Performance and mechanism research of hierarchically structured Li-rich cathode materials for advanced lithium–ion batteries

Shaomeng Ma, Xianhua Hou, Yajie Li, Qiang Ru, Shejun Hu, Kwok Ho Lam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)

Abstract

The hierarchically structured cathode material Li1.165Mn0.501Ni0.167Co0.167O2(LMNCO) is successfully synthesized via a facile ultrasonic-assisted co-precipitation method with a two-step heat treatment by adopting graphene and carbon nanotubes (CNTs) as functional framework and modified material. The structure and electrochemical performance degeneration mechanism were systematically investigated in this work. The obtained LMNCO microspheres possess a hierarchical nano-micropore structure assembled with nanosized building blocks, which originates from the oxidative decomposition of the transition metal carbonate precursor and carbonaceous materials accompanied with the release of CO2(but still remain carbon residue). What’s more, the positive electrode exhibits enhanced specific capacities (276.6 mAh g−1at 0.1 C), superior initial coulombic efficiency (80.3 %), remarkable rate capability (60.5 mAh g−1at 10 C) and high Li+diffusion coefficient (~10−9cm2s−1). The excellent performances can be attributed to the pore structure, small particle sizes, large specific surface area and enhanced electrical conductivity. (1 C = 250 mA g−1).
Original languageEnglish
Pages (from-to)2705-2715
Number of pages11
JournalJournal of Materials Science: Materials in Electronics
Volume28
Issue number3
DOIs
Publication statusPublished - 1 Feb 2017

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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