High rate discharge capability of single particle electrode of LiCoO2
High rate discharge capability of single particle electrode of LiCoO2
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DOI：
10.1016/j.jpowsour.2008.07.081
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发表时间：
2009-04-01
影响因子：
9.2
通讯作者：
Kanamura, Kiyoshi
中科院分区：
文献类型：
--
作者：
Dokko, Kaoru;Nakata, Natsuko;Kanamura, Kiyoshi
LiCoO 2（直径8 μ m）在有机电解质中的单个颗粒的电化学性质的特征在于使用微电解技术，并且在本研究中检查了市售的微米尺寸的LiCoO 2的高倍率性能。在光学显微镜观察期间，将Pt微丝（直径10 μ m）附着到电解质中的单个LiCoO 2颗粒上，并进行恒电流充放电试验。单个LiCoO 2颗粒（8 μ m直径）的放电容量在3.0-4.2 V vs. Li/Li+的电势范围内为0.157 nA h，这接近于理论容量。单个LiCoO 2颗粒的放电倍率性能是优异的，并且该颗粒表现出其高达30 C（5 nA）的高倍率的全放电容量。在低于30 C的放电速率下，单个颗粒的放电反应不是由Li+的固态扩散控制，而是由电荷转移过程控制。在300 C（50 nA）的高倍率下测量的颗粒的放电容量为0.12 nAh，其大于单个颗粒的满容量的75%。(C)2008 Elsevier B. V.保留所有权利。
The electrochemical properties of a single particle of LiCoO2 (8 mu m in diameter) in an organic electrolyte were characterized using a microelectrocle technique, and the high rate capability of commercially available micron-sized LiCoO2 was examined in this study. A Pt microfilament (10 mu m in diameter) was attached to the single LiCoO2 particle in the electrolyte during optical microscope observation, and galvanostatic charge-discharge tests were carried out. The discharge capacity of the single LiCoO2 particle (8 mu m diameter) was 0.157 nA h in the potential range of 3.0-4.2 V vs. Li/Li+, which was close to the theoretical capacity. The discharge rate capability of the single LiCoO2 particle was excellent, and the particle exhibited its full-discharge capacity up to a high rate of 30 C (5 nA). The discharge reaction of the single particle was not controlled by the solid-state diffusion of Li+, but by the charge transfer process at a rate lower than 30 C. The discharge capacity of the particle measured at a high rate of 300 C (50 nA) was 0.12 nAh, which was more than 75% of the full capacity of a single particle. (C) 2008 Elsevier B.V. All rights reserved.