State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Meilong Rd, Shanghai, 200237, P.R. China.
Department of Chemical and Environmental Engineering, University of California, Riverside, 900 University Ave, Riverside, CA, 92521, USA.
Angew Chem Int Ed Engl. 2017 Aug 28;56(36):10780-10785. doi: 10.1002/anie.201705200. Epub 2017 Jul 31.
We report colloidal routes to synthesize silicon@carbon composites for the first time. Surface-functionalized Si nanoparticles (SiNPs) dissolved in styrene and hexadecane are used as the dispersed phase in oil-in-water emulsions, from which yolk-shell and dual-shell hollow SiNPs@C composites are produced via polymerization and subsequent carbonization. As anode materials for Li-ion batteries, the SiNPs@C composites demonstrate excellent cycling stability and rate performance, which is ascribed to the uniform distribution of SiNPs within the carbon hosts. The Li-ion anodes composed of 46 wt % of dual-shell SiNPs@C, 46 wt % of graphite, 5 wt % of acetylene black, and 3 wt % of carboxymethyl cellulose with an areal loading higher than 3 mg cm achieve an overall specific capacity higher than 600 mAh g , which is an improvement of more than 100 % compared to the pure graphite anode. These new colloidal routes present a promising general method to produce viable Si-C composites for Li-ion batteries.
我们首次报道了一种通过胶体途径合成硅@碳复合材料的方法。将表面功能化的硅纳米颗粒（SiNPs）溶解在苯乙烯和十六烷中，作为油包水乳液中的分散相，通过聚合和随后的碳化，制备出蛋黄壳和双壳中空 SiNPs@C 复合材料。作为锂离子电池的阳极材料，SiNPs@C 复合材料表现出优异的循环稳定性和倍率性能，这归因于 SiNPs 在碳载体中的均匀分布。由 46wt%的双壳 SiNPs@C、46wt%的石墨、5wt%的乙炔黑和 3wt%的羧甲基纤维素组成的锂离子阳极，面载量高于 3mg cm，总比容量高于 600mAh g，与纯石墨阳极相比，提高了 100%以上。这些新的胶体途径为锂离子电池提供了一种很有前途的通用方法来制备可行的 Si-C 复合材料。
