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Organic-inorganic composite membrane as well as preparation and application thereof

An inorganic composite and organic technology, applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problems of increasing the cost of the battery diaphragm, reducing the porosity of the diaphragm, and the twists and turns of the lithium ion channel, achieving high safety performance and reliability. The effect of reducing volatility and avoiding heat shrinkage

Active Publication Date: 2013-09-18
王海斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after coating and modifying the separator with inorganic nanoparticles, the porosity of the separator is greatly reduced, and the passage of lithium ions is also more tortuous, which increases the internal resistance of the battery and further increases the cost of the battery separator.

Method used

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  • Organic-inorganic composite membrane as well as preparation and application thereof
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  • Organic-inorganic composite membrane as well as preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] For the preparation of the diaphragm, the inorganic particles used are hectorite (lithium magnesium silicate) with a particle size of 10-15nm, the polymer is PVDF (polyvinylidene fluoride) with a molecular weight of 640,000, and the solvent is NMP (N-methylpyrrolidone ) and methanol in a mass ratio of 5:1. According to hectorite:PVDF:solvent=9:1:20 (mass ratio), mix hectorite, PVDF, and solvent at room temperature to form a slurry, pour it on a stainless steel plate, heat and dry it at 150°C for 5 hours, and prepare Composite film with a thickness of 30 μm.

[0053] Configure the electrolyte, using LiPF 6 It is a lithium salt, DMC and EC are solvents, and the configuration composition is DMC·1MLiPF 6 / EC (1:1, w / w) electrolyte. Add this electrolyte dropwise on the surface of the composite membrane, it can be quickly absorbed by the composite and evenly dispersed.

[0054] The liquid absorption rate of this composite membrane can reach 200%. As the liquid absorption ...

Embodiment 2

[0057] For the preparation of the diaphragm, the inorganic particles used are porous silica with a particle size of 40-45nm, the polymer is PVDF with a molecular weight of 3,200,000, and the solvent is NMP. According to porous silica:PVDF:NMP=5:1:10 (mass ratio), porous silica, PVDF, and NMP were mixed into a slurry at room temperature, poured on an aluminum plate, heated and dried at 70°C for 8 hours, and prepared A composite film with a thickness of 30 μm was formed.

[0058] Configure the electrolyte, using LiBOB and LiPF 6 It is lithium salt, DMC, EC and PC are solvents, and the configuration composition is 1MLiBOB / EC·DEC·1MLiPF 6 / PC (1:1:1, w / w / w) electrolyte.

[0059] The highest liquid absorption rate of this composite membrane is 160%, and the conductivity of the electrolyte membrane at 25°C is 1.65×10 when the liquid absorption rate is 100%. -3 S / cm.

Embodiment 3

[0061] For the preparation of the diaphragm, the inorganic particles used are porous aluminum oxide with a particle size of 70-75nm, the polymer is PE (polyethylene) with a molecular weight of 32000, and the solvent is toluene. According to porous aluminum oxide:PE:toluene=20:1:15 (mass ratio), mix porous aluminum oxide, PE, and toluene at 101°C to form a slurry, pour it on a glass plate, and heat it at 100°C Dry for 6 hours to prepare a composite film with a thickness of 30 μm.

[0062] Configure the electrolyte, using LiPF 6 It is a lithium salt, DMC, DEC and PC are solvents, and the configuration composition is DMC·DEC·2MLiPF 6 / PC (1:1:2, w / w / w) electrolyte.

[0063] The highest liquid absorption rate of this composite membrane is 170%, and the conductivity of the electrolyte membrane at 25°C is 1.58×10 when the liquid absorption rate is 100%. -3 S / cm.

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Abstract

The invention discloses an organic-inorganic composite membrane as well as preparation and application thereof, and belongs to the technical field of preparation of a lithium ion battery material. The organic-inorganic composite membrane is prepared from inorganic particles and a high-molecular polymer, wherein the inorganic particles are evenly embedded and distributed inside the high-molecular polymer, and are selected from layered inorganic materials and / or porous inorganic materials; the mass ratio of the inorganic particles to the high-molecular polymer is (5-20):1; the particle sizes of the inorganic particles are 2-100nm. The organic-inorganic composite membrane disclosed by the invention has good mechanical property and lithium ionic conduction ability after absorbing electrolyte; the composite membrane has excellent safety performance after being prepared into an electric element, and is suitable for being applied to the field of a large battery, especially a large fixation energy storage battery. The organic-inorganic composite membrane is simple and feasible in preparation technology, and conveniently achieves industrial production.

Description

technical field [0001] The invention relates to an organic-inorganic composite diaphragm and its preparation and application, and belongs to the technical field of lithium ion battery material preparation. Background technique [0002] Improving the safety performance of batteries is a key issue that needs to be solved in the development of lithium-ion batteries to the field of large-scale battery applications. [0003] The safety problem of lithium-ion batteries is mainly caused by the flammable electrolyte in it. When the battery is overcharged, overdischarged or the temperature is too high, the battery is easy to thermal runaway and cause combustion and explosion. However, large-scale and high-capacity lithium-ion batteries carry a large current, the battery pack system and battery control module are more complicated, and safety issues are more prominent. Modifying or redesigning the electrolyte and diaphragm is a major technical route to improve the safety performance o...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/411H01M50/431H01M50/489
CPCY02E60/10
Inventor 刘晋李劼徐俊毅赖延清朱凯张锦
Owner 王海斌
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