Modified silicon dioxide and high-property lithium ion battery diaphragm and application thereof
A lithium-ion battery, silicon dioxide technology, applied in silicon dioxide, silicon oxide, battery pack components and other directions, can solve the problems of complex process, decreased membrane mechanical strength, thick diaphragm thickness, etc., and achieves a simple and easy preparation process. The effect of industrialization and good film strength
Inactive Publication Date: 2012-03-07
中科广化(重庆)新材料研究院有限公司 +3
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Abstract
The invention belongs to the field of lithium ion battery diaphragm materials and discloses modified silicon dioxide and a lithium ion battery polyolefin microporous diaphragm. The diaphragm is prepared by the following method: blending modified silicon dioxide with polyolefin having high/ultrahigh molecular weight, adding common polyolefin, and pelleting so as to obtain modified masterbatch; mixing the modified masterbatch with polyolefin and then carrying out melt blending and extrusion so as to form a diaphragm with a hard elastic structure; and carrying out continuous tension on the diaphragm, and then carrying out heat shaping at the temperature of 100-150 DEG C so as to obtain the lithium ion battery polyolefin microporous diaphragm. According to the invention, the thickness of the lithium ion battery polyolefin microporous diaphragm is relatively low (less than 15mu m); the strength of the diaphragm is better (the longitudinal breaking strength is larger than 100MPa, the transversal breaking strength is about 8MPa, and breaking elongation is 50%); the porosity and pore structure of the diaphragm are adjustable (the porosity is more than 50%, and the pore diameter is 0.1-1mum); and the thermal shrinkage factor of the diaphragm is smaller (less than 5%). According to the invention, the defect and lack of the existing dry preparation technology of the lithium ion battery diaphragm are overcome.
Application Domain
SilicaCell component details
Technology Topic
ChemistryThermal shrinkage +11
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PUM
Property | Measurement | Unit |
Intrinsic viscosity | 15.0 | dl/g |
Intrinsic viscosity | 22.0 | dl/g |
Intrinsic viscosity | 9.0 | dl/g |
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