Visualizing the roles of graphene for excellent lithium storage

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	Visualizing the roles of graphene for excellent lithium storage
	X. Y. Shan; G. M. Zhou; L. C. Yin; W. J. Yu; F. Li; H. M. Cheng
	2014
发表期刊	Journal of Materials Chemistry A
ISSN	2050-7488
卷号	2 期号:42 页码:17808-17814
摘要	Graphene has been extensively used in hybrid electrodes for its notable improvement of lithium storage properties. However, direct visualization of the roles of graphene and the origin for the enhancement at the nanoscale are highly inadequate, which are difficult to be obtained by ex situ methods. Here, we use in situ transmission electron microscopy to visualize the roles of graphene during lithiation using a NiO/graphene hybrid as a model material. We witness that graphene has three roles in a strong-coupled NiO/graphene hybrid: (1) it increases the Li+ diffusion rate by two orders of magnitude; (2) it strongly improves Li+ reaction kinetics with NiO at high current densities and facilitates the homogeneous lithiation of NiO; (3) it severely restricts the expansion of NiO near the interface, ensuring stable electrical contact between graphene and NiO during extended cycling. Combined with the electrochemical measurements and first-principles calculations, this study further verifies the interface-induced graphene enhancement and distinctly provides valuable insights for excellent lithium storage by constructing interfacial binding between graphene and active materials to make full use of graphene.
部门归属	[shan, xu-yi ; zhou, guangmin ; yin, li-chang ; yu, wan-jing ; li, feng ; cheng, hui-ming] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; li, f (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china. ; fli@imr.ac.cn ; cheng@imr.ac.cn
关键词	Transmission Electron-microscopy Li-ion Batteries Performance Anode Materials In-situ Energy-storage Electrochemical Lithiation Conversion Mechanism Hollow Microspheres Delithiation Capacity
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73364
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Y. Shan,G. M. Zhou,L. C. Yin,et al. Visualizing the roles of graphene for excellent lithium storage[J]. Journal of Materials Chemistry A,2014,2(42):17808-17814.
APA	X. Y. Shan,G. M. Zhou,L. C. Yin,W. J. Yu,F. Li,&H. M. Cheng.(2014).Visualizing the roles of graphene for excellent lithium storage.Journal of Materials Chemistry A,2(42),17808-17814.
MLA	X. Y. Shan,et al."Visualizing the roles of graphene for excellent lithium storage".Journal of Materials Chemistry A 2.42(2014):17808-17814.