Inverse spinel LiNiVO4 synthesized by moist method at low temperature

In this paper, we report a new kind of moist chemical method for preparing LiNiVO4 which can be used to prepare lithium ion battery for the cathode ac tive materials with a very high battery voltage(4.8 V vs. Li). Li2CO3, NiCO 3 and NH4VO3 were used as row materials, and H2C2O4 saturated solution was used both as a precipitate agent and as a complex agent. The precursor gel composed of (NH4)(2)(VO)(z) (C2O4)(4) . 6H(2)O, NiC2O4 2H(2)O and Li2C2O4 c an be obtained, and after sintering the dry gel we got the products. The re sults of XRD show that the product sintered at 400 degrees C for 2 h exists in a cubic crystal, single phase, inverse LiNiVO4 and the average sizes (b y Scherrer formula) were 40-50 nm(400 degrees C, 2 h) and 65-70 nm(700 degr ees C, 2 h), respectively, a = 0.822 3(1) nm. The TG and DTA curves implied that the dry gel underwent water loss, decompositions of oxalates and comp lex oxalate, the solid state reactions finished at 377 degrees C. The resul ts of XPS proved that the valence in LiNiVO4 would be Li+,V5+ Ni2+ (in the main), respectively. From ICP analysis we also knew that the sample corresp onded basically to stoichiometry LiNiVO4.