Battery cell hot-pressing integrally-molded solid-state battery and preparation method thereof

A solid-state battery and solid-state electrolyte technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of large interface impedance and poor cycle stability, reduce interface impedance, improve effective contact, and ease interface The effect of stress

Inactive Publication Date: 2020-06-26
天津中电新能源研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of large interface impedance and poor cycle stability existing in solid-state batteries, the present invention provides a solid-state battery formed by hot-pressing integrated batteries and a preparation method thereof. The prepared solid-state battery is suitable for industrial production and effectively reduces the interface of solid-state batteries. impedance, improving cycle stability

Method used

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  • Battery cell hot-pressing integrally-molded solid-state battery and preparation method thereof

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preparation example Construction

[0045] The preparation of the positive electrode: the positive electrode slurry containing polymer is coated on the positive electrode current collector to prepare the positive electrode containing polymer; the positive electrode active material, polymer, lithium salt, inorganic electrolyte, conductive agent, positive electrode binder and organic solvent Mixing in a certain proportion, ball milling or stirring to obtain a positive electrode slurry with a certain viscosity, coating the positive electrode slurry on the positive electrode current collector, and drying to obtain a positive electrode containing polymer.

[0046] Preparation of the negative electrode: preparing the negative electrode or preparing the metal lithium negative electrode; mixing the negative electrode active material, the conductive agent, the negative electrode binder and the aqueous solvent to obtain the negative electrode slurry by ball milling or stirring, and coating the negative electrode slurry on the ...

Embodiment 1

[0122] a) Weigh 7g LiNi 0.85 Co 0.1 Al 0.05 O 2 , 0.44g SP, 7.3g PVDF, 4.38g NBR, 0.44g LiTFSI were mixed, 0.4g DMAC solvent was added, and the mixture was stirred at 35°C for 6 hours to obtain the positive electrode slurry. The positive electrode slurry was coated on the aluminum foil with a 0.3mm doctor blade and dried at 60°C , Then vacuum drying at 100°C for 12h.

[0123] b) Weigh 5g graphite, 0.29gSP, 3.27gCMC, 0.62gSBR, 3.5g water and mix them with ball milling or stirring at room temperature to obtain the negative electrode slurry, and then use a 0.2mm spatula to coat the negative electrode slurry on the copper foil, 80℃ Dry, and then vacuum dry at 120°C for 12 hours.

[0124] c) Weigh 3g NBR, 1.5g LiTFSI, 0.05g succinonitrile in 20g THF, stir at 25°C to obtain a uniform solid electrolyte solution.

[0125] d) Coating the solid electrolyte solution obtained in c) on the negative electrode obtained in b) and drying at 40° C. for 8 hours.

[0126] e) Weigh 3g NBR, 7g LiTFSI, 6g ...

Embodiment 2

[0130] a) Weigh 7g LiNi 0.85 Co 0.1 Al 0.05 O 2 , 0.16g SP, 3.89g NBR, 0.23g LiTFSI were mixed and added 3g DMAC solvent, stirred at 35°C for 6h to obtain the positive electrode slurry. Use a 0.3mm doctor blade to coat the positive electrode slurry on the aluminum foil, dry at 60°C, and then vacuum at 100°C Dry for 12h.

[0131] b) Weigh 5g graphite, 0.11gSP, 1.17gCMC, 0.11gSBR, 5g water and mix them with ball milling or stirring at room temperature to obtain the negative electrode slurry, and then use a 0.2mm scraper to coat the negative electrode slurry on the copper foil, and bake at 80℃ After drying, vacuum drying at 120°C for 12 hours.

[0132] c) Weigh 3g of NBR and 1.5g of LiTFSI, dissolve in 25g of DMAC, stir at 25°C to obtain a uniform solid electrolyte solution.

[0133] d) Coating the solid electrolyte solution obtained in c) on the negative electrode obtained in b) and drying at 60° C. for 8 hours.

[0134] e) Weigh 3g of NBR, 3g of LiTFSI, 6g of LLZTO, 5mg of polymethyls...

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Abstract

The invention relates to a battery cell hot-pressing integrally-molded solid-state battery and a preparation method thereof. The solid electrolyte of the solid-state battery comprises a polymer, and two functions of the electrolyte and a diaphragm are simultaneously achieved in the battery. The solid-state battery is fused into a whole through a hot-pressing process, so that the integrated bondingis realized in the solid-state battery, the effective interface contact between electrode materials and between the electrode materials and different functional layers, such as the solid electrolyte,etc., can be improved, a space charge layer generated by the insufficient solid-phase contact is eliminated, the interface impedance is reduced, the battery coulombic efficiency is improved, and theinterface stress generated by the volume change of the electrode in the charging and discharging process is relieved to a certain extent.

Description

Technical field [0001] The invention belongs to the technical field of solid-state batteries, and in particular relates to a solid-state battery formed by hot-pressing integrally formed electric cores and a preparation method thereof. Background technique [0002] As the market's demand for high specific energy batteries continues to increase, battery safety issues have become increasingly prominent, and solid-state batteries have received widespread attention due to their intrinsic safety properties. Traditional lithium-ion batteries use organic electrolyte, so the large amount of heat generated during other abnormal working conditions such as overcharge and internal short circuit will cause the electrolyte to quickly vaporize, which may cause the battery to explode and catch fire. The fundamental solution to these potential safety hazards is to develop solid-state electrochemical energy storage devices, that is, to replace organic electrolytes with non-volatile solid electrolyt...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 桑林刘婧蔡超刘兴江丁飞王磊郑涛
Owner 天津中电新能源研究院有限公司
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