Novel polyanion type positive electrode material preparation process

Abstract

The present invention provides a novel polyanion type positive electrode material preparation process. The technical scheme comprises that an organic matter assisted spray drying method is adopted to prepare the novel polyanion type positive electrode material Li3V2(PO4)3, and the prepared Li3V2(PO4)3 has the specific capacity close to the theoretical capacity, and has good rate cycle stability. The preparation process of the present invention has the following characteristics that: the monoclinic crystal base Li3V2(PO4)3 has the NASICON (sodiumsuperionconductor) structure so as to improve the rate performance of the material; and the 3 Li<+> in Li3V2(PO4)3 can be reversibly inserted and deinserted, the theoretical specific capacity achieves 197 mAh / g, and the Li3V2(PO4)3 has the highest specific capacity in the currently found phosphate lithium ion battery electrode material.

Description

technical field [0001] The invention discloses a novel polyanionic cathode material Li 3 V 2 (PO 4 ) 3 preparation process. Background technique [0002] Lithium-ion batteries are favored for their many advantages and are currently the most advanced secondary batteries. Li-ion battery cathode [0003] Materials are the bottleneck for breakthroughs in the performance of lithium-ion batteries, and the key to the commercialization of lithium-ion battery electric vehicles. [0004] bond, so the research on cathode materials is particularly important. Although the olivine structure of LiFePO 4 Since it can be used as a cathode material for lithium-ion batteries, it has attracted much attention due to its advantages of low price, non-toxicity, good environmental compatibility, high specific capacity, good stability and safety performance, but it faces the constraints of the following problems: 1 ) The small tap density and low voltage platform of the material lead to low v...

AI Technical Summary

Problems solved by technology

Although the olivine structure of LiFePO 4 Since it can be used as a cathode material for lithium-ion batteries, it has attracted much attention for its advantages of low price, non-toxicity, good environmental compatibility, high specific capacity, good stability and safety performance, but it faces the constraints of the following problems: 1 ) The small tap density and low voltage platform of the material lead to low volume energy density; 2) The electronic conductivity and ion diffusion coefficient of the material are small, resulting in poor high-rate charge and discharge performance, which seriously limits its further development