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Lithium ion battery separating membrane, preparing method thereof and applications of the separating membrane

A technology of lithium-ion battery and diaphragm, which is applied in the field of lithium-ion battery diaphragm and its preparation and application, and can solve the problems of impact, poor discharge characteristics of battery rate, low electronic and ion conductivity, etc.

Inactive Publication Date: 2014-10-22
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, since the metal oxides used are basically inorganic materials with stable chemical properties, good heat resistance, and high mechanical strength, these substances have very good electrical insulation materials, so they all have very low electron and ion density. conductivity
Such substances inevitably increase the internal resistance of the battery and have a negative impact on the rate discharge characteristics of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The lithium ion battery separator includes a separator substrate and an inorganic electrolyte coating covering both sides of the separator substrate. The separator substrate is a polypropylene porous separator. The inorganic electrolyte coating includes the following components according to weight percentage: LiPON solid particles 2% (particles) The diameter is about 0.5-5μm), PVDF adhesive 1%, γ-(methacryloxy)propyltrimethoxysilane 0.5%, and acetone 96.5%.

[0024] The preparation method includes:

[0025] 1) Weigh the following components by weight: LiPON solid particles 2% (particle size is about 0.5-5μm), PVDF adhesive 1%, γ-(methacryloxy)propyltrimethoxysilane 0.5% , Acetone 96.5%; firstly mix LiPON solid particles with PVDF adhesive, then add γ-(methacryloxy)propyltrimethoxysilane and acetone, and perform high-speed shearing and stirring for 1h to obtain a uniformly mixed Inorganic electrolyte slurry;

[0026] 2) This inorganic electrolyte slurry is evenly coated on bo...

Embodiment 2

[0029] The lithium ion battery separator includes a separator substrate and an inorganic electrolyte coating covering both sides of the separator substrate. The separator substrate is a polypropylene porous separator. The inorganic electrolyte coating includes the following components according to weight percentage: LiPON solid particles 10% (particles) The diameter is about 0.5-5μm), PVDF adhesive 2%, γ-(methacryloxy)propyltrimethoxysilane 0.5%, acetone 87.5%.

[0030] Its preparation includes the following methods:

[0031] 1) Weigh the following components by weight: LiPON solid particles 10% (particle size is about 0.5-5μm), PVDF adhesive 2%, γ-(methacryloxy)propyltrimethoxysilane 0.5% , Acetone 87.5%; first, the LiPON solid particles and PVDF adhesive are coarsely mixed, then γ-(methacryloxy)propyltrimethoxysilane and acetone are added, and the mixture is uniformly mixed after high-speed shearing and stirring for 1 hour Inorganic electrolyte slurry;

[0032] 2) This inorganic ...

Embodiment 3

[0036] The lithium ion battery separator includes a separator substrate and an inorganic electrolyte coating covering both sides of the separator substrate. The separator substrate is a polypropylene porous separator. The inorganic electrolyte coating includes the following components according to weight percentage: LiPON solid particles 20% (particles) The diameter is about 0.5-5μm), polymethyl methacrylate (PMMA) binder 4%, γ-(methacryloxy)propyltrimethoxysilane 0.5%, solvent 75.5%, solvent consists of methanol and acetone Mix by volume ratio 1:1.

[0037] Its preparation includes the following methods:

[0038] 1) Weigh the following components by weight: LiPON solid particles 20% (particle size is about 0.5-5μm), polymethyl methacrylate (PMMA) adhesive 4%, γ-(methacryloyloxy) 0.5% of propyltrimethoxysilane, 75.5% of the solvent, the solvent is composed of methanol and acetone mixed in a volume ratio of 1:1; first, the LiPON solid particles and the polymethyl methacrylate (PMMA...

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PUM

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Abstract

The invention relates to a lithium ion battery separating membrane, a preparing method thereof and applications of the separating membrane. The separating membrane comprises a separating membrane substrate and an inorganic electrolyte coating covering one side or two sides of the separating membrane substrate. The inorganic electrolyte coating comprises 1-20% by weight of an inorganic component, 0.2-4% by weight of an adhesive, 0.1-1% by weight of an additive, and 75-98% by weight of a solvent. The inorganic component comprises at least one selected from LiPON, L2S-P2S5, Li10GeP2S12, Li2S-SiS2-Li3PO4, and La<0.5>Li<0.5>TaO3 solid particles. The particle size of the solid particles is 0.05-20 [mu]m. The adhesive comprises at least one of polyvinylidene fluoride, polymethyl methacrylate and polyacrylic acid (PAA). The additive comprises at least one of gamma-methacryloxypropyltrimethoxysilane, N-methylformamide, dimethylformamide, butyl butyrate and tributylamine. The solvent comprises at least one of N-methyl-2-pyrrolidone, acetone, methanol, n-heptane, isopropanol and dimethylacetamide. The lithium ion battery separating membrane has high electrical conductivity.

Description

【Technical Field】 [0001] The invention relates to a lithium ion battery diaphragm and a preparation method and application thereof. 【Background technique】 [0002] The development trend of lithium-ion batteries is to further reduce manufacturing costs, improve safety and cycle life, and develop renewable energy storage batteries and batteries for electric vehicles. High-performance lithium-ion batteries have increasingly higher requirements for separators. With the development of demand for automotive power batteries, a rapid industrial growth will be formed, and the demand for diaphragms will also increase substantially. [0003] In the structure of lithium-ion batteries, the diaphragm is one of the key components and an important determinant of battery capacity, cycle capacity and safety performance. [0004] The diaphragm in the battery mainly plays an important role in separating the positive electrode and the negative electrode material, blocking the electronic conductance of ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/449
CPCH01M10/0525H01M50/403H01M50/446Y02E60/10
Inventor 高云智彭冲左朋建徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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