Synthesis and cathode properties of a cubic rocksalt-type Si-doped Li2NiTiO4 for lithium-ion batteries

Yusuke Kawano, Ayuko Kitajou, Shigeto Okada

Research output: Contribution to journalArticle

Abstract

Li2NiSixTi1-xO4 was obtained by the sol-gel method under ambient pressure in the whole 0 ≤ x ≤ 0.2 regions. The lattice constant did not change, but the crystallinity decreased by increasing the Si doping level. The discharge capacities at the rate of 0.32 mA g-1 for the obtained Li2NiTiO4 and Li2NiSi0.1Ti0.9O4 were 153.4 mAh g-1 and 145.5 mAh g-1, respectively. The energy densities of the Li2NiTiO4 (598 mWh g-1) and Li2NiSi0.1Ti0.9O4 (567 mWh g-1) obtained at the rate of 0.32 mA g-1 were equivalent to that of LiCoO2. Moreover, the discharge capacities of Li2NiTiO4 and Li2NiSi0.1Ti0.9TiO4 remained at 57.1 mAh g-1 and 75.6 mAh g-1 even after 20 cycles, respectively. In addition, the framework of Li2NiTiO4 and Li2NiSixTi1-xO4 was stable enough to maintain its charge-discharge processes at the first cycle by expansion and contraction of the lattice accompanying the extraction/insertion of lithium.

Original languageEnglish
Pages (from-to)768-774
Number of pages7
JournalJournal of Power Sources
Volume242
DOIs
Publication statusPublished - Jan 1 2013

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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