Solid-state electrolyte and solid-state battery containing same

A solid-state electrolyte and battery technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, solid electrolytes, etc. It can solve the problems that all solid-state lithium-ion batteries cannot be assembled, affect the electrochemical performance of solid-state lithium batteries, and lithium ions cannot pass smoothly, etc. problem, to achieve the effect of solving poor interface contact, reducing transmission impedance, and improving interface performance

Active Publication Date: 2022-02-01
ZHUHAI COSMX POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxide solid electrolytes are represented by NASICON type (LATP, LAGP); Garnet type (LLZO, LLZTO, etc.) solid electrolytes. During the discharge process, lithium ions cannot pass through the positive electrode / electrolyte and electrolyte / negative electrode interfaces smoothly, which seriously affects the electrochemical performance of solid-state lithium batteries.
In particular, the surface of the lithium metal negative electrode and the garnet-type solid-state electrolyte is not wetted, so that there is a large interface resistance between the electrode material and the solid-state electrolyte material, and it cannot be assembled into a high-performance all-solid-state lithium-ion battery.

Method used

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  • Solid-state electrolyte and solid-state battery containing same
  • Solid-state electrolyte and solid-state battery containing same
  • Solid-state electrolyte and solid-state battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Preparation of crown ethers COFs-1:

[0084] S1: In a glove box filled with argon, the LLZTO (Li 6.75 La 3 Zr 1.75 Ta 0.25 o 12 ) the surface of the electrolyte, and then use anhydrous tetrahydrofuran solvent to wash off the residual impurities on the surface of the electrolyte;

[0085] S2: Place the clean LLZTO electrolyte treated in step S1 in a reaction flask containing 0.024 mmol 1,3,6,8-tetrakis-(p-aminophenyl)-pyrene and 10 mL o-dichlorobenzene solution, and Stir at 50°C for 1 hour;

[0086] S3: Add 0.024mmol of B to the above solution 18 C 6 And 0.1mL 6M acetic acid solution, and continue to stir and react at 50°C for 24h;

[0087] S4: The unreacted residue was washed away with anhydrous tetrahydrofuran, and heated at 50° C. for 1 h to remove the residual solvent. ;

[0088] S5: Add a crystallization transition solvent consisting of 13.5 mL of o-dichlorobenzene and 1.5 mL of n-butanol to the COF@LLZTO material prepared in step S4, and simultaneously ad...

Embodiment 2

[0093] Preparation of crown ethers COFs-2:

[0094] S1: In a glove box filled with argon, the LLZTO (Li 6.75 La 3 Zr 1.75 Ta 0.25 o 12 ) the surface of the electrolyte, and then use anhydrous tetrahydrofuran solvent to wash away possible residual impurities on the surface of the electrolyte;

[0095] S2: Place the clean LLZTO electrolyte treated in step S1 in a reaction flask containing 0.024 mmol 1,3,6,8-tetrakis-(p-aminophenyl)-pyrene and 10 mL o-dichlorobenzene solution, and Stir at ℃ for 1 h;

[0096] S3: Add 0.024mmol of B to the above solution 24 C 8 And 0.1mL 6M acetic acid solution, and continue to stir and react at 50°C for 24h;

[0097] S4: wash off the unreacted residue with anhydrous tetrahydrofuran, and heat at 50° C. for 1 h to remove the residual solvent;

[0098] S5: Add a crystallization transition solvent consisting of 13.5 mL of o-dichlorobenzene and 1.5 mL of n-butanol to the COF@LLZTO material prepared in step S4, and simultaneously add 1.5 mL of ...

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Abstract

The invention discloses a solid-state electrolyte and a solid-state battery containing the same. According to the solid-state electrolyte and the solid-state battery containing the same, a novel polymer material (crown ether organic covalent skeleton structure material (COFs)) is synthesized as a modification layer to modify two sides of an inorganic solid-state electrolyte and/or an organic solid-state electrolyte in situ; and a final solid-state battery structure is a positive plate-polymer-inorganic solid electrolyte sandwich-like structure and/or an organic solid electrolyte-polymer-negative plate sandwich-like structure. The modification method provided by the invention can effectively improve the interface performance between a solid electrolyte and an electrode in situ, so that a prepared polymer solid electrolyte coating can significantly increase the transmission channel of lithium ions on a positive electrode/inorganic ceramic chip/negative electrode interface, and therefore, the transmission impedance of a solid-solid interface is reduced, the inorganic solid electrolyte and/or organic solid electrolyte are/is protected from being reduced by the metal lithium negative electrode, and the electrochemical performance of the solid-state battery is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a solid electrolyte with improved interface performance, a preparation method thereof and a solid-state battery containing the solid electrolyte. Background technique [0002] Traditional lithium-ion batteries use flammable liquid electrolytes and graphite as the negative electrode, which not only has low energy density, but also has potential safety hazards. Solid-state batteries have attracted considerable attention in next-generation energy storage devices due to their higher energy density and superior safety performance than current state-of-the-art Li-ion batteries. [0003] However, after the electrolyte is changed from liquid to solid, the lithium battery system transforms from the electrode material-electrolyte solid-liquid interface to the electrode material-solid electrolyte solid-solid interface. There is no wettability between the solid-solid interfaces, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0562H01M10/0565H01M10/058H01M10/0525H01M10/42
CPCH01M10/0562H01M10/0565H01M10/056H01M10/058H01M10/0525H01M10/4235H01M2300/0065H01M2300/0068H01M2300/0082H01M2300/0091H01M2300/0088Y02P70/50
Inventor 董德锐赵伟张赵帅李素丽
Owner ZHUHAI COSMX POWER SUPPLY CO LTD
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