Lithium ion secondary battery, method for manufacturing the same, and electric device

By introducing carbon nanotube units and organic polymers into the positive electrode of lithium-ion secondary batteries, the problems of insufficient energy density and cycle life in existing technologies have been solved, and the conductivity and the proportion of active materials have been increased, thereby improving the overall performance of the battery.

CN122158655APending Publication Date: 2026-06-05CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2024-12-05
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing lithium-ion rechargeable batteries have shortcomings in improving energy density and cycle life. In particular, improving the conductivity of conductive additives and increasing the proportion of active materials without affecting the battery's charge-discharge performance is a challenge.

Method used

By introducing carbon nanotube units into the positive electrode, organic polymers are attached to the surface of the carbon nanotubes. Acrylic comb polymers are used to improve the dispersibility of carbon nanotubes. Lithium phosphate is combined as the positive electrode active material, reducing the amount of auxiliary dispersant used and increasing the proportion of active material. This results in a uniform dispersion of carbon nanotubes and positive electrode active material, enhancing conductivity.

Benefits of technology

It improves the energy density and cycle life of the battery, reduces the amount of auxiliary dispersant used, and enhances the overall performance of the battery.

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Abstract

The application belongs to the technical field of batteries, and specifically discloses a lithium ion secondary battery, a preparation method thereof and an electric device. The lithium ion secondary battery comprises a positive electrode sheet, and the positive electrode sheet comprises a positive electrode film layer. The positive electrode film layer comprises positive electrode active material and a carbon nanotube unit. The positive electrode active material comprises lithium-containing phosphate, and the carbon nanotube unit comprises carbon nanotubes and an organic polymer on the surface of the carbon nanotubes. The design provided in the application improves the mass ratio of the active material in the electrode sheet and combines the carbon nanotube unit with good conductivity, thereby improving the cycle service life of the battery.
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