Shrinkage-resistant graphene oxide-based porous battery diaphragm and preparation method thereof

A technology of battery diaphragm and graphene, which is applied in the direction of lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problems of easy falling of ceramic coatings, loss of heat resistance, safety accidents, etc., and increase thermal stability Performance and safety, enhanced heat shrinkage resistance, and guaranteed dimensional integrity

Inactive Publication Date: 2021-09-17
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the more commonly used battery separator is polyolefin separator, but the melting point of this type of separator is 120~160°C. When the temperature of the separator reaches 120°C, it will shrink, resulting in battery damage or short circuit, causing safety accidents.
However, the high-power partial discharge temperature of power batteries can reach above 100°C, making polyolefin separators unsuitable for power batteries.
Of course, in order to overcome the problem that the polyolefin separator is easy to shrink, it is usually modified by coating inorganic ceramic particles or graphene and other inorganic particles. However, when the battery is injected with electrolyte, the ceramic coating is easy to fall off and loses heat resistance. ; and ceramic coating usually uses polymer materials as binders, which will become weak at high temperatures and reduce the quality of the separator

Method used

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  • Shrinkage-resistant graphene oxide-based porous battery diaphragm and preparation method thereof
  • Shrinkage-resistant graphene oxide-based porous battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: Add 200g of graphene oxide and 1000g of polyether polyol into the reaction kettle in sequence, add 0.5g of p-toluenesulfonic acid, set the reaction temperature to 130°C, and the reaction time to 14 hours, filter and wash to obtain GO-HBPE powder; Ultrasonically disperse 500g of GO-HBPE powder in water for 3.5 hours to form a homogeneous phase, add 0.3g of polystyrene microspheres with a diameter of about 800nm, and stir for 2 hours to obtain an emulsion; vacuum filter the emulsion , set the pressure of the vacuum filtration to be -50kPa to obtain the primary membrane;

[0031] Step 2: Immerse the primary film in toluene for extraction, dissolve the PS pellets, set the temperature at 60°C and heat and dry for 1 hour to obtain a porous battery separator.

Embodiment 2

[0033] Step 1: Add 200g of graphene oxide and 1000g of polyether polyol into the reaction kettle in sequence, add 0.5g of p-toluenesulfonic acid, set the reaction temperature to 130°C, and the reaction time to 14 hours, filter and wash to obtain GO-HBPE powder; Ultrasonically disperse 500g of GO-HBPE powder in water for 3.5 hours to form a homogeneous phase, add 0.4g of polystyrene microspheres with a diameter of about 800nm, and stir for 2 hours to obtain an emulsion; vacuum filter the emulsion , set the pressure of the vacuum filtration to be -50kPa to obtain the primary membrane;

[0034] Step 2: Immerse the primary film in toluene for extraction, dissolve the PS pellets, set the temperature at 60°C and heat and dry for 1 hour to obtain a porous battery separator.

Embodiment 3

[0036] Step 1: Add 200g of graphene oxide and 1000g of polyether polyol into the reaction kettle in sequence, add 0.5g of p-toluenesulfonic acid, set the reaction temperature to 130°C, and the reaction time to 14 hours, filter and wash to obtain GO-HBPE powder; Ultrasonically disperse 500g of GO-HBPE powder in water for 3.5 hours to form a homogeneous phase, add 0.5g of polystyrene microspheres with a diameter of about 800nm, and stir for 2 hours to obtain an emulsion; vacuum filter the emulsion , set the pressure of the vacuum filtration to be -50kPa to obtain the primary membrane;

[0037] Step 2: Immerse the primary film in toluene for extraction, dissolve the PS pellets, set the temperature at 60°C and heat and dry for 1 hour to obtain a porous battery separator.

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Abstract

The invention discloses an anti-shrinkage graphene oxide-based porous battery diaphragm and a preparation method thereof. The porous battery diaphragm is a diaphragm taking graphene oxide as a matrix. The porous battery diaphragm has the beneficial effects that (1) the graphene oxide has good thermal stability, electrochemical inertness and self-film-forming property, and the polyether polyol is grafted, so that the thermal shrinkage resistance of the diaphragm is effectively enhanced, and the size integrity of the diaphragm at 200 DEG C is ensured; (2) the liquid absorption rate of the diaphragm is obviously increased by utilizing the good compatibility between polyether bonds in the polyether polyol and electrolyte; (3) gaps between graphene oxide sheet layers are combined with pores generated between the sheet layers by the PS microspheres, so that the diaphragm generates a rich pore structure, and an adsorption space is provided for liquid absorption of the diaphragm; and (4) the graphene oxide is grafted by using polyether polyol, so that the graphene oxide is inhibited from being reduced into conductive graphene at high temperature, and the thermal stability and safety of the diaphragm are improved.

Description

technical field [0001] The invention relates to the technical field of battery diaphragms, in particular to an anti-shrinkage graphene oxide-based porous battery diaphragm and a preparation method thereof. Background technique [0002] With the continuous development of science and technology, the way of life is gradually becoming intelligent. Smart life is inseparable from electronic products, and batteries are needed everywhere to store electric energy and then supply power. At present, in the energy storage battery industry, lithium batteries have been widely researched and applied, and are developing rapidly. Among them, the battery separator, as one of the key components of lithium batteries, directly affects the capacity, safety, and service life of the battery. [0003] At present, the more commonly used battery separator is polyolefin separator, but the melting point of this type of separator is 120~160°C. When the temperature of the separator reaches 120°C, it wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/446H01M50/489H01M50/403H01M10/052
CPCH01M50/446H01M50/489H01M50/403H01M10/052Y02E60/10
Inventor 刘科尚文滨沈亚定
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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