Preparation method of high-energy-storage battery diaphragm material

A battery diaphragm and high energy storage technology, which is applied in the direction of battery pack parts, circuits, electrical components, etc., can solve the problems of diaphragm performance degradation, combustible fire disasters, damage, etc., and achieve improved mechanical strength and thermal stability. Mechanical strength and the effect of improving safety performance

Active Publication Date: 2020-05-15
四川优源新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polyolefin microporous membranes have been commercially produced, due to the nature of polyolefin itself, polyolefin microporous membranes have problems such as low mechanical strength and poor wettability, and once the battery is overheated, the microporous membrane Shrinkage and deformation will occur, causing the positive electrode material and the negative electrode material to contact and short circuit occurs. Once the battery short circuit occurs, it is easy to ignite the surrounding combustibles and cause a fire disaster.
The existing methods of modifying polyolefin microporous membranes with inorganic materials mostly use inorganic materials to coat the surface of microporous membranes, and a few use inorganic materials to blend with microporous

Method used

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  • Preparation method of high-energy-storage battery diaphragm material

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Effect test

Embodiment 1

[0027] A preparation method of high energy storage battery diaphragm material, comprising the following steps:

[0028] S1. Add LDPE and xylene to 170g LDPE per liter of xylene into the reaction vessel, heat and stir to dissolve LDPE completely, when the temperature rises to 110°C, add DCP at 0.05% of the mass of LDPE, DCP is pre-dissolved with xylene to prepare a solution After adding DCP, keep it warm for 4 hours and then stop the reaction. When the temperature drops to room temperature, add ethanol to the system in the amount of 1L of ethanol per 200g LDPE, stir for 30 minutes, and the product precipitates, then suction filter and wash with acetone for 3-5 times, at 70°C Dried to constant weight to obtain maleic anhydride grafted polyethylene product;

[0029] S2, the maleic anhydride grafted polyethylene is completely dissolved in butyl acetate, the butyl acetate of every 100g maleic anhydride grafted polyethylene needs to be 0.8L, obtains the maleic anhydride grafted poly...

Embodiment 2

[0036] A preparation method of high energy storage battery diaphragm material, comprising the following steps:

[0037] S1. Add LDPE and xylene to 180g LDPE per liter of xylene into the reaction vessel, heat and stir to dissolve LDPE completely, when the temperature rises to 115°C, add DCP at 0.055% of the mass of LDPE, DCP is prepared by dissolving xylene in advance Solution, after adding DCP, keep it warm for 4.5h and then stop the reaction. When the temperature drops to room temperature, add ethanol to the system according to the amount of 1L of ethanol per 200g LDPE, stir for 45min, the product precipitates out, suction filter and wash with acetone for 3-5 times, Dry at 75°C to constant weight to obtain maleic anhydride grafted polyethylene product;

[0038] S2, the maleic anhydride grafted polyethylene is completely dissolved in butyl acetate, the butyl acetate of every 100g maleic anhydride grafted polyethylene needs to be 1.2L, obtains the maleic anhydride grafted polye...

Embodiment 3

[0045] A preparation method of high energy storage battery diaphragm material, comprising the following steps:

[0046] S1. Add LDPE and xylene to 190g LDPE per liter of xylene into the reaction vessel, heat and stir to dissolve LDPE completely, when the temperature rises to 120°C, add DCP according to 0.06% of the mass of LDPE, DCP is pre-dissolved with xylene to prepare a solution After adding DCP, keep it warm for 5 hours and then stop the reaction. When the temperature drops to room temperature, add ethanol to the system according to the amount of 1L of ethanol per 200g of LDPE, stir for 60 minutes, the product precipitates, then suction filter and wash with acetone 3-5 times, 80 ℃ Dried to constant weight to obtain maleic anhydride grafted polyethylene product;

[0047] S2, the maleic anhydride grafted polyethylene is completely dissolved in butyl acetate, and the butyl acetate of every 100g maleic anhydride grafted polyethylene needs to be 1.5L to obtain the maleic anhyd...

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PUM

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Abstract

The invention discloses a preparation method of a high-energy-storage battery diaphragm material. Polyethylene maleic anhydride is grafted on and coats the surface of magnesium hydroxide, and then resin grafted, coated and modified magnesium hydroxide and matrix resin are subjected to melt blending to prepare the battery diaphragm, so that the mechanical strength, the thermal stability, the wettability, the air permeability and the safety of the diaphragm material can be improved at the same time, and the risk that an inorganic material is disengaged from the diaphragm is completely avoided. The diaphragm material is longitudinally stretched at a relatively low temperature and then longitudinally/transversely stretched synchronously at a relatively high temperature, so that the shape and the pore diameter of micropores in the diaphragm can be effectively ensured, and the micropores are prevented from being seriously deformed. Through a two-stage grafting reaction and microwave heating,grafting and coating of surface resin are carried out on magnesium hydroxide, and grafting and coating of magnesium hydroxide can be uniformly and completely realized.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a method for preparing a diaphragm material for a high energy storage battery. Background technique [0002] The high energy storage secondary battery is mainly composed of positive electrode, negative electrode, electrolyte and battery diaphragm. The battery diaphragm refers to a layer of diaphragm material between the positive electrode and the negative electrode of the battery. When the battery is charging and discharging, ions can freely pass through the battery diaphragm. Electrons cannot pass through, and the battery separator can avoid short circuits caused by direct contact between the positive and negative electrodes of the battery. For high-energy storage secondary batteries, the diaphragm is one of the key battery components. The performance of the diaphragm determines the interface structure and internal resistance of the battery, which directly affects the capacity...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16C08F255/02C08F222/06B29C48/00B29C48/08
CPCB29C48/0018B29C48/08C08F255/02B29K2023/0633B29K2023/00H01M50/403H01M50/446C08F222/06Y02E60/10
Inventor 喻国强刁玉龙
Owner 四川优源新能源有限公司
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