Electrochemical characterization of AlPO4 coated LiNi1/3Co1/3Mn1/3O2 cathode materials for high temperature lithium battery application

• Published in: Rare metals Vol. 40; no. 1; pp. 78 - 83
• Main Authors: Wang, Jian-Hua, Wang, Yu, Guo, Yu-Zhong, Liu, Chang-Wei, Dan, Lu-Lu
• Format: Journal Article
• Language: English
• Published: Beijing Nonferrous Metals Society of China 2021
• Subjects: Biomaterials; Chemistry and Materials Science; Energy; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Physical Chemistry; Lithium battery; Surface; Electrochemical
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-014-0247-x

Aluminum phosphate (AlPO 4 ) was used to modify the surface of LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM) cathode material. The surface structure and electrochemical properties of the coated materials were investigated by X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The results confirm the formation of aluminum-containing solid solution on the surface of NCM particles. An aluminum phosphate coating blocks the Li + insertion-extraction process in cells charged at high rates at room temperature, increasing surface film resistance and decreasing discharge capacity. However, an aluminum phosphate aids the formation of a stable solid electrolyte interface film on NCM surface and stabilizes the R ct of cell as samples electrochemically cycled at 55 °C. The electrochemical studies suggest that the initial columbic efficiency is significantly enhanced. An NCM sample coated with 1.0 wt% AlPO 4 delivers a higher discharge capacity and shows excellent capacity retention ability.