聚丙烯酸对锂离子电池正极材料LiNi1/3 Co1/3 Mn1/3 O2结构与性能的影响

摘要

采用溶胶-凝胶法,以聚丙烯酸为络合剂制备纳米尺寸的锂离子电池 LiNi1/3 Co1/3 Mn1/3 O2正极材料。考察了聚丙烯酸与阳离子配比和烧结温度对产物LiNi1/3 Co1/3 Mn1/3 O2结构与电化学性能的影响。结果表明,烧结温度700℃可制备出晶体发育完整,粒径为80nm,分布均匀的α-NaFeO2层状结构的LiNi1/3 Co1/3 Mn1/3 O2。当聚丙烯酸与金属阳离子摩尔比值为0.75,首次放电比容量达到169.2mAh/g,30次循环后容量保持率为89.3%。%Nanocrystalline LiNi1/3 Co1/3 Mn1/3 O2 cathode materials were synthesized by sol-gel method using polyacrylic acid (PAA)as a chelating agent.The effects of the molar ratio of PAA to total metal ions and calcination temperature on the structure and electrochemical performance of the LiNi1/3 Co1/3 Mn1/3 O2 electrode materials were investigated.The results showed that the well-distributed LiNi1/3 Co1/3 Mn1/3 O2 with lamellar structure was obtained at a calcination tem-perature of 700℃.The crystal developed completely and the grain size of the LiNi1/3 Co1/3 Mn1/3 O2 particle was about 80nm.The initial discharge capacity of 169.2mAh/g was obtained while the molar ratio of PAA to total metal ions 0.75,and the discharge capacity retention ratio was 89.3% after 30 cycles.