Sodium-ion battery, battery pack, and energy storage system

By using composite cathode materials in sodium-ion batteries and combining them with small-particle-size stabilizers to form a conductive network, the problem of low cycle life in sodium-ion batteries has been solved, and the cycle stability and high-current discharge performance under high-temperature conditions have been improved.

CN119786598BActive Publication Date: 2026-05-29HUAWEI DIGITAL POWER TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUAWEI DIGITAL POWER TECH CO LTD
Filing Date
2023-10-08
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The positive electrode material of sodium-ion batteries suffers from large lattice volume changes due to the large radius of sodium ions during charging and discharging, resulting in low cycle life, especially severe cycle life degradation under high temperature environments.

Method used

A composite cathode material is used, including a cathode active material and a stabilizer. The particle size of the stabilizer is smaller than that of the cathode active material, and its molecular structure contains (XO4)n- groups, forming a continuous and reliable conductive network, thereby improving the structural stability and conductivity of the material.

Benefits of technology

It improves the cycle life and rate performance of sodium-ion batteries, especially showing high cycle stability and high current discharge capacity retention in high-temperature environments.

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Abstract

The application provides a sodium ion battery, a battery pack and an energy storage system. The composite positive electrode material comprises a positive electrode active material and a stabilizer, the positive electrode active material is a sodium ion layered oxide, the stabilizer is filled between particles of the positive electrode active material, the particle size of the stabilizer is smaller than that of the positive electrode active material, and the molecular structure of the stabilizer contains (XO4) n‑ groups. Wherein X is selected from at least one of P, S or Si, and the atomic percentage of X in the composite positive electrode material is 1% to 15%. The composite positive electrode material can be used to improve the cycle life of the sodium ion battery.
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