Carbon-coated Na3V2(PO4)2F3 nanoparticles embedded in a mesoporous carbon matrix as a potential cathode material for sodium-ion batteries with superior rate capability and long-term cycle life

被引:196
作者
Liu, Qiang [1 ]
Wang, Dongxue [1 ]
Yang, Xu [1 ]
Chen, Nan [1 ]
Wang, Chunzhong [1 ,2 ]
Bie, Xiaofei [3 ]
Wei, Yingjin [1 ]
Chen, Gang [1 ,2 ]
Du, Fei [1 ]
机构
[1] Jilin Univ, Minist Educ, Key Lab Phys & Technol Adv Batteries, Coll Phys, Changchun 130012, Peoples R China
[2] Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Peoples R China
[3] Kyoto Univ, Elements Strategy Initiat Catalysts & Batteries, Kyoto 6158520, Japan
关键词
LITHIUM-ION; ELECTROCHEMICAL PROPERTIES; VANADIUM FLUOROPHOSPHATE; ENERGY-STORAGE; PERFORMANCE; INSERTION; NANOFIBERS; CHALLENGES; NANOWIRES; COMPOSITE;
D O I
10.1039/c5ta05939a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A carbon-coated Na3V2(PO4)(2)F-3 nanocomposite (NVPF@C) is successfully realized by a facile sol-gel method. Carbon-coated NVPF nanoparticles are dispersed inside the mesoporous carbon matrix, which can not only improve the electron/ ion transfer among different nanoparticles, but also benefit the electrolyte wetting during cycling. As a result, the NVPF@C cathode demonstrates remarkable Na+ storage performance: a high reversible capacity of nearly 130 mA h g(-1) over 50 cycles between 4.3 and 2.0 V; superior rate capability with specific capacities of nearly 74 and 57 mA h g(-1) at high current densities of 15C (1.92 A g(-1)) and 30C (3.84 A g(-1)), respectively; long-term cycle life with capacity retentions of 70% and 50% over 1000 and 3000 cycles at 10C and 30C rates. Thanks to the manifested high energy and power densities, the NVPF@C nanocomposite is suggested as a promising cathode material for grid energy storage.
引用
收藏
页码:21478 / 21485
页数:8
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