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1.
Svetoslava Vankova Daniele Versaci Julia Amici Anna Ferrari Rosanna Rizzi Angela Altomare Salvatore Guastella Carlotta Francia Silvia Bodoardo Nerino Penazzi 《Journal of Solid State Electrochemistry》2017,21(12):3381-3388
Silicate materials have been proposed as alternative cathodes for Li-ion battery applications. A novel mixture of silicates, labelled Li6MnSi5, based on the molar ratio among the Li/Mn/Si precursors, with promising electrochemical properties as positive electrode material is synthesized through a solid-state reaction. The results indicate the proposed synthetic method as effective for preparation of nanostructured silicate powders with average particle diameter of 30 nm. Structural morphology of the samples was determined using X-ray powder diffraction (XRPD), XPS and FESEM analysis. A joint analysis by XRPD data and by density functional theory (DFT) identified LiHMn4Si5O15, Li2Mn4Si5O15, Li2Si2O5 and Li0.125Mn0.875SiO4 as components of Li6MnSi5 mixture. The electrochemical performance of Li6MnSi5 was evaluated by charge/discharge testing at constant current mode. Li6MnSi5 discharge behaviour is characterized by high capacity value of 480 mA h g?1, although such capacity fades gradually on cycling. Ex situ XPS studies carried out on the electrode in both full charged and discharged states pointed out that Li2Si2O5 is decisive for achieving such high capacity. The discharge/charge plateau is most probably related to the change in the oxidation state of silicon at the surface of the silica material. 相似文献
2.
Dr. Xuanxuan Bi Dr. Matthew Li Dr. Cong Liu Dr. Yifei Yuan Dr. Hao Wang Dr. Baris Key Dr. Rongyue Wang Dr. Reza Shahbazian-Yassar Dr. Larry A. Curtiss Dr. Jun Lu Dr. Khalil Amine 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(51):23178-23182
Lithium–oxygen (Li–O2) batteries have attracted extensive research interest due to their high energy density. Other than Li2O2 (a typical discharge product in Li–O2 batteries), LiOH has proved to be electrochemically active as an alternative product. Here we report a simple strategy to achieve a reversible LiOH-based Li–O2 battery by using a cation additive, sodium ions, to the lithium electrolyte. Without redox mediators in the cell, LiOH is detected as the sole discharge product and it charges at a low charge potential of 3.4 V. A solution-based reaction route is proposed, showing that the competing solvation environment of the catalyst and Li+ leads to LiOH precipitation at the cathode. It is critical to tune the cell chemistry of Li–O2 batteries by designing a simple system to promote LiOH formation/decomposition. 相似文献
3.
Core–Shell‐Structured CNT@RuO2 Composite as a High‐Performance Cathode Catalyst for Rechargeable Li–O2 Batteries
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Dr. Zelang Jian Dr. Pan Liu Dr. Fujun Li Dr. Ping He Dr. Xianwei Guo Prof. Mingwei Chen Prof. Haoshen Zhou 《Angewandte Chemie (International ed. in English)》2014,53(2):442-446
A RuO2 shell was uniformly coated on the surface of core CNTs by a simple sol–gel method, and the resulting composite was used as a catalyst in a rechargeable Li–O2 battery. This core–shell structure can effectively prevent direct contact between the CNT and the discharge product Li2O2, thus avoiding or reducing the formation of Li2CO3, which can induce large polarization and lead to charge failure. The battery showed a high round‐trip efficiency (ca. 79 %), with discharge and charge overpotentials of 0.21 and 0.51 V, respectively, at a current of 100 mA gtotal?1. The battery also exhibited excellent rate and cycling performance. 相似文献
4.
Dr. Shengfu Tong Cuiping Luo Jiade Li Dr. Zongwei Mei Prof. Mingmei Wu Prof. Anthony P. O'Mullane Prof. Huaiyong Zhu 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(47):21095-21099
The practical applications of non-aqueous lithium-oxygen batteries are impeded by large overpotentials and unsatisfactory cycling durability. Reported here is that commonly encountered fatal problems can be efficiently solved by using a carbon- and binder-free electrode of titanium coated with TiO2 nanotube arrays (TNAs) and gold nanoparticles (AuNPs). Ultraviolet irradiation of the TNAs generates positively charged holes, which efficiently decompose Li2O2 and Li2CO3 during recharging, thereby reducing the overpotential to one that is near the equilibrium potential for Li2O2 formation. The AuNPs promote Li2O2 formation, resulting in a large discharge capacity. The electrode exhibits excellent stability with about 100 % coulombic efficiency during continuous cycling of up to 200 cycles, which is due to the carbon- and binder-free composition. This work reveals a new strategy towards the development of highly efficient oxygen electrode materials for lithium-oxygen batteries. 相似文献
5.
Identifying Reactive Sites and Transport Limitations of Oxygen Reactions in Aprotic Lithium‐O2 Batteries at the Stage of Sudden Death
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Dr. Jiawei Wang Yelong Zhang Limin Guo Prof. Erkang Wang Prof. Zhangquan Peng 《Angewandte Chemie (International ed. in English)》2016,55(17):5201-5205
Discharging of the aprotic Li‐O2 battery relies on the O2 reduction reaction (ORR) forming solid Li2O2 in the positive electrode, which is often characterized by a sharp voltage drop (that is, sudden death) at the end of discharge, delivering a capacity far below its theoretical promise. Toward unlocking the energy capabilities of Li‐O2 batteries, it is crucial to have a fundamental understanding of the origin of sudden death in terms of reactive sites and transport limitations. Herein, a mechanistic study is presented on a model system of Au|Li2O2|Li+ electrolyte, in which the Au electrode was passivated with a thin Li2O2 film by discharging to the state of sudden death. Direct conductivity measurement of the Li2O2 film and in situ spectroscopic study of ORR using 18O2 for passivation and 16O2 for further discharging provide compelling evidence that ORR (and O2 evolution reaction as well) occurs at the buried interface of Au|Li2O2 and is limited by electron instead of Li+ and O2 transport. 相似文献
6.
Kai Chen Gang Huang Jin‐Ling Ma Jin Wang Dong‐Yue Yang Xiao‐Yang Yang Yue Yu Xin‐Bo Zhang 《Angewandte Chemie (International ed. in English)》2020,59(38):16661-16667
The lithium (Li)–air battery has an ultrahigh theoretical specific energy, however, even in pure oxygen (O2), the vulnerability of conventional organic electrolytes and carbon cathodes towards reaction intermediates, especially O2?, and corrosive oxidation and crack/pulverization of Li metal anode lead to poor cycling stability of the Li‐air battery. Even worse, the water and/or CO2 in air bring parasitic reactions and safety issues. Therefore, applying such systems in open‐air environment is challenging. Herein, contrary to previous assertions, we have found that CO2 can improve the stability of both anode and electrolyte, and a high‐performance rechargeable Li–O2/CO2 battery is developed. The CO2 not only facilitates the in situ formation of a passivated protective Li2CO3 film on the Li anode, but also restrains side reactions involving electrolyte and cathode by capturing O2?. Moreover, the Pd/CNT catalyst in the cathode can extend the battery lifespan by effectively tuning the product morphology and catalyzing the decomposition of Li2CO3. The Li–O2/CO2 battery achieves a full discharge capacity of 6628 mAh g?1 and a long life of 715 cycles, which is even better than those of pure Li–O2 batteries. 相似文献
7.
Kai Chen Gang Huang Jin-Ling Ma Jin Wang Dong-Yue Yang Xiao-Yang Yang Yue Yu Prof. Xin-Bo Zhang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(38):16804-16810
The lithium (Li)–air battery has an ultrahigh theoretical specific energy, however, even in pure oxygen (O2), the vulnerability of conventional organic electrolytes and carbon cathodes towards reaction intermediates, especially O2−, and corrosive oxidation and crack/pulverization of Li metal anode lead to poor cycling stability of the Li-air battery. Even worse, the water and/or CO2 in air bring parasitic reactions and safety issues. Therefore, applying such systems in open-air environment is challenging. Herein, contrary to previous assertions, we have found that CO2 can improve the stability of both anode and electrolyte, and a high-performance rechargeable Li–O2/CO2 battery is developed. The CO2 not only facilitates the in situ formation of a passivated protective Li2CO3 film on the Li anode, but also restrains side reactions involving electrolyte and cathode by capturing O2−. Moreover, the Pd/CNT catalyst in the cathode can extend the battery lifespan by effectively tuning the product morphology and catalyzing the decomposition of Li2CO3. The Li–O2/CO2 battery achieves a full discharge capacity of 6628 mAh g−1 and a long life of 715 cycles, which is even better than those of pure Li–O2 batteries. 相似文献
8.
Xiao‐yang Yang Xi‐lan Feng Xin Jin Ming‐zhe Shao Bao‐lin Yan Jun‐min Yan Yu Zhang Xin‐bo Zhang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(46):16563-16567
The flexible Li‐O2 battery is suitable to satisfy the requirements of a self‐powered energy system, thanks to environmental friendliness, low cost, and high theoretical energy density. Herein, a flexible porous bifunctional electrode with both electrocatalytic and photocatalytic activity was synthesized and introduced as a cathode to assemble a high‐performance Li‐O2 battery that achieved an overpotential of 0.19 V by charging with the aid of solar energy. As a proof‐of‐concept application, a flexible Li‐O2 battery was constructed and integrated with a solar cell via a scalable encapsulate method to fabricate a flexible self‐powered energy system with excellent flexibility and mechanical stability. Moreover, by exploring the evolution of the electrode morphology and discharge products (Li2O2), the charging process of the Li‐O2 battery powered by solar energy and solar cell was demonstrated. 相似文献
9.
Xian Ming Wu Jin Lian Liu Run Xiu Li Shang Chen Ming You Ma 《Russian Journal of Electrochemistry》2011,47(8):917-922
Solid-state thin-film lithium-ion battery of LiMn2O4/Li1.3Al0.3Ti1.7(PO4)3/LiMn2O4 is prepared by spray technique using Li1.3Al0.3Ti1.7(PO4)3 sintered pellet as both electrolyte and substrate. The thin-film battery is heat-treated by rapid thermal annealing. Phase
identification, morphology and electrochemical properties of the sintered pellets and thin-film battery are investigated by
X-ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy, cyclic voltammetry, and galvanostatic
charge-discharge experiments, respectively. The results show that LiMn2O4 films with some pores are well deposited on the surface of Li1.3Al0.3Ti1.7(PO4)3 sintered pellet. The discharge current density and temperature have considerable effect on discharge capacity of the thin-film
battery. LiMn2O4/Li1.3Al0.3Ti1.7(PO4)3/LiMn2O4 thin-film battery can be easily cycled with a capacity loss of 0.213% per cycle when 50 cycles are carried out. 相似文献
10.
Lithium‐Rich Layered Oxide Li1.18Ni0.15Co0.15Mn0.52O2 as the Cathode Material for Hybrid Sodium‐Ion Batteries
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Zhixuan Wei Dr. Yu Gao Lei Wang Chaoyang Zhang Xiaofei Bian Qiang Fu Prof. Chunzhong Wang Prof. Yingjin Wei Dr. Fei Du Prof. Gang Chen 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(33):11610-11616
Li‐rich layered oxide Li1.18Ni0.15Co0.15Mn0.52O2 (LNCM) is, for the first time, examined as the positive electrode for hybrid sodium‐ion battery and its Na+ storage properties are comprehensively studied in terms of galvanostatic charge–discharge curves, cyclic voltammetry and rate capability. LNCM in the proposed sodium‐ion battery demonstrates good rate capability whose discharge capacity reaches about 90 mA h g?1 at 10 C rate and excellent cycle stability with specific capacity of about 105 mA h g?1 for 200 cycles at 5 C rate. Moreover, ex situ ICP‐OES suggests interesting mixed‐ions migration processes: In the initial two cycles, only Li+ can intercalate into the LNCM cathode, whereas both Li+ and Na+ work together as the electrochemical cycles increase. Also the structural evolution of LNCM is examined in terms of ex situ XRD pattern at the end of various charge–discharge scans. The strong insight obtained from this study could be beneficial to the design of new layered cathode materials for future rechargeable sodium‐ion batteries. 相似文献
11.
S. N. Eliseeva K. A. Vorob’eva E. V. Shkreba R. V. Apraksin V. V. Kondrat’ev 《Russian Journal of Applied Chemistry》2017,90(8):1230-1233
Lithium-ion battery based on LiMn2O4/Li4Ti5O12 materials was assembled for the first time. The cathode and anode of this battery are prepared with the aqueous combined binder poly-3,4-ethylenedioxythiophene: polystyrene sulfonate/carboxymethylcellulose (without polyvinylidene fluoride). The capacity of the LiMn2O4/Li4Ti5O12 battery was found to be 75 mA h g–1 at 0.1 C and 55 mA h g–1 at 1 C. A 95% capacity was retained after 100 charge-discharge cycles. The batteries demonstrated a high Coulombic efficiency close to 100%. Scanning electron microscopy demonstrated that using the conducting binder poly-3,4-ethylenedioxythiophene: polystyrene sulfonate/carboxymethylcellulose provides formation of dense compact layers of electrode materials with good adhesion to the substrate. The electrode structure remains maintained after 100 charge-discharge cycles. 相似文献
12.
Yanyi Liu Jiangang Li Qifeng Zhang Nan Zhou Evan Uchaker Guozhong Cao 《Electrochemistry communications》2011,13(11):1276-1279
Porous nanostructured V2O5 films were prepared by electrodeposition from V2O5 sol with the addition of block copolymer Pluoronic P123, and they can be readily applied as Li-ion battery cathode without adding any polymer binder or conductive additives. SEM images showed an ideal morphology for Li+ intercalation favored charge transfer kinetics, which is a combination of homogeneously distributed nano-pores and V2O5 nanoparticles. Electrochemical measurements revealed that, the porous nanostructured V2O5 films have a high discharge capacity of 160 mAh/g at 9 A/g, and maintain 240 mAh/g after 40 cycles at 300 mA/g. The excellent Li+ intercalation property could be ascribed to the high surface area, sufficient contact between electrode materials and electrolyte, short Li+ diffusion path, as well as the good accommodation for volume change which are benefited from homogeneously distributed nano-pores and V2O5 nanoparticles. 相似文献
13.
Hee‐Dae Lim Hyeokjun Park Hyungsub Kim Jinsoo Kim Byungju Lee Youngjoon Bae Hyeokjo Gwon Prof. Kisuk Kang 《Angewandte Chemie (International ed. in English)》2015,54(33):9663-9667
Primary Li–SO2 batteries offer a high energy density in a wide operating temperature range with exceptionally long shelf life and have thus been frequently used in military and aerospace applications. Although these batteries have never been demonstrated as a rechargeable system, herein, we show that the reversible formation of Li2S2O4, the major discharge product of Li–SO2 battery, is possible with a remarkably smaller charging polarization than that of a Li–O2 battery without the use of catalysts. The rechargeable Li–SO2 battery can deliver approximately 5400 mAh g?1 at 3.1 V, which is slightly higher than the performance of a Li–O2 battery. In addition, the Li–SO2 battery can be operated with the aid of a redox mediator, exhibiting an overall polarization of less than 0.3 V, which results in one of the highest energy efficiencies achieved for Li–gas battery systems. 相似文献
14.
Nika Mahne Sara E. Renfrew Prof. Bryan D. McCloskey Dr. Stefan A. Freunberger 《Angewandte Chemie (International ed. in English)》2018,57(19):5529-5533
Solid alkali metal carbonates are universal passivation layer components of intercalation battery materials and common side products in metal‐O2 batteries, and are believed to form and decompose reversibly in metal‐O2/CO2 cells. In these cathodes, Li2CO3 decomposes to CO2 when exposed to potentials above 3.8 V vs. Li/Li+. However, O2 evolution, as would be expected according to the decomposition reaction 2 Li2CO3→4 Li++4 e?+2 CO2+O2, is not detected. O atoms are thus unaccounted for, which was previously ascribed to unidentified parasitic reactions. Here, we show that highly reactive singlet oxygen (1O2) forms upon oxidizing Li2CO3 in an aprotic electrolyte and therefore does not evolve as O2. These results have substantial implications for the long‐term cyclability of batteries: they underpin the importance of avoiding 1O2 in metal‐O2 batteries, question the possibility of a reversible metal‐O2/CO2 battery based on a carbonate discharge product, and help explain the interfacial reactivity of transition‐metal cathodes with residual Li2CO3. 相似文献
15.
Ding Zhu Lei Zhang Ming Song Xiaofei Wang Rui Mi Hao Liu Jun Mei Leo W. M. Lau Yungui Chen 《Journal of Solid State Electrochemistry》2013,17(9):2539-2544
The intermittent operation of the aprotic Li-O2 battery is systematically studied in this paper. A combined study of the battery charge retention and the electrolyte stability to O2 suggests a low self-discharge rate of the Li-O2 battery, which is a prerequisite to achieve desirable intermittent discharge performance. The battery under intermittent operation exhibits significantly improved discharge performance as compared to the continuously discharged one. It is found that the capacity output is directly associated with the time interval between two discharge steps and with the capacity limit for each discharge step. The open-circuit potential and linear scan voltammetry analyses confirm that a “mass recovery” process, corresponding to the concentration relaxation of the oxygen which is available at the cathode, proceed during the discharge intervals. In the “mass recovery” process, an increased amount of O2 homogeneously redistributes at the electrolyte/carbon interface at both sides of the electrode, which relieves the O2 transport limit, enhances the availability of O2 and the utilization of carbon material for the cathode, and thus significantly improves the discharge performance of the aprotic Li-O2 battery. 相似文献
16.
Anirudha Jena Po-Han Lee Wei Kong Pang Kuang-Che Hsiao Vanessa K. Peterson Tamim Darwish Nageshwar Yepuri She-Huang Wu Ho Chang Ru-Shi Liu 《中国化学会会志》2020,67(3):344-352
LiCoO2 (LCO) with average particle distribution of 8 μm (LCO-A) and 11 μm (LCO-B) exhibit substantial differences in cycle performance. The half-cells have similar first-cycle discharge capacities of 173 and 175 mAh/g at 0.25 C, but after 100 cycles, the discharge capacities are substantially different, that is, 114 and 141 mAh/g for LCO-A and LCO-B, respectively. Operando neutron powder diffraction of full LCO||Li4Ti5O12 batteries show differences in the LCO reaction mechanism underpinning the electrochemical behavior. LCO-A follows a purely solid solution reaction during cycling compared to the solid solution and two-phase reaction mechanism in LCO-B. The absence of the two-phase reaction in LCO-A is consistent with a homogeneous distribution of Li throughout the particle. The two-phase reaction in LCO-B reflects two distinguishable distributions of Li within the particles. The faster capacity decay in LCO-A is correlated to an increase in electrode cracking during battery cycles. 相似文献
17.
G. J. Wang L. C. Yang Q. T. Qu B. Wang Y. P. Wu R. Holze 《Journal of Solid State Electrochemistry》2010,14(5):865-869
An aqueous rechargeable lithium battery (ARLB) using an electroactive polymer, polypyrrole (PPy), as a negative electrode;
a lithium ion intercalation compound LiCoO2 as a positive electrode; and Li2SO4 aqueous solution as an electrolyte and its working mechanism are described. The charge/discharge process is associated with
the doping/un-doping of anions at the negative electrode and intercalation/deintercalation of lithium ions at the positive
electrode. The average output voltage of the PPy//LiCoO2 battery is about 0.85 V. This battery exhibits excellent cycling performance. This new technology solves the major problem
of poor cycling life of ARLBs and will provide a new strategy to explore advanced energy storage and conversion systems. 相似文献
18.
Yu Zhang Shuting Zhang Junguo Ma Dr. Xin Chen Dr. Caiyun Nan Prof. Chen Chen 《Angewandte Chemie (International ed. in English)》2023,62(15):e202218926
Li-oxygen batteries have attracted much attention due to its ultra-high theoretical specific capacity, but the discharge product Li2O2 is easy to accumulate, leading to low battery stability. Here, we demonstrate a series of high-efficiency cathode catalysts of Co3O4 loaded with single-atomic metals (M=Ru, Pd, Pt, Au, Ir). The single-atomic metal could substitute the central Co atom in the octahedral coordination structure and maintain the structural stability; benefiting from the electron promoter effect, rendering more highly active Co3+ exposed, providing rich nucleation sites for Li2O2 deposition. And the loaded M atoms could separate the active Co3+ centers, thereby regulating the dispersion of Li2O2 to obtained a sheet-like morphology, which could facilitate its decomposition in the subsequent charge cycle. Our work found that the single atoms could effectively modulate the active metal oxide with which it is coordinated, thus collectively boosting the catalytic performance. 相似文献
19.
Improving the Electrochemical Performance of the Li4Ti5O12 Electrode in a Rechargeable Magnesium Battery by Lithium–Magnesium Co‐Intercalation
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Na Wu Zhen‐Zhong Yang Hu‐Rong Yao Dr. Ya‐Xia Yin Prof. Lin Gu Prof. Yu‐Guo Guo 《Angewandte Chemie (International ed. in English)》2015,54(19):5757-5761
Rechargeable magnesium batteries have attracted recent research attention because of abundant raw materials and their relatively low‐price and high‐safety characteristics. However, the sluggish kinetics of the intercalated Mg2+ ions in the electrode materials originates from the high polarizing ability of the Mg2+ ion and hinders its electrochemical properties. Here we report a facile approach to improve the electrochemical energy storage capability of the Li4Ti5O12 electrode in a Mg battery system by the synergy between Mg2+ and Li+ ions. By tuning the hybrid electrolyte of Mg2+ and Li+ ions, both the reversible capacity and the kinetic properties of large Li4Ti5O12 nanoparticles attain remarkable improvement. 相似文献
20.
《Electrochemistry communications》2008,10(1):16-19
NiO, Li0.68Ni1.32O2 and Li0.68Ni1.32O2/Ag composite as anodes for Li-ion batteries are reported. Li0.68Ni1.32O2 decomposed to Ni and Li2O when discharged to 0.02 V, according to XRD analysis, which was similar to NiO. Increased initial coulombic efficiency was obtained for the Li0.68Ni1.32O2 electrode (73%), higher than that of NiO (64.9%), but its cycling performance became worse because poorer conductive Li2O formed when the first discharge process was finished. However, the Li0.68Ni1.32O2/Ag electrode exhibited better cycling performance than NiO and Li0.68Ni1.32O2, because the Ag nanoparticles in the composite improved the conductivity of the electrode. The initial coulombic efficiency for Li0.68Ni1.32O2/Ag is still as high as 72%, nearly the same as that of Li0.68Ni1.32O2. 相似文献