Three-dimensional spongy nanographene-functionalized silicon anodes for lithium ion batteries with superior cycling stability
Three-dimensional spongy nanographene-functionalized silicon anodes for lithium ion batteries with superior cycling stability作者机构:Department of Energy Systems Engineering DGIST Daegu 42988 Republic of Korea
出 版 物:《Nano Research》 (纳米研究(英文版))
年 卷 期:2018年第11卷第1期
页 面:233-245页
核心收录:
学科分类:0831[工学-生物医学工程(可授工学、理学、医学学位)] 0711[理学-系统科学] 0808[工学-电气工程] 07[理学] 08[工学]
基 金:supported by Global Frontier R&D program on Center for Multiscale Energy System funded by the Korea government
主 题:spongy nanographene core-shell silicon lithium ion battery three-dimensionalstructure
摘 要:An innovative spongy nanographene (SG) shell for a silicon substrate was prepared by low-temperature chemical vapor deposition on a hierarchical nickel nanotemplate. The SG-functionalized silicon (Si@SG) composite shows outstanding properties, which may be helpful to overcome issues affecting current silicon anodes used in lithium ion batteries such as poor conductivity, large volume expansion and high mass transfer resistance. The hierarchical nanographene shell exhibits elastic, sponge-like features that allow it to self-adaptively change its volume to accommodate the volume expansion of silicon. In addition, the porous, spongy framework containing randomly stacked graphene nanosheets presents low diffusion barriers and provides sufficiently free and short-haul channel segments to allow the fast migration of Li and electrolyte ions. The unique properties of the present silicon anode result in excellent electrochemical performances in terms of long-term cycling stability (95% capacity retention after 510 cycles), rate performance, and cycling behavior for high mass loadings at different current densities.