A lithium ion battery material and a preparation method thereof

Abstract

The invention discloses a lithium ion battery material, which is composed of the following raw materials in parts by weight: lithium hydroxide 50-80, ferrous ammonium phosphate 80-100, 2-thiol benzimidazole 1-2, nano-dispersion 30- 40, thiophene 15-20, and dibenzoyl peroxide 0.3-0.4., The nano-silicon dioxide is first doped with phosphorus trichloride and then reacts with triethanolamine to effectively improve the surface activity of the silicon dioxide. The invention uses thiophene as a monomer and the nano-dispersion as a reaction solvent and realizes the effective combination of the nano-silicon dioxide and the polythiophene through polymerization, thereby improving the sintering stability and the electric conductivity of the finished product material.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a lithium ion battery material and a preparation method thereof. Background technique [0002] Lithium-ion power battery is currently recognized as the most potential vehicle battery at home and abroad. It is mainly composed of positive electrode materials, negative electrode materials, separators, electrolytes, etc. Among them, positive electrode materials are an important part of lithium-ion batteries and also determine the quality of lithium-ion batteries. The key factor of performance; therefore, in terms of resources, environmental protection and safety performance, finding the ideal electrode active material for lithium-ion batteries is still the primary problem to be solved by international energy materials workers; [0003] At present, the commercialized lithium-ion battery cathode materials mainly include lithium cobalt oxide and lithium manganese oxide. [...

AI Technical Summary

Problems solved by technology

[0004] and lithium iron phosphate; lithium cobaltate is currently widely used as a positive electrode material for small lithium-ion batteries, but because cobalt is toxic, resource reserves are limited and expensive, and batteries assembled with lithium cobaltate materials as positive electrode materials have poor safety and thermal stability. Well, oxygen will be produced at high temperature, which cannot meet the technical requirements of power batteries; although lithium manganate is cheap, environmentally friendly, safe, and has good rate performance and safety performance, its theoretical capacity is not high, and its cycle performance, thermal stability and The high temperature performance is poor, and the biggest problem in application is poor cycle performance, especially at high temperature, the trivalent manganese ions in the material and the divalent manganese ions formed on the particle surface during high-rate discharge make the material in the electrolyte The dissolution of lithium manganate is obvious, which eventually destroys the structure of lithium manganate and reduces the cycle performance of the material;