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In-situ heat cross bonding process for preparing fluorine containing gel state electrolyte material and process for making polymeric lithium ion cell

An electrolyte material, lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of leakage, corrosion and combustion, poor electrolyte capacity, electrolyte leakage, etc., to avoid leakage, The effect of low internal resistance and simple preparation method

Inactive Publication Date: 2004-12-29
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of liquid lithium-ion batteries is the use of organic solutions that are volatile, flammable, and easy to flow and thus easy to leak. If used improperly, it may cause dangers such as leakage, corrosion, and combustion. All use metal material as the shell to improve safety
Polymer lithium-ion battery simplifies the packaging of the battery case, making it possible to have large-area, ultra-thin, various shapes and high energy density lithium-ion batteries, and is widely used in a new generation of portable electronic devices as energy devices, but This kind of battery production process requires a complex and high-cost polymer electrolyte membrane manufacturing process, which has become a technical bottleneck in the manufacture of polymer lithium-ion batteries.
[0004] Electrolyte materials with a gel-state fluorine-containing polymer network structure have the characteristics of stable electrochemical performance, but the ability of the fluorine-containing polymer network to wrap the electrolyte is poor, and electrolyte leakage will occur after long-term storage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041]Example 1 In-situ thermal crosslinking method prepares fluorine-containing gel state electrolyte material and the manufacture method 1 of polymer lithium ion battery

[0042] Trifluoroethyl methacrylate (H 2 C=C(CH 3 )CO 2 CH 2 CF 3 ): 10Wt%;

[0043] Ethylene glycol dimethacrylate (H 2 C=C(CH 3 )CO 2 (CH 2 CH 2 O) 1 OCC (CH 3 )=CH 2 ): 3Wt%;

[0044] Dibenzoyl peroxide ((C 6 h 5 CO 2 ) 2 , BPO): 0.25Wt%;

[0045] Electrolyte, 1M liPF 6 , EC / DEC / VC=1 / 1 / 0.1 (W / W / W): 86.75Wt%.

[0046] In a dry environment (relative humidity lower than 2%) and room temperature, the mixed solution is prepared according to the above weight percentage. The mixed solution should be transparent and have good fluidity. Use the vacuum injection method to inject the mixed solution into the battery body containing the battery core (the battery core contains positive electrode strips, negative electrode strips, separators and positive and negative tabs) to make the positive elect...

example 2

[0047] Example 2 In-situ thermal cross-linking method to prepare fluorine-containing gel state electrolyte material and the manufacture method 2 of polymer lithium ion battery

[0048] Tetrafluoropropyl methacrylate (H 2 C=C(CH 3 )CO 2 CH 2 CF 2 CHF 2 ): 8Wt%;

[0049] Triethylene glycol dimethacrylate (CH 2 =C(CH 3 )CO 2 (CH 2 CH 2 O) 3 OCC (CH 3 )=CH 2 ): 3Wt%;

[0050] Azobisisobutyronitrile ((CH 3 (CH 3 )C(CN)N) 2 , AIBN): 0.3Wt%;

[0051] Electrolyte, 1M liPF 6 , EC / DEC=1 / 1 (W / W): 88.7Wt%.

[0052] In a dry environment (relative humidity lower than 2%) and room temperature, the mixed solution is prepared according to the above weight percentage. The mixed solution should be transparent and have good fluidity. Use the vacuum injection method to inject the mixed solution into the battery body containing the battery core (the battery core contains positive electrode strips, negative electrode strips, separators and positive and negative tabs) to make the ...

example 3

[0053] Example 3 In-situ thermal crosslinking method prepares fluorine-containing gel state electrolyte material and the manufacturing method 3 of polymer lithium ion battery

[0054] Pentafluoropropyl methacrylate (H 2 C=C(CH 3 )CO 2 CH 2 CF 2 CF 3 ): 10wt%;

[0055] Ethoxylated trimethylolpropane triacrylate (7 / 3 EO / OH TMPTA): 2.25Wt%;

[0056] Bis(4-tert-butylcyclohexyl)peroxydicarbonate (((CH 3 ) 3 CC 6 h 10 OCO 2 ) 2 ): 0.25Wt%;

[0057] Electrolyte, 1M liPF 6 , EC / DEC / DMC=1 / 1 / 1 (W / W / W): 87.5Wt%.

[0058] In a dry environment (relative humidity lower than 2%) and room temperature, the mixed solution is prepared according to the above weight percentage. The mixed solution should be transparent and have good fluidity. Use the vacuum injection method to inject the mixed solution into the battery body containing the battery core (the battery core contains positive electrode strips, negative electrode strips, separators and positive and negative tabs) to make th...

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Abstract

The invention provides a method of making fluorine-containing gel state electrolyte material and polymeric lithium ion cells by employing in-situ thermal cross bonding process, wherein fluorine-containing acrylic ester material is used as monomer, and double functional group acrylic acid ester containing polyethylene glycol or triple functional group acrylic acid ester containing polyethylene glycol are used as cross linking agent, the making process comprises injecting the miscible liquid comprising monomer, cross linking agent, thermal initiation agent and lithium ion electrolyte salt solution into the core of lithium ion cells, heating the cell to result in-situ thermal chemical cross-linking for the two acrylic esters, whereby the acrylic ester copolymer network bundles the solution in the electrolyte, forming the gel state electrolyte material with stabilized physical and chemical properties.

Description

technical field [0001] The invention belongs to a fluorine-containing gel state electrolyte material of a polymer lithium ion battery and a manufacturing method thereof. Background technique [0002] At present, liquid electrolyte lithium-ion batteries can be produced in large quantities at home and abroad. Liquid electrolyte lithium-ion batteries use organic electrolytes containing lithium salts. Its composition is mainly composed of ethylmethyl carbonate (EMC), C 4 h 8 o 3 ), ethylene carbonate (ethylenecarbonate (EC), C 3 h 4 o 3 ), diethyl carbonate (DEC), C 5 h 10 o 3 ), dimethyl carbonate (dimethyl carbonate (DMC), C 3 h 6 o 3 ), propylene carbonate (propylenecarbonate (PC), C 4 h 6 o 3 ) and vinylene carbonate (vinylene carbonate (VC), C 3 h 2 o 3 ) and other organic solvents and various inorganic lithium salts such as LiCF 3 SO 3 , LiN(CF 3 SO 2 ) 2 , LiC(CF 3 SO 2 ) 3 、LiPF 6 、LiBF 4 , LiAsF 6 and LiClO 4 The prepared solution is the elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCY02E60/122Y02E60/10
Inventor 杨清河邱玮丽马晓华付延鲍
Owner FUDAN UNIV
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