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Silicon/Mesoporous Carbon/Crystalline TiO 2 Nanoparticles for Highly Stable Lithium Storage

2016; American Chemical Society; Volume: 10; Issue: 11 Linguagem: Inglês

10.1021/acsnano.6b06517

1936-086X

Wei Luo, Yunxiao Wang, Lianjun Wang, Wan Jiang, Shulei Chou, Shi Xue Dou, Huan Liu, Jianping Yang,

Supercapacitor Materials and Fabrication

A core–shell–shell heterostructure of Si nanoparticles as the core with mesoporous carbon and crystalline TiO2 as the double shells (Si@C@TiO2) is utilized as an anode material for lithium-ion batteries, which could successfully tackle the vital setbacks of Si anode materials, in terms of intrinsic low conductivity, unstable solid–electrolyte interphase (SEI) films, and serious volume variations. Combined with the high theoretical capacity of the Si core (4200 mA h g–1), the double shells can perfectly avoid direct contact of Si with electrolyte, leading to stable SEI films and enhanced Coulombic efficiency. On the other hand, the carbon inner shell is effective at improving the overall conductivity of the Si-based electrode; the TiO2 outer shell is expected to serve as a rigid layer to achieve high structural stability and integrity of the core–shell–shell structure. As a result, the elaborate Si@C@TiO2 core–shell–shell nanoparticles are proven to show excellent Li storage properties. It delivers high reversible capacity of 1726 mA h g–1 over 100 cycles, with outstanding cyclability of 1010 mA h g–1 even after 710 cycles.