Surface modification of LiNi1/2Mn3/2O4 thin-films by zirconium alkoxide/PMMA composites and their effects on electrochemical properties

Takayuki Doi, Jun ichi Kageura, Shigeto Okada, Jun ichi Yamaki

研究成果: Contribution to journalArticle査読

5 被引用数 (Scopus)

抄録

Three kinds of surface modifications were carried out on LiNi1/2Mn3/2O4 thin-films to improve the charge and discharge characteristics of LiNi1/2Mn3/2O4 positive electrodes. Among them, Zr(OBu)4/poly(methyl methacrylate) (PMMA)-treated LiNi1/2Mn3/2O4 thin-film electrodes showed charge and discharge efficiency of 80-84% in the first cycle, which was much higher than that for an untreated LiNi1/2Mn3/2O4 thin-film electrode (73%). The values of the charge and discharge efficiency were still higher than that for an untreated electrode after the 30th cycle. The charge and discharge curves gave two plateaus at around 4.72 and 4.76 V, which were very similar to those for the untreated electrode. Ac impedance spectroscopy revealed that the surface film resistance should not increase by Zr(OBu)4/PMMA treatment. XPS measurements suggest that a composite layer should be formed on a LiNi1/2Mn3/2O4 thin-film electrode from PMMA and Zr(OBu)4-derived compounds introducing an electrolyte. This composite layer was lithium-ion conductive, and was sustainable enough to suppress subsequent decomposition of an electrolyte at potentials as high as 4.7 V.

本文言語英語
ページ(範囲)473-479
ページ数7
ジャーナルJournal of Power Sources
185
1
DOI
出版ステータス出版済み - 10 15 2008

All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 物理化学および理論化学
  • 電子工学および電気工学

フィンガープリント

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