Three-dimensionally scaffolded Co3O4 nanosheet anodes with high rate performance

Jinyun Liu, Sean J. Kelly, Eric S. Epstein, Zeng Pan, Xingjiu Huang, Jinhuai Liu, Paul V. Braun

Research output: Contribution to journalArticlepeer-review

Abstract

Advances in secondary batteries are required for realization of many technologies. In particular, there remains a need for stable higher energy batteries. Here we suggest a new anode concept consisting of an ultrathin Co3O4 nanosheet-coated Ni inverse opal which provides high charge-discharge rate performance using a material system with potential for high energy densities. Via a hydrothermal process, about 4 nm thick Co3O4 nanosheets were grown throughout a three-dimensional Ni scaffold. This architecture provides efficient pathways for both lithium and electron transfer, enabling high charge-discharge rate performance. The scaffold also accommodates volume changes during cycling, which serves to reduce capacity fade. Because the scaffold has a low electrical resistance, and is three-dimensionally porous, it enables most of the electrochemically active nanomaterials to take part in lithiation-delithiation reactions, resulting in a near-theoretical capacity. On a Co3O4 basis, the Ni@Co3O4 electrode possesses a capacity of about 726 mAh g-1 at a current density of 500 mA g-1 after 50 cycles, which is about twice the theoretical capacity of graphite. The capacity is 487 mAh g-1, even at a current density of 1786 mA g-1.

Original languageEnglish (US)
Article number21626
Pages (from-to)40-48
Number of pages9
JournalJournal of Power Sources
Volume299
DOIs
StatePublished - Dec 20 2015

Keywords

  • Anode
  • High power
  • Mesostructured electrode
  • Nanostructure
  • Secondary battery

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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