溶剂热法合成锂离子电池正极材料-纳米LiFe1/3Mn1/3Co1/3PO4/C

首次报道了溶剂热法合成一种新型锂离子电池正极材料LiFe1/3Mn1/3Co1/3PO4，并对其结构和电化学性能进行了研究。合成的LiFe1/3Mn1/3Co1/3PO4属正交晶系结构，扫描电镜照片显示合成的材料是长度300～400nm，宽度200．250nm，厚度约100nm的板状结构。以碳包覆后的LiFe1/3Mn1/3Co1/3PO4作为正极材料组装电池进行充放电测试，在3．5V，4．1V，4．6V出现了三个平台，分别对应Fe^3＋／Fe^2＋，Mn^3＋／Mn^2＋,Co^3＋／Co^2＋氧化还原电对，0．2C时首次放电容量达到142．2mAh／g，经过50次循环后可逆容量仍保持在92．6mAh／g。

Solvothermal Synthesis of Nano - LiFe1/3 Mn1/3 Co1/3 PO4/C as Cathode Materials for Lithium Ion Battery

Nano -sized LiFe1/3Mn1/3 Co1/3PO4 solid solution was prepared via a solvothermal synthesis method in a in a water -ethylene glycol （EG） binary solvent as cathode materials for lithium ion batteries. The particles was crystallized in an orthorhombic structure, and showed a platelike shap with a length of 300 -400 nm, a breadth of 200 -250 nm, and a thickness of about 100 nm. With carbon coating, LiFe1/3 Mn1/3 Co1/3 PO4/C showed an initial discharge capacity of 142.2 mAh/g, and remains a reversible capacity of 92.6 mAh/g after 50 cyles at 0.2 C. During charge - discharge cycles, LiFe1/3 Mn1/3Co1/3PO4/C presented three plateaus corresponding to Fe^3＋/Fe^2＋ , Mn^3 ＋/Mn^2＋ , Co^3＋/Co^2＋ redox couples.