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Ionic-electronic conductor composite film and preparation method thereof and lithium battery

A technology of electronic conductor and ion conductor, which is applied in the field of ion-electronic conductor composite film and its preparation method and lithium battery, can solve the problems of reducing the energy density of the battery, increasing the transmission distance of lithium ions, increasing the internal resistance of the battery, etc. Crystal, the preparation method is environmentally friendly, and the effect of uniform thickness

Inactive Publication Date: 2019-04-16
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existence of the ceramic layer reduces the energy density of the battery, coating on the surface of the membrane increases the transmission distance of lithium ions and increases the internal resistance of the battery

Method used

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  • Ionic-electronic conductor composite film and preparation method thereof and lithium battery
  • Ionic-electronic conductor composite film and preparation method thereof and lithium battery
  • Ionic-electronic conductor composite film and preparation method thereof and lithium battery

Examples

Experimental program
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preparation example Construction

[0048] The preparation method of the ion-electron conductor composite membrane provided in this embodiment, its steps are as follows figure 2 shown, including the following steps:

[0049] Step 210, adding the dispersant, binder, conductive additive, auxiliary agent and solvent into the pre-mixing tank according to the required ratio, and completely dissolving to obtain the first mixture;

[0050] Wherein, the solvent is a polar solvent, including deionized water, N-methylpyrrolidone (NMP), alcohol or dimethylformamide (DMF);

[0051] Binders include polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene, polytetrafluoroethylene, polymethylmethacrylate, polyacrylonitrile, styrene-butadiene latex, styrene-acrylic latex, polyvinyl alcohol, ethylene-vinyl acetate , sodium alginate, polyacrylamide, polymethyl methacrylate-butyl acrylate, ethylene-vinyl acetate copolymer, polyvinyl acetate, polyurethane, hydroxyethyl cellulose, methyl hydroxyethyl cellulose, carboxy...

Embodiment 1

[0062] This embodiment provides an ion-electronic conductor composite membrane, including a base membrane and a coating material coated on the base membrane and penetrating into the base membrane. Wherein the base film is a polypropylene porous film with a thickness of 10um, adopts a single-sided coating method, the coating thickness is 4um, and the mass ratio of the coating slurry is: 20% composition and 80% deionized water; wherein, the combination The preparation of the product is according to the mass ratio: 88% ionic conductor material lithium titanium aluminum phosphate Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 Powder, 3% electronic conductor material carbon black SUPER-P, 5% coating material nano-alumina, 0.5% binder sodium carboxymethyl cellulose, 1% styrene-butadiene latex, 1% dispersant Sodium dodecylbenzene sulfonate, 0.5% octylphenol polyoxyethylene, 1% auxiliary polyvinyl alcohol.

[0063] The ion-electronic conductor composite membrane in this embodiment is prepared by...

Embodiment 2

[0070] This embodiment provides an ion-electronic conductor composite membrane, including a base membrane and a coating material coated on the base membrane and penetrating into the base membrane. Wherein the base film is a polypropylene porous film with a thickness of 10um, adopts a single-sided coating method, the coating thickness is 4um, and the mass ratio of the coating slurry is: 30% composition and 70% deionized water; wherein, the composition The preparation is according to the mass ratio: 5% ionic conductor material lithium titanium aluminum phosphate Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3Powder, 5% electronic conductor material carbon black SUPER-P, 86% coating material nano-alumina, 1% binder sodium carboxymethyl cellulose, 1% styrene-butadiene latex, 1% dispersant Sodium polyacrylate and 1% polyethylene glycol 1%.

[0071] The method for preparing the ion-electron conductor composite membrane is the same as that in Example 1.

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Abstract

The invention discloses an ionic-electronic conductor composite film and a preparation method thereof and a lithium battery. The ionic-electronic conductor composite film comprises a base film rangingfrom 1 micron to 50 microns and a coating material ranging from 0.5 micron to 10 microns, wherein the coating material is spread on the base film or is spread on the base film and permeates into thebase film; the coating material comprises, by mass, ionic conductor materials [1wt%-99.98wt%], electronic conductor materials [0.01wt%-10wt%], coat materials [0wt%-98.98wt%], adhesives [0.01wt%-10wt%], dispersing agents [0wt%-2wt%] and auxiliaries [0wt%-2wt%]; the ionic conductor materials specifically include one or multiple mixtures of an LISCION solid electrolyte material, an NASCION solid electrolyte material, a perovskite solid electrolyte material or a garnet solid electrolyte material and a derivative material; and the electronic conductor materials include one or more of carbon black,conductive graphite, carbon fibers, carbon nano tubes, acetylene black, Ketjenblack, graphene, metallic silver, metallic gold, vapor phase growth carbon fibers VGCF, conductive graphite KS-6 and carbon black SUPER-P.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to an ion-electronic conductor composite membrane, a preparation method thereof, and a lithium battery. Background technique [0002] The main components of a traditional liquid lithium-ion battery are positive electrode, negative electrode, electrolyte and separator. With the demand of the market, the requirements for the performance of the lithium battery separator are getting higher and higher. Under the premise of ensuring safety, the separator needs to have high mechanical strength and high ionic conductivity, but it is quite difficult to achieve the coexistence of the two. In the prior art, coating a ceramic layer on the surface of the diaphragm can effectively improve the heat resistance, safety, thermal stability and mechanical strength of the membrane, thereby prolonging the service life of the membrane. [0003] However, the presence of the ceramic layer...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M10/42H01M50/403H01M50/431H01M50/449H01M50/489H01M50/497
CPCH01M10/052H01M10/4235H01M50/403H01M50/409Y02E60/10
Inventor 闫昭罗飞陶凌李泓
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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