LiMn0.6Fe0.4PO4掺碳改性的研究

采用高温固相法,制备了锂离子电池用的纯LiMno0.6Fe0.4PO4和LiMn0.6Fe0.4PO4/C复合正极材料.利用酸溶解法、XRD、扫描电镜及充放电测试等,对样品的碳含量、晶体结构、形貌以及电性能等进行了研究.所得LiMn0.6Fe0.4PO4和LiMn0.6Fe0.4P04/C均为纯橄榄石型晶体结构,其中以蔗糖为碳添加剂的LiMn0.6Fe0.4PO4/C复合材料具有良好的循环性能和高倍率性能:以0.1C充放电,首次放电比容量为122.3 mAh/g,循环15次之后,容量保持率为99.3%;以0.5 C和1.5 C充放电,首次放电比容量分别为121.4 mAh/g和110.2 mAh/g.

Study on the modification of LiMn0.6Fe0.4PO4 with carbon doping

The pure LiMn0.6Fe0.4PO4 and LiMn0.6Fe0.4PO4/C composite cathode materials for Li-ion battery were prepared by high temperature solid-state reaction method,the content of carbon,crystal structure,morphology and electrical performance of the samples were investigated by dissolving in acid,XRD,scanning electron microscopy and charge-discharge test.The obtained LiMn0.6Fe0.4PO4 and LiMn0.6Fe0.4PO4/C were pure olivine-type crystal structure,LiMn0.6Fe0.4PO4/C composite material with the sucrose as carbon doping material had fine cycle performance and high rate performance.Its initial discharge specific capacity was 122.3 mAh/g and the capacity retention was 99.3% after 15 cycles when charge-discharge at 0.1 C;when charge-discharge at 0.5 C and 1.5 C,its initial discharge specific capacity was 121.4 mAh/g and 110.2 mAh/g,respectively.