Enhanced high temperature performance of LiMn2O4 coated with Li3BO3 solid electrolyte

Bulletin of materials science

Wu Xianming²  Liu Jianben²  Chen Shang²  He Zeqiang²  Liu Jinlian¹ 

[1] College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China$$College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, ChinaCollege of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China$$;College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China$$Xiangxi Ores and New Materials Development and Service Centre, Jishou 416000, China$$College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, ChinaCollege of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China$$Xiangxi Ores and New Materials Development and Service Centre, Jishou 416000, China$$Xiangxi Ores and New Materials Development and Service Centre, Jishou 416000, ChinaCollege of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China$$Xiangxi Ores and New Materials Development and Service Centre, Jishou 416000, China$$

关键词: Lithium ion battery;    lithium manganese oxide;    coating;    solid-state method.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Cathode material, LiMn₂O₄, was synthesized by solid-state reaction followed by surface coating of Li₃BO₃ solid electrolyte. Structure and electrochemical performance of the prepared powders were characterized by X-ray diffraction, scanning electron microscopy, cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic chargeâ€�?�discharge techniques, respectively. Results show that Li₃BO₃ coated LiMn₂O₄ has similar X-ray diffraction patterns as LiMn₂O₄. The discharge specific capacities of LiMn₂O₄ coated with 0.1, 0.3 and 0.6 wt% Li₃BO₃ are 123.3, 118.2 and 110 mAh/g, respectively, which is slightly smaller than that of 124.4 mAh/g for LiMn₂O₄. However, the capacity retention of Li₃BO₃ coated LiMn₂O₄ is at least 5.6 and 7.6% higher than LiMn₂O₄ when cycled at room temperature and 55 °C, respectively. Li₃BO₃ coated LiMn₂O₄ shows much better cycling behaviours than LiMn₂O₄.

【 授权许可】

Unknown