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
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- SEMICON ENERGY LAB CO LTD
- 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.
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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.
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