The Nonstoichiometry Compounds Of Limn <sub> 1-x </ Sub> M <sub> X </ Sub> O <sub> 2-y </ Sub> F <sub> Y-</ Sub> Of The Solid Phase Synthesis And Its Electrochemical Performance Test

On the base of reviewing the development of lithium ion battery and its cathode materials in detail, layered LiMnO₂ were chosen and their synthesis and modification procedures were studied.Lithium hydroxide, manganese oxalate and molybdenum trioxide were used as raw materials, LiMno.9Moo.1O2 were synthesized by solid state synthesis method at high temperature. At C/10 rate, the fist charge capacity was 160 mAh.g^-1, and the fist discharge capacity was 158 mAh.g^-1 at 25℃(vs Li metal, voltage window 2.0⁴.3V), and the last charge and discharge capacities were 156 mAh.g^-1 and 155 mAh.g^-1. Its stability of cycling scanning and charge-discharge was very choiceness, and the size of crystal were tuniformity.LiMn₀.85Cr₀.15O₂ was synthesized with lithium hydroxide, electrolyte manganese dioxide, chromium trioxide by solid state synthesis method at high temperature. At C/10 rate, the fist charge capacity was 149 mAh.g^-1, and the fist discharge capacity was 150 mAh.g^-1 at 25℃(vs Li metal, voltage window 2.0⁴.3V), and the last charge and discharge capacities were 148 mAh.g^-1 and 148 mAh.g^-1. And its efficiency of charge-discharge was very high. Its stability of cycling scanning and charge-discharge was very choiceness.LiMn₀.85Cr₀.15O₁.95F₀.05 was synthesized with lithium hydroxide, electrolyte manganese dioxide, chromium trioxide, carbon, lithium fluoride by solid state synthesis method at middle temperature. At C/18 rate, the fist charge capacity was 168 mAh.g^-1, and the fist discharge capacity was 210 mAh.g^-1 at 25℃(vs Li metal, voltage window 2.0⁴.3V), and the last charge and discharge capacities were 186 mAh.g^-1 and 163mAh.g^-1. At C/9 rate, the fist charge capacity was 194 mAh.g^-1, and the fist discharge capacity was 174 mAh.g^-1 at 55℃(vs Li metal, voltage window 2.0⁴.3V), and the last charge and discharge capacities were 193 mAh.g^-1 and 151 mAh.g^-1. Its capacity of charge-discharge was very high, and its stability of cycling scanning and charge-discharge was very choiceness. Its components were mostly o-LiMnO₂ compound by XRD.The stability of cycling scanning and charge-discharge are improved dopingCr3+ separately. The stability of cycling scanning and charge-discharge and its capacity are improved simultaneity doping Cr3+ and F".