A lithium iron manganese phosphate cathode sheet containing lithium supplementation additives and its preparation method

By using mesophase pitch mixed lithium supplementation additive and NiCoB alloy as current collector and conductive agent in lithium manganese iron phosphate cathode sheet, the problems of poor conductivity and cycle performance of lithium manganese iron phosphate material are solved, and the conductivity and cycle stability of battery are improved.

CN117747846BActive Publication Date: 2026-05-26HEFEI GUOXUAN HIGH TECH POWER ENERGY
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HEFEI GUOXUAN HIGH TECH POWER ENERGY
Filing Date
2023-12-15
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Lithium manganese iron phosphate cathode materials suffer from poor conductivity and cycle performance, resulting in poor rate performance and John-Teller effect cycle performance that is significantly different from lithium iron phosphate materials, thus limiting their further development.

Method used

A mesophase pitch mixed with lithium-supplementing additives is used as a current collector, and a NiCoB alloy with excellent conductivity is used to replace the conventional carbon material conductive agent. The lithium-supplementing additives are anchored in the mesophase pitch through blending, which enhances conductivity and suppresses the John-Teller effect of Mn.

Benefits of technology

It improves the conductivity and mechanical properties of lithium iron manganese phosphate cathode, reduces the impact of structural changes during delithiation, and enhances cycle stability and battery energy density.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure SMS_1
    Figure SMS_1
Patent Text Reader

Abstract

This invention discloses a lithium iron manganese phosphate cathode sheet containing a lithium supplement additive and its preparation method. The method includes the following steps: coating an active material slurry onto a blended fiber membrane and drying it; the active material slurry is a slurry formed from cathode active material, binder, and solvent; the blended fiber membrane is obtained by spinning an intermediate pitch phase and a lithium supplement additive. This invention uses a blended fiber membrane of intermediate pitch mixed with a lithium supplement additive as the current collector, which has high electrical and thermal conductivity and excellent mechanical properties; by blending, the lithium supplement additive is anchored in the intermediate pitch phase, which not only enhances the conductivity of the lithium supplement additive, but also avoids the influence of structural changes on the stability of the electrode sheet during delithiation; the high conductivity of NiCoB alloy replaces the conventional carbon material conductive agent, and the reaction of its reducing metal with the oxygen free radicals generated by delithiation of the lithium supplement agent reduces gas production; the local electric field generated by the spin polarization of NiCoB alloy can suppress the John-Teller effect of Mn in lithium iron manganese phosphate and improve cycle stability.
Need to check novelty before this filing date? Find Prior Art