Low-moisture ceramic diaphragm, preparation method and lithium battery

A ceramic diaphragm, low-moisture technology, used in lithium batteries, non-aqueous electrolyte batteries, battery pack components, etc., can solve the problems of reducing water content, reducing water content in diaphragms, and high water content in internal components

Inactive Publication Date: 2021-05-18
九江冠力新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on this, the object of the present invention is to provide a low-moisture ceramic diaphragm, a preparation method and a lithium battery, which can not only reduce the water content of the diaphragm itself, but also reduce the water content of other components, thereby solving the excessive water content of the internal components of the lithium battery. The problem

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  • Low-moisture ceramic diaphragm, preparation method and lithium battery
  • Low-moisture ceramic diaphragm, preparation method and lithium battery

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preparation example Construction

[0035] On the other hand, the present invention also provides a preparation method of a low-moisture ceramic diaphragm, comprising the following steps:

[0036] (1) Preparation of CMC-g-AM / SiO 2 : Into the distilled water that is dissolved with CMC and feed nitrogen and add initiator simultaneously, then add AM monomer (acrylamide), crosslinking agent N, N-methylenebisallylamine and silica sol to mix and stir, then stir The reacted product was sequentially saponified, washed, vacuum dried, crushed and ground to obtain CMC-g-AM / SiO 2 ;

[0037] It should be noted that in this step, since the inorganic material silica sol is a highly active adsorption material with a porous structure, and it has many characteristics that other similar materials are difficult to replace: high adsorption performance and good thermal stability, so the silica sol absorbs water. Fast, and can absorb about 40% of its own weight of water, but dehydration usually needs to be carried out at a temperatu...

Embodiment 1

[0054] (1) Preparation of CMC-g-AM / SiO 2 : Add 0.4kg of CMC to a three-necked flask, add an appropriate amount of distilled water to dissolve, stir in a water bath at 50°C for 15 minutes, pass nitrogen and add 40g of initiator; weigh 2kg of AM monomer and put it into a small beaker, add a small amount of Dissolve in distilled water, then add 1g of cross-linking agent N, N-methylenebisallylamine and 0.1kg of silica sol; stir the mixture until it is evenly mixed and fully dissolved, then add it dropwise to the three-necked flask for the above reaction, stir, and react The product was obtained after 3 hours; the product was aged, then saponified by adding an appropriate amount of NaOH at an appropriate water bath temperature, taken out after 30 minutes, washed, vacuum dried, crushed, ground and packed into bags for later use.

[0055] (2) Preparation of low-moisture ceramic slurry: first add 19kg of deionized water to tank A, then add 1kg of CMC-g-AM / SiO to tank A 2 Stir overnig...

Embodiment 2

[0059] (1) Preparation of CMC-g-AM / SiO 2 : Add 1kg of CMC to a three-neck flask, add an appropriate amount of distilled water to dissolve, stir in a water bath at 70°C for 15 minutes, blow nitrogen and add 160g of initiator; weigh 2kg of AM monomer and put it into a small beaker, add a small amount of distilled water Dissolve, then add 4g of cross-linking agent N, N-methylenebisallylamine and 0.4kg of silica sol; stir the mixture until it is evenly mixed and fully dissolved, then drop it into the three-necked flask of the above reaction, stir, and react for 3h Finally, the product is obtained; the product is aged, then saponified by adding an appropriate amount of NaOH at an appropriate water bath temperature, taken out for washing after 30 minutes, vacuum-dried, crushed, ground and packed into bags for later use.

[0060] (2) Preparation of low-moisture ceramic slurry: first add 9kg of deionized water to tank A, then add 1kg of CMC-g-AM / SiO to tank A 2 Stir overnight to make...

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Abstract

The invention discloses a low-moisture ceramic diaphragm, a preparation method and a lithium battery, and the preparation method comprises the following steps of (1) preparing CMC-g-AM / SiO2; 2) preparing low-moisture ceramic slurry; and (3) preparing the low-moisture ceramic diaphragm. According to the invention, the organic-inorganic composite material CMC-g-AM / SiO2 is used for replacing a common thickening agent CMC in slurry and is combined with the inorganic material silica sol to prepare the low-moisture ceramic diaphragm, so that the water content of the prepared low-moisture ceramic diaphragm can be below 500ppm, and extremely low humidity does not need to be controlled during the transportation, packaging and storage of the low-moisture ceramic diaphragm. According to the low-moisture ceramic diaphragm, the water absorption rate of a final product can be controlled by controlling synthesis conditions, so that CMC-g-AM / SiO2 has lower water absorption saturation compared with CMC, and meanwhile, the low-moisture ceramic diaphragm has the characteristics of high water absorption speed and easiness in dehydration when being heated. According to the lithium battery made of the low-moisture ceramic diaphragm, moisture in the lithium battery can be reduced, so that the lithium battery has higher capacity and better cycling stability compared with similar products.

Description

technical field [0001] The invention relates to the technical field of lithium battery diaphragm production, in particular to a low-moisture ceramic diaphragm, a preparation method and a lithium battery. Background technique [0002] With the rapid development of the electric vehicle industry, there is an increasing demand for lithium batteries in the market. Among them, lithium batteries generally include positive electrode materials, negative electrode materials, separators and electrolytes. The separator is one of the key inner components of the lithium battery. Its main function is to separate the positive and negative electrodes of the battery to prevent the short circuit caused by contact between the two electrodes. In addition, it also has the function of allowing electrolyte ions to pass through. At present, conventional polyolefin microporous membranes are widely used as lithium battery separators due to their excellent chemical stability and mechanical strength. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/449H01M50/403H01M10/052
CPCH01M10/052Y02E60/10
Inventor 许成伟张凯
Owner 九江冠力新材料有限公司
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