MCMB颗粒度分布对锂离子电池性能的影响

PARTICLE SIZE EFFECT OF MCMB ON THE PERFORMANCE OF LITHIUM ION BATTERIES

研究了锂离子电池中负极炭粉ＭＣＭＢ的颗粒度分布对电池性能的影响。试验结果表明，当颗粒度从１１．１２ μｍ 增大到２４．８１ μｍ 时，电池的第一次充放电效率由８６．２ ％ 增加到９０．５％ ，即颗粒度大，放电容量高。但是，颗粒度大，循环寿命稍差。进一步研究表明，大小颗粒度的重量比为７：３ 的ＭＣＭＢ粉末具有高放电容量和长循环寿命。

A study has been made of particle size effect of MCMB on the performance of lithium ion batteries. Results indicated that the first charge discharge efficiency increased from 86.2 % to 90.5 % when the particle size increased from 11.2 μm to 24.8 μm i.e., the larger the particle size, the higher the discharge capacity. On the contrary, the cycle life was slightly poor for large particle size. Further investigation showed when weight ratio of large particle to small particle is nearly 7:3 in particle size distribution, the battery has the higher discharge capacity capacity and long cycle life.