Positive electrode material, method of preparation thereof and use thereof, and lithium-ion battery

ES3074124T3Undetermined Publication Date: 2026-07-17BEIJING EASPRING MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
ES · ES
Patent Type
Patents
Current Assignee / Owner
BEIJING EASPRING MATERIAL TECH CO LTD
Filing Date
2022-12-26
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing lithium-ion battery cathode materials face challenges in balancing short-term and long-term properties due to issues with pore diameter distribution and surface crystal structure stability, leading to decreased capacity and shortened service life.

Method used

A cathode material with specific pore diameter distribution, microcrystallite structure, and controlled pH during preparation processes to achieve optimal short-term and long-term performance, including a composition of Li(Ni1-x-y-z-mCoxMyGzHz)O2 with controlled sintering and cladding processes.

Benefits of technology

The cathode material enhances both initial charge-discharge capacity and cycle performance by regulating surface impedance and preventing surface collapse, thereby extending battery life and maintaining capacity retention.

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Abstract

The present invention relates to the field of positive electrode materials for lithium-ion batteries and describes a positive electrode material, a method for preparing the same, its use, and a lithium-ion battery. The positive electrode material is formed by agglomerating primary particles to form secondary particles. Through BJH (Biochemical Bonding), the secondary particles are given phase apertures d10, d50, and d90 that comply with the following phase system: 10 nm ≤ d50 ≤ 40 nm, 1 ≤ k90 ≤ 8, where k90 = (d90-d10) / d50. The positive electrode material possesses a specific phase aperture, aperture distribution, aperture area, and microcrystalline structure, such that during the charging and discharging processes of the lithium-ion battery prepared with this material, short-term performance, such as initial charge and discharge capacity, and long-term performance, such as capacity retention rate, can be improved.
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