Pseudocapacitance of amorphous TiO2@nitrogen doped graphene composite for high rate lithium storage

Sheng Li, Pan Xue, Chao Lai, Jingxia Qiu, Min Ling, Shanqing Zhang

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

The high rate applications such as electric vehicles of the traditional lithium ion batteries (LIBs) are commonly limited by their insufficient electron conductivity and slow mass transport of lithium ions in bulk electrode materials. In order to address these issues, in this work, a simple and up-scalable wet-mechanochemical (wet-ball milling) route has been developed for fabrication of amorphous porous TiO2@nitrogen doped graphene (TiO2@N-G) nanocomposites. The amorphous phase, unique porous structure of TiO2 and the surface defects from nitrogen doping to graphene planes have incurred surface controlled reactions, contributing pseudocapacitance to the total capacity of the battery. It plays a dominant role in producing outstanding high rate electrochemical performance, e.g., 182.7 mAh/g (at 3.36 A/g) after 100 cycles. The design and synthesis of electrode materials with enhanced conductivity and surface pseudocapacitance can be a promising way for high rate LIBs.

Original languageEnglish
Article number25567
Pages (from-to)112-119
Number of pages8
JournalElectrochimica Acta
Volume180
DOIs
StatePublished - 20 Oct 2015
Externally publishedYes

Keywords

  • Graphene
  • Lithium ion batteries
  • Nitrogen doping
  • Pseudocapacitance
  • TiO

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