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.
|ジャーナル||Journal of Power Sources|
|出版ステータス||出版済み - 1 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