Lithium manganese iron phosphate positive electrode active material and preparation method

ChangeBridge: Patent Grants - Batteries (H01M)

Published March 31st, 2026

Detected March 31st, 2026

Summary

USPTO granted patent US12589999B2 to Contemporary Amperex Technology Co., Limited for a lithium manganese iron phosphate positive electrode active material and its preparation method. The patent covers a cathode material with nanoscale iron-containing oxide processing that achieves both improved electrochemical performance and high tap density for secondary batteries.

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What changed

USPTO issued patent US12589999B2 to Contemporary Amperex Technology Co., Limited (CATL) on March 31, 2026. The patent covers a lithium manganese iron phosphate positive electrode active material, its preparation method, a positive electrode plate, a secondary battery, and an electrical apparatus. The preparation method involves mixing and grinding an iron source, solid base, and optional doping elements to obtain nanoscale iron-containing oxide, then mixing with solvents and sources of lithium, manganese, phosphorus, and optional doping elements before granulating and sintering.

Patent holders may enforce their rights against infringers. Third parties developing similar lithium iron phosphate battery materials should consider whether a license is needed. The patent has 15 claims covering the material composition and manufacturing process.

Source document (simplified)

← USPTO Patent Grants

Lithium manganese iron phosphate positive electrode active material and preparation method, positive electrode plate, secondary battery and electrical apparatus thereof

Grant US12589999B2 Kind: B2 Mar 31, 2026

Assignee

CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventors

Shaojun Liu, Wenwei Zhan, Xinxin Zhang, Chuying Ouyang, Qingzheng Li

Abstract

A lithium manganese iron phosphate positive electrode active material, preparation method, a positive electrode plate, a secondary battery and an electrical apparatus are disclosed. The method comprises: mixing and grinding an iron source, a solid base and optionally a source of doping element M After grinding, impurities are removed to obtain a nanoscale iron-containing oxide; mixing the obtained nanoscale iron-containing oxide with a solvent, a lithium source, a manganese source, a phosphorus source, optionally a source of doping element N, optionally a source of doping element Q and optionally a source of doping element R in a predetermined ratio and then grinding. After grinding, granulating to obtain a powder; and sintering the powder to obtain the lithium manganese iron phosphate positive electrode active material. A lithium manganese iron phosphate positive electrode active material having both good electrochemical performance and high tap density can be obtained.