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 Li(2)NiTia(4) (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. (C) 2013 Elsevier B.V. All rights reserved.