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Electrolyte compound of multilayer gel, and prepartion method for applied to lithium ion battery

A lithium ion battery, gel electrolyte technology, applied in the field of multi-layer gel electrolyte composite, lithium ion battery preparation, can solve the electrode/gel electrolyte interface tightness damage, affect battery voltage and cycle performance, metal lithium Sedimentation safety accidents and other issues

Inactive Publication Date: 2007-02-21
TIANJIN CHEM RES & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with this method, the solvent in the electrolyte will decompose and generate gas during the charging and discharging process of the battery, which will destroy the tightness of the electrode / gel electrolyte interface, thereby affecting the voltage and cycle performance of the battery, and even causing the deposition of lithium metal. a safety accident

Method used

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  • Electrolyte compound of multilayer gel, and prepartion method for applied to lithium ion battery
  • Electrolyte compound of multilayer gel, and prepartion method for applied to lithium ion battery
  • Electrolyte compound of multilayer gel, and prepartion method for applied to lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of electrode adhesion layer:

[0031] In a glove box filled with dry argon, take a certain amount of lithium polyacrylate (number-average molecular weight 30,000) and prepare a 50% colloidal solution with anhydrous methanol, and apply it evenly on the surface of the positive and negative electrodes with a spatula, and wait for the methanol to naturally After volatilization, it was dried in a vacuum oven at 80°C for 8 hours. The processed electrodes are made into semi-finished batteries according to the conventional process, and placed in aluminum-plastic packaging bags.

[0032] (2) Preparation of gel electrolyte layer

[0033] The formula (% by weight %) of gel electrolyte:

[0034] Methyl methacrylate: 15%

[0035] Low molecular weight polymer: 8%

[0036] Polyethylene glycol (200) diacrylate: 2%

[0037] Dibenzoyl peroxide: 0.1%

[0038] Non-aqueous electrolyte: 74.9% (1M LiPF 6 , ethylene carbonate: propylene carbonate: ethyl methyl carbonate ...

Embodiment 2

[0043] (1) Preparation of electrode adhesion layer:

[0044]In a glove box filled with dry argon, take a certain amount of polylithium methacrylate (number average molecular weight 50,000) and prepare a 60% colloidal solution with anhydrous methanol, and apply it evenly on the surface of the positive and negative electrodes with a spatula. After the methanol volatilized naturally, it was dried in a vacuum oven at 80°C for 8 hours. The processed electrodes are made into semi-finished batteries according to the conventional process, and placed in aluminum-plastic packaging bags.

[0045] (2) Preparation of gel electrolyte layer

[0046] The formula (% by weight %) of gel electrolyte:

[0047] Methyl methacrylate: 4%

[0048] Low molecular weight polymer: 3%

[0049] Polyethylene glycol (200) diacrylate: 3%

[0050] Dibenzoyl peroxide: 0.1%

[0051] Non-aqueous electrolyte: 89.9% (1M LiPF 6 , ethylene carbonate: propylene carbonate: ethyl methyl carbonate = 1:1:1, weight r...

Embodiment 3

[0056] (1) Preparation of electrode adhesion layer:

[0057] In a glove box filled with dry argon, take a certain amount of polyethylene glycol lithium (number-average molecular weight 60,000) and prepare a 70% colloidal solution with anhydrous methanol, and apply it evenly on the surface of the positive and negative electrodes with a spatula. After the methanol volatilized naturally, it was dried in a vacuum oven at 80°C for 8 hours. The processed electrodes are made into semi-finished batteries according to the conventional process, and placed in aluminum-plastic packaging bags.

[0058] (2) Preparation of gel electrolyte layer

[0059] The formula (% by weight %) of gel electrolyte:

[0060] Methyl methacrylate: 2.5%

[0061] Low molecular weight polymer: 5%

[0062] Polyethylene glycol (200) diacrylate: 2%

[0063] Dibenzoyl peroxide: 0.1%

[0064] Non-aqueous electrolyte: 90.4% (1M LiPF 6 , ethylene carbonate: propylene carbonate: ethyl methyl carbonate = 1:1:1, we...

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Abstract

Characters of the method are that electroconductive polymer of containing lithium ions is painted on surface of electrode of lithium ion battery; then, gel electrolyte of containing monomer of unsaturated esters, polymer in low molecular weight, crosslinking agent, thermal booster, and nonaqueous electrolyte is injected to surface of electrode; interpenetrating networks type structure of electrolyte compound of gel in multiplayer is formed through reaction of thermal polymerization and intermittent autoclave. The invention makes lithium ion battery possesses better bonding strength of electrode / electrolyte, as well as better cycle life. Moreover, the invention also restrains metal lithium to be deposited on surface of negative pole in certain degree.

Description

technical field [0001] The invention relates to a lithium ion battery and electrolyte preparation technology, in particular to a multi-layer gel electrolyte composite and a preparation method applied to a lithium ion battery. Background technique [0002] Since its commercialization in the early 1990s, lithium-ion batteries have gradually replaced traditional secondary batteries and become the mainstream of the market due to their advantages such as high voltage, large capacity, and light weight, and have been widely used in mobile electronic products such as portable devices and handheld devices. application. Due to safety hazards such as leakage of lithium-ion batteries using liquid electrolytes, the safety performance of batteries is greatly reduced. Therefore, the use of polymer electrolytes has become one of the important directions for the development of lithium-ion batteries today. The use of polymer electrolyte can not only avoid the leakage of electrolyte, but also...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/0565H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 刘大凡刘锦平赵庆云
Owner TIANJIN CHEM RES & DESIGN INST