Self-organized core-shell structure for high-power electrode in solid-state lithium batteries

Xiaoxiong Xu, Kazunori Takada, Ken Watanabe, Isao Sakaguchi, Kosho Akatsuka, Bui T. Hang, Tsuyoshi Ohnishi, Takayoshi Sasaki

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

Effect of Al-substitution for Co on the electrode properties of LiCoO 2 is investigated in a sulfide solid electrolyte. The substitution decreases the electrode resistance and thus improves the high-rate capability. Investigation of the post-annealing effect revealed that, although the crystal structure or morphology of the LiAlxCo1-xO2 are not significantly changed by the post-annealing, the electrode properties are highly dependent on the post-annealing conditions, which suggests that the improvement in high-rate capability comes from the change in surface structure of the LiAlxCo1-xO2 particles (i.e., self-organized core-shell structure). The Al-substituted LiCoO2 obtained through this study delivers a discharge capacity of 115 mAh g -1 at 1 C and 84 mAh g-1 even at a high discharge rate of 5 C at 25 °C, which is one of the highest rate capabilities observed in solid-state cells.

Original languageEnglish
Pages (from-to)3798-3804
Number of pages7
JournalChemistry of Materials
Volume23
Issue number17
DOIs
Publication statusPublished - Sep 13 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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