A kind of composite modified ternary material and preparation method thereof

Abstract

The invention relates to a composite modified ternary material and a preparation method thereof. The technical scheme is: according to the solution concentration of 2 ~ 5kg / m 3 , adding nano-carbon into the organic solvent and stirring to obtain solution I. According to the mass ratio of nano-carbon:ion-conducting polymer as 1:(1.5-2), add the ion-conducting polymer into the solution I and stir to obtain the solution II. By Nano Carbon: LiNi 1‑x‑y co x mn y o 2 The mass ratio of ternary materials is 1:(5~20), add LiNi to solution Ⅱ 1‑x‑y co x mn y o 2 The ternary material was stirred to obtain solution Ⅲ. The solution III is added dropwise into the liquid nitrogen solution to obtain spherical beads, and then freeze-dried for 48-72 hours to obtain a composite modified ternary material. The invention has the characteristics of simple process, convenient operation and easy industrial production, and the prepared composite modified ternary material has good dispersion, adjustable pore structure, stable structure, good cycle performance and excellent high rate performance.

Description

technical field [0001] The invention belongs to the technical field of modified ternary materials. It specifically relates to a composite modified ternary material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, good cycle performance, long service life and small size, and have been widely used in portable electronic products such as mobile phones, notebook computers and cameras, and have recently been used in power batteries and other large energy storage batteries. It shows remarkable development prospects. The huge demand for electronic products and the potential huge market for industries such as electric vehicle batteries have made the development of a new generation of lithium-ion batteries with high specific capacity, low cost, and safety and reliability a new research focus in the field of chemical power sources. [0003] The ternary cathode material combines the advantages of lithiu...

AI Technical Summary

Problems solved by technology

However, there are also some problems that need to be solved urgently. The main problems include: low electronic conductivity; poor stability at large rates; poor cycle stability at high voltage;

However, some ion-conducting polymers are difficult to dissolve in water, have poor dispersion, and cannot be uniformly coated on the surface of the ternary material, which greatly reduces the structural stability and affects the cycle stability and high-rate performance of the ternary material during charge and discharge.

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