A facile approach to nanoarchitectured threedimensional graphene-based Li-Mn-O composite as high-power cathodes for Li-ion batteries

Wenyu Zhang, Yi Zeng, Chen Xu, Ni Xiao, Yiben Gao, Lain-Jong Li, Xiaodong Chen, Huey Hoon Hng, Qingyu Yan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

We report a facile method to prepare a nanoarchitectured lithium manganate/graphene (LMO/G) hybrid as a positive electrode for Li-ion batteries. The Mn 2O 3/graphene hybrid is synthesized by exfoliation of graphene sheets and deposition of Mn 2O 3 in a onestep electrochemical process, which is followed by lithiation in a molten salt reaction. There are several advantages of using the LMO/G as cathodes in Li-ion batteries: (1) the LMO/G electrode shows high specific capacities at high gravimetric current densities with excellent cycling stability, e.g., 84 mAh·g -1 during the 500th cycle at a discharge current density of 5625 mA·g -1 (~38.01 C capacity rating) in the voltage window of 3-4.5 V; (2) the LMO/G hybrid can buffer the Jahn-Teller effect, which depicts excellent Li storage properties at high current densities within a wider voltage window of 2-4.5 V, e.g., 93 mAh·g -1 during the 300th cycle at a discharge current density of 5625 mA·g -1 (~38.01 C). The wider operation voltage window can lead to increased theoretical capacity, e.g., 148 mAh·g-1 between 3 and 4.5 V and 296 mAh·g -1 between 2 and 4.5 V; (3) more importantly, it is found that the attachment of LMO onto graphene can help to reduce the dissolution of Mn 2+ into the electrolyte, as indicated by the inductively coupled plasma (ICP) measurements, and which is mainly attributed to the large specific surface area of the graphene sheets.

Original languageEnglish (US)
Pages (from-to)513-523
Number of pages11
JournalBeilstein Journal of Nanotechnology
Volume3
Issue number1
DOIs
StatePublished - Aug 17 2012

Keywords

  • Cathode
  • Graphene
  • Li-ion battery
  • Lithium manganate

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)
  • Electrical and Electronic Engineering

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