Synthesis and electrochemical properties of olivine LiFePO4 as a cathode material prepared by mechanical alloying

摘要: Abstract Pure olivine LiFePO4 and LiFePO4/C composite powders are synthesized by using mechanical alloying (MA) subsequent firing. The powder properties the electrochemical characteristics of prepared samples investigated in comparison with those a sample obtained conventional solid-state reaction. MA shows maximum discharge capacity 135 mA h g−1 at C/20 rate (8.5 mA g−1) when fired relatively low temperature 600 °C. A compound process under optimum firing conditions has high 156 mA h g−1 rate, i.e. 92% theoretical capacity. also displays better capability, higher charge–discharge more stable cycle-life than produced method. improved electrode performance originates mainly from very fine particles sub-micron size rough surface morphology. These increases area maximizes contact conductor additive, which results enhanced electronic conductivity. Consequently, technique offers promising synthetic to overcome disadvantages olivine-type cathode materials for rechargeable lithium batteries.