The electrochemical performance of lithium vanadate/natural graphite composite material as anode for lithium ion batteries

The electrochemical performance of lithium vanadate/natural graphite composite material as anode for lithium ion batteries
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钒酸锂/天然石墨复合材料作为锂离子电池负极的电化学性能

DOI:
10.1016/j.electacta.2014.09.018
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发表时间:
2014-11
影响因子:
6.6
通讯作者:
Zhang Lulu
Zhang Lulu
中科院分区:
材料科学2区
文献类型:
--
作者:
Zhang Jicheng;Ma Jianjun;Yang Xuelin;Zhang Lulu

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采用准溶胶-凝胶法在天然石墨表面均匀沉积了平均粒径约为100 nm的Li 3VO 4纳米颗粒。通过恒电流电池测试研究了Li 3VO 4/天然石墨复合材料作为锂离子电池负极的电化学性能,该复合材料具有良好的循环稳定性和倍率性能。在156 mA g−1的特定电流下,它在初始循环中提供579和427 mAh g− 1的放电和充电容量,在100次循环后保持469和468 mAh g − 1。在234至11,719 mA g−1的各种比电流下循环60次后,当放电/充电电流恢复到234 mA g− 1时,放电容量可恢复到450 mAh g− 1。结果表明,天然石墨对复合电极的电化学性能有重要影响,适量的天然石墨有利于降低复合电极的电荷转移电阻,维持循环过程中电荷转移过程的稳定。
Li3VO4nanoparticles with mean size about 100 nm are uniformly deposited on the surface of natural graphite via a quasi sol gel method. The electrochemical performance of the Li3VO4/natural graphite composite as anode for lithium ion batteries is studied via galvanostatic battery testing, which shows excellent cycle stability and rate capability. At a specific current of 156 mA g−1, it delivers discharge and charge capacity of 579 and 427 mAh g−1in the initial cycle, which maintain of 469 and 468 mAh g−1after 100 cycles. After 60 cycles at various specific currents from 234 to 11,719 mA g−1, the discharge capacity can restore to 450 mAh g−1when reverting the discharge/charge current to 234 mA g−1. It is demonstrated that natural graphite has important effect on the electrochemcial performance of the composite electrode, and an appropriate amount of natural graphite is beneficial to reduce the charge transfer resistance and maintain stable charge transfer process in cycling.
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