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Solid-state electrolyte positive pole and solid-state battery containing same

A solid electrolyte, solid electrolyte technology, applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, solid electrolyte, etc., can solve the problems of poor mechanical properties, large interface resistance, low conductivity, etc., to achieve high safety and high mechanical properties , The effect of simple process

Active Publication Date: 2018-12-14
JIANGSU ADVANCED 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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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] There is no special restriction on the preparation method of the nano inorganic solid electrolyte, as long as it can have the above-mentioned particle size. For example, the submicron inorganic electrolyte can be pulverized by planetary ball milling and / or high-energy ball milling to obtain a nanometer inorganic solid electrolyte meeting the particle size requirements.

[0042] In this disclosure, D50 refers to the particle size corresponding to the cumulative distribution of 50% in the particle size distribution curve, which can be measured by a laser particle size tester, such as BetterSize2000 from Dandong Better Instruments Co., Ltd.

[0043] In the composite solid electrolyte layer, the wetting agent is used to reduce the surface energy of the slurry, improve its wettability with the porous membrane, and avoid undesirable phenomena such as leakage. There is no particular limitation on the wetting agent, and the wetting agent suitable for preparing the positive electrode...

Embodiment

[0077] The technical solutions of the present disclosure will be further illustrated by the following examples. It should be understood by those skilled in the art that the described embodiments are merely to help understand the present disclosure and should not be regarded as specific limitations to the present disclosure.

[0078] Reagents and instruments

[0079] Unless otherwise specified, all reagents used are commercially available reagents suitable for lithium batteries. Unless otherwise stated, the same terms refer to the same materials. Polyvinylidene fluoride was purchased from Dongguan Liheng Plastic Materials Co., Ltd. Lithium iron phosphate and lithium manganate were purchased from Guizhou Anda Technology Energy Co., Ltd. Ternary cathode materials were purchased from Hunan Shanshan New Material Co., Ltd. The particle size D50 was detected with a laser particle size analyzer (Dandong Bettersize Instrument Co., Ltd., BetterSize2000).

preparation Embodiment 1

[0081] Preparation of negative electrode

[0082] 1) Mix 32g of natural graphite, 6g of polyvinylidene fluoride, and 60g of deionized water with planetary stirring at a temperature of 35°C, a rotation speed of 1500rpm / min, and a time of 2h; then add 2g of acetylene black and keep the temperature at 35°C, 1000rpm / min After stirring for 1 hour, an aqueous graphite slurry is obtained;

[0083] 2) After passing the above-mentioned aqueous graphite slurry through a 300-mesh screen, it is coated on one or both sides of the copper foil to form a graphite coating, and dried to a thickness of 20 μm. Then roll pressing, slitting and sheeting are performed to obtain the negative electrode.

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Abstract

The present invention relates to a composite positive pole for a lithium ion battery and a solid-state battery including the positive pole. The solid-state electrolyte positive pole comprises a positive plate on which a positive pole active material layer is formed and a composite solid-state electrolyte layer formed on an outer surface of the positive pole active material layer, wherein the thickness of the composite solid-state electrolyte layer is 1 to 50 [mu]m; the composite solid-state electrolyte layer comprises an organic polymer, lithium salt, a nano inorganic solid electrolyte, a biner and a wetting agent, wherein, based on the total weight of the composite solid electrolyte layer, the content of the organic polymer is 5 - 80 wt%, the content of the lithium salt is 5 - 50 wt%, thecontent of the nano inorganic solid electrolyte is 10 - 85 wt%, the content of the binder is 1 - 12 wt%and the content of the wetting agent is 0.1 - 0.5 wt%.

Description

Technical field [0001] The present disclosure relates to the field of battery positive electrodes, and in particular to a solid electrolyte positive electrode and a solid battery containing the positive electrode. 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 liquid leakage, corrosion of electrodes, combustion and explosion, and there are greater safety risks. [0003] Solid electrolyte batteries have gradually entered the public eye due to the characteristics of organic liquid batteries and higher safety. Solid electrolytes include polymer electrolytes, inorganic electrolytes and composite electrolytes. Polymer electrolytes have low conductivity at room temperature and higher costs of inorganic solid electrolytes. However, the cu...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/058H01M10/0525B82Y30/00
CPCB82Y30/00H01M10/0525H01M10/056H01M10/058H01M2220/20H01M2300/0065H01M2300/0091Y02E60/10Y02P70/50
Inventor 周素霞王晓明杨浩田钟燕琼
Owner JIANGSU ADVANCED MATERIAL TECH CO LTD
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