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Synthesis of Alumina‐Coated Natural Graphite for Highly Cycling Stability and Safety of Li‐Ion Batteries
Author(s) -
Xu Tao,
Zhou Chengkun,
Zhou Haihui,
Wang Zekun,
Ren Jianguo
Publication year - 2019
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201800559
Subject(s) - chemistry , anode , graphite , electrolyte , coating , penetration (warfare) , thermal stability , aluminium , temperature cycling , cycling , composite material , ion , chemical engineering , ceramic , thermal , materials science , electrode , organic chemistry , archaeology , engineering , history , physics , operations research , meteorology
Summary of main observation and conclusion The natural graphite (NG) uniformly coated with alumina ceramics (Al 2 O 3 ) was successfully synthesized through sol‐gel method. The aluminum plastic film soft‐packed battery prepared using Al 2 O 3 ‐coated NG as anode material exhibits excellent cycle performance and safety performance. The cycling retention of AN‐1 is 84.95% after 200 cycles at a rate of 1 C in a potential window ranging from 3.0 to 4.35 V, which is much greater than 75.07% of NG under the same test conditions. The result of the nail penetration tests shows that the successful nail penetration rate of the NG used as anode is 0%, while that of Al 2 O 3 coated samples AN‐1 is 100%. The test results show that the Al 2 O 3 coating could act as a solid electrolyte to suppress side reactions, improve cycle stability, and prevent a thermal runaway under mechanical abuse.
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