Secondary battery and electric device

By designing the specific structure of the lithium-philic framework layer and the lithium-repellent framework layer in the negative electrode sheet of the lithium battery, the volume expansion and lithium dendrites of the lithium battery during lithium deposition are solved, and the mechanical strength and cycle life of the battery are improved.

CN119695241APending Publication Date: 2025-03-25SOUTH CHINA UNIV OF TECH
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Patent Information

Application Number
CN202411822625.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

In actual applications, existing lithium metal negative electrodes have problems such as volume expansion and overgrowth of lithium dendrites, which leads to a reduction in the battery cycle life, and the pore structure of the three-dimensional structure is prone to clogging and insufficient mechanical strength.

Method used

A negative electrode sheet including a lithium-philic framework layer and a lithium-philic framework layer is designed. The lithium-philic framework layer is composed of a laminated structure formed by laminating nanosheets. The lithium-philic framework layer is composed of nanowires/rods. The thickness ratio of the two is between (3-20): 1, and the Hermann orientation factor of the laminated structure is 0.6≤f≤0.9.

Benefits of technology

With this structure, it is possible to reduce volume expansion during lithium deposition, inhibit lithium dendrites' growth, improve the mechanical strength and cycle life of the battery, and avoid lithium blockage.

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Abstract

The invention discloses a secondary battery and an electric device, and relates to the technical field of batteries. The invention provides a secondary battery which comprises a negative pole piece, the negative pole piece comprises a lithium-loving framework layer and a lithium-phobic framework layer arranged on the surface of the lithium-loving framework layer, and the thickness ratio of the lithium-phobic framework layer to the lithium-loving framework layer is (1-100): 1; the lithium-loving framework layer comprises a lithium-loving material and a lithium-loving three-dimensional framework loading the lithium-loving material, the lithium-loving three-dimensional framework is of a laminated structure formed by laminating nanosheets, and the Hellman orientation factor of the laminated structure is 0.5 < = flt; 1; and the lithium-phobic framework layer comprises a lithium-phobic three-dimensional framework formed by nanowires / rods. According to the negative pole piece with the specific structure, it is guaranteed that holes cannot be directly blocked on the surface layer during lithium deposition, and lithium can be preferentially deposited at the bottom of the material. And finally, the whole negative pole piece not only has high mechanical strength, but also has the beneficial effects of inhibiting lithium dendrites in long circulation of the battery and prolonging the cycle life of the battery.
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