期刊
SUSTAINABLE MATERIALS AND TECHNOLOGIES
卷 27, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.susmat.2020.e00238
关键词
Silicon anode; Carbon; Vacuum distillation; High graphitization; Lithium-ion batteries
资金
- State Key Programof National Natural Science of China [61633015]
- Discipline Construction of HighLevel Talents of Shandong University [31370089963078]
- Shenzhen Fundamental Research Program [JCYJ20190807093405503]
- Taishan Scholars Program of Shandong Province [tsqn201812002, ts20190908, ts201511004]
- National Natural Science Foundation of China [51972198]
- Young Scholars Programof Shandong University [2016WLJH03]
The study synthesized uniform porous Si@C using a green vacuum distillation method, which improved electrical conductivity and ability to accommodate volume changes of the silicon anode, while maintaining stable battery performance. Due to its unique structure, pSi@C exhibited superior rate capability and stable cycling performance.
Silicon (Si) is considered as one of the most promising anodes for lithium-ion batteries (LIBs). However, rapid capacity decay caused by huge volume change and low electrical conductivity limit its further development. Herein, uniform porous Si@C (pSi@C) from commercial Mg2Si alloy and pitch is synthesized by green vacuum distillation method. During this process, the low boiling-point Mg is evaporated and cycled to form porous Si. Besides, the high-graphitization C layer is obtained because the metallic Mg favors the graphitization degree of C. Asa result, the carbon coating layer and unique porous structure can improve electrical conductivity and accommodate volume change of Si anode without destroying solid electrolyte interface. The optimal pSi@C shows improved lithium storage with stable cyclability and superior rate capability. (C) 2020 Elsevier B.V. All rights reserved.
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