摘要
以水和乙二醇作溶剂,采用溶剂热法合成不同Mn掺杂量的LiFePO_(4)正极材料,并对其物相、形貌和电化学性能进行研究。结果表明,Mn在LiFePO_(4)正极材料中存在积极作用,Mn的掺杂可以提高LiFePO_(4)的电化学性能。一方面,少量Mn的掺杂可以拓宽锂离子扩散通道,减小电荷转移阻抗。但另一方面,当Mn的掺杂量过多时,其自身较差的动力学性质会导致电荷转移受阻,造成电池极化和严重的容量衰减。
LiFePO_(4) cathode materials with different doping amounts of Mn were synthesized by solvothermal using water and ethylene glycol as solvent.The crystal phase,morphology and electrochemical performance were studied.The results show that Mn has a positive effect in LiFePO_(4) cathode material,and the Mn-doping can improve the electrochemical performance of LiFePO_(4).On the one hand,a small amount of Mn-doping can broaden the lithium ion diffusion channel and reduce the charge transfer resistance.On the other hand,when the doped amount of Mn was too much,its own poor kinetic properties will cause the charge transfer to be blocked,resulting in battery polarization and serious capacity attenuation.
作者
吴星宇
阮丁山
毛林林
冯茂华
李斌
WU Xing-Yu;RUAN Ding-Shan;MAO Lin-Lin;FENG Mao-Hua;LI Bin(Guangdong Brunp Recycling Technology Co.,Ltd.,Foshan,Guangdong 528100,China;Guangdong Provincial Key Laboratory of Battery Recycling,Foshan,Guangdong 528100,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2021年第8期1399-1406,共8页
Chinese Journal of Inorganic Chemistry
基金
三水工业园区重大技术攻关项目资助。
关键词
正极材料
磷酸铁锂
溶剂热法
掺杂改性
cathode material
LiFePO_(4)
solvothermal method
doping modification
