Inverse Spinel LiNiVO4Synthesized by Moist Method at Low Temperature

Abstract

Abstract: In this paper, we report a new kind of moist chemical method for preparing LiNiVO₄which can be used to prepare lithium ion battery for the cathode active materials with a very high battery voltage(48 Vvs. Li). Li₂CO₃, NiCO₃and NH₄VO₃were used as row materials, and H₂C₂O₄saturated solution was used both as a precipitate agent and as a complex agent. The precursor gel composed of (NH₄)₂(VO)₂(C₂O₄)₄·6H₂O, NiC₂O₄·2H₂Oand Li 2C₂O₄can be obtained, and after sintering the dry gel we got the products. The results of XRDshow that the product sintered at 400 ℃ for 2 h exists in a cubic crystal, single phase, inverse LiNiVO₄and the average sizes (by Scherrer formula ) were 40-50 nm(400 ℃, 2 h ) and 65-70 nm(700 ℃, 2 h) , respectively, a=0.8223(1) nm. The TGand DTAcurves implied that the dry gel underwent water loss, decompositions of oxalates and complex oxalate, the solid state reactions finished at 377 ℃. The results of XPSproved that the valence in LiNiVO₄would be Li⁺,V⁵⁺, Ni²⁺(in the main), respectively. From ICPanalysis we also knew that the sample corresponded basically to stoichiometry LiNiVO₄.

Key words: Inverse spinel, LiNiVO₄, Moist chemical synthesis, Low temperature

CLC Number:

O614

TrendMD:

LAI Qiong-Yu, LU Ji-Zheng, LIANG Xing-Long, JI Xiao-Yang. Inverse Spinel LiNiVO₄Synthesized by Moist Method at Low Temperature[J]. Chem. J. Chinese Universities, 2000, 21(2): 190.

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Inverse Spinel LiNiVO₄Synthesized by Moist Method at Low Temperature

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