A preparation method of aramid lithium battery composite separator

A composite diaphragm and lithium battery technology, which is applied in the preparation of spinning solutions, battery pack components, circuits, etc., can solve the problems of battery short circuit, poor electrolyte affinity, poor thermal dimensional stability at high temperature, etc., and improve thermal stability , The preparation process is simple, the effect of high porosity

Inactive Publication Date: 2018-12-14
JIANGXI TONRY NEW ENERGY TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low surface energy of these two polyolefin separators and poor affinity with the electrolyte, the electrolyte / separator interface resistance in the assembled battery is high, which ultimately affects the performance of the battery, and due to the low melting point of the polyolefin material (poly Ethylene is about 140°C, polypropylene is about 160°C), high temperature thermal dimensional stability is poor, and high temperature current interruption performance is poor, resulting in a sharp rise in the internal temperature of the battery under the conditions of high current and high power power battery charging and discharging, making the battery There is a short circuit inside, so there will be a safety hazard when used as a power battery separator

Method used

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  • A preparation method of aramid lithium battery composite separator
  • A preparation method of aramid lithium battery composite separator

Examples

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Embodiment 1

[0018] A preparation method of aramid lithium battery composite diaphragm, comprising the following steps:

[0019] (1) Preparation of N,N-dimethylacetamide / lithium chloride mixed solvent: N,N-dimethylacetamide was dried with 4A molecular sieves and purified by distillation; under nitrogen protection, lithium chloride powder was Add it into N,N-dimethylacetamide, stir with a magnetic stirrer for 10 minutes until completely dissolved, and make N,N-dimethylacetamide / lithium chloride mixed solvent;

[0020] (2) Preparation of PMIA spinning solution: Dry PMIA in a vacuum oven at 120°C for 2 hours, add the dried PMIA to N,N-dimethylacetamide / lithium chloride mixed solvent, and use an oil bath at 80°C Down heating and stirring 10h, until PMIA fiber dissolves completely, PMIA spinning solution promptly prepares; Preparation PMIA concentration is the PMIA spinning solution of 15wt%, wherein the concentration of lithium chloride is 1wt% in the solution;

[0021] (3) Electrospin the pr...

Embodiment 2

[0024] A preparation method of aramid lithium battery composite diaphragm, comprising the following steps:

[0025] (1) Preparation of N,N-dimethylacetamide / lithium chloride mixed solvent: N,N-dimethylacetamide was dried with 4A molecular sieves and purified by distillation; under nitrogen protection, lithium chloride powder was Add it into N,N-dimethylacetamide, stir with a magnetic stirrer for 10 minutes until completely dissolved, and make N,N-dimethylacetamide / lithium chloride mixed solvent;

[0026] (2) Preparation of PMIA spinning solution: Dry PMIA in a vacuum oven at 120°C for 3 hours, add the dried PMIA to the N,N-dimethylacetamide / lithium chloride mixed solvent, and use an oil bath at 80°C Down heating and stirring 10h, until PMIA fiber dissolves completely, PMIA spinning solution promptly prepares; Preparation PMIA concentration is the PMIA spinning solution of 17wt%, wherein the concentration of lithium chloride in the solution is 2wt%;

[0027] (3) Electrospin th...

Embodiment 3

[0030] A preparation method of aramid lithium battery composite diaphragm, comprising the following steps:

[0031] (1) Preparation of N,N-dimethylacetamide / lithium chloride mixed solvent: N,N-dimethylacetamide was dried with 4A molecular sieves and purified by distillation; under nitrogen protection, lithium chloride powder was Add it into N,N-dimethylacetamide, stir with a magnetic stirrer for 10 minutes until completely dissolved, and make N,N-dimethylacetamide / lithium chloride mixed solvent;

[0032] (2) Preparation of PMIA spinning solution: Dry PMIA in a vacuum oven at 120°C for 4 hours, add the dried PMIA to N,N-dimethylacetamide / lithium chloride mixed solvent, and use an oil bath at 80°C Down heating and stirring 10h, until PMIA fiber dissolves completely, PMIA spinning solution promptly prepares; Preparation PMIA concentration is the PMIA spinning solution of 19wt%, wherein the concentration of lithium chloride in the solution is 3wt%;

[0033] (3) Electrospin the pr...

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Abstract

The invention discloses a preparation method of aramid lithium battery composite separator, comprising the following steps: (1) adding lithium chloride powder to N, N-Dimethylacetamide to form N, N-Dimethylacetamide / lithium chloride mixed solvent; (2) adding dried PMIA to N, N-Dimethylacetamide / lithium chloride mixed solvent with 15-25 wt% of a PMIA spinning solution in which the concentration oflithium chloride in the solution is 1-3wt%; (3) electrospinning the prepared PMIA spinning solution, and receiving the PET nonwoven fabric substrate treated with the treatment solution; (4) immersingthe fiber membrane obtained after spinning in ethanol solution at 40 DEG C and standing at 1-3 min, dry, and mechanically rolling to obtain PMIA / PET composite diaphragm. The invention can convenientlyadjust the electrospinning process parameters and effectively change the important characteristics of the membrane such as the porosity, the fiber diameter, the pore diameter, the thickness and the like so as to meet the actual needs in the application, thereby obtaining a lithium ion battery separator with high porosity and high liquid absorption capacity.

Description

technical field [0001] The invention relates to a preparation method of a lithium battery composite diaphragm, which belongs to the technical field of chemical industry. Background technique [0002] At present, polyethylene (PE) and polypropylene (PP) microporous membranes are the most widely used separators for lithium-ion batteries. Due to the low surface energy of these two polyolefin separators and poor affinity with the electrolyte, the electrolyte / separator interface resistance in the assembled battery is high, which ultimately affects the performance of the battery, and due to the low melting point of the polyolefin material (poly Ethylene is about 140°C, polypropylene is about 160°C), high-temperature thermal dimensional stability is poor, and high-temperature current interruption performance is poor, resulting in a sharp rise in the internal temperature of the battery under high-current, high-power power battery charging and discharging conditions, making the batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16D01D1/02D01D5/00D04H1/4342D04H1/728D06M15/263D06M101/36H01M50/403
CPCD01D1/02D01D5/003D01D5/0092D04H1/4342D04H1/728D06B3/10D06M15/263D06M2101/36H01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 梅铜简韦育鲜
Owner JIANGXI TONRY NEW ENERGY TECH DEV CO LTD
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