(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要:
關(guān)鍵字: LiFePO4；鋰離子電池；正極材料；鎂摻雜
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:LiFe1−xMgxPO4(x = 0, 0.01, 0.05, 0.10 and 0.20) cathode materials were synthesized by one-step solid-state reaction combined a dry high-energy ball milling. The crystalline structure, morphology and Mg distribution were characterized by XRD, SEM and EDS. The effect of amount of doped-Mg on the electrochemical properties of LiFe1−xMgxPO4 was investigated. The results show that the prepared LiFe1−xMgxPO4 (0≤x≤0.10) is pure, and with the increasing of x value, the crystalline size of LiFe1−xMgxPO4 (x=0, 0.01, 0.05, 0.10 and 0.20) increases. LiFe0.99Mg0.01PO4 sample has higher charge and discharge capacities than other samples。The initial discharge specific capacity of LiFe0.99Mg0.01PO4 is 150.8 mA∙h/g at 0.1 C and ambient temperature, 129.9 mA∙h/g at 1C, showing that it has good cycling behavior.
Key words: LiFePO4; lithium-ion battery; cathode materials; Mg doping
