy density of Na‐ion batteries. Moreover, we discuss the reaction and failure mechanisms of those anode materials with a view to suggesting promising strategies for improving their electrochemical performance. 相似文献
9.
目前,碱金属(锂、钠、钾等)离子电池中的锂离子电池已经广泛应用于社会生产生活的各个方面,有力地支撑了社会的自动化、信息化和智能化。然而,由于锂在地壳中的丰度较低,以较高丰度的钠为基础的钠离子电池引起了研究者和社会的广泛关注。其中,正极材料是制约钠离子电池实用化的重要因素之一,人们需要开发出面向实际应用的正极材料。P2结构层状复合金属氧化物钠离子电池正极材料具有资源丰富、制备简单、结构稳定、放电容量高、倍率性能好和循环稳定性较好等优点,获得了研究者的广泛关注,具有实用化前景。这一系列材料由于涉及到多种过渡金属元素的组合,较为复杂。本文针对含单一过渡金属、二元组分过渡金属、三元及以上组分过渡金属的P2结构材料及其优化改性进行了系统性梳理,力求厘清研究脉络,梳理研究思路,并给出了今后发展的方向与预测。P2结构材料的主要问题是提高其初始放电容量,氧还原的应用是解决这一问题的重要方向。此外,优化材料组分及采用具有丰富储量、低成本、高安全性和环境友好性的原材料是进一步降低成本并保护环境的重要研究方向。 相似文献
10.
Dr. Chao Luo Dr. Gui‐Liang Xu Xiao Ji Singyuk Hou Dr. Long Chen Dr. Fei Wang Prof. Jianjun Jiang Dr. Zonghai Chen Dr. Yang Ren Dr. Khalil Amine Prof. Chunsheng Wang 《Angewandte Chemie (International ed. in English)》2018,57(11):2879-2883
Sustainable sodium‐ion batteries (SSIBs) using renewable organic electrodes are promising alternatives to lithium‐ion batteries for the large‐scale renewable energy storage. However, the lack of high‐performance anode material impedes the development of SSIBs. Herein, we report a new type of organic anode material based on azo group for SSIBs. Azobenzene‐4,4′‐dicarboxylic acid sodium salt is used as a model to investigate the electrochemical behaviors and reaction mechanism of azo compound. It exhibits a reversible capacity of 170 mAh g?1 at 0.2C. When current density is increased to 20C, the reversible capacities of 98 mAh g?1 can be retained for 2000 cycles, demonstrating excellent cycling stability and high rate capability. The detailed characterizations reveal that azo group acts as an electrochemical active site to reversibly bond with Na+. The reversible redox chemistry between azo compound and Na ions offer opportunities for developing long‐cycle‐life and high‐rate SSIBs. 相似文献
11.
One‐Pot Synthesis of CoSex–rGO Composite Powders by Spray Pyrolysis and Their Application as Anode Material for Sodium‐Ion Batteries 下载免费PDF全文
Gi Dae Park Prof. Yun Chan Kang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(12):4140-4146
A simple one‐pot synthesis of metal selenide/reduced graphene oxide (rGO) composite powders for application as anode materials in sodium‐ion batteries was developed. The detailed mechanism of formation of the CoSex–rGO composite powders that were selected as the first target material in the spray pyrolysis process was studied. The crumple‐structured CoSex–rGO composite powders prepared by spray pyrolysis at 800 °C had a crystal structure consisting mainly of Co0.85Se with a minor phase of CoSe2. The bare CoSex powders prepared for comparison had a spherical shape and hollow structure. The discharge capacities of the CoSex–rGO composite and bare CoSex powders in the 50th cycle at a constant current density of 0.3 A g?1 were 420 and 215 mA h g?1, respectively, and their capacity retentions measured from the second cycle were 80 and 46 %, respectively. The high structural stability of the CoSex–rGO composite powders for repeated sodium‐ion charge and discharge processes resulted in superior sodium‐ion storage properties compared to those of the bare CoSex powders. 相似文献
12.
Zhuangzhuang Zhang Yichen Du Qin‐Chao Wang Jingyi Xu Yong‐Ning Zhou Jianchun Bao Jian Shen Xiaosi Zhou 《Angewandte Chemie (International ed. in English)》2020,59(40):17504-17510
Amorphous iron phosphate (FePO4) has attracted enormous attention as a promising cathode material for sodium‐ion batteries (SIBs) because of its high theoretical specific capacity and superior electrochemical reversibility. Nevertheless, the low rate performance and rapid capacity decline seriously hamper its implementation in SIBs. Herein, we demonstrate a sagacious multi‐step templating approach to skillfully craft amorphous FePO4 yolk–shell nanospheres with mesoporous nanoyolks supported inside the robust porous outer nanoshells. Their unique architecture and large surface area enable these amorphous FePO4 yolk–shell nanospheres to manifest remarkable sodium storage properties with high reversible capacity, outstanding rate performance, and ultralong cycle life. 相似文献
13.
Dr. Lian Shen Prof. Zhaoxiang Wang Prof. Liquan Chen 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(39):12559-12562
Prussian blues (or iron cyanides) and their analogues are attractive in both fundamental studies and industrial applications owing to their chemical and structural diversity. The large open space in their framework provides tunnels and space for the transport and storage of lithium ions. Two Prussian blues were synthesized by a co‐precipitation method. The nanosized Fe4[Fe(CN)6]3 and cubic FeFe(CN)6 deliver reversible capacities of 95 mAh g?1 and 138 mAh g?1, respectively. In comparison, FeFe(CN)6 shows cycling and rate performances superior to Fe4[Fe(CN)6]3. 相似文献
14.
Alkali‐Metal‐Ion‐Functionalized Graphene Oxide as a Superior Anode Material for Sodium‐Ion Batteries 下载免费PDF全文
Fang Wan Yu‐Han Li Dai‐Huo Liu Jin‐Zhi Guo Prof. Hai‐Zhu Sun Prof. Jing‐Ping Zhang Prof. Xing‐Long Wu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(24):8152-8157
Although graphene oxide (GO) has large interlayer spacing, it is still inappropriate to use it as an anode for sodium‐ion batteries (SIBs) because of the existence of H‐bonding between the layers and ultralow electrical conductivity which impedes the Na+ and e? transformation. To solve these issues, chemical, thermal, and electrochemical procedures are traditionally employed to reduce GO nanosheets. However, these strategies are still unscalable, consume high amounts of energy, and are expensive for practical application. Here, for the first time, we describe the superior Na storage of unreduced GO by a simple and scalable alkali‐metal‐ion (Li+, Na+, K+)‐functionalized process. The various alkali metals ions, connecting with the oxygen on GO, have played different effects on morphology, porosity, degree of disorder, and electrical conductivity, which are crucial for Na‐storage capabilities. Electrochemical tests demonstrated that sodium‐ion‐functionalized GO (GNa) has shown outstanding Na‐storage performance in terms of excellent rate capability and long‐term cycle life (110 mAh g?1 after 600 cycles at 1 A g?1) owing to its high BET area, appropriate mesopore, high degree of disorder, and improved electrical conductivity. Theoretical calculations were performed using the generalized gradient approximation (GGA) to further study the Na‐storage capabilities of functionalized GO. These calculations have indicated that the Na?O bond has the lowest binding energy, which is beneficial to insertion/extraction of the sodium ion, hence the GNa has shown the best Na‐storage properties among all comparatives functionalized by other alkali metal ions. 相似文献
15.
Binary transition metal selenides have been more promising than single transition metal selenides as anode materials for sodium‐ion batteries (SIBs). However, the controlled synthesis of transition metal selenides, especially those derived from metal‐organic‐frameworks with well‐controlled structure and morphology is still challenging. In this paper, highly porous NiCoSe4@NC composite microspheres were synthesized by simultaneous carbonization and selenization of a Ni?Co‐based metal‐organic framework (NiCo‐MOF) and characterized by scanning electron microscopy, transition electron microscopy, X‐Ray diffraction, X‐Ray photoelectron spectroscopy and electrochemical techniques. The rationally engineered NiCoSe4@NC composite exhibits a capacity of 325 mAh g?1 at a current density of 1 A g?1, and 277.8 mAh g?1 at 10 A g?1. Most importantly, the NiCoSe4@NC retains a capacity of 293 mAh g?1 at 1 A g?1 after 1500 cycles, with a capacity decay rate of 0.025 % per cycle. 相似文献
16.
Dr. Prasant Kumar Nayak Liangtao Yang Wolfgang Brehm Prof. Philipp Adelhelm 《Angewandte Chemie (International ed. in English)》2018,57(1):102-120
Mobile and stationary energy storage by rechargeable batteries is a topic of broad societal and economical relevance. Lithium‐ion battery (LIB) technology is at the forefront of the development, but a massively growing market will likely put severe pressure on resources and supply chains. Recently, sodium‐ion batteries (SIBs) have been reconsidered with the aim of providing a lower‐cost alternative that is less susceptible to resource and supply risks. On paper, the replacement of lithium by sodium in a battery seems straightforward at first, but unpredictable surprises are often found in practice. What happens when replacing lithium by sodium in electrode reactions? This review provides a state‐of‐the art overview on the redox behavior of materials when used as electrodes in lithium‐ion and sodium‐ion batteries, respectively. Advantages and challenges related to the use of sodium instead of lithium are discussed. 相似文献
17.
Dr. Haijun Yu Dr. Yang Ren Dongdong Xiao Shaohua Guo Dr. Yanbei Zhu Dr. Yumin Qian Prof. Lin Gu Prof. Haoshen Zhou 《Angewandte Chemie (International ed. in English)》2014,53(34):8963-8969
Sodium‐ion batteries are important alternative energy storage devices that have recently come again into focus for the development of large‐scale energy storage devices because sodium is an abundant and low‐cost material. However, the development of electrode materials with long‐term stability has remained a great challenge. A novel negative‐electrode material, a P2‐type layered oxide with the chemical composition Na2/3Co1/3Ti2/3O2, exhibits outstanding cycle stability (ca. 84.84 % capacity retention for 3000 cycles, very small decrease in the volume (0.046 %) after 500 cycles), good rate capability (ca. 41 % capacity retention at a discharge/charge rate of 10 C), and a usable reversible capacity of about 90 mAh g?1 with a safe average storage voltage of approximately 0.7 V in the sodium half‐cell. This P2‐type layered oxide is a promising anode material for sodium‐ion batteries with a long cycle life and should greatly promote the development of room‐temperature sodium‐ion batteries. 相似文献
18.
Mingzhe Chen Jin Xiao Weibo Hua Zhe Hu Wanlin Wang Qinfen Gu Yuxin Tang Shu‐Lei Chou Hua‐Kun Liu Shi‐Xue Dou 《Angewandte Chemie (International ed. in English)》2020,59(29):12076-12083
Titanium‐based polyanions have been intensively investigated for sodium‐ion batteries owing to their superior structural stability and thermal safety. However, their low working potential hindered further applications. Now, a cation and anion dual doping strategy is used to boost the redox potential of Ti‐based cathodes of Na3Ti0.5V0.5(PO3)3N as a new cathode material for sodium ion batteries. Both the Ti3+/Ti4+ and V3+/V4+ redox couples are reversibly accessed, leading to two distinctive voltage platforms at ca. 3.3 V and ca. 3.8 V, respectively. The remarkably improved cycling stability (86.3 %, 3000 cycles) can be ascribed to the near‐zero volume strain in this unusual cubic symmetry, which has been demonstrated by in situ synchrotron‐based X‐ray diffraction. First‐principles calculations reveal its well‐interconnected 3D Na diffusion pathways with low energy barriers, and the two‐sodium‐extracted intermediate NaTi0.5V0.5(PO3)3N is also a stable phase according to formation energy calculations. 相似文献
19.
Yan‐Fang Zhu Yao Xiao Wei‐Bo Hua Sylvio Indris Shi‐Xue Dou Yu‐Guo Guo Shu‐Lei Chou 《Angewandte Chemie (International ed. in English)》2020,59(24):9299-9304
Structural evolution of the cathode during cycling plays a vital role in the electrochemical performance of sodium‐ion batteries. A strategy based on engineering the crystal structure coupled with chemical substitution led to the design of the layered P2@P3 integrated spinel oxide cathode Na0.5Ni0.1Co0.15Mn0.65Mg0.1O2, which shows excellent sodium‐ion half/full battery performance. Combined analyses involving scanning transmission electron microscopy with atomic resolution as well as in situ synchrotron‐based X‐ray absorption spectra and in situ synchrotron‐based X‐ray diffraction patterns led to visualization of the inherent layered P2@P3 integrated spinel structure, charge compensation mechanism, structural evolution, and phase transition. This study provides an in‐depth understanding of the structure‐performance relationship in this structure and opens up a novel field based on manipulating structural evolution for the design of high‐performance battery cathodes. 相似文献
20.
Tianyi Song Wenjiao Yao Pinit Kiadkhunthod Yongping Zheng Nanzhong Wu Xiaolong Zhou Sarayut Tunmee Suchinda Sattayaporn Yongbing Tang 《Angewandte Chemie (International ed. in English)》2020,59(2):740-745
Sodium‐ion batteries (NIBs) are the most promising alternatives to lithium‐ion batteries in the development of renewable energy sources. The advancement of NIBs depends on the exploration of new electrode materials and fundamental understanding of working mechanisms. Herein, via experimental and simulation methods, we develop a mixed polyanionic compound, Na2Fe(C2O4)SO4?H2O, as a cathode for NIBs. Thanks to its rigid three dimensional framework and the combined inductive effects from oxalate and sulfate, it delivered reversible Na insertion/desertion at average discharging voltages of 3.5 and 3.1 V for 500 cycles with Coulombic efficiencies of ca. 99 %. In situ synchrotron X‐ray measurements and DFT calculations demonstrate the Fe2+/Fe3+ redox reactions contribute to electron compensation during Na+ desertion/insertion. The study suggests mixed polyanionic frameworks may provide promising materials for Na ion storage with the merits of low cost and environmental friendliness. 相似文献