Preparation method for waterborne polyurethane binder and lithium-ion battery anode slurry containing waterborne polyurethane binder

A water-based polyurethane, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unfriendly environment, cumbersome process, etc., and achieve the effect of excellent bonding performance, simple operation process and good cycle performance.

Inactive Publication Date: 2019-08-20
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN100537694C discloses an ionic WPU used as a positive electrode binder, but it is necessary to add a crosslinking agent to stabilize the prepared positive electrode slurry, which is cumbersome and environmentally unfriendly

Method used

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  • Preparation method for waterborne polyurethane binder and lithium-ion battery anode slurry containing waterborne polyurethane binder
  • Preparation method for waterborne polyurethane binder and lithium-ion battery anode slurry containing waterborne polyurethane binder
  • Preparation method for waterborne polyurethane binder and lithium-ion battery anode slurry containing waterborne polyurethane binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 17.76g isophorone diisocyanate and 40g polyneopentyl adipate diol for later use after vacuum dehydration at 110 ℃ in the four-necked flask that polytetrafluoroethylene stirring rod, spherical condenser and thermometer are housed, After stirring evenly, slowly raise the temperature to (90±2)°C, and react at constant temperature for 2 hours; cool to 50°C with ice water, add 10.6g of trimethylolpropane-polyethylene glycol monomethyl ether, stir evenly, and slowly raise the temperature to (90±2) )°C, react for 1.5h; cool down to 40°C, add 2.4g 1,4-butanediol and 15g acetone and stir evenly, then add a metered amount of catalyst, slowly raise the temperature to (70±2)°C and continue the reaction for 4h; use di-n-butyl The amine-hydrochloric acid titration method determines that the residual -NCO content reaches the theoretical value, which is the end of the reaction, and the temperature is lowered to 40°C to discharge. Under high-speed shearing, 133 g of deionized water ...

Embodiment 2

[0037] Add 22.2g isophorone diisocyanate and 40g polyneopentyl adipate diol for later use after vacuum dehydration at 110 ℃ in the four-necked flask that polytetrafluoroethylene stirring rod, spherical condenser and thermometer are housed, After stirring evenly, slowly raise the temperature to (90±2)°C, and react at a constant temperature for 2 hours; cool to 50°C with ice water, add 11.6g of trimethylolpropane-polyethylene glycol monomethyl ether, stir evenly, and slowly raise the temperature to (90±2) )°C, react for 1.5h; cool down to 40°C, add 3.6g of 1,4-butanediol and 15g of acetone and stir evenly, then add the metered catalyst, slowly raise the temperature to (70±2)°C and continue the reaction for 4h; The amine-hydrochloric acid titration method determines that the residual -NCO content reaches the theoretical value, which is the end of the reaction, and the temperature is lowered to 40°C to discharge. Under high-speed shearing, 146 g of deionized water was added for em...

Embodiment 3

[0041] Add 26.6g isophorone diisocyanate and 40g polyneopentyl glycol adipate diol for later use after vacuum dehydration at 110 ℃ in the four-necked flask that polytetrafluoroethylene stirring rod, spherical condenser and thermometer are housed, After stirring evenly, slowly raise the temperature to (90±2)°C, and react at constant temperature for 2 hours; cool to 50°C with ice water, add 12.6g of trimethylolpropane-polyethylene glycol monomethyl ether, stir evenly, and slowly raise the temperature to (90±2) )°C, react for 1.5h; cool down to 40°C, add 4.7g of 1,4-butanediol and 15g of acetone and stir evenly, then add the metered catalyst, slowly raise the temperature to (70±2)°C and continue the reaction for 4h; The amine-hydrochloric acid titration method determines that the residual -NCO content reaches the theoretical value, which is the end of the reaction, and the temperature is lowered to 40°C to discharge. Under high-speed shearing, 159 g of deionized water was added f...

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Abstract

The invention discloses a preparation method for a waterborne polyurethane binder and a lithium-ion battery anode slurry containing the waterborne polyurethane binder, and relates to the technical field of lithium ions. The preparation method for the waterborne polyurethane binder comprises the following steps: subjecting macromolecular dihydric alcohol to dehydration treatment, mixing dehydratedmacromolecular dihydric alcohol with diisocyanate, carrying out a reaction under heating, then carrying out cooling, adding a side-chain type nonionic hydrophilic monomer, carrying out a reaction under heating, then carrying out cooling, adding a micromolecular chain extender, a catalyst and a solvent, carrying out a reaction under heating, and carrying out cooling and discharging so as to obtaina prepolymer emulsion; and adding water into the prepolymer emulsion, carrying out emulsification under high-speed dispersion, then adding a diamine chain extender, and carrying out pressure-reduced distillation to remove the solvent so as to obtain a waterborne polyurethane emulsion with a side-chain structure. The polyurethane binder prepared by using the preparation method provided by the invention has good flexibility and excellent bonding performance, and is used in an anode slurry; and a button type lithium-ion battery assembled by using the anode slurry has large first discharge capacity and good cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a water-based polyurethane binder and a lithium ion battery cathode slurry comprising the binder. Background technique [0002] In recent years, with the shortage of traditional energy sources and the increasingly serious environmental problems, the development and application of new clean energy sources is imminent. Lithium-ion batteries have many advantages such as high specific energy density, long cycle life, and wide operating voltage platform. They stand out among many new energy sources and have been widely used in the traditional PC field. At the same time, with the development of science and technology, lithium-ion batteries are also gradually Become an important chemical power source for the smart industry. [0003] Lithium-ion batteries are mainly composed of four parts: positive electrode, negative electrode, separator, and elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/12C08G18/32C08G18/40C08G18/42C08G18/44C08G18/48H01M4/62H01M10/0525
CPCC08G18/12C08G18/3206C08G18/4018C08G18/4238C08G18/44C08G18/4812C08G18/4825C08G18/4833C08G18/4854C08G18/6618H01M4/622H01M10/0525C08G18/3228Y02E60/10
Inventor 高明昊夏昕李道聪丁楚雄王庆莉
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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