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An all-solid-state lithium-sulfur/sodium-sulfur battery with halide as electrode active material and catalyst

A technology for electrode active materials and positive electrode active materials, which is applied in the field of lithium-sulfur or sodium-sulfur batteries, can solve the problems of low positive electrode active material loading, poor cycle performance, and low energy density, so as to improve the utilization rate of active materials and increase energy. Density, effect of improving cycle performance

Active Publication Date: 2021-01-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of low first cycle coulombic efficiency, low positive electrode active material loading, low discharge specific capacity, low energy density, poor cycle performance and high preparation cost in all-solid-state lithium-sulfur or sodium-sulfur batteries in the prior art, the purpose of the present invention is to It is to provide an all-solid-state lithium-sulfur or sodium-sulfur battery containing halogen inorganic salt active additive materials. The halogen inorganic salt exhibits a high charge and discharge capacity platform (2.8-4.5V) and high voltage in the lithium-sulfur or sodium-sulfur battery Under the potential, it has the function of catalyzing the "resurrection" of polysulfide compounds. Not only can it provide a certain capacity value and energy density, but also the redox mediator formed during the charging process can catalyze or promote the "deactivation" of lithium polysulfide (especially conductive Poor lithium sulfide, sodium sulfide, or lithium persulfide, sodium persulfide) can be reversibly converted into sulfur element, so that a part of the "dead sulfur" that has lost its reactivity can be reactivated, effectively improving the lithium-sulfur or sodium-sulfur battery cycle performance. Low first-cycle Coulombic efficiency and active material utilization

Method used

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  • An all-solid-state lithium-sulfur/sodium-sulfur battery with halide as electrode active material and catalyst
  • An all-solid-state lithium-sulfur/sodium-sulfur battery with halide as electrode active material and catalyst
  • An all-solid-state lithium-sulfur/sodium-sulfur battery with halide as electrode active material and catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of positive electrode: 0.7g elemental sulfur and 0.2g Super P were magnetically stirred in 10mL acetonitrile at 25°C for 10min to obtain mixture 1, 0.1g PEO (molecular weight 4000000) was dissolved in acetonitrile solvent, and the above mixture 1 was added after ultrasonication for 10min. Then it is coated on an aluminum foil and placed in an oven at 50°C, and dried with a volatile solvent for 24 hours to obtain a positive electrode.

[0037] Preparation of electrolyte membrane 1: Dissolve 0.08gMIL-53(Al), 0.02gLiI and 0.5gLiTFSI in 60mL of acetonitrile, stir for 10h, add 0.4gPEO, stir for 24h, evaporate the solvent at room temperature for 8h, and obtain polymer electrolyte membrane 1 .

[0038] Preparation of electrolyte membrane 2: Dissolve 0.08g MIL-53(Al) and 0.7g LiTFSI in 20mL of acetonitrile, stir for 12h, add 0.4gPEO, stir for 24h, evaporate the solvent at room temperature for 8h, and obtain polymer electrolyte membrane 2.

[0039] The prepared posi...

Embodiment 2

[0041] Preparation of positive electrode: 0.7g elemental sulfur and 0.2g Super P were magnetically stirred in 10mL acetonitrile at 25°C for 10min to obtain mixture 1, 0.1g PEO (molecular weight 4000000) was dissolved in acetonitrile solvent, and the above mixture 1 was added after ultrasonication for 10min. Then it is coated on an aluminum foil and placed in an oven at 50°C, and dried with a volatile solvent for 24 hours to obtain a positive electrode.

[0042] Preparation of electrolyte membrane 1: Dissolve 0.08gMIL-53(Al) and 0.7gLiTFSI in 20mL of acetonitrile, stir for 12h, add 0.4gPEO, stir for 24h, evaporate the solvent at room temperature for 8h, and obtain polymer electrolyte membrane 1.

[0043] Preparation of electrolyte membrane 2: Dissolve 0.08g MIL-53(Al) and 0.7g LiTFSI in 20mL of acetonitrile, stir for 12h, add 0.4gPEO, stir for 24h, evaporate the solvent at room temperature for 8h, and obtain polymer electrolyte membrane 2.

[0044] The prepared positive electro...

Embodiment 3

[0046] Preparation of positive electrode: 0.7g elemental sulfur and 0.2g Super P were magnetically stirred in 10mL acetonitrile at 25°C for 10min to obtain mixture 1, 0.1g PEO (molecular weight 4000000) was dissolved in acetonitrile solvent, and the above mixture 1 was added after ultrasonication for 10min. Then it is coated on an aluminum foil and placed in an oven at 50°C, and dried with a volatile solvent for 24 hours to obtain a positive electrode.

[0047] Preparation of electrolyte membrane 1: Dissolve 0.08g of MIL-53(Al), 0.02g of LiI and 0.5g of LiTFSI in 60mL of acetonitrile, stir for 10h, add 0.4g of PEO, stir for 24h, and evaporate the solvent at room temperature for 8h to obtain a polymer electrolyte membrane 1.

[0048] Preparation of electrolyte membrane 2: Dissolve 0.08g MIL-53(Al) and 0.7g LiTFSI in 20mL of acetonitrile, stir for 12h, add 0.4gPEO, stir for 24h, evaporate the solvent at room temperature for 8h, and obtain polymer electrolyte membrane 2.

[0049...

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Abstract

The invention discloses a full solid state lithium-sulfur / sodium-sulfur battery using halides as electrode active substances and catalysts. The battery comprises a positive electrode, a solid electrolyte film and a negative electrode, wherein the work voltage is 1.0 to 4.5V; the positive electrode material and / or the solid electrolyte contains halogen inorganic salt; through the addition of halogen inorganic salt materials which have a high-voltage charging and discharging platform and can actively catalyze the polysulfide conversion and provide the reversible volume output by itself into thepositive electrode and / or solid electrolyte, the comprehensive performance such as the specific capacity value, the circulation performance, the coulombic efficiency, the energy density and the like of the battery system can be obviously improved. The battery has the advantages that the preparation method of the battery is simple; the process conditions are mild; the mass production can be realized; the addition of bonding agents is not needed, and the like. The large-scale commercial production requirements are met.

Description

technical field [0001] The invention relates to an all-solid-state lithium-sulfur battery or a sodium-sulfur battery, in particular to an all-solid-state lithium-sulfur / sodium-sulfur battery with high stability, high coulombic efficiency and high energy density in which halides are used as electrode active materials and catalysts, The invention belongs to the technical field of lithium-sulfur or sodium-sulfur batteries. Background technique [0002] With the increasing demand for power batteries, the development of new battery systems with high discharge specific capacity, high energy density, high cycle stability, coulombic efficiency, and high safety has become the direction of future battery technology development. Solid-state batteries have been extensively studied as next-generation batteries due to their high safety, light weight, and high energy density. Li-S / Na-S batteries have a high theoretical specific capacity (1675mAh g -1 / 1165mAh g -1 ) and energy density (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/38H01M4/583H01M4/62H01M10/0562H01M10/052
CPCH01M4/364H01M4/38H01M4/5815H01M4/582H01M4/583H01M4/62H01M10/052H01M10/0562H01M2300/0091H01M2300/0094Y02E60/10
Inventor 刘晋张智李劼黄辰翔
Owner CENT SOUTH UNIV
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