Positive pole piece, preparation method of positive pole piece, secondary lithium battery and battery pack
By adjusting the parameters of the positive electrode active material and conductive agent, ensuring that the conductivity coefficient of the positive electrode coating is within the range of 0.3<Z≤1, the problem of reducing the specific gravity of the conductive agent affecting the conductivity is solved, and the high energy density and good conductivity are achieved.
CN119725376APending Publication Date: 2025-03-28BATTEROTECH CO LTD
0 Cites 1 Cited by
Patent Information
- Application Number
- CN202411874664.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-03-28
AI Technical Summary
Technical Problem
While increasing the specific gravity of the positive electrode active substance in the positive electrode coating to increase the energy density of the battery, the specific gravity of the conductive agent in the positive electrode coating decreases, affecting the conductivity.
Method used
By adjusting the performance parameters of the positive electrode active material and conductive agent, ensure that the conductivity coefficient of the positive electrode coating is within the range of 0.3
Benefits of technology
It is achieved to maintain or improve the conductivity of the positive electrode sheet while increasing the specific gravity of the positive electrode active material, thereby improving the overall performance of the secondary lithium battery.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention provides a positive pole piece, a preparation method of the positive pole piece, a secondary lithium battery and a battery pack. The positive pole piece comprises a positive coating. The positive electrode coating comprises a positive electrode active material and a conductive agent. And the performance parameters of the positive active material and the conductive agent meet the relational expression: # imgabs0 #, wherein Z is more than 0.3 and less than or equal to 1. Wherein Z is the conductivity coefficient of the positive electrode coating, S1 is the specific surface area of the positive electrode active material, S2 is the specific surface area of the conductive agent, R is the resistivity of the conductive agent, and n is the specific gravity of the conductive agent in the positive electrode coating. When the performance parameters of the positive active material and the conductive agent meet the relational expression # imgabs1 # and the conductivity coefficient of the positive coating is greater than 0.3 and less than or equal to 1, the positive coating of the positive pole piece can further improve the specific gravity of the active material in the positive coating while ensuring the conductivity.
Need to check novelty before this filing date? Find Prior Art