聚合物锂离子电池的高倍率放电性能研究

研究了正极厚度、正极导电剂含量、负极材料、电池尺寸以及电解液对聚合物锂离子电池高倍率放电性能的影响,结果表明:提高正极导电剂的含量能提高电池10.0 C倍率的放电性能;采用薄正极、中间相碳微球(MCMB)负极材料扣大电池尺寸设计,也能提高电池的高倍率放电性能;在高于10.0 C倍率放电时,功能电解液对高倍率放电性能有较大影响.通过各种影响因素的优化组合,得到了一种聚合物锂离子电池.该电池的最大放电倍率可达20.0 C;300次循环后,10.0 C放电容量仍保持初始容量的84%.

Study on the high rate discharge performance of polymer Li-ion battery

The influences of cathode thickness,conductive agent content in cathode,anode materials,battery size and electrolyte on the high rate discharge performance of polymer Li-ion battery were studied.The results showed that increasing conductive agent content in cathode could improve the 10.0 C rate discharge performance of the battery.Thin cathode,mesocarbon microbeads(MCMB) anode material,bigger battery size design could improve the high rate discharge performance of the battery.The functional electrolyte played an important role in the high rate discharge performance when the discharge rate was higher than 10.0 C.With these factors optimized combination,a polymer Li-ion battery was developed with the maximum discharge rate up to 20.0 C.The 10.0 C discharge capacity retained 84% of the initial discharge capacity after 300 cycles.