Phenol lithium polymer positive electrode material and preparation method thereof

The preparation of phenol lithium polymer positive electrode material through polycondensation of phenol and aldehydes has solved the problems of low capacity of the positive electrode material and poor circulation performance of the organic positive electrode material in the existing lithium battery, and achieved high energy density and good rate performance, which is suitable for solid-state batteries.

CN119725528APending Publication Date: 2025-03-28SHANDONG SENJIU BIOMATERIALS CO LTD
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Patent Information

Application Number
CN202510016656.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-06
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing lithium battery positive electrode material has low capacity and poor circulation performance in liquid electrolyte, making it difficult to apply to solid-state batteries with high energy density.

Method used

The phenol lithium polymer positive electrode material is prepared by polycondensation of phenol and aldehydes and the hydrogen ions on the phenol hydroxyl group are replaced with lithium ions. The preparation method of the material includes mixing the phenol-based compound with the lithium compound, adding an aldehyde-based compound and a solvent, reacting and filtration, adding a conductive agent and a dispersing agent to finally obtain a phenol-based lithium polymer positive electrode material.

Benefits of technology

The phenol lithium polymer positive electrode material has high charge and discharge capacity and is suitable for use in solid-state batteries with high energy density. Its structure contains less oxygen and has good flame retardant performance, reducing the risk of battery fire. At the same time, the formation of microporous channels facilitates the diffusion of lithium ions, improving rate performance and cycling stability.

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Abstract

The invention discloses a phenol lithium polymer positive electrode material and a preparation method thereof, and belongs to the technical field of positive electrode materials, the positive electrode material adopts condensation of phenol lithium and aldehyde to obtain a polymer active substance, and in the charging and discharging process, conversion between phenol lithium and quinonyl is realized by obtaining and losing lithium ions; compared with a common ternary lithium positive electrode material or lithium iron phosphate in the existing market, the phenol lithium polymer positive electrode material disclosed by the invention has higher specific discharge capacity which reaches 280mAh / g, and meanwhile, the average discharge voltage of 2.8 V is reached; the energy density of the solid-state battery prepared by matching the positive pole piece prepared from the phenol lithium polymer with the solid-state electrolyte exceeds 350mWh / g; and the capacity retention ratio is greater than 95% after 500 cycles of cyclic charge and discharge.
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