Three-dimensional VS4/graphene hierarchical architecture as high-capacity anode for lithium-ion batteries
Three-dimensional VS4/graphene hierarchical architecture as high-capacity anode for lithium-ion batteries
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DOI：
10.1016/j.jallcom.2016.05.293
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发表时间：
2016-11-15
影响因子：
6.2
通讯作者：
Zhang, Wanli
中科院分区：
文献类型：
--
作者：
Li, Qian;Chen, Yuanfu;Zhang, Wanli
基于石墨烯的三维分层结构是修饰锂离子电池低导电性正负极材料电化学性能的理想模板之一。本文采用一锅水热法合成了VS4颗粒均匀包裹在石墨烯纳米片上的三维VS4/还原氧化石墨烯(3DVG)层状结构。3DVG复合负极表现出优异的电化学性能：在0.2Ag(-1)下循环80次后，比容量达到1044.2 mAg(-1)(接近其理论容量1196mAg(-1))，循环80次后仍保持890.8 mAg(-1)；即使在4Ag(-1)下也有479.2 mAg(-1)的大容量。LIBS的3D复合材料的卓越性能归功于具有导电石墨烯互连网络的多孔3D结构，以确保石墨烯和VS4之间的高导电性和快速电子传输。此外，3DVG提供了分层模板来适应VS4颗粒在电化学循环期间的体积变化。3DVG被证明是一种高容量的LIBS负极材料。(C)2016爱思唯尔B.V.保留所有权利。
Graphene-based three-dimensional hierarchical architecture is one of the most desirable templates to modify the electrochemical performance of the cathode or anode material with low conductivity for lithium-ion batteries (LIBs). Herein, three-dimensional VS4/reduced graphene oxide (3DVG) hierarchical architecture with VS4 particles homogenously wrapped by the graphene nanosheets has been synthesized via a facile one-pot hydrothermal process. The 3DVG composite anode demonstrates excellent electrochemical performance: it exhibits a large specific capacity of 1044.2 mAh g(-1) (close to its theoretical capacity of 1196 mAh g(-1)) and remains 890.8 mAh g(-1) after 80 cycles at 0.2 A g(-1); it also has a large rate capacity of 479.2 mAh g(-1) even at 4 A g(-1). This superior performance of the 3D composite for LIBs is attributed to the porous 3D architecture with the conductive graphene interconnected network to guarantee the high conductivity and enable fast electron transport between graphene and VS4. Moreover, the 3DVG provides a hierarchical template to accommodate the volume change of VS4 particles during the electrochemical cycling. The 3DVG was proved as a high capacity anode material for LIBs. (C) 2016 Elsevier B.V. All rights reserved.