关键词: 锂离子电池, 正极材料, 磷酸铁锂, 镁离子掺杂

Abstract: In order to improve the electrochemical performance of LiFePO4,LiMg0.1Fe0.9PO4/C cathode material was synthesized for lithium ion batteries by high temperature solid-state reaction,using Li2CO3,FeC2O4•2H2O,(MgCO3)4•Mg(OH)2•5H2O,(NH4)2HPO4 as raw materials and glucose as carbon source.Crystal structure,surface morphology,charge/discharge performance,and cycle stability were investigated by using X-ray diffraction,scanning electron microscope,and electrochemical measurement,respectively.Results indicated that LiMg0.1Fe0.9PO4/C composite was a single olivine structure with 200~500 nm particle size and exhibited an excellent electrochemical performance and an enhanced cycle stability;the electroconductibility of LiFePO4 were improved by doping Mg2+ and the discharge specific capacity was 142.4 mA•h/g at 0.1C after 10 cycles. 

Key words: lithium ion battery, cathode materials, LiFePO4, Mg2+ doping