Analysis of the relationship between vertical imparity distribution of conductive additive and electrochemical behaviors in lithium ion batteries
Analysis of the relationship between vertical imparity distribution of conductive additive and electrochemical behaviors in lithium ion batteries
复制标题
导电添加剂垂直不均匀分布与锂离子电池电化学行为的关系分析
DOI：
10.1016/j.electacta.2018.03.038
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发表时间：
2018-04
影响因子：
6.6
通讯作者：
Wu Jianfei
中科院分区：
文献类型：
--
作者：
Liu Tao;Li Xichao;Sun Shimei;Sun Xiaolin;Cao Fengting;Ohsaka Takeo;Wu Jianfei
本文提出了不同导电炭黑含量的双层LiFePO 4材料，系统评价了导电添加剂的不均匀分布对锂离子电池正极材料电化学性能的影响。详细研究和比较了它们的极化效应和电化学性能。发现在导电添加剂总含量一定的前提下，导电添加剂的分布与去极化效应之间存在简单的经验规律。LiFePO 4/C电极的电化学性能随着下层导电添加剂含量的增加而趋于改善。这是由于下层导电添加剂的含量越高，电子传输的有效路径越多，且显著降低了LiFePO 4/C正极材料与集流体之间的界面阻抗，从而提高了收集电子的能力，维持了可靠的电子传输体系，尤其是在高电流密度下。这一发现对我们通过控制导电添加剂在高性能锂离子电池正极材料中的分布来设计更合理的电极具有启发意义。
In this work, double layered LiFePO4materials with different content of conductive carbon black are proposed for evaluating systematically the influence of imparity distribution of conductive additive on the electrochemical behaviors of cathode material for lithium ion batteries. Their polarization effects and electrochemical performances were investigated and compared in detail. It was found that there exists a simple empirical rule correlating the distribution of the conductive additive and the depolarization effect under the premise that the total content of the conductive additive is kept constant. The electrochemical performance of LiFePO4/C electrode tends to get better with increasing the conductive additive loading in the lower layer. This can be attributed to that the more conductive additive content in the lower layer could provide more available paths for electronic transmission, and markedly decrease the interfacial impedance between LiFePO4/C cathode material and current collector, thus improving the ability of collecting electron and maintaining a reliable electron transport system, especially under high current densities. This finding can enlighten us to design a more rational optimization of the electrode by controlling the distribution of conductive additive in the cathode material for high performance lithium ion batteries.
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