CAJ | 학술논문

通过碳热还原法制备了磷酸铁锂正极材料,并采用恒电位阶跃法测定了磷酸铁锂正极材料在不同电位和循环次数下的锂离子扩散系数,通过XRD对循环前后磷酸铁锂材料的晶体结构进行了表征,并对磷酸铁锂材料的失效模式进行了简单的分析。结果表明：LiFePO4在充放电过程中锂离子扩散系数随Li含量的增大,呈现先增大后略微降低的规律。随着充放电循环次数的增多,LiFePO4中Li＋的固相扩散系数值明显下降。
통과탄열환원법제비료린산철리정겁재료,병채용항전위계약법측정료린산철리정겁재료재불동전위화순배차수하적리리자확산계수,통과XRD대순배전후린산철리재료적정체결구진행료표정,병대린산철리재료적실효모식진행료간단적분석。결과표명：LiFePO4재충방전과정중리리자확산계수수Li함량적증대,정현선증대후략미강저적규률。수착충방전순배차수적증다,LiFePO4중Li＋적고상확산계수치명현하강。
LiFePO4 cathode materials was prepared by carbothermal reduction reaction.The potentiostatic intermittent titration technique（PSAC） was used to examinate the Li＋ion diffusion coefficient of LiFePO4 cathode materials at different voltage and at different charge/discharge cycles.The structure of LiFePO4 was studied before and after charge-discharge cycles by XRD technique.And preliminary failue anlysis of LiFePO4 was also conducted.The results indicated that the Li＋ diffusion coefficient may increse at first then reduced with the increase of Li＋ contents.The Li＋ diffusion coefficient reduced tendency with the increase of cycle number.