A composite manganese iron lithium phosphate positive electrode material, a preparation method and application thereof

The core-shell structure of the composite lithium manganese iron phosphate material, with lithium iron phosphate as the core, iron phosphide as the middle layer, and carbon-coated lithium manganese iron phosphate as the outer layer, solves the problem of poor conductivity of lithium manganese iron phosphate, achieving higher energy density and electrochemical performance, and is suitable for lithium-ion batteries.

CN116154137BActive Publication Date: 2026-06-26SVOLT ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SVOLT ENERGY TECHNOLOGY CO LTD
Filing Date
2023-03-07
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing lithium manganese iron phosphate materials have poor conductivity, which makes it difficult to fully realize their electrochemical performance. In addition, the preparation cost is high, making it difficult to achieve industrial production. The electrochemical performance needs to be further improved.

Method used

A core-shell structured composite lithium manganese iron phosphate material is formed by a specific preparation method, with lithium iron phosphate as the core, iron phosphide as the middle layer, and carbon-coated lithium manganese iron phosphate as the outer layer, thus optimizing the ion mobility and voltage plateau of the material.

Benefits of technology

The material's energy density and electrochemical performance have been improved, resulting in higher mass and volumetric energy density for full-cell batteries. The material's conductivity and stability have also been enhanced, making it suitable as a cathode material for high-performance lithium-ion batteries.

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Abstract

The application provides a composite manganese iron lithium phosphate positive electrode material and a preparation method and application thereof. The composite manganese iron lithium phosphate positive electrode material comprises a lithium iron phosphate core and a successively laminated iron phosphide intermediate layer and a composite coating layer on the surface of the lithium iron phosphate core. The composite coating layer comprises a carbon material coated manganese iron lithium phosphate material. The composite manganese iron lithium phosphate positive electrode material has a core-shell structure, the core is a phosphoric acid iron coated lithium iron phosphate, and the shell layer is a carbon coated manganese iron lithium phosphate coating layer. The unique structure design of the lithium iron phosphate core and the manganese iron lithium phosphate shell layer enables the composite material to have excellent electrochemical performance.
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Citation Information

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