Journal
NANO RESEARCH
Volume 15, Issue 7, Pages 6168-6175Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-4264-z
Keywords
three-dimensional carbon framework; silicon; silicon-carbon; anode; lithium-ion battery
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Funding
- National Key Research and Development Program of China [2017YFB0307701]
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In this work, a silicon carbon composite material (Si@3DC) was prepared by anchoring silicon nanoparticles on a three-dimensional carbon framework through carbon films. Si@3DC possesses a three-dimensional carbon framework with multiple hierarchical pores, which is compatible with the high-pressure calendering process and provides expansion space during lithiation process.
Si materials are widely considered to be the next-generation anode to replace the current commercial graphite-based anode due to its high energy density. However, the large volume variation of silicon during (de)lithiation process leads to rapid capacity decay, hindering its commercial application. Although the various hollow structure designs of Si nanomaterials have improved their cycling stability in the laboratory, the high-pressure calendering process in the current industrial electrode preparation process might collapse the hollow structure and weaken the structural advantages of hollow silicon anode materials. In this work, a silicon carbon composite material (Si@3DC) in which Si nanoparticles were anchored on a three-dimensional carbon framework through carbon films was prepared by a simple proton exchange method. The three-dimensional carbon framework with multiple hierarchical pores of Si@3DC was compatible with the high-pressure calendering process, but also could provide expansion space for Si nanoparticles during the lithiation process, and ensure good electronic and ionic conductivity. The carbon film on the surface of Si nanoparticles promoted the formation of stable solid electrolyte interphase (SEI) films, ensuring the good cycle stability of Si@3DC.
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