Effect of boric acid on the properties of Li 2MnO 3·LiNi 0.5Mn 0.5O 2 composite cathode powders prepared by large-scale spray pyrolysis with droplet classifier

Young Jun Hong, Seung Ho Choi, Chul Min Sim, Jung Kul Lee, Yun Chan Kang

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Spherically shaped 0.3Li 2MnO 3·0.7LiNi 0.5Mn 0.5O 2 composite cathode powders with filled morphology and narrow size distribution are prepared by large-scale spray pyrolysis. A droplet classification reduces the standard deviation of the size distribution of the composite cathode powders. Addition of boric acid improves the morphological properties of the product powders by forming a lithium borate glass material with low melting temperature. The optimum amount of boric acid dissolved in the spray solution is 0.8 wt% of the composite powders. The powders prepared from the spray solution with 0.8 wt% boric acid have a mixed layered crystal structure comprising Li 2MnO 3 and LiNi 0.5Mn 0.5O 2 phases, thus forming a composite compound. The initial charge and discharge capacities of the composite cathode powders prepared from the 0.8 wt% boric acid spray solution are 297 and 217 mAh g -1, respectively. The discharge capacity of the powders decreases from 217 to 196 mAh g -1 by the 30th cycle, in which the capacity retention is 90%.

Original languageEnglish
Pages (from-to)4359-4364
Number of pages6
JournalMaterials Research Bulletin
Volume47
Issue number12
DOIs
Publication statusPublished - 2012 Dec
Externally publishedYes

Keywords

  • A. Layered compounds
  • B. Chemical synthesis
  • C. Electrochemical measurements
  • D. Energy storage

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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