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Composite membrane, preparation method of composite membrane, and lithium-ion battery

A technology of composite diaphragm and mixture, which is applied in the direction of composite electrolyte, secondary battery, battery pack components, etc., can solve the problems that it is difficult to improve the charge-discharge cycle performance of lithium-ion batteries with gel polymer electrolyte membranes, and achieve good electrochemical performance. Effects of cycle performance and capacity retention

Inactive Publication Date: 2013-12-25
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, inorganic nanoparticles have extremely high surface energy, it is difficult to form a good combination with the organic PVDF-HFP matrix, and it is easy to form segregation in the polymer matrix, even after ultrasonic oscillation and ball milling, it is difficult to uniformly disperse in PVDF-HFP In the matrix, it is still difficult to improve the charge-discharge cycle performance of lithium-ion batteries using the gel polymer electrolyte membrane

Method used

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  • Composite membrane, preparation method of composite membrane, and lithium-ion battery
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  • Composite membrane, preparation method of composite membrane, and lithium-ion battery

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preparation example Construction

[0016] The embodiment of the present invention provides a preparation method of a composite diaphragm, which comprises the following steps:

[0017] S1, preparing a solution with a nano-sol, the nano-sol is selected from at least one of titanium sol, aluminum sol, silica sol and zirconium sol, the nano-sol contains a MOH group, and M in the MOH group is titanium, aluminum, silicon or zirconium;

[0018] S2, adding a silane coupling agent containing a C=C group and methyl methacrylate (MMA) to the solution, and uniformly mixing to form a first mixture;

[0019] S3, add initiator in this mixture and make MMA and this silane coupling agent polymerize, form polymer, and make this silane coupling agent and this nano-sol take place condensation reaction while polymerizing, thereby this nano-sol is connected on PMMA On the substrate, an inorganic-organic graft hybrid polymer is formed;

[0020] S4, mixing the inorganic-organic graft hybrid polymer with PVDF-HFP in an organic solven...

Embodiment 1

[0051] Mix 10 mL of tetrabutyl titanate with 50 mL of ethanol to form a first solution. Mix deionized water and 50 mL ethanol to form a second solution, and add nitric acid to the second solution to make the pH value 3-4. The molar ratio of deionized water to tetrabutyl titanate is 4:1. The first solution was mixed with the second solution and heated at 65° C. to form a titanium sol solution. The titanium sol solution was heated to 80° C., vinyltrimethoxysilane and MMA monomer were added to the titanium sol solution, and uniformly mixed by stirring to form a first mixture. An initiator, benzoyl peroxide, is added to the first mixture to polymerize MMA and vinyltrimethoxysilane to form the inorganic-organic graft hybrid polymer.

[0052] PVDF-HFP containing 10% inorganic-organic grafted hybrid polymer was dissolved in DMF to form a clear solution with a concentration of 15%. Then the solution was coated on both surfaces of the PE diaphragm, and then the coated diaphragm was ...

Embodiment 2

[0056] The difference from Example 1 is only that tetrabutyl titanate is replaced by aluminum isopropoxide.

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Abstract

The invention relates to a method for preparing a composite membrane. The method comprises the following steps: a solution with nano sol is prepared, and the nano sol is selected from at least one of titanium sol, alumina sol, silica sol and zirconium sol; a silane coupling agent and methyl methacrylate are added to the solution; the solution is uniformly mixed to form a first mixture; an initiator is added to the mixture to polymerize the methyl methacrylate and the silane coupling agent while the silane coupling agent and the nano sol-gel generates condensation reaction, therefore the nano sol is grafted on a polymethyl methacrylate substrate to form an inorganic-organic grafted hybrid polymer; the inorganic-organic grafted hybrid polymer is mixed with a copolymer of vinylidene fluoride and hexafluoropropylene in an organic solvent to form a uniform second mixture; the second mixture is spread onto the surface of a porous polyolefin membrane; the porous polyolefin membrane coated with the second mixture is dried. The invention further relates to the composite membrane and a lithium-ion battery.

Description

technical field [0001] The invention relates to a composite diaphragm for lithium ion batteries, a preparation method thereof, and a lithium ion battery using the composite diaphragm. Background technique [0002] In lithium-ion batteries, the use of solid electrolytes has the advantages of less leakage, safety, and easy installation compared to liquid electrolytes, but the low ion mobility of solid electrolytes limits their application in actual production. Therefore, gel polymer electrolytes that combine the advantages of both liquid and solid electrolytes have been developed. The ionic conductivity of the gel polymer electrolyte is about 10 -3 S?cm -1 , better than solid electrolytes. However, the existing gel polymer electrolytes still have the defects of poor mechanical strength and poor electrode-electrolyte interface stability, which makes batteries using gel polymer electrolytes still suffer from poor battery cycle performance and safety performance. [0003] In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/403H01M50/446H01M50/449
CPCH01M10/0525H01M2300/0088C08J2323/02C08J2427/16C08J2427/20C08J2451/06C08J7/0427Y02E60/10H01M50/449H01M50/403
Inventor 曹江何向明王莉尚玉明李建军赵鹏杨聚平
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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