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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  • Abstract
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  • Claims
  • Application Information

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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 e

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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

Examples

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Example Embodiment

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

[0030] (1) The polymer matrix of the three-dimensional network structure is prepared by the phase separation method;

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

[0032] (3), soaking the porous polymer matrix into the mixed slurry, pulling out and drying to obtain a solid electrolyte membrane.

[0033] Preferably, the step (1) includes: blending the polymer resin with a diluent, melting at high temperature into a homogeneous solution → extrusion, casting film → cooling in a cooling bath, phase separation occurs → high temperature evaporation of solvent → high temperature bidirectional Stretch into a film → extract and remove the diluent under the condition that a certain tension is provided to ensure that the film will not shrink → th...

Example Embodiment

[0046] Example 1

[0047] The ultra-high molecular weight polyethylene (UHMWPE, 1×10 6 , the melting point is 128 °C, and the glass transition temperature is -78 °C) into the twin-screw extruder, and 95% (accounting for the percentage of the total feed mass) solid paraffin is added through the side feeding port. Under the condition of 160 rpm, the resin is melted and mixed. The mixed polyolefin melt was extruded through a die into a polyolefin film with a thickness of 0.2 mm, and the polyolefin film was directly cooled in a 20° C. water bath to obtain a porous polyolefin gel film. The porous polyolefin gel film was fixed in two directions, placed in an oven at 120 °C for 12 hours, and after the solvent was completely volatilized, longitudinally stretched and transversely stretched at 130 °C in turn, stretching ratio = vertical × horizontal = 10 × 8, to obtain The thickness is 1 μm, the wire diameter is 0.002-0.5 μm, the pore size is 0.01-3 μm, the porosity is 90%,

[0048] ...

Example Embodiment

[0050] Example 2

[0051] The ultra-high molecular weight polyethylene (UHMWPE, 1×10 6 , the melting point is 128 °C, and the glass transition temperature is -78 °C) into the twin-screw extruder, and 95% (accounting for the percentage of the total feed mass) solid paraffin is added through the side feeding port. Under the condition of 160 rpm, the resin is melted and mixed. The mixed polyolefin melt was extruded through a die into a polyolefin film with a thickness of 0.2 mm, and the polyolefin film was directly cooled in a 20° C. water bath to obtain a porous polyolefin gel film. The porous polyolefin gel film was fixed in two directions, placed in an oven at 120 °C for 12 hours, and after the solvent was completely volatilized, longitudinal stretching and transverse stretching were carried out at 130 °C in turn, stretching ratio = vertical × horizontal = 5 × 2, to obtain A polyolefin porous membrane with a three-dimensional sponge-like structure with a thickness of 10 μm, ...

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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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