Composite diaphragm, preparation method thereof and battery
By setting magnetic carbon nanotubes on the lithium-ion battery separator substrate and inducing them to form a specific angle, the problem of uneven lithium-ion deposition was solved, improving the battery's cycle performance and safety.
CN122118301APending Publication Date: 2026-05-29BYD CO LTD
0 Cites 0 Cited by
Patent Information
- Application Number
- CN202411735121.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2026-05-29
AI Technical Summary
Technical Problem
Existing lithium-ion battery separators result in uneven lithium-ion deposition on the negative electrode side, forming lithium dendrites, which affects battery cycle performance and safety.
Method used
Magnetic carbon nanotubes are fabricated on the membrane substrate and induced by a magnetic field to form a specific angle arrangement on the membrane, creating uniform pores and ensuring uniform distribution of lithium ions.
Benefits of technology
This achieves uniform deposition of lithium ions on the negative electrode side, avoids lithium dendrite formation, and improves the cycle efficiency and safety of the battery.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention provides a composite diaphragm and a preparation method thereof, the composite diaphragm comprises a diaphragm substrate and a magnetic carbon nanotube arranged on at least one side of the diaphragm substrate, one end of the magnetic carbon nanotube is connected with the diaphragm substrate, and the other end of the magnetic carbon nanotube extends in a direction far away from the diaphragm substrate; the magnetic carbon nanotube comprises a first magnetic carbon nanotube, and an included angle between the extension direction of the first magnetic carbon nanotube and the diaphragm substrate is 30-90 degrees. When the composite diaphragm is used for assembling a negative-electrode-free battery, lithium metal can be uniformly deposited on the negative electrode side, and the cycle performance of the battery is improved.
Need to check novelty before this filing date? Find Prior Art