Investigation of cycle life of Li-LixV2O5 rechargeable batteries
Investigation of cycle life of Li-LixV2O5 rechargeable batteries
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DOI：
10.1016/s0378-7753(03)00734-1
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发表时间：
2003-10-01
影响因子：
9.2
通讯作者：
Zheng, JP
中科院分区：
文献类型：
--
作者：
Moss, PL;Fu, R;Zheng, JP
使用交流阻抗、环境扫描电子显微镜 (ESEM) 和透射电子显微镜 (TEM) 在不同的充电状态下对采用 Li/膜/LixV2O5 结构排列制成的锂可充电电池进行了检查。这些状态包括充电、放电和过度循环。电池在充电状态下获得最低内阻；电池放电时电阻增大；电池在过循环状态下获得了最高的电阻。从ESEM和TEM研究发现，正极表面最初是多孔的；然而，它涂有一层无定形薄膜，并且在过度循环状态下电池的多孔特征也消失了。此外，在过度循环的电池的阴极表面上发现了较高浓度的铝。讨论了容量退化的机制。 (C) 2003 Elsevier B.V. 保留所有权利。
Li rechargeable cells made with structural the arrangement Li/membrane/LixV2O5 were examined under different charge states using AC impedance, environmental scanning electron microscope (ESEM) and transmission electron microscope (TEM). These states include charged, discharged, and over-cycled. The lowest internal resistance was obtained from the cell in the charged state; the resistance increased when the cell was discharged; and the highest resistance was obtained from the cell in the over-cycled state. From the ESEM and TEM studies, it was found that the surface of the cathode was porous initially; however, it was coated with an amorphous film and porous features had also disappeared from the cell in the over-cycled state. In addition, higher concentration of aluminum was found on the surface of the cathode in over-cycled cells. The mechanisms for capacity degradation are discussed. (C) 2003 Elsevier B.V. All rights reserved.