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

13 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 1
Externally publishedYes

Fingerprint

boric acids
Boric acid
Spray pyrolysis
classifiers
Powders
pyrolysis
sprayers
Cathodes
Classifiers
cathodes
composite materials
Composite materials
lithium borates
mixed crystals
boric acid
Melting point
standard deviation
Lithium
Crystal structure
melting

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

Cite this

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

In: Materials Research Bulletin, Vol. 47, No. 12, 01.12.2012, p. 4359-4364.

Research output: Contribution to journalArticle

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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{\%}.",
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AU - Kang, Yun Chan

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