Electrochemical scissoring of disordered silicon-carbon composites for high-performance lithium storage
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- Electrochemical scissoring of disordered silicon-carbon composites for high-performance lithium storage
- Ryu, Jaegeon; Bok, Taesoo; Joo, Se Hun; Yoo, Seokkeun; Song, Gyujin; Kim, Su Hwan; Choi, Sungho; Jeong, Hu Young; Kim, Min Gyu; Kang, Seok Ju; Wang, Chongmin; Kwak, Sang Kyu; Park, Soojin
- Issue Date
- Elsevier BV
- ENERGY STORAGE MATERIALS, v.36, pp.139 - 146
- Practically adapted physical integration of silicon and carbon predominates as a viable solution to realize high energy density batteries, however, the composite structure is vulnerable to fracture. Here we report a molecular-level mixed silicon-carbon composite anode through thermal pyrolysis of silane and subsequent mechanical mill, entailed by electrochemical dissociation and reclustering of such disordered silicon-carbon bonds during the cycles. Lithium insertion induces heterolytic fission of the bonds into sub-nanometre silicon particles segregated by redox-active carbon framework validated by microscopy analysis and reactive molecular dynamics simulation. The embedded structure with a high packing density of silicon prevents detrimental electrochemical coalescence and direct contact to a liquid electrolyte to stabilize the interfaces, while three-dimensional (3D) carbon framework buffers large volume expansion of silicon to enable an extended full battery cycling.
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