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Lithium-sulfur battery electrolyte and application thereof

A lithium-sulfur battery and electrolyte technology, which is applied in the direction of lithium batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of unstable sulfide ceramics, battery inoperability, and large contact resistance, so as to improve capacity performance and cycle Effects of stability, dissolution inhibition, and contact resistance reduction

Inactive Publication Date: 2018-12-04
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the research of solid electrolytes based on two types of sulfide and oxide ceramic electrolytes, sulfide ceramics are unstable in the air, and the preparation is difficult and costly; the contact resistance between oxide ceramics and electrodes is too large, and the battery cannot work

Method used

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  • Lithium-sulfur battery electrolyte and application thereof
  • Lithium-sulfur battery electrolyte and application thereof
  • Lithium-sulfur battery electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) LAGP (Li 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 ) powder, after molding the LAGP powder, carry out cold isostatic pressing to obtain a green body, and finally sinter the green body to obtain a LAGP ceramic sheet;

[0039] (2) 1M lithium salt LiN(SO 2 CF 3 ) 2 Dissolve in fluoroether 1,3-(1,1,2,2-tetrafluoroethoxy)propane (4ml), cyclic ether 1,3-dioxolane (0.5ml) and linear ether glycol In the mixed solvent of dimethyl ether (0.5ml), obtain liquid electrolyte (such as Figure 7 middle a);

[0040] (3) Add the liquid electrolyte to the glass fiber membrane, and then paste it on both sides of the LAGP ceramic sheet as the electrolyte of the battery;

[0041] (4) Assemble a button-type lithium-sulfur battery. Dry the sulfur-containing S / C slurry and apply it on aluminum foil, cut into discs with a diameter of 12mm as the positive electrode, lithium metal as the negative electrode, and the electrolyte obtained in step (3), assemble the battery in an argon glove box .

...

Embodiment 2

[0045] (1) Prepare LLZTO (Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 ) powder, after molding the LLZTO powder, carry out cold isostatic pressing to obtain a green body, preferably sintering the green body to obtain an LLZTO ceramic sheet;

[0046] (2) 1M lithium salt LiN(SO 2 CF 3 ) 2 Dissolve in fluoroether 1,3-(1,1,2,2-tetrafluoroethoxy)propane (4ml), cyclic ether 1,3-dioxolane (0.5ml) and linear ether glycol In the mixed solvent of dimethyl ether (0.5ml), obtain electrolytic solution;

[0047] (3) Add the liquid electrolyte to the glass fiber membrane, and then paste it on both sides of the LLZTO ceramic sheet as a mixed electrolyte;

[0048] (4) Assemble a button-type lithium-sulfur battery. Dry the sulfur-containing S / C slurry and apply it on the aluminum foil, cut it into a disc with a diameter of 12mm as the positive electrode, lithium metal as the negative electrode, and use the mixed electrolyte obtained in step (3) as the diaphragm, in an argon glove box Assemble the b...

Embodiment 3

[0064] (1) LAGP (Li 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 ) powder, after molding the LAGP powder, carry out cold isostatic pressing to obtain a green body, and finally sinter the green body to obtain a LAGP ceramic sheet;

[0065] (2) 1M lithium salt LiN(SO 2 CF 3 ) 2 Dissolve in 1,2-bis(1,1,2,2-tetrafluoroethoxy)ethane (4ml), cyclic ether 1,3-dioxolane (0.5ml) and linear ether glycol In the mixed solvent of dimethyl ether (0.5ml), obtain liquid electrolyte;

[0066] (3) Add the liquid electrolyte to the glass fiber membrane, and then paste it on both sides of the LAGP ceramic sheet as the electrolyte of the battery;

[0067] (4) Assemble a button-type lithium-sulfur battery. Dry the sulfur-containing S / C slurry and apply it on aluminum foil, cut into discs with a diameter of 12mm as the positive electrode, lithium metal as the negative electrode, and the electrolyte obtained in step (3), assemble the battery in an argon glove box .

[0068] Battery performance:

[0069] Th...

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Abstract

The invention relates to a lithium sulfur battery electrolyte and application thereof. The lithium sulfur battery electrolyte comprises an oxide ceramic electrolyte and a liquid electrolyte, wherein the liquid electrolyte is an electrolyte containing fluorinated ether solvents, and the electrolyte containing fluorinated ether solvents comprises a lithium salt, a solvent, and at least one fluorinated ether solvent; and the general chemical formula of the fluorinated ether solvents is (MF<x>H<3-x>)<m>-O-(MF<y>H<3-y>)<n>, M is C or Si , x is no less than 0 and no more than 3, y is no less than0 and no more than 3, the sum of x and y is no less than 1, m is no less than 1 and no more than 10, n is no less than 1 and no more than 10, and i is no less than 1 and no more than 10. According tothe invention, the electrolyte containing the fluorinated ether solvents is used as an interface modification layer, so the contact resistance between the ceramic electrolyte and electrodes is reduced, the dissolution of an intermediate product from a positive electrode is inhibited, the utilization ratio of active materials is improved, and the capacity performance and cycle stability of the battery are enhanced; and a preparation method is simple and feasible.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and specifically relates to the application of oxide ceramics and liquid electrolytes containing fluorinated ether solvents as lithium-sulfur battery electrolytes. Background technique [0002] In order to alleviate the energy shortage and solve the problem of environmental pollution, renewable energy and new energy vehicles are being vigorously developed. These measures put forward higher requirements for energy storage batteries, especially lithium secondary battery technology with high energy density. However, the existing mature lithium secondary battery technology uses transition metal oxides as the positive electrode, and the energy density of the battery is close to the theoretical limit, which is still difficult to meet the market's requirements for high energy density. Lithium-sulfur batteries, based on the conversion reaction mechanism, use elemental sulfur as the active material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0562H01M10/0566H01M10/0569
CPCH01M10/052H01M10/0562H01M10/0566H01M10/0569Y02E60/10
Inventor 温兆银谷穗靳俊王庆黄晓王清松钱荣
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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