Composite diaphragm for lithium ion battery and preparation method thereof
A technology of lithium-ion batteries and composite diaphragms, which is applied to battery components, circuits, electrical components, etc., can solve the problems of high crystallinity of pure PVDF materials, poor stability of bound electrolytes, and low ion conductivity, so as to improve comprehensive performance , low production cost, simple and safe operation
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[0019] example 1:
[0020] 1) Mix 4g of polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) and 1g of polydimethylsiloxane (PDMS) at room temperature, and add 10g of dimethyl phthalate (DMP) ) And 10g of N,N-dimethylacetamide (DMAc) diluent, stirred at 60°C for 6 hours to obtain a uniform mixed system.
[0021] 2) Add 0.25g of 1,2-propanediol and 0.25g of glycerol dispersant to the mixed system, stir at room temperature for 2 hours, and further disperse and dilute the blended materials to obtain a blend of PVDF-HFP and PDMS with uniform properties Things.
[0022] 3) Coat the PVDF-HFP / PDMS blend uniformly on a glass plate with a film thickness of 80μm. After standing at room temperature for 10 seconds, wash with 25g of 10% (volume percentage) ethanol solution for three times, and then at room temperature The glass plate was immersed in 75g of 10% (volume percentage) ethanol solution for 48 hours to remove the diluent and dispersant, and then vacuum dried at 40°C for 48...
Example
[0028] Example 2:
[0029] 1) Mix 4.5g PVDF-HFP and 0.5g PDMS uniformly at room temperature, add 15g DMAc diluent, and stir at 60°C for 6 hours to obtain a homogeneous mixed system.
[0030] 2) Add 0.5g of isopropanol or glycerol dispersant to the mixing system, stir at room temperature for 2 hours, and further disperse and dilute the blended materials to obtain a PVDF-HFP and PDMS blend with uniform properties.
[0031] 3) Coat the blend of PVDF-HFP and PDMS uniformly on the glass plate with a thickness of 100μm. After standing at room temperature for 15 seconds, wash with 35g 10% (volume percentage) ethanol solution for three times, and then at room temperature. The glass plate was immersed in 75g of 10% (volume percentage) ethanol solution for 48 hours to remove the diluent and dispersant, and then vacuum dried at 40°C for 48 hours to obtain a PVDF-HFP and PDMS composite diaphragm for lithium ion batteries.
[0032] 4) After testing, the characteristics of the composite diaphragm m...
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