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Positive electrode of solid electrolyte and solid state battery

A solid electrolyte and positive electrode technology, applied in the field of solid-state batteries, can solve the problems of poor mechanical properties, large interface resistance, low electrical conductivity, etc., and achieve the effects of high safety, reduced crystallinity, and simple process

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

Solid electrolytes include polymer electrolytes, inorganic electrolytes and composite electrolytes. Polymer electrolytes have low conductivity at room temperature, and the cost of inorganic solid electrolytes is high. However, the current composite electrolytes have poor mechanical properties and high interface resistance with the positive and negative electrodes.

Method used

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  • Positive electrode of solid electrolyte and solid state battery

Examples

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preparation example Construction

[0041] 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.

[0042] 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.

[0043] 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 O...

Embodiment 1

[0102] Preparation of positive electrode sheet containing lithium iron phosphate

[0103] 1) Mix and stir 50g lithium iron phosphate and 130g N-methylpyrrolidone (NMP) at a temperature of 30°C, a rotation speed of 1500rpm / min, and a time of 3h; then add 20g of styrene-acrylic emulsion with a solid content of 50wt%, 6g of carbon fiber, and keep the temperature After stirring at 30°C and 1000rpm / min for 1.5h, the composite cathode slurry was obtained;

[0104] 2) Coating the above-mentioned composite positive electrode slurry on one or both sides of an aluminum foil with a thickness of 10 μm, and then drying, the single coating thickness is 42 μm, to obtain a positive electrode sheet containing lithium iron phosphate.

[0105] Preparation of polymer graft modified ceramics:

[0106] Under a nitrogen atmosphere, add 1.5g of benzoyl peroxide into 100ml of tetrahydrofuran, stir until completely dissolved, then add 7.5g of methyl methacrylate and 75g of alumina particles (D50=1.0μm...

Embodiment 2

[0115] Preparation of positive electrode sheet containing lithium manganese oxide

[0116] 1) Mix and stir 50g of lithium manganate and 130g of N-methylpyrrolidone (NMP) at a temperature of 30°C and a rotation speed of 1500rpm / min for 3h; then add 20g of styrene-acrylic emulsion with a solid content of 50wt% and 6g of carbon fiber to maintain the temperature After stirring at 30°C and 1000rpm / min for 1.5h, the composite cathode slurry was obtained;

[0117] 2) Coating the above-mentioned composite positive electrode slurry on one or both sides of an aluminum foil with a thickness of 10 μm, and then drying, the single coating thickness is 42 μm, to obtain a positive electrode sheet containing lithium manganate.

[0118] Preparation of polymer graft modified ceramics:

[0119] Under a nitrogen atmosphere, add 1.5g of benzoyl peroxide into 100ml of acetone, stir until completely dissolved, then add 7.5g of methyl methacrylate and ethacrylic acid (ratio 1:1) and 75g of magnesium ...

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Abstract

The invention relates to a positive electrode of a solid electrolyte and a solid state battery. The positive electrode of the solid electrolyte comprises a positive electrode piece and a conductive ceramic composite coating, wherein the positive electrode piece is coated with a positive electrode active material layer, and the outer surface of the positive electrode active material layer is coatedwith the conductive ceramic composite coating. The thickness of the conductive ceramic composite coating is 1-50 [mu]m. The conductive ceramic composite coating comprises organic polymer, lithium salt, nano inorganic solid electrolyte, macromolecule grafted modified ceramic, a binding agent and a wetting agent. Based on the total weight of the conductive ceramic composite coating, the content ofthe organic polymer is 5-80wt%, the content of the lithium salt is 5-50wt%, the content of the nano inorganic solid electrolyte is 10-85wt%, the content of the macromolecule grafted modified ceramic is 1-20wt%, the content of the binding agent is 1-12wt%, and the content of the wetting agent is 0.1-0.5wt%.

Description

technical field [0001] The present disclosure relates to the field of battery positive poles, in particular to a solid electrolyte positive pole and a solid state battery containing the positive pole. 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 polymer electrolytes, inorganic electrolytes, and composite electrolytes. Polymer electrolytes have low conductivity at room temperature, and the cost of inorganic solid electrolytes is high. Howeve...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M4/131H01M4/136H01M10/0525
CPCH01M4/131H01M4/136H01M10/0525H01M10/056H01M2300/0068H01M2300/0082H01M2300/0091Y02E60/10
Inventor 周素霞王晓明徐远新杨浩田
Owner NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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