• 文献标题:   Graphene-wrapped CoNi-layered double hydroxide microspheres as a new anode material for lithium-ion batteries
  • 文献类型:   Article
  • 作  者:   SHI LL, CHEN YX, HE RY, CHEN XH, SONG HH
  • 作者关键词:  
  • 出版物名称:   PHYSICAL CHEMISTRY CHEMICAL PHYSICS
  • ISSN:   1463-9076 EI 1463-9084
  • 通讯作者地址:   Beijing Univ Chem Technol
  • 被引频次:   2
  • DOI:   10.1039/c8cp01681j
  • 出版年:   2018

▎ 摘  要

High-performance electrode materials that can be easily prepared are imperative for obtaining highly efficient lithium-ion batteries (LIBs). In this study, graphene-wrapped CoNi-layered double hydroxide (LDH) microspheres were first fabricated and used as an anode material for LIBs. The composite electrode with a mass ratio of 2.5 : 1 (CoNi-LDH/graphene) showed a high reversible specific capacity of 1428.0 mA h g(-1) at 0.05 A g(-1), excellent rate performances (977.5, 670.8 and 328.1 mA h g(-1) at 0.5, 2 and 10 A g(-1), respectively) and long-cycling performance (75% retention at 10 A g(-1) after 10 000 cycles). The excellent electrochemical performances could be due to the following reasons: CoNi-LDHs had high chemical reactivity, and the graphene shell improved the electrical conductivity of CoNi-LDHs, which facilitated charge transfer; the graphene shell also suppressed the volume expansion of metal hydroxides during charge-discharge cycling and enhanced the cycle stability of the electrode. More importantly, this is a significant study to directly use LDHs as a potential electrode for LIBs, which can promote applications of electro-active LDHs in energy storage and conversion fields.