Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7993941 | Journal of Alloys and Compounds | 2018 | 10 Pages |
Abstract
High-powered, LiAlO2 homogeneously coated LiNi0.90Co0.07Al0.03O2 (ACLNCAO) has been successfully synthesized by using a novel technique. A new design of Al(OH)3 precipitation is applied via CO2 decomposition of NaAl(OH)4 solution, a classical method has been used in aluminium oxide metallurgy, which enables to plant Al(OH)3 on Ni0.928Co0.072 (OH)2 precursors uniformly and efficiently. Experimental results from structure, morphology and composition analysis technologies demonstrate that an Al(OH)3 layer is uniformly coated on the nickel-cobalt hydroxide precursor, and a γ-LiAlO2 shell coated on the Ni-based cathode material. The Li+ storage properties of as-prepared samples are characterized by electrochemical tests, transmission electron microscope (TEM) differential scanning calorimetry (DSC) and metallic nail penetration tests. The γ-LiAlO2 modified material displays a high discharge capacity of â¼224 mAh gâ1 at 0.2C and 205.8 mAh gâ1 at 1C rate at 25 °C and shows good capacity retention of 93.4% after 100 cycles, which is better than Al homogeneously doped LiNi0.90Co0.07Al0.03O2 (HLNCAO). Furthermore, ACLNCAO shows an upgraded thermal stability, which benefit from the LiAlO2 based surface prevent the high powered core from being attacked by electrolyte under high voltage state.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Jianguo Duan, Peng Dong, Ding Wang, Xue Li, Zhengwei Xiao, Yingjie Zhang, Guorong Hu,