A simple mechano-thermal coating process for improved lithium battery cathode materials

George Ting Kuo Fey, Hao Zhong Yang, T. Prem Kumar, Sajo P. Naik, Anthony S.T. Chiang, Dzu Chi Lee, Jinn Ren Lin

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


A simple, economical and convenient mechano-thermal coating procedure for the production of LiCoO2 with improved cycling performance is described. The coating material was pre-formed nanoparticulate fumed silica. TEM studies with a 1.0wt.% silica-coated cathode suggested that the silica species partially diffused into the bulk of the cathode material. XRD studies showed a diminished lattice parameter c upon coating, indicating that a substitutional compound of the LiSiyCo1-yO2+0.5y type might have formed upon calcination. SEM images, R-factor values from XRD studies and electrochemical studies showed that a coating level of 1.0wt.% gave an optimal performance in capacity and cyclability. SEM images showed that above this level, the excess silica formed spherules, which got glued to the coated cathode particles. Galvanostatic cycling studies showed that at a coating level of 1.0wt.%, cyclability improved three and nine times for two commercial LiCoO 2 samples.

Original languageEnglish
Pages (from-to)172-180
Number of pages9
JournalJournal of Power Sources
Issue number1-2
StatePublished - 20 May 2004


  • Coated cathodes
  • Coated LiCoO
  • Fumed silica
  • Lithium-ion battery
  • Mechano-thermal coating


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