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Zhiliang Liu Shaolei Yang Bingxue Sun Piaoping Yang Jie Zheng Xingguo Li 《Angewandte Chemie (International ed. in English)》2020,59(5):1975-1979
Phosphorus‐rich metal phosphides have very high lithium storage capacities, but they are difficult to prepare. A low‐temperature phosphorization method based on Mg reducing PCl3 in ZnCl2 molten salt at 300 °C is developed to synthesize phosphorus‐rich CuP2@C from a Cu‐MOF derived Cu@C composite. Abnormal oxidation of Cu by Zn2+ in the molten salt is observed, which leads to the porous honeycomb nanostructure and homogeneously distributed ultrafine CuP2 nanocrystals. The honeycomb CuP2@C exhibits excellent lithium storage performance with high reversible capacity (1146 mAh g?1 at 0.2 A g?1) and superior cycling stability (720 mAh g?1 after 600 cycles at 1.0 A g?1), showing the promising application of P‐rich metal phosphides in lithium ion batteries. 相似文献
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Jinfu Zhao Dr. Wenxian Wei Dr. Na Xu Dr. Xiaotong Wang Prof. Limin Chang Dr. Li Wang Luan Fang Dr. Zaiyuan Le Dr. Ping Nie 《Chemphyschem》2022,23(9):e202200233
The front cover artwork is provided by Dr. Ping Nie and Prof. Limin Chang at Jilin Normal University. The image shows one-dimensional silicon–nitrogen-doped carbon nanotube composite fabricated through a dealloying process. The nanotube engineered silicon coupled with conductive carbon coating synergistically boosts the electrochemical performance. Read the full text of the Research Article at 10.1002/cphc.202100832 . 相似文献
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正纳米过渡金属磷化物(MP_x,M=Cu,Ni,Fe,等)在电催化,光催化,超级电容器以及锂离子电池等领域具有很大的应用前景~(1–3)。在储锂应用中,过渡金属磷化物的理论容量与磷的含量成正比,因此富磷的过渡金属磷化物最具吸引力。但目前富磷MP_x的合成比较困难,往往需要特殊的合成条 相似文献
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Qinghua Gong Haiqing Wang Wenhua Song Bin Sun Pei Cao Shaonan Gu Xuefeng Sun Prof. Guowei Zhou 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(8):2654-2661
This work reports the preparation of unique hierarchical yolk/double-shelled SiOx@TiO2@C nanospheres with different voids by a facile sol-gel method combined with carbon coating. In the preparation process, SiOx nanosphere is used as a hard template. Etch time of SiOx yolk affects the morphology and electrochemical performance of SiOx@TiO2@C. With the increase in etch time, the yolk/double-shelled SiOx@TiO2@C with 15 and 30 nm voids and the TiO2@C hollow nanospheres are obtained. The yolk/double-shelled SiOx@TiO2@C nanospheres exhibit remarkable lithium-ion battery performance as anodes, including high lithium storage capacity, outstanding rate capability, good reversibility, and stable long-term cycle life. The unique structure can accommodate the large volume change of the SiOx yolk, provide a unique buffering space for the discharge/charge processes, improve the structural stability of the electrode material during repeated Li+ intercalation/deintercalation processes, and enhance the cycling stability. The SiOx@TiO2@C with 30 nm void space exhibits a high discharge specific capacity of ≈1195.4 mA h g−1 at the current density of 0.1 A g−1 after 300 cycles and ≈701.1 mA h g−1 at 1 A g−1 for over 800 cycles. These results suggest that the proposed particle architecture is promising and may have potential applications in improving various high performance anode materials. 相似文献
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Dr. Dechao Zhang Dr. Yuxuan Liu Zhaoyu Sun Dr. Zhengbo Liu Dr. Xijun Xu Lei Xi Prof. Shaomin Ji Prof. Min Zhu Prof. Jun Liu 《Angewandte Chemie (International ed. in English)》2023,62(44):e202310006
The deployment of lithium metal anode in solid-state batteries with polymer electrolytes has been recognized as a promising approach to achieving high-energy-density technologies. However, the practical application of the polymer electrolytes is currently constrained by various challenges, including low ionic conductivity, inadequate electrochemical window, and poor interface stability. To address these issues, a novel eutectic-based polymer electrolyte consisting of succinonitrile (SN) and poly (ethylene glycol) methyl ether acrylate (PEGMEA) is developed. The research results demonstrate that the interactions between SN and PEGMEA promote the dissociation of the lithium difluoro(oxalato) borate (LiDFOB) salt and increase the concentration of free Li+. The well-designed eutectic-based PAN1.2-SPE (PEGMEA: SN=1: 1.2 mass ratio) exhibits high ionic conductivity of 1.30 mS cm−1 at 30 °C and superior interface stability with Li anode. The Li/Li symmetric cell based on PAN1.2-SPE enables long-term plating/stripping at 0.3 and 0.5 mA cm−2, and the Li/LiFePO4 cell achieves superior long-term cycling stability (capacity retention of 80.3 % after 1500 cycles). Moreover, Li/LiFePO4 and Li/LiNi0.6Co0.2Mn0.2O2 pouch cells employing PAN1.2-SPE demonstrate excellent cycling and safety characteristics. This study presents a new pathway for designing high-performance polymer electrolytes and promotes the practical application of high-stable lithium metal batteries. 相似文献
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以具有高比表面积、分级孔结构和优良导电性的碳纳米笼(CNCs)为载体,制得了粒子尺寸为10~25 nm且高度分散的LiFePO4/CNCs复合物.以LiFePO4/CNCs复合物作为锂离子电池的正极材料,在0.1 C倍率下首次放电比容量达到163 mAh·g-1,15 C和30 C倍率下的放电比容量可达96和75 mAh·g-1;在15 C倍率下循环200圈后,其放电比容量仍保持在92 mAh·g-1,显著优于LiFePO4/CNTs复合物.这些结果表明,LiFePO4/CNCs复合物具有优异的倍率性能和循环稳定性,是一种性能优良的锂离子电池正极材料,其性能源自CNCs载体的高比表面积、分级孔结构和优异导电性以及LiFePO4颗粒的纳米化和高结晶度. 相似文献
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Dr. Zeheng Li Yu-Xing Yao Dr. Shuo Sun Dr. Cheng-Bin Jin Nan Yao Prof. Chong Yan Prof. Qiang Zhang 《Angewandte Chemie (International ed. in English)》2023,62(37):e202303888
Rechargeable lithium batteries are one of the most appropriate energy storage systems in our electrified society, as virtually all portable electronic devices and electric vehicles today rely on the chemical energy stored in them. However, sub-zero Celsius operation, especially below −20 °C, remains a huge challenge for lithium batteries and greatly limits their application in extreme environments. Slow Li+ diffusion and charge transfer kinetics have been identified as two main origins of the poor performance of RLBs under low-temperature conditions, both strongly associated with the liquid electrolyte that governs bulk and interfacial ion transport. In this review, we first analyze the low-temperature kinetic behavior and failure mechanism of lithium batteries from an electrolyte standpoint. We next trace the history of low-temperature electrolytes in the past 40 years (1983–2022), followed by a comprehensive summary of the research progress as well as introducing the state-of-the-art characterization and computational methods for revealing their underlying mechanisms. Finally, we provide some perspectives on future research of low-temperature electrolytes with particular emphasis on mechanism analysis and practical application. 相似文献
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Dr. Xiaofei Yang Dr. Xuejie Gao Dr. Ming Jiang Dr. Jing Luo Jitong Yan Jiamin Fu Dr. Hui Duan Dr. Shangqian Zhao Prof. Yongfu Tang Dr. Rong Yang Ruying Li Prof. Jiantao Wang Dr. Huan Huang Prof. Chandra Veer Singh Prof. Xueliang Sun 《Angewandte Chemie (International ed. in English)》2023,62(5):e202215680
Sulfide electrolytes with high ionic conductivities are one of the most highly sought for all-solid-state lithium batteries (ASSLBs). However, the non-negligible electronic conductivities of sulfide electrolytes (≈10−8 S cm−1) lead to electron smooth transport through the sulfide electrolyte pellets, resulting in Li dendrite directly depositing at the grain boundaries (GBs) and serious self-discharge. Here, a grain-boundary electronic insulation (GBEI) strategy is proposed to block electron transport across the GBs, enabling Li−Li symmetric cells with 30 times longer cycling life and Li−LiCoO2 full cells with three times lower self-discharging rate than pristine sulfide electrolytes. The Li−LiCoO2 ASSLBs deliver high capacity retention of 80 % at 650 cycles and stable cycling performance for over 2600 cycles at 0.5 mA cm−2. The innovation of the GBEI strategy provides a new direction to pursue high-performance ASSLBs via tailoring the electronic conductivity. 相似文献
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锂离子电池负极材料二氧化钛(TiO2)由于其零应变、环境友好和高安全性近年来得到了广泛的研究,但其较低的电子电导和离子迁移率以及较低的比容量(335 mAh·g-1)限制了其应用前景.本文梳理了一种纳米结构TiO2纳米管(TNTs)的研究历程以及最近研究进展,综述了TNTs常见的几种制备方法,即水热法、阳极氧化法和模板法及其形成机理,归纳了各种制备方法的优缺点,讨论了制备过程中各项参量对制得TNTs的影响.阐述了其晶体结构与形貌对电化学性能的影响,指出晶格取向一致、管壁厚度小,纳米管开口且同向排列的TNTs具有更好的电化学性能.同时探讨了针对该材料电导性差、比容量低而进行的包括结构设计、掺杂、复合等一系列改进措施,指出与高电导率及高比容量材料复合是一种方便有效的改进措施.最后总结了各种改性方法取得的进展及存在的不足,展望了TNTs的研究趋势和发展前景. 相似文献
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聚阴离子型锂离子电池正极材料研究进展 总被引:18,自引:0,他引:18
综述了各种聚阴离子型锂离子电池正极材料的研究现状,重点对各种材料的结构和性能的关系,尤其是聚阴离子在正极材料中的作用,以及改善材料电导率的各种方法及其机理进行了总结和探讨. 相似文献
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Synthesis and Electronic/ionic Transport Properties of MoO2/rGO Anode for Lithium Ion Batteries 下载免费PDF全文
MoO2/rGO (reduced graphite oxide) composites have been synthesized by hydrothermal method followed by anneal and characterized by X‐ray diffraction (XRD) and scanning electron microscope (SEM). Galvanostatic charge/discharge testing and electrochemical impedance spectroscopy (EIS) techniques are employed to evaluate the kinetic behaviors of the MoO2/rGO during lithiation/delithiation. The obtained MoO2‐based materials have monoclinic crystal structure, and worm like shape with average dimensions of 100‐200 nm width and 500 nm‐1 μm length. There are two steps of lithium ion intercalation/de‐intercalation for the MoO2/rGO anode at the potential ranging from 1.0 to 3.5 V, locating at ELi/Li+ = 1.60/1.75 V, 1.25/1.40 V, and the first discharge and charge capacities are, respectively, 221.0 and 185.4 mAh g?1. The resistances of RSEI and RCT for the MoO2/rGO anode are 2‐4 Ω and below 5 Ω. Moreover, the lithium diffusion coefficient calculated from the EIS measurement is about 3.6×10?9 cm2 s?1. 相似文献