Ceramic diaphragm for lithium ion battery and preparation method of ceramic diaphragm
A lithium-ion battery, ceramic separator technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of limited liquid absorption capacity, weak binding force between ceramic particles and binders, and easy to fall off powder. Enhanced stability, enhanced binding force, and the effect of preventing powder drop
Inactive Publication Date: 2016-04-20
TIANNENG SAFT ENERGY JOINT CO
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The invention discloses a ceramic diaphragm for a lithium ion battery. The ceramic diaphragm comprises a diaphragm base material and a ceramic coating on the surface of the diaphragm base material, wherein ceramic particles having a porous structure and a high specific surface area are selected for the ceramic coating. A preparation method includes the following steps of firstly, evenly mixing ceramic particles, binder and solvent to obtain coating slurry; secondly, evenly coating the surface of the diaphragm base material with the coating slurry, and conducting drying to form the ceramic diaphragm. Quite strong binding force exists between the porous ceramic powder and the binder, and the powder falling phenomenon is effectively avoided; meanwhile, the ceramic diaphragm has high electrolyte wettability and quite strong liquid absorption capacity, the cycle life and rate capability of the lithium ion battery are increased, and excellent electrochemical performance is achieved; in addition, under the same thickness, the mass of the porous ceramic coating is far lower than that of an ordinary ceramic coating, and the energy density of the battery is improved.
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Property | Measurement | Unit |
Specific surface area | >= 200.0 | m²/g |
Particle size | 20.0 | nm |
Thickness | 1.0 ~ 10.0 | µm |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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