Influence of Mn2+ and Ti4+ doping on the electrochemical property of Li2FeSiO4/C
Liu Ping, Gong Yong, Li Lin, Dai Zuyang, Gu Qilong, Cheng Wei, Chen Jian
School of Materials Science and Engineering,Sichuan University of Science & Engineering,Sichuan Province Key Laboratory for Corrosion and Protection of Material,Sichuan University of Science & Engineering,Zigong 643000
Abstract: The sol-gel method was used to synthesize lithium iron silicate (Li2FeSiO4/C) cathode nanocomposite in order to overcome the shortcomings of Li2FeSiO4 low conductivity and low lithium ion diffusion rate in the lithium ion battery.The structural,morphological and electrochemical properties of Li2FeSiO4/C were characterized by XRD,SEM and electrochemical methods.The results showed that the charge/discharge capacitance increased gradually as increasing the Mn2+ substitution concentration x,and the maximum of charge/discharge capacitance was 172.9mAh/g(152.1mAh/g) at x=0.15.When the Mn2+ substitution amount x=0.20,the charge/discharge capacitance drop to 118.5mAh/g(110.9mAh/g).For Ti2+ doping,the best condition was Li2Fe0.85Mn0.15SiO4.It was found that LiFe0.80Mn0.15Ti0.05TiO4(y=0.05) had the maximum charge/discharge capacitance of 178.2mAh/g(166.7mAh/g),and the capacitance retention rate was 96.4% after 20 cycles of 0.1C magnification.
刘平, 龚勇, 李琳, 代祖洋, 辜其隆, 程伟, 陈建. Mn2+、Ti4+掺杂对Li2FeSiO4/C正极材料电化学性能的影响[J]. 化工新型材料, 2019, 47(6): 126-130.
Liu Ping, Gong Yong, Li Lin, Dai Zuyang, Gu Qilong, Cheng Wei, Chen Jian. Influence of Mn2+ and Ti4+ doping on the electrochemical property of Li2FeSiO4/C. New Chemical Materials, 2019, 47(6): 126-130.
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