Nonaqueous electrolyte secondary battery

CN119318025APending Publication Date: 2025-01-14PANASONIC ENERGY CO LTD
View PDF 1 Cites 0 Cited by

Patent Information

Application Number
CN202380048034.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2022-06-29
Filing Date
2023-06-22
Publication Date
2025-01-14

AI Technical Summary

Technical Problem

The existing non-aqueous electrolyte secondary batteries have problems of degradation in charge and discharge cycle characteristics, and there is a lack of improvement measures.

Method used

By using two negative electrode active substances M1 and M2 with different volume average particle sizes in the negative electrode mixture layer, and controlling the interparticle void ratio, the first negative electrode mixture layer and the second negative electrode mixture layer are formed to ensure the second negative electrode mixture layer The interparticle void ratio (S2) is in the range of 3.5 to 5.0 with respect to the interparticle void ratio (S1) of the first negative electrode mixture layer, thereby increasing the permeability and adhesion of the electrolyte, thereby suppressing the reduction of charge and discharge cycle characteristics.

Benefits of technology

It effectively improves the charge and discharge cycle characteristics of the nonaqueous electrolyte secondary battery, extends the service life of the battery and improves the capacity retention rate.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN119318025A_ABST
    Figure CN119318025A_ABST
Patent Text Reader

Abstract

A non-aqueous electrolyte secondary battery is provided with a negative electrode (12) having a negative electrode mixture layer (32) formed on the surface of a negative electrode collector (30), the negative electrode mixture layer (32) having a first negative electrode mixture layer (32a) and a second negative electrode mixture layer (32b), the first negative electrode mixture layer (32a) and the second negative electrode mixture layer (32b) containing a negative electrode active material, the negative electrode active material in the first negative electrode mixture layer (32a) comprises two negative electrode active materials (M1 and M2) having different volume average particle diameters, and the ratio (A2 / A1) of the volume average particle diameter (A2) of the negative electrode active material (M2) to the volume average particle diameter (A1) of the negative electrode active material (M1) is in the range of 0.16-0.5. The ratio (S2 / S1) of the inter-particle porosity (S2) of the negative electrode active material in the second negative electrode mixture layer (32b) to the inter-particle porosity (S1) of the negative electrode active material in the first negative electrode mixture layer (32a) is in the range of 3.5-5.0.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Lithium secondary battery and its manufacturing method

    JP2003077463A