Modified nano lithium iron phosphate material and its preparation method and application

By using PSS and MOF materials for superdispersion treatment, the nano lithium iron phosphate material was modified, which solved the problem of limited performance of lithium iron phosphate positive electrode material under high-rate discharge conditions, and achieved efficient modification and good cycle capacity retention.

CN119330329BActive Publication Date: 2025-03-25HUNAN YUNENG NEW ENERGY BATTERY MATERIALS CO LTD
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Patent Information

Application Number
CN202411890092.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-03-25
Estimated Expiration
2044-12-20

AI Technical Summary

Technical Problem

The performance of the existing lithium iron phosphate positive electrode materials under high-rate discharge conditions is limited, because their electron conductivity and lithium ion diffusion coefficient are low, and the high-temperature solid-phase sintering method has problems such as unevenness, difficulty in controlling the amount, and insufficient contact of reactants during the doping process.

Method used

The amphoteric polymer copolymer PSS and MOF materials are used for superdispersion treatment, and the nano lithium iron phosphate material is modified through ball milling and calcining steps to improve the compatibility and conductivity of lithium iron phosphate and doped raw materials.

Benefits of technology

The modification efficiency is significantly improved, the material's circulation capacity retention rate is enhanced, and the capacity retention rate is still ≥90% after 600 cycles under 5C conditions.

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Abstract

The present invention discloses a modified nano lithium iron phosphate material and a preparation method and application thereof, belonging to the technical field of lithium ion batteries, and comprising the following steps: S1. ultra-dispersing, filtering and drying a precursor solution to obtain a lithium iron phosphate precursor; the precursor solution comprises lithium iron phosphate, PSS and polyethylene glycol; S2. ball-milling and calcining the lithium iron phosphate precursor and MOF material to obtain a modified nano lithium iron phosphate material; the MOF material is at least one of a titanium-containing MOF material, an aluminum-containing MOF material and a zirconium-containing MOF material. The present invention improves the efficiency of MOF doping, and the modified nano lithium iron phosphate material finally obtained has a good cycle capacity retention rate.
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