通过多巴胺聚合辅助杂化石墨烯涂层提高用于先进锂离子电池的SiO的循环性能和倍率性能
Boosting Cyclability and Rate Capability of SiO via Dopamine Polymerization-Assisted Hybrid Graphene Coating for Advanced Lithium-Ion Batteries.
作者信息
Gu Haitao, Wang Yong, Zeng Yun, Yu Meng, Liu Tong, Chen Jian, Wang Ke, Xie Jingying, Li Linsen
机构信息
State Key Laboratory of Space Power-Sources Technology, Shanghai Institute of Space Power-Sources, Shanghai 200245, China.
Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China.
出版信息
ACS Appl Mater Interfaces. 2022 Apr 20;14(15):17388-17395. doi: 10.1021/acsami.2c01587. Epub 2022 Apr 6.
SiO suffers from the 200% volume change during cycling and low electronic conductivity, resulting in poor cyclability and rate capability as a lithium-ion battery anode. Herein, we demonstrate a dopamine polymerization-guided carbon coating for SiO anodes (SiO@PDA@GNH). SiO@PDA@GNH delivers charge capacities of 1269 and 1140 mA h·g at charge rates of 0.05 and 3 C, respectively, and a capacity retention of 79.60% after 150 cycles at 1 C. A full cell with LiNiCoMnO or cathode demonstrates a capacity retention of >80% after 100 cycles at the rate of 0.33 C with an area capacity over 3.2 mA h·cm. Suppressed crack and overgrowth of the SEI layer are the key contributions for the improved performance. These results enlighten a practical pathway for the designing and modifications of SiO anodes for high energy density lithium-ion batteries.
作为锂离子电池负极，SiO在循环过程中存在200%的体积变化且电子电导率低，导致循环性能和倍率性能较差。在此，我们展示了一种用于SiO负极的多巴胺聚合引导碳涂层（SiO@PDA@GNH）。SiO@PDA@GNH在0.05 C和3 C的充电速率下分别提供1269和1140 mA h·g的充电容量，在1 C下循环150次后容量保持率为79.60%。与LiNiCoMnO或正极组成的全电池在0.33 C的速率下循环100次后容量保持率>80%，面积容量超过3.2 mA h·cm。抑制SEI层的裂纹和过度生长是性能改善的关键因素。这些结果为设计和改性用于高能量密度锂离子电池的SiO负极开辟了一条实用途径。
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