Conductive ceramic composite diaphragm and solid-state battery

A technology of conductive ceramics and composite diaphragms, applied in the field of conductive ceramic composite diaphragms and solid-state batteries, can solve the problems of poor mechanical properties of composite electrolytes, high cost of inorganic solid electrolytes, and large interface resistance, so as to facilitate the diffusion of lithium ions and improve interface stability Sex and electrochemical working window, increasing the effect of thermal stability

Active Publication Date: 2018-11-23
NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conductivity of polymer electrolytes is low at room temperature, the cost of inorganic solid electrolytes is high, and the mechanical properties of composite electrolytes are poor, and the interface resistance between positive and negative electrodes is large

Method used

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  • Conductive ceramic composite diaphragm and solid-state battery
  • Conductive ceramic composite diaphragm and solid-state battery
  • Conductive ceramic composite diaphragm and solid-state battery

Examples

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preparation example Construction

[0034]There is no special limitation on the preparation method of the nano inorganic solid electrolyte, as long as it can have the above particle size. For example, the submicron-sized inorganic electrolyte can be pulverized by planetary ball milling and / or high-energy ball milling to obtain a nano-sized inorganic solid-state electrolyte that meets the particle size requirements.

[0035] The polymer graft-modified ceramics may be ceramic particles graft-modified with acrylic acid polymers. Here, the acrylic polymer refers to a homopolymer or a copolymer formed by homopolymerization or copolymerization of acrylic monomers.

[0036] The glass transition temperature (Tg) of the acrylic polymer may range from 50°C to 200°C, preferably from 80°C to 180°C. For example, the acrylic polymer may be polymethyl methacrylate, or methyl methacrylate and methyl methacrylate selected from methacrylic acid, ethacrylic acid, ethyl acrylate, ethyl methacrylate, propyl methacrylate, methyl On...

Embodiment 1

[0087] Preparation of polymer graft modified ceramics:

[0088] Under a nitrogen atmosphere, add 6g of benzoyl peroxide into 400ml of tetrahydrofuran, stir until completely dissolved, then add 30g of methyl methacrylate and 300g of alumina particles (D50=1.0μm), reflux at 80°C for 5h, cool, After suction filtration and vacuum drying for 10 h, modified ceramic particles (D50=1.5 μm) were obtained.

[0089] Preparation of nano inorganic solid electrolyte:

[0090] Submicron LLZO was pulverized by planetary ball milling and high energy ball milling to obtain nano LLZO with a particle size D50 of 210nm.

[0091] Preparation of conductive ceramic composite separator:

[0092] The modified ceramics (150g) and nanometer LLZO (800g) prepared above are dispersed into the deionized water of 2Kg, then add 600g polyoxyethylene as organic polymer, 240g as the solid content of binding agent is 50wt% styrene-butadiene latex and 3 g of polyoxyethylene alkylamine as a wetting agent were mix...

Embodiment 2

[0097] Preparation of polymer graft modified ceramics:

[0098] Under nitrogen atmosphere, add 6g benzoyl peroxide in 400ml acetone, stir until fully dissolved, then add the mixture of 30g methyl methacrylate and ethacrylic acid (molar ratio 1:1) and 300g magnesium oxide particles ( D50=0.9 μm), reflux reaction at 80° C. for 6 hours, cooling, suction filtration, and vacuum drying for 8 hours to obtain modified ceramic particles (D50=1.3 μm).

[0099] Preparation of nano inorganic solid electrolyte:

[0100] Submicron LLZO is pulverized by planetary ball milling and high energy ball milling to obtain nano LLZO with a particle size D50 of 240nm.

[0101] Preparation of conductive ceramic composite separator:

[0102] The modified ceramics (150g) and nano LLZO (800g) prepared above were dispersed into 2Kg of deionized water, and then 600g of polyvinylidene fluoride as an organic polymer, 120g of polyvinyl alcohol as a binder, and 3g of polyvinyl alcohol as a binder were added. ...

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Abstract

The invention relates to a conductive ceramic composite diaphragm and a solid-state battery. The conductive ceramic composite diaphragm comprises a porous base membrane and a conductive ceramic composite coating layer which is coated on one side or two sides of the porous base membrane, wherein the conductive ceramic composite coating layer comprises the following components based on the total weight thereof: 5-80wt% of an organic polymer, 10-85wt% of a nano inorganic solid electrolyte, 1-20wt% of high-molecular grafted modified ceramic, 1-12wt% of a binder and 0.1-0.5wt% of a wetting agent.

Description

technical field [0001] The disclosure relates to the field of battery diaphragms, in particular to a conductive ceramic composite diaphragm and a solid-state battery comprising the diaphragm. Background technique [0002] In recent years, in the field of new energy vehicles, the demand for lithium-ion batteries has increased year by year. At present, lithium-ion batteries generally use liquid organic electrolytes for ion conduction, but organic electrolytes are prone to accidents such as leakage, electrode corrosion, combustion and explosion, and there are major safety hazards. [0003] Solid-state electrolyte batteries have gradually entered the public's field of vision due to their characteristics of organic liquid batteries and high safety. Solid electrolytes include organic polymer electrolytes, inorganic electrolytes and composite electrolytes. Polymer electrolytes have low conductivity at room temperature, and the cost of inorganic solid electrolytes is high, while c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/052H01M10/0525H01M10/056
CPCH01M10/052H01M10/0525H01M10/056H01M50/446H01M50/449Y02E60/10
Inventor 杨浩田王晓明刘勇标黄云
Owner NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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