Synthesis And Electrochemical Performance Of Cathode Material LiFePO₄for Lithium-ion Batteries

The lithium-ion batteries because of their excellent performance, and develop very quickly.It has a high working voltage, high energy density, low self discharge rate, cyclical, long cyclinglife, light weight, small size, and other prominent advantages. Lithium-ion batteries is widely usledin portable electronic devices, electric vehicles, aerospace equipment technology, defense industryand other fields. The lithium-ion battery cathode material is an important factor restricting thedevelopment of lithium-ion battery. The lithium iron phosphate cathode material because of itshigh security, low price of iron source, the cycle performance, and good on the environment, so itis considered the most promising cathode materials.LiFePO4materials were prepared by solid-state method use Li₂CO₃、FeC₂O₄·2H₂O�'�（NH₄）H₂PO₄.The staring materials were mixed by ball milling. The specific research contents areas follows:According to the stoichiometric ratio （0.5:1:1） Li₂CO₃, FeC₂O₄·2H₂O,（NH₄） H₂PO₄,respectively adding certain content （about5%,10%,15%） of glucose as a carbon source （withdifferent ratio of sucrose） in a tube furnace under protection in Ar roasting, get LiFePO4/composite material. Performance test is conducted and structure characterization.According to the non-stoichiometric ratio （0.5:0.9:0.95） Li₂CO₃, FeC₂O₄·2H₂O （NH₄）,H₂PO₄, without glucose and adding certain content （about15%） of glucose as a carbon source ina tube furnace under protection in Ar roasting, get theLiFe_0.9P_0.95O_4-δ/C composites.Performance test is conducted and structure characterization.LIB cathode material of LiFePO4prepared by solid state reaction is characterized by XRD, IR,constant current charge-discharge after soaking in water for96h.