The effects of persulfate treatment on the electrochemical properties of Li[Li0.2Mn0.54Ni0.13Co0.13]O2cathode material

Jun Zheng, Shengnan Deng, Zhicong Shi, Hongjie Xu, Hui Xu, Yuanfu Deng, Zachary Zhang, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

101 Citations (Scopus)

Abstract

Spherical Li[Li0.2Mn0.54Ni0.13Co0.13]O2material was treated with persulfates Na2S2O8or (NH4)2S2O8to extract lithium to increase the coulombic efficiency of the first cycle. The two persulfates showed different effects. Na2S2O8greatly improved the first cycle efficiency of the active material to nearly 100%. The rate performance was also increased to more than 200 mAh g-1at 1C rate. The reason for the improved rate performance by the treatment of Na2S2O8is attributed to the formation of spinel phase on the surface of the material and the extraction of lithium and oxygen, which results in a decreased electrochemical resistance, whereas the treatment with (NH4)2S2O8deteriorated the electrochemical performance of the Li-rich compound due to the Li+/H+exchange and the collapse of the layered structure.
Original languageEnglish
Pages (from-to)108-113
Number of pages6
JournalJournal of Power Sources
Volume221
DOIs
Publication statusPublished - 1 Jan 2013
Externally publishedYes

Keywords

  • Carbonate precipitate
  • Cathode materials
  • Lithium-rich compound
  • Persulfate treatment
  • Rate capability

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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