A negative thick electrode and a secondary battery using the same

CN117012903BActive Publication Date: 2026-07-07EVE POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
EVE POWER CO LTD
Filing Date
2023-06-29
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing thick electrode systems struggle to reduce the proportion of inactive materials while maintaining the performance of active materials, making them prone to cracking and delamination. This affects electrolyte penetration and ion transport, leading to a decline in battery rate performance and cycle performance. Furthermore, graphite anodes experience a decrease in porosity and lithium plating issues due to volume shrinkage during charge and discharge.

Method used

By employing a carbon black and hollow carbon fiber composite conductive agent system, and controlling its mass percentage, particle size, and specific surface area, the balance between electronic and ion conduction is optimized to form long-range and short-range conductive structures, thereby improving porosity and lithium-ion transport channels and enhancing battery performance.

Benefits of technology

It improves the rate performance and cycle performance of the battery, reduces dead pores in the electrodes, promotes electrolyte wetting, reduces ionic impedance, and improves the battery's kinetic performance and polarization.

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    Figure CN117012903B_ABST
Patent Text Reader

Abstract

The application provides a negative thick electrode and a secondary battery using the same, the negative thick electrode comprising a negative current collector and a negative slurry layer arranged on the surface of the negative current collector, the negative slurry layer comprising carbon black, hollow carbon fibers and graphite; in the negative slurry layer, the following relationship is satisfied: the application introduces a composite conductive agent system formed by the hollow carbon fibers and the carbon black in the negative slurry, by controlling the mass percentage, particle size and specific surface area of the carbon black and the hollow carbon fibers in the negative slurry, the balance of the electronic conduction and the ionic conduction in the negative system can be coordinated, the rapid transmission of the interface ions and electrons of the battery is facilitated, and the rate discharge performance and the cycle performance are improved.
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