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Gel polymer lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and gel polymers, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., can solve the problem of complex extraction process of plasticizers, which is difficult to popularize and apply on a large scale, battery Yield decline and other problems, to achieve the effect of excellent performance such as high temperature, small increase in internal resistance of the battery cell, and easy control of the manufacturing process

Inactive Publication Date: 2011-09-21
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Bellcore technology is very complicated. It is necessary to dissolve polyvinylidene fluoride-hexafluoropropylene P (VDF-HFP), then add a large amount of plasticizer dibutyl phthalate (DBP) and silica particles, and then coat Make a P(VDF-HFP) film on the substrate, and then extract the plasticizer with a large amount of low-boiling point solvent (such as methanol) to obtain a microporous film, and finally roll the microporous film and the electrode layer and combine it in a drying room Inject a liquid electrolyte into the battery to activate it to obtain a polymer lithium-ion battery
The biggest disadvantage of this technology is that the process is too complicated, the production cost is extremely high, the extraction process of the plasticizer is complicated and difficult to control, and the thermal compounding process is prone to micro-short circuit, which leads to a decrease in the battery yield, so it is difficult to popularize and apply it on a large scale.

Method used

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  • Gel polymer lithium ion battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] 100.00 g of P(VDF-HFP) powder with a mass ratio of HFP:VDF of 15:100 was dissolved in 4.35 kg of tetrahydrofuran and 0.5 Kg of dimethyl sulfoxide to prepare a P(VDF-HFP) solution. 20.00gSiO 2 The ultrafine powder is dispersed in the above P(VDF-HFP) solution and mixed evenly. Then slowly inject 50.00 g of dimethyl carbonate, stir evenly, and age to prepare a separator coating slurry.

[0027] The membrane coating slurry obtained above was coated on the surface of the base membrane by a spraying method, and then baked and dried at 55° C. to prepare a porous composite membrane. Assemble the above-mentioned porous composite diaphragm and positive and negative electrode sheets into a 303443P (380mAh) battery, inject liquid lithium salt electrolyte, and bake the battery for 8.0 hours at a pressure of 0.7MPa and a temperature of 75°C after aging, and then perform a After pre-charging, aging, and capacity separation, a gel polymer battery is made, and the cell number is cell...

Embodiment 2

[0029] 250.00 g of P(VDF-HFP) powder with a HFP:VDF mass ratio of 12:100 was dissolved in 4.43 kg of acetone to prepare a P(VDF-HFP) solution. Add 25.00g Al 2 o 3 The ultrafine powder is dispersed in the above P(VDF-HFP) solution and mixed evenly. Then slowly inject 300.00 g of deionized water, stir evenly, and age to prepare a membrane coating slurry.

[0030] The membrane coating slurry obtained above is coated on the surface of the base membrane by a dip coating method, and after being dried at room temperature, a porous composite membrane is prepared. Assemble the above-mentioned porous composite diaphragm and positive and negative electrode sheets into a 303443P (380mAh) battery, inject liquid electrolyte, precharge the battery cell after aging, and then bake the battery at 85°C for 5.0 hours with a pressure of 0.4MPa. h, after aging and capacity-dividing the battery cell, a gel polymer battery is made, and the battery cell number is cell 2. The measured internal resi...

Embodiment 3

[0032] 500.00 g of P(VDF-HFP) powder with a mass ratio of HFP:VDF of 20:100 was dissolved in 3.75 kg of butanone to prepare a P(VDF-HFP) solution. Then 450.00gZrO 2 The ultrafine powder is dispersed in the above P(VDF-HFP) solution and mixed evenly. Then slowly inject a mixture of 100.00 g of n-butanol, 100 g of diethyl carbonate and 100 g of methyl propyl carbonate, stir evenly and then age to prepare a separator coating slurry.

[0033] The membrane coating slurry obtained above was coated on the surface of the base membrane by a roller coating method, and after being baked and dried at 50° C., a porous composite membrane was prepared. Assemble the above-mentioned porous composite diaphragm and positive and negative electrode sheets into a 303443P (380mAh) battery, then inject liquid lithium salt electrolyte, precharge the battery cell after aging, and then dry the battery at a pressure of 1.0MPa and a temperature of 65°C Baking for 10.0 hours, after aging and capacity sep...

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Abstract

The invention discloses a gel polymer lithium ion battery and a preparation method thereof. The preparation method comprises the following steps: step (a), dissolving P (VDF-HFP) powder into an organic solvent to configure a P (VDF-HFP) solution; step (b), adding and dispersing inorganic micropowder into the P (VDF-HFP) solution; step (c), adding a non-solvent containing P (VDF-HFP) into the mixture obtained in the step (b), followed by fully mixing so as to make a diaphragm coating slurry; step (d), uniformly coating a substrate diaphragm with the diaphragm coating slurry, and performing drying so as to obtain a porous composite diaphragm; and step (e), assembling an electrical core with the porous composite diaphragm that is obtained in the step (d), a positive plate and a negative plate, and injecting a liquid electrolyte containing a lithium salt into the assembled electrical core; and then pressurizing, heating and baking the electrical core to obtain a gel polymer lithium ion battery. The gel polymer lithium ion battery provided in the invention has a simple preparation method and the process for making the gel polymer lithium ion battery is easy to control; besides, the battery has good performance.

Description

technical field [0001] The invention relates to the field of battery manufacturing, in particular to a gel polymer lithium ion battery and a preparation method thereof. Background technique [0002] Due to its high operating voltage, high energy density, and long cycle life, lithium-ion batteries have been widely used in various mobile digital products after nearly ten years of development, and have gradually developed into the field of electric vehicles, becoming HEV and EV one of the main power supplies. [0003] At present, most lithium-ion batteries are liquid lithium-ion batteries. The liquid electrolyte is composed of lithium salts dissolved in organic solvents such as carbonates, which may cause battery swelling, leakage, and thermal runaway, which may lead to safety accidents. Solid-state lithium-ion batteries can completely solve the above problems due to the use of solid-state electrolytes, but the conductivity of solid-state electrolytes is extremely low, making ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M2/16H01M10/0525
CPCY02E60/12Y02E60/122Y02E60/10Y02P70/50
Inventor 姚彩芳桑成涛孙鸿飞赵佩云
Owner SHENZHEN BAK BATTERY CO LTD
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