Orthorhombic positive electrode material doped bismuth fluoride lithium ion battery and its preparation method

One kind of solid phase synthesis Co2 +, Cu2 + orthorhombic structure bismuth fluoride and a lithium ion battery positive electrode material doped preparation method, the method using fluorine anion to a quaternary ammonium salt as raw materials, by steric hindrance of bulky groups and by the action of specific auxiliary structure orthogonal synthesis solid phase direct bismuth fluoride, while improving material by doping Cu2 average discharge potential +, Co2 + doping by improving electron conductivity of the material, the bismuth fluoride as the lithium battery positive electrode material materials having more than 200mAh.g-1 specific capacity. This method requires low equipment, high product purity, can avoid the side reaction product bismuth complex fluoride salts in various solid phase reaction and has excellent electrochemical properties.