Positive electrode additive and preparation method, use, secondary battery and terminal device thereof

By using secondary particles composed of alkali-rich metal materials and electronic conductive agents in the positive electrode of lithium-ion batteries, the problem of low lithium consumption and cycle life of lithium-ion batteries is solved, higher energy density and cycle life are achieved, and the cyclic expansion of the battery cell is reduced.

CN115881960BActive Publication Date: 2025-03-18HUAWEI TECH CO LTD
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Patent Information

Application Number
CN202111165759.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-09-30
Publication Date
2025-03-18
Estimated Expiration
2041-09-30

AI Technical Summary

Technical Problem

During the first charging and cyclic charging and discharging of existing lithium-ion batteries, active lithium consumes a large amount, resulting in low cycle life and energy density, and low lithium supplement capacity of positive electrode, which cannot meet the usage requirements.

Method used

A positive electrode additive is used, which includes secondary particles, which are composed of alkali-rich metal materials and electronic conductive agents. By controlling the internal voids of the secondary particles below 500 nm, the transmission and conductivity of active ions are improved.

Benefits of technology

It significantly improves the replenishment effect and conduction rate of positive electrode active ions, extends the cycle life of the secondary battery, increases the energy density, and alleviates the cyclic expansion of the battery cell.

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Abstract

The present application provides a positive electrode additive and its preparation method, use, secondary battery and terminal equipment. The positive electrode additive includes secondary particles, the secondary particles include at least two primary particles, at least one primary particle in the primary particles is an alkali-rich material, and at least one primary particle is an electronic conductive agent; in the molecular formula of the alkali-rich material, the molecular weight of the alkali metal element accounts for more than 10% of the total molecular weight of the alkali-rich material; wherein the gap between adjacent primary particles is ≤500nm. The positive electrode additive can improve the cycle life and energy density of the secondary battery and alleviate the cycle expansion of the battery cell.
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