| Abstract: | The natural graphite (NG) uniformly coated with alumina ceramics (Al2O3) was successfully synthesized through sol‐gel method. The aluminum plastic film soft‐packed battery prepared using Al2O3‐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 Al2O3 coated samples AN‐1 is 100%. The test results show that the Al2O3 coating could act as a solid electrolyte to suppress side reactions, improve cycle stability, and prevent a thermal runaway under mechanical abuse. |
