Cathode material, method for preparing the same, and electrochemical device

A cathode material with a hollow structure and internal cavity structure addresses stress-related issues in high-nickel ternary materials, enhancing cycle life and energy density by buffering volume strain.

JP7888522B2Active Publication Date: 2026-07-13ENVISION DYNAMICS TECH (JIANGSU) CO LTD +3
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Patent Information

Application Number
JP2023210456
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2023-05-11
Filing Date
2023-12-13
Publication Date
2026-07-13
Estimated Expiration
2043-12-13

AI Technical Summary

Technical Problem

High-nickel ternary cathode materials suffer from microscopic stress during charge and discharge, leading to secondary particle destruction and deterioration of cycle and gas generation performance.

Method used

A cathode material with a hollow structure formed by secondary particles containing a cavity structure, where elements like sulfur adhere to the inner layer, providing a positive correlation between sulfur content and porosity, which buffers volume strain during charge-discharge.

Benefits of technology

The cathode material effectively mitigates secondary particle fracture and improves cycle life and volumetric energy density by allowing stress release through internal void structures.

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Patent Text Reader

Abstract

To provide a positive electrode material, a preparation method thereof, and an electrochemical device.SOLUTION: The positive electrode material is a secondary particle formed by the aggregation of primary particles. The secondary particle contains a cavity structure inside. Based on the positive correlation characteristics between the content of an A element in the positive electrode material particles and the cavity ratio, by introducing an appropriate proportion of the A element when the positive electrode material precursor is formed, the accompanying cavity structure formed inside the precursor is at an appropriate cavity ratio, in order to ensure that the positive electrode material may buffer the volume strain during the charge and discharge process through the internal appropriate proportion of the cavity structure, and alleviate the rupture phenomenon of the secondary particle during the cycle, thereby improving the cycle life and volume energy density of the positive battery.SELECTED DRAWING: Figure 1
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Citation Information

Patent Citations

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    JP2023008932A