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Preparation method of lithium battery diaphragm, lithium battery diaphragm and lithium ion battery

A lithium battery diaphragm and diaphragm technology, which is applied in the direction of separators/films/diaphragms/spacers, secondary batteries, battery pack components, etc., can solve the contradiction between high electron conductivity and mechanical properties, weak cycle stability, Low temperature conductivity and other issues, to achieve the effect of good battery cycle performance, good thermal dimensional stability, and high air permeability

Pending Publication Date: 2017-09-29
宁波柔创纳米科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the main problems of polymer separators are: the contradiction between high electronic conductivity and mechanical properties, poor phase immersion, low low temperature conductivity and weak cycle stability, etc.

Method used

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  • Preparation method of lithium battery diaphragm, lithium battery diaphragm and lithium ion battery
  • Preparation method of lithium battery diaphragm, lithium battery diaphragm and lithium ion battery

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specific Embodiment

[0029] Optimize the above scheme, remove ionized water in the coagulation bath, and control the temperature of the coagulation bath at 65°C. The purpose of removing ionized water is to prevent harmful impurities from affecting the purity of the diaphragm. A coagulation bath with a relatively high temperature facilitates more dispersion during stirring. Quickly and evenly.

[0030] To further optimize the above scheme, the film-making equipment can use a glue leveler, or a coating machine can be used to make a film by coating.

[0031] To further optimize the above scheme, the stirring in step S3 needs to be stirred for 2 hours, so that the dispersion can be more uniform. The high-speed stirring in step S4 needs to use a mixer, and the speed of the mixer is controlled between 8000 ~ 12000r / min, generally using more than 10000r / min Rotational speed for better dispersion.

[0032] Further optimize the above-mentioned scheme, the concentration scope of PAN (polyacrylonitrile) polym...

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Abstract

The invention relates to the field of lithium ion batteries and provides a preparation method of a lithium battery diaphragm. The preparation method comprises the following steps: dissolving a PAN polymer into a first DMF solvent, putting nano cellulose into a second DMF solvent, stirring, and uniformly dispersing; then adding a PVP additive into the first DMF solvent; uniformly mixing the first DMF solvent with the second DMF solvent; removing bubbles in the mixed solution by carrying out vacuum defoaming treatment on the membrane casting solution; and putting the mixed solution with the bubbles removed into membrane preparation equipment, so as to prepare the diaphragm. The preparation method of the lithium battery diaphragm has the advantage that the obtained lithium battery diaphragm has excellent mechanical strength. The invention also provides a lithium battery diaphragm obtained by adopting any of the preparation methods. The lithium battery diaphragm is formed by three layers, wherein a plurality of fingerlike pores are formed in a second layer, and a plurality of air holes are formed in a first layer and a third layer respectively. The invention also provides a lithium ion battery which comprises any of the lithium battery diaphragms and has better cycle performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method of a lithium battery separator, a lithium battery separator and a lithium ion battery. Background technique [0002] Lithium-ion battery is a new type of secondary rechargeable battery. Compared with the currently used alkaline / manganese battery, lead / acid battery and nickel-hydrogen battery, lithium-ion battery has high open circuit voltage, high specific capacity, long cycle life, and safety. Good performance, low self-discharge rate, no memory effect, etc. Especially with the popularization of mobile communication products and the rapid development of portable electronic products, the requirements for the performance of rechargeable batteries are constantly improving. The development of lithium-ion batteries has become a new direction and has attracted widespread attention. [0003] Lithium-ion batteries are mainly composed of positive electrode, nega...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M2/18H01M10/0525B82Y30/00
CPCH01M10/0525B82Y30/00H01M50/44H01M50/403H01M50/463Y02E60/10
Inventor 张宣宣解明胡韬唐建何宇
Owner 宁波柔创纳米科技有限公司
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