Electrochemical properties of 0.6Li2MnO3 · 0.4Li(Ni0.8Co0.15Al0.05)O2 composite nanopowders prepared by spray pyrolysis

Yong Seung Jang, Jung Hyun Kim, Jung Kul Lee, Byung Kyu Park, Yun Chan Kang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Nano-sized composite cathode powders [0.6Li2MnO3. 0.4Li(Ni0.8Co0.15Al0.05)O2] are prepared by a scalable spray pyrolysis process. The addition of an organic additive into the spray solution is a key factor for the large production of nano-sized composite cathode powders. After post-treatment at high temperatures and a simple milling process, the composite powders prepared from a spray solution with citric acid and ethylene glycol are the size of nanometers. Mean sizes of the powders after post-treatment at 600 and 900°C are 20 and 200 nm, respectively. An ICP analysis determined that the mole ratio of Li/(Ni + Mn + Co) in the powders post-treated at 900°C, is 1.3. The initial charge capacities of the powders post-treated at 600, 700, 800, and 900oC are 357, 341, 338, and 294 mAh g-1. Their initial discharge capacities are 218, 233, 231, and 240 mAh g-1. The composite powders post-treated at 900°C have the highest Coulombic efficiency. The discharge capacity of the composite powders post-treated at 900oC decreases from 240 to 229 mAh g-1 by the 30th cycles, in which the capacity retention is 95.4%.

Original languageEnglish
Pages (from-to)12370-12382
Number of pages13
JournalInternational Journal of Electrochemical Science
Volume7
Issue number12
Publication statusPublished - 2012 Dec 20
Externally publishedYes

Keywords

  • Cathode materials
  • Composite material
  • Lithium battery
  • Lithium rich
  • Spray pyrolysis

ASJC Scopus subject areas

  • Electrochemistry

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