A positive electrode additive, a preparation method and a positive electrode sheet using the same

CN117038980BActive Publication Date: 2026-07-07EVE POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
EVE POWER CO LTD
Filing Date
2023-07-18
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Lithium-rich manganese-based cathode materials are prone to generating oxygen free radicals and hydroxyl free radicals during cycling, leading to cell gas production and performance degradation, which affects the cell's cycle life and energy density.

Method used

A positive electrode additive was prepared by using 5,5-dimethyl-1-pyrroline nitrogen oxides (DMPO) to form modified carbon materials in a hydrothermal reaction with fatty amines and organic carboxylic acids. This modified carbon material captures oxygen free radicals and hydroxyl free radicals, suppresses gas generation in the battery cell, and the modification effect is optimized by controlling the molar ratio and reaction conditions.

Benefits of technology

It effectively suppresses gas production in battery cells, improves battery energy density and cycle performance, extends the cycle life of battery cells, and reduces production costs.

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Abstract

The application provides a preparation method of a positive electrode additive, comprising the following steps: mixing a fatty amine, an organic carboxylic acid and 5,5-dimethyl-1-pyrroline N-oxide, and performing a hydrothermal reaction to obtain a mixed solution; filtering and freeze-drying the mixed solution to obtain the positive electrode additive; wherein the molar ratio of 5,5-dimethyl-1-pyrroline N-oxide to the fatty amine is <0.8:1, and the molar ratio of 5,5-dimethyl-1-pyrroline N-oxide to the organic carboxylic acid is <0.8:1. The preparation method provided by the application can capture oxygen free radicals in the battery cycle process by introducing 5,5-dimethyl-1-pyrroline N-oxide (DMPO), so as to inhibit the gas production of the battery cell, and can also capture hydroxyl radicals in the battery cycle process, so as to avoid the performance degradation of the battery cell caused by the generation of water. The positive electrode additive can be added to the positive electrode sheet, so that the positive electrode sheet has excellent energy density and cycle performance.
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Citation Information

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