Enhancing the Electrocatalysis of LiNi0.5Co0.2Mn0.3O2 by Introducing Lithium Deficiency for Oxygen Evolution Reaction

Robert Tenent, Di Huang, Chaiwat Engtrakul, Anthony Burrell, Jiuling Yu, Zhengcheng Zhang, Meng Zhou, Hongmei Luo

Research output: Contribution to journalArticlepeer-review

19 Scopus Citations

Abstract

LiNi0.5Co0.2Mn0.3O2 (NCM523), as a cathode material for rechargeable lithium-ion batteries, has attracted considerable attention and been successfully commercialized for decades. NCM is also a promising electrocatalyst for the oxygen evolution reaction (OER), and the catalytic activity is highly correlated to its structure. In this paper, we successfully obtain NCM523 with three different structures: spinel NCM synthesized at low temperature (LT-NCM), disordered NCM (DO-NCM) with lithium deficiency obtained at high temperature, and layered hexagonal NCM at high temperature (HT-NCM). By introducing lithium deficiency to tune the valence state of transition metals in NCM from Ni2+ to Ni3+, DO-NCM exhibits the best catalytic activity with the lowest onset potential (∼1.48 V) and Tafel slope (∼85.6 mV dec-1), whereas HT-NCM exhibits the worst catalytic activity with the highest onset potential (∼1.63 V) and Tafel slope (∼241.8 mV dec-1).

Original languageAmerican English
Pages (from-to)10496-10502
Number of pages7
JournalACS Applied Materials and Interfaces
Volume12
Issue number9
DOIs
StatePublished - 4 Mar 2020

Bibliographical note

Publisher Copyright:
Copyright © 2020 American Chemical Society.

NREL Publication Number

  • NREL/JA-5K00-75112

Keywords

  • cation mixing
  • disordered layered hexagonal structure
  • lithium deficiency
  • NCM523
  • OER
  • polymer-assisted solution method

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