期刊
ELECTROCHIMICA ACTA
卷 71, 期 -, 页码 258-265出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.03.161
关键词
Lithium ion batteries; Electrode thickness; Rate capability; Energy density; Power density
资金
- Natural Science Foundation of China (NSFC) [21073129]
- Department of Science and technology of China [2009AA03Z225863]
LiN1/3Co1/3Mn1/3O2 (NCM) and LiFePO4 (LFP) electrodes of different active material loadings are prepared. The impact of electrode thickness on the rate capability, energy and power density and long-term cycling behavior is comparatively investigated. Peukert coefficient slightly increases with increasing electrode thickness, showing a severe capacity loss at higher rate for thicker electrode. A power-law relation between the maximum working Crate and electrode loading is obtained. Increase of the specific resistance with increasing electrode thickness is not an important factor responsible for the poor rate performance for thicker electrode. The power-law relationship is typical for a diffusion-related system, indicating that Li ion diffusion within the electrode is the rate-determining step for the discharge process. As the result of the deterioration of rate capability, enhancing energy density through increasing electrode thickness is accompanied by a significant loss of power density. Long-term cycling performance is also deteriorated, which is attributed to the high internal resistance and poor mechanical integrity of thicker electrode. (C) 2012 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据