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A kind of thermally conductive composite diaphragm for battery and its application

A thermally conductive composite and separator technology, applied in the field of composite materials, can solve the problem of poor thermal conductivity of battery composite separators, and achieve the effect of achieving barrier effect, improving battery performance, and improving thermal conductivity.

Active Publication Date: 2021-03-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a thermally conductive composite separator for batteries and its application, which arranges the alumina / carbon hybrid fiber layer on one or both sides of the polyolefin porous separator to obtain Thermally conductive composite diaphragm for batteries, thereby solving the technical problem of poor thermal conductivity of battery composite diaphragms in the prior art

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  • A kind of thermally conductive composite diaphragm for battery and its application
  • A kind of thermally conductive composite diaphragm for battery and its application
  • A kind of thermally conductive composite diaphragm for battery and its application

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Embodiment 1

[0060] The invention discloses a heat-conducting composite diaphragm for a battery. This thermally conductive composite separator for batteries includes a polyolefin porous separator and an alumina / carbon hybrid fiber layer. The aluminum salt-polymer mixture is spun into fibers by electrospinning, and carbonized at high temperature under a protective atmosphere to form an alumina / carbon hybrid fiber layer, which is attached to the pole piece side of the polyolefin porous diaphragm . The polyolefin porous membrane is a polyethylene microporous membrane; the aluminum salt is aluminum nitrate; the polymer is polyacrylonitrile; the solution is N,N-dimethylformamide; The total mass fraction of the aluminum salt and the polymer in the aluminum salt-polymer mixed solution is 10%, wherein the mass ratio of the aluminum salt to the polymer is 1:1; the thickness of the prepared aluminum salt-polymer fiber film is 10 μm.

[0061] The preparation method of the thermally conductive compo...

Embodiment 2

[0069] The invention discloses a heat-conducting composite diaphragm for a battery. This thermally conductive composite separator for batteries includes a polyolefin porous separator and an alumina / carbon hybrid fiber layer. The aluminum salt-polymer mixture is spun into fibers by electrospinning, and carbonized at high temperature under a protective atmosphere to form an alumina / carbon hybrid fiber layer, which is attached to the pole piece side of the polyolefin porous diaphragm . The polyolefin porous membrane is a polyethylene microporous membrane; the aluminum salt is aluminum tert-butoxide; the polymer is polyvinylpyrrolidone; the solution is water; the aluminum salt-polymer The total mass fraction of aluminum salt and polymer in the mixed solution is 25%, wherein the mass ratio of aluminum salt to polymer is 1:4, and the thickness of the prepared aluminum salt-polymer fiber film is 20 μm.

[0070] The preparation method of the thermally conductive composite separator ...

Embodiment 3

[0078] The invention discloses a heat-conducting composite diaphragm for a battery. This thermally conductive composite separator for batteries includes a polyolefin porous separator and an alumina / carbon hybrid fiber layer. The aluminum salt-polymer mixture is spun into fibers by electrospinning, and carbonized at high temperature under a protective atmosphere to form an alumina / carbon hybrid fiber layer, which is attached to both sides of the polyolefin porous membrane. The polyolefin porous diaphragm is polypropylene / polyethylene / polypropylene composite film; the aluminum salt is aluminum hydroxide; the polymer is polyvinyl butyral; the solution is ethanol; The total mass fraction of the aluminum salt and the polymer in the aluminum salt-polymer mixed solution is 50%, wherein the mass ratio of the aluminum salt to the polymer is 1:10, and the thickness of the aluminum salt-polymer fiber film obtained is 30 μm .

[0079] The preparation method of the thermally conductive c...

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Abstract

The invention belongs to the technical field of composite materials, and particularly relates to a heat-conducting composite diaphragm for a battery and application of the heat-conducting composite diaphragm. The heat conduction composite diaphragm for the battery comprises a polyolefin porous diaphragm and aluminum oxide / carbon hybrid fiber layers attached to the two sides or one side of the polyolefin porous diaphragm. The invention provides a polyolefin porous diaphragm / aluminum oxide / carbon hybrid fiber layer composite material. Due to the fact that high-thermal-conductivity aluminum oxidein the aluminum oxide / carbon hybrid fiber layer exists in the form of continuous fibers, Meanwhile, the fibers are fused and connected in the high-temperature carbonization process, the contact interface is reduced, the interface thermal resistance is reduced, the construction of a thermal conduction path is realized, the thermal conductivity of the composite material is improved, and the diffusion of internal heat of the battery is realized. When the heat-conducting composite diaphragm for the battery is applied to a lithium-sulfur battery, the purpose of improving the performance of the battery can be achieved. Compared with the prior art, the battery performance can be effectively improved, and the problem of poor heat-conducting property of the polyolefin porous diaphragm is solved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and more specifically relates to a thermally conductive composite diaphragm for batteries and an application thereof. Background technique [0002] With population growth and economic development, people's demand for energy continues to increase. However, the existing fossil energy is increasingly depleted and polluted seriously, and a green, environmentally friendly and renewable new energy is urgently needed to solve the current energy crisis. As an environmentally friendly and renewable new energy source, secondary batteries are expected to become a breakthrough in future energy development. Among them, the theoretical specific capacity of lithium-sulfur battery is as high as 1675mAh g -1 , the theoretical energy density is 2600Wh kg -1 , the positive electrode material sulfur is environmentally friendly, inexpensive, and abundant in reserves, so it has many advantages. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/454H01M50/451H01M50/431H01M50/44H01M10/653H01M10/654H01M10/052
CPCH01M10/052H01M10/653H01M10/654H01M50/431H01M50/44H01M50/449Y02E60/10
Inventor 解孝林常晨叶昀昇周兴平石清璇裴会杰
Owner HUAZHONG UNIV OF SCI & TECH
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