Method for preparing positive electrode active material

A hydrothermal process using high-purity lithium, phosphorus, and iron compounds addresses the purity and stability issues of positive electrode active materials, resulting in improved lithium-ion secondary batteries with enhanced capacity and reliability.

JP2026113568APending Publication Date: 2026-07-07SEMICON ENERGY LAB CO LTD
View PDF 2 Cites 0 Cited by

Patent Information

Application Number
JP2026059958
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2020-09-04
Filing Date
2026-04-01
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

The challenge in improving lithium-ion secondary batteries lies in enhancing the purity and stability of the positive electrode active material to achieve higher capacity, improved cycle characteristics, and increased reliability and safety.

Method used

A method involving the use of high-purity lithium, phosphorus, and iron compounds in a hydrothermal process to produce a composite oxide with controlled pH and pressure conditions, resulting in a highly purified positive electrode active material with a stable crystal structure.

Benefits of technology

The method produces a positive electrode active material with enhanced purity, stability, and charge-discharge cycle characteristics, leading to higher capacity and improved reliability of secondary batteries.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 2026113568000001_ABST
    Figure 2026113568000001_ABST
Patent Text Reader

Abstract

This invention provides a method for producing highly purified positive electrode active materials, or a method for producing positive electrode active materials whose crystal structure is resistant to collapse even after repeated charging and discharging. [Solution] A method for producing a positive electrode active material having lithium and a transition metal, comprising: a first step of preparing a lithium compound, a phosphorus compound and water; a second step of mixing the lithium compound, the phosphorus compound and water to form a first mixture; a third step of adding a first aqueous solution to the first mixture to adjust the pH and form a second mixture; a fourth step of mixing an iron(II) compound to the second mixture to form a third mixture; a fifth step of heating the third mixture to form a fourth mixture; and a sixth step of filtering, washing and drying the fourth mixture to obtain a positive electrode active material, wherein the lithium compound, phosphorus compound, water and iron(II) compound are made of high-purity materials.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Method of manufacturing positive electrode material for lithium ion battery and lithium ion battery

    JP2004095385A

  • Wet air oxidation process using recycled catalyst

    WO2008091578A1