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Multilayer electrode-electrolyte components and their production methods

A technology of multi-layer components and solid electrolyte layers, which is applied in the field of electrochemical batteries and can solve problems such as difficulties in the preparation of solid-state cathodes

Pending Publication Date: 2021-12-10
HYDRO QUEBEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Nevertheless, the final preparation of solid-state cathodes remains difficult because sintering of the cathode material in the presence of oxygen is likely to burn off any carbon present.

Method used

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  • Multilayer electrode-electrolyte components and their production methods
  • Multilayer electrode-electrolyte components and their production methods
  • Multilayer electrode-electrolyte components and their production methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] (a) Solid electrolyte-cathode assembly

[0119] Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (0.75 g, LAGP) powder was cold pressed under air in a 16 mm titanium-zirconium-molybdenum (TZM) mold with a 5 ton (5000 kg) weight to form LAGP electrolyte pellets. 0.75 g of carbon-coated LiFePO 4 (45% by weight), LAGP (45% by weight) and vapor grown carbon fibers (VGCF, 10% by weight) were added on the LAGP electrolyte pellets to form a bilayer material. This bilayer material was then pressed in a hot press at 650° C. for 1 hour under an inert atmosphere with a pressure of 2 tons (2000 kg) to produce a solid electrolyte-cathode assembly.

[0120] (b) All-solid-state electrochemical battery

[0121] The solid electrolyte-cathode assembly obtained in (a) was assembled with a lithium metal membrane and a protective layer comprising PEO and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) (O / Li molar ratio 20:1) on between the lithium metal anode and the ceramic electrolyte.

[0122...

Embodiment 2

[0124] LAGP (85% by weight) and 25 (poly(ethylene carbonate), 15% by weight) dispersed in N,N-dimethylformamide or N,N-dimethylformamide:tetrahydrofuran (1:1) mixture. The resulting mixture was applied to a polypropylene film with a spatula. The film was then dried at 50°C for 2 hours.

[0125] by using Mixer mixing LAGP (45%), LiFePO 4 (45%) and graphite (10%) to obtain mixed cathode materials to prepare cathodes. This hybrid cathode material (85%) and 25 (15%) dispersed in N,N-dimethylformamide or N,N-dimethylformamide: tetrahydrofuran (1:1) mixture. The resulting mixture was applied as a film on a polypropylene film with a doctor blade. The cathode thus formed was dried at 50°C for 2 hours.

[0126] The self-supporting LAGP electrolyte membrane and cathode membrane were then separated from the polypropylene membrane and laminated together at 80° C. to reduce porosity and obtain a ceramic-cathode membrane with a thickness of 100 to 400 μm. The film was then ponced...

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Abstract

The invention relates to multilayer components comprising a solid electrolyte layer and a solid electrode layer, both comprising ceramic particles while being free of polymer as well as to electrochemical cells comprising same. The methods for preparing these multilayer components are also disclosed, which use a hot pressing step.

Description

[0001] related application [0002] This application claims priority under applicable law to U.S. Provisional Patent Applications Nos. 62 / 842,963 and 62 / 955,679, filed May 3, 2019, and December 31, 2019, respectively, the contents of which are hereby incorporated in their entirety for all purposes Incorporated herein by reference. technical field [0003] The technical field relates generally to methods of preparing solid multilayer components comprising electrode layers and electrolyte layers, to components obtained by these methods and to electrochemical cells comprising them. [0004] technical background [0005] Liquid electrolytes based on flammable liquids (such as ethylene carbonate or diethyl carbonate) widely used in lithium-ion batteries can ignite, for example, when the temperature in the battery increases (Guerfi ​​et al., J. Power Soruce 195, 845–852 (2010)) and thus often lead to unsafe battery packs. These liquid electrolytes also lead to dendrite growth and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M10/0525H01M6/18
CPCH01M2004/028H01M4/043H01M4/0471H01M4/136H01M4/1397H01M4/5825H01M4/62H01M4/382H01M2004/027H01M4/134H01M4/1395H01M10/052H01M10/0562H01M10/0565H01M2300/0068H01M2300/0082H01M50/403H01M50/434H01M50/443H01M50/46H01M50/414H01M50/497H01M10/0585H01M4/139H01M4/625H01M4/131H01M4/364H01M4/583H01M10/0525H01M10/058
Inventor A·保莱拉S·萨沃伊G·吉拉尔A·福兰德朱文A·格尔菲K·扎吉布
Owner HYDRO QUEBEC CORP