兴奋剂
材料科学
电化学
共沉淀
锂(药物)
煅烧
阴极
化学工程
溶解
杂质
无机化学
分析化学(期刊)
化学
电极
物理化学
光电子学
催化作用
医学
生物化学
工程类
内分泌学
有机化学
色谱法
作者
Bo Zong,Ziyao Deng,Shuhao Yan,Yaqiang Lang,Jiajia Gong,Jianling Guo,Li Wang,Guangchuan Liang
标识
DOI:10.1016/j.powtec.2020.02.033
摘要
LiNi0.5Mn1.5O4 spinels were prepared by coprecipitation-hydrothermal method followed by high-temperature calcination. Si doping was achieved by acetic acid glacial-assisted sol-gel method using TEOS as Si source. The effect of Si doping contents on the structure, morphology and electrochemical performance of LiNi0.5Mn1.5O4 material was investigated. Si doping can inhibit the formation of LixNi1-xO impurity, but excessive Si doping results in the appearance of Li2SiO3 secondary phase. Si doping can reduce particle size and improve distribution. Electrochemical tests show that Si doping has a positive impact on rate and cycling performances, due to the increased structural stability resulting from stronger SiO bond, and the enhanced Li+ ion diffusion coefficient. Post-mortem analysis shows that Si doping can mitigate the transition metal dissolution and side reactions, thus leading to the enhanced electrochemical performance of Si-doped samples. Among them, LiNi0.5Mn1.5O4 with 6% Si doping exhibits the optimal electrochemical performance.
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