采用粉末微电极循环伏安法估测锂离子电池炭负极材料的循环性能

Estimating the Cyclic Performance of Carbon Negative Electrode Materials of Lithium Ion Batteries with the Powder Microelectrode Cyclic Voltammetric Method

阐明了采用粉末微电极循环伏安法估测锂离子电池(LIB)炭负极材料的循环性能的原理.采用该法研究了经高温热处理后具有良好贮锂结构的石油焦试样在1mol/LLiClO4/EC+DEC(1∶1)电解液中的循环性能.实验结果表明,该试样是一种循环性能优越的LIB负极材料:充、放电到第500循环时,放电容量仍保持了最大放电容量的85.02%,充、放电效率为94.96%;同时也证明了粉末微电极循环伏安法用于估测LIB炭负极材料的循环性能的可行性.

The principle of estimating the cyclic performance of carbon negative electrode materials in LIB with the powder microelectrode cyclic voltammetric method was illustrated. The cyclic performance of the petroleum coke sample after high temperature heating, which has a good structure for storing lithium ions in 1 mol/L (LiClO_4)/EC+DEC(1∶1), was studied by this method. The experimental results show that this sample is one kind of negative electrode materials with good cyclic performance in LIB: the discharging capacity of the 500th cycle keeps (85.02%) of the maximum discharging capacity and the charging-discharging efficiency of the 500th cycle is (94.96%). The powder microelectrode cyclic voltammetric method was proved to be able to estimate the cyclic performance of carbon negative electrode materials in LIB.