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[Li Tao,Li Meng,Zhang Li-jiu,Li Sheng-chen and Li Na.Preparation and Electrochemical Performance Characteri-zation of Si/Graphite/Disordered-Carbon Composite Anode for Lithium-Ion Batteries[J].Rare Metal Materials and Engineering,2022,51(8):2802~2809.]
Preparation and Electrochemical Performance Characteri-zation of Si/Graphite/Disordered-Carbon Composite Anode for Lithium-Ion Batteries
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Received:July 16, 2021  Revised:July 17, 2022
DOI:
Key words: lithium-ion battery  silicon  Si/graphite/disorded-carbon composite  anode
Foundation item:The National Test and Evaluation Platform for Advanced Materi-als-Primary Center Project (TC170A5SU) and-Nation-al test and evaluation platform for advanced materials- Nonferrous metals center Pro-ject(TC190H3ZW/2)
Author NameAffiliation
Li Tao,Li Meng,Zhang Li-jiu,Li Sheng-chen and Li Na  
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Abstract:
      An optimized structure of the Si/graphite/disorded-carbon (Si/G/DC) composites was proposed and prepared to improve the cycling performance by ultra-fine grinding of elemental mixtures of nano-silicon, graphite and sucrose followed by thermal treatment. The morphology, electrochemical performance, cycling stability and optimization of silicon content of Si/G/DC composites were investigated. Results show that the use of nano-silicon materials loaded on graphite carbon matrix can effectively improve the electrochemical performance of anode materials combined with high-temperature pyrolysis technology. With graphite as buffer matrix and conductive network and amorphous carbon coating, the Si/G/DC composite shows excellent electrochemical performance. The amorphous carbon coating in the Si/G/DC composite can apparently reduce the possibility of contact loss between silicon and electrolyte, and help to maintain the mechanical stability by relieving stresses resulting from silicon volume change.