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Solid electrolyte membrane, preparation method of solid electrolyte membrane, and lithium ion battery

A solid electrolyte membrane and electrolyte technology, applied in the manufacture of solid electrolytes, non-aqueous electrolyte batteries, electrolyte batteries, etc., can solve the problems of brittle and hard mechanical properties, difficult processing, no elasticity, etc., and achieve high ion conductivity, good The effect of processability

Inactive Publication Date: 2017-11-28
上海纳晓能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a solid electrolyte membrane and its preparation method, lithium ion battery, to overcome the existing problems of brittle and hard mechanical properties of the inorganic solid electrolyte membrane, lack of elasticity and difficult to process, etc.

Method used

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  • Solid electrolyte membrane, preparation method of solid electrolyte membrane, and lithium ion battery
  • Solid electrolyte membrane, preparation method of solid electrolyte membrane, and lithium ion battery

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preparation example Construction

[0029] The embodiment of the present application also discloses a method for preparing a solid electrolyte membrane, including steps:

[0030] (1), the phase separation method prepares the polymer matrix of three-dimensional network structure;

[0031] (2), the lithium inorganic solid electrolyte powder is mixed with a binder, and ball milled to form a uniformly dispersed mixed slurry;

[0032] (3) Soak the porous polymer matrix in the mixed slurry, pull it out, and dry it to obtain a solid electrolyte membrane.

[0033] Preferably, the step (1) includes: blending the polymer resin with a diluent, melting at high temperature to form a homogeneous solution → extrusion, casting into a film → cooling in a cooling bath, phase separation occurs → high temperature evaporation of solvent → high temperature two-way Stretch into a film → Provide a certain tension to ensure that the film will not shrink and extract and remove the diluent → Stretch the extracted film to further stretch ...

Embodiment 1

[0047] 5wt% (accounting for the percentage of total feeding mass) of ultra-high molecular weight polyethylene (UHMWPE, 1x10 6 , the melting point is 128°C, the glass transition temperature is -78°C) into the twin-screw extruder, and 95% (accounting for the percentage of the total feeding mass) of solid paraffin is added through the side feed port, and the mixture is heated at 150°C, Under the condition of 160 rev / min, melt and mix the resin. The mixed polyolefin melt was extruded through a die to form a polyolefin film with a thickness of 0.2mm, and the polyolefin film was directly cooled in a water bath at 20°C to obtain a porous polyolefin gel film. Fix the porous polyolefin gel film bidirectionally, place it in an oven at 120°C for 12 hours, and after the solvent is completely volatilized, stretch it longitudinally and transversely at 130°C in sequence, the stretching ratio = vertical × horizontal = 10 × 8, and the The thickness is 1 μm, the wire diameter is 0.002-0.5 μm, ...

Embodiment 2

[0051] 5wt% (accounting for the percentage of total feeding mass) of ultra-high molecular weight polyethylene (UHMWPE, 1 × 10 6 , the melting point is 128°C, the glass transition temperature is -78°C) into the twin-screw extruder, and 95% (accounting for the percentage of the total feeding mass) of solid paraffin is added through the side feed port, and the mixture is heated at 150°C, Under the condition of 160 rev / min, melt and mix the resin. The mixed polyolefin melt was extruded through a die to form a polyolefin film with a thickness of 0.2mm, and the polyolefin film was directly cooled in a water bath at 20°C to obtain a porous polyolefin gel film. Fix the porous polyolefin gel film bidirectionally, place it in an oven at 120°C for 12 hours, and after the solvent is completely volatilized, stretch it longitudinally and transversely at 130°C in sequence, and the stretching ratio = vertical × horizontal = 5 × 2, to obtain A three-dimensional sponge-like polyolefin porous m...

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Abstract

The invention discloses a solid electrolyte membrane, a preparation method of the solid electrolyte membrane, and a lithium ion battery. The solid electrolyte membrane is a material of a composite structure, wherein the material is formed by compounding lithium inorganic solid electrolyte and a polymer; a polymer with a continuous three-dimensional sponge network structure is filled with the lithium inorganic solid electrolyte; the primary particle size of the lithium inorganic solid electrolyte is 0.01-3 microns; the polymer has the continuous three-dimensional sponge network structure; the diameter of the polymer in the network structure is 0.002-0.5 micron; a weight ratio of the lithium inorganic solid electrolyte to the polymer is 70:30 to 95:5; the composite structure has pores; the size of each pore is 0.01-3 microns; a ratio of the pore volume to the volume of the whole composite material is 1-15%; the overall thickness of the composite material is 1-50 microns; and the tensile strength is higher than 10MPa. According to the solid electrolyte membrane disclosed by the invention, high ionic conductivity of the lithium inorganic solid electrolyte can be maintained, and excellent processability, mechanical property, corrosion resistance and oxidation resistance can be provided.

Description

technical field [0001] The application belongs to the field of lithium-ion batteries, and in particular relates to a solid electrolyte membrane, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Due to the advantages of large specific capacity, long charge and discharge life, no memory effect, and low environmental pollution, lithium-ion batteries have been widely used in various fields since their commercialization in the early 1990s, ranging from portable electronic products, electric vehicles, etc. to grid energy storage. [0003] Lithium-ion batteries currently in use contain flammable liquid organic electrolytes, which are prone to safety accidents such as leakage, electrode corrosion, and even fire and combustion. In the high-capacity lithium-sulfur battery system, the shuttle effect of polysulfide ions in the liquid electrolyte and the dendritic growth of negative metal lithium seriously restrict the practical application and furt...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565H01M10/058H01M2300/0068H01M2300/0082Y02E60/10Y02P70/50
Inventor 吴晓东
Owner 上海纳晓能源科技有限公司
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