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Method for manufacturing ceramic diaphragm for high-safety lithium ion battery

A lithium-ion battery, ceramic diaphragm technology, used in secondary batteries, battery pack parts, separators/films/diaphragms/spacers, etc., can solve the problem that the diaphragm cannot be thinner than 16μm, and achieve dimensional stability. , to maintain stability, the effect of stable strength

Inactive Publication Date: 2014-01-15
杨海燕
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In summary, the purpose of the present invention is to solve the technical deficiency that the diaphragm of the existing lithium-ion battery cannot be thinner than 16 μm, and propose a method for manufacturing a ceramic diaphragm for a high-safety lithium-ion battery

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  • Method for manufacturing ceramic diaphragm for high-safety lithium ion battery
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  • Method for manufacturing ceramic diaphragm for high-safety lithium ion battery

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] The preparation method includes the following steps:

[0016] 1) Ingredients, first dissolve PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene) as a binder in NMP (N-methylpyrrolidone) to form a glue with a solid content of 5-10%, and then add it to the glue Add ceramic powder accounting for 1-3% of the weight of the glue into the liquid, and stir to form a suspension, then add acetone while stirring, dilute to a total solid content of 1-3%, and finally pass through a sand mill to form a suspension Standby; the ceramic powder is selected from spherical or spherical ceramic particles with a particle size ranging from 300nm to 700nm. The solvent of the present invention adopts the mixed solution of NMP and acetone, which can keep the stability of the solvent system.

[0017] 2) Coating: Coat the suspension prepared in step 1) on the polyolefin film by dippin...

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Abstract

A method for manufacturing a ceramic diaphragm for a high-safety lithium ion battery relates to the technical field of manufacturing methods of ceramic diaphragms for lithium ion batteries, and overcomes the technical defect that a conventional diaphragm for the lithium ion battery cannot be thinned to be 16 micrometers. The method comprises the following steps: 1) batching: at first, dissolving PVDF-HFP in NMP to form a glue solution with the solid content of 5-10%, then adding ceramic powder accounting for 1-3% of the weight of the glue solution in the glue solution, stirring to form a suspension, and adding acetone while stirring, diluting till the total solid content is 1-3%, and at last, forming a suspension for standby application through a sand grinding machine; 2) coating: coating the prepared suspension from the step 1) on a polyolefine film through adopting an infiltrating and lifting method; 3) curing: at first, preliminarily drying the coated suspension coating at the drying temperature of 50-80 DEG C, and then extracting NMP in an extraction solvent slot to obtain a ceramic layer with the thickness of 2-4 micrometers through stacking. The strength and the size stability of the diaphragm can be kept, the ceramic is a bad thermal conductor; when a certain point of the battery is short-circuited, heat cannot be diffused to the whole battery, without causing fires and explosion.

Description

technical field [0001] The invention relates to the technical field of manufacturing methods of ceramic separators for lithium ion batteries. Background technique [0002] With the popularization and development of smartphone batteries, higher and higher requirements are put forward for the improvement of the energy density of lithium-ion batteries. An important aspect of increasing capacity is to reduce the volume of inactive materials. The use of thin diaphragms is an important direction. When the diaphragm of the existing lithium-ion battery is thinner than 16 μm, the safety performance of the battery such as overcharging, furnace heat, and short circuit is seriously deteriorated. Contents of the invention [0003] In summary, the purpose of the present invention is to solve the technical problem that the existing lithium-ion battery diaphragm cannot be thinner than 16 μm, and propose a method for manufacturing a high-safety lithium-ion battery ceramic diaphragm. [00...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/434H01M50/449
CPCH01M10/0525H01M50/409Y02E60/10
Inventor 黄云李涛
Owner 杨海燕
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