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Restoration of Degraded Nickel‐Rich Cathode Materials for Long‐Life Lithium‐Ion Batteries
Author(s) -
Wu Naiteng,
Wu Hao,
Kim JangKyo,
Liu Xianming,
Zhang Yun
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700979
Subject(s) - disproportionation , materials science , nickel , electrochemistry , cathode , degradation (telecommunications) , chemical engineering , lithium (medication) , coating , metallurgy , inorganic chemistry , nanotechnology , chemistry , electrode , catalysis , medicine , telecommunications , biochemistry , computer science , engineering , endocrinology
The sensitive surface of nickel‐rich layered oxides often suffers from the erosion of CO 2 and H 2 O in air. The results of erosion, including formation of impurities such as Li 2 CO 3 and LiOH, degradation of layered structures and disproportionation of trivalent nickel, would cause cation mixing and structural instability. In order to overcome these inherent drawbacks, we present a targeted solvothermal followed by re‐oxidation approach to restore the structural stability and electrochemical performances of degraded Ni‐rich layered cathode materials. Owing to this unique approach, the resultant LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) demonstrate improved layered structure, a stable nanoscale coating shell and enhanced surface stability. The revived NCA enables higher reversible capacity and longer cycle life than that of degraded NCA. Specifically, the restored NCA can retain 82 % initial capacity after 200 cycles under 1 C at room temperature, and 87 % and 55 % initial capacity after 100 and 500 cycles under 1 C at 55 °C, respectively. This approach could be applied to improve the structural stability and electrochemical properties of degraded Ni‐rich layered oxides and suggests great potential in industrial applications.