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
CN102195092AInactive Publication Date: 2011-09-21SHENZHEN BAK BATTERY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN BAK BATTERY CO LTD
Publication Date
2011-09-21
Estimated Expiration
Not applicable · inactive patent

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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.
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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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