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Solid electrolyte membrane of lithium-sulfur battery, preparation method of solid electrolyte membrane and lithium-sulfur battery

A solid-state electrolyte membrane and lithium-sulfur battery technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, solid electrolytes, etc., can solve problems such as metal lithium deactivation, active material loss, and increased electrolyte viscosity

Active Publication Date: 2020-08-04
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, under the action of electric field and concentration gradient in the long-chain lithium polysulfide, it will migrate back and forth between the positive and negative electrodes, and the long-chain LiS x Migration into the electrolyte will increase the viscosity of the electrolyte and reduce the ion conductivity; long-chain LiS x Migration to the separator will cause the membrane to block pores, increase internal resistance, and deteriorate battery kinetics; long-chain LiS x With extremely strong reactivity, migrating to the negative electrode will destroy the solid electrolyte interface film (SEI film) of the negative electrode. In addition, the long-chain LiS x It will also directly react with metal lithium to deactivate metal lithium and pulverize it.
In summary, the shuttle effect (Shuttle effect), known as polysulfide, leads to the loss of active materials and the waste of electrical energy

Method used

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  • Solid electrolyte membrane of lithium-sulfur battery, preparation method of solid electrolyte membrane and lithium-sulfur battery
  • Solid electrolyte membrane of lithium-sulfur battery, preparation method of solid electrolyte membrane and lithium-sulfur battery
  • Solid electrolyte membrane of lithium-sulfur battery, preparation method of solid electrolyte membrane and lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 85g of PEO (molecular weight: 200,000) in 1000ml of acetonitrile, stir at 40°C for 24h, then add 5g of TiO 2 Particles and 10g of LiTFSI salt were stirred and dispersed for 2 hours to obtain a composite electrolyte emulsion. Coat it on the PTFE substrate while it is hot, the coating thickness is 100μm, after standing at 40°C for 48h, place it in a place filled with CaCl 2 Dry in a desiccator for 24 hours. Then vacuum-dry at 80° C. for 72 hours, and place it in a phosphorus pentoxide dryer for 72 hours to obtain a solid electrolyte membrane.

Embodiment 2

[0032] Dissolve 90g of PEO (molecular weight: 200,000) in 1000ml of acetonitrile, stir at 40°C for 24h, then add 2g of TiO2 Particles and 8g LiTFSI salt were stirred and dispersed for 2 hours to obtain a composite electrolyte emulsion. Coat it on the PTFE substrate while it is hot, the coating thickness is 100μm, after standing at 40°C for 48h, place it in a place filled with CaCl 2 Dry in a desiccator for 24 hours. Then vacuum-dry at 80° C. for 72 hours, and place it in a phosphorus pentoxide dryer for 72 hours to obtain a solid electrolyte membrane.

Embodiment 3

[0034] Dissolve 50g of PEO (molecular weight: 200,000) in 1000ml of acetonitrile, stir at 40°C for 24h, then add 20g of TiO 2 Particles and 30g LiTFSI salt were stirred and dispersed for 2 hours to obtain a composite electrolyte emulsion. Coat it on the PTFE substrate while it is hot, the coating thickness is 100μm, after standing at 40°C for 48h, place it in a place filled with CaCl 2 Dry in a desiccator for 24 hours. Then vacuum-dry at 80° C. for 72 hours, and place it in a phosphorus pentoxide dryer for 72 hours to obtain a solid electrolyte membrane.

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Abstract

The invention provides a solid electrolyte membrane of a lithium-sulfur battery. The solid electrolyte membrane comprises a polymer with polar functional groups and inorganic particles capable of catalyzing and adsorbing polysulfide. The invention also provides a preparation method of the solid electrolyte membrane and the lithium-sulfur battery comprising the solid electrolyte membrane. The polarfunctional groups in the polymer in the solid electrolyte membrane can be adsorbed with positive ions in inorganic particles (PSCC) capable of catalyzing and adsorbing the polysulfide in an active manner; the uniform distribution of charges is stabilized; meanwhile, PSCC cations are helped to be chelated; however, when polysulfide (PS) anions migrate and diffuse to the vicinity of the electrolytemembrane, due to the fact that strong adsorption-catalysis-conversion acting force exists between the PSCC cations and the PS anions, the migration of the PS anions can be inhibited at the same time,the PS anion conversion is improved, and the lithium-ion transmission efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-sulfur battery solid electrolyte membrane, a preparation method thereof and a lithium-sulfur battery. Background technique [0002] The theoretical capacity and specific energy of lithium-sulfur batteries reach 1675mAh / g and 2600Wh / kg, which are much higher than the energy density (<300Wh / kg) of iron-lithium or ternary batteries widely used in commerce, and elemental sulfur is abundant in the earth , has the characteristics of low price and environmental friendliness. Therefore, lithium-sulfur batteries are widely considered to be the development direction of next-generation high-energy-density batteries, and they are also a research hotspot for high-energy-density batteries. [0003] However, in view of the electrochemical reaction mechanism of lithium-sulfur battery dissolution-deposition, elemental sulfur reacts with lithium ions during ...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/058H01M10/052H01M10/42
CPCH01M10/056H01M10/058H01M10/052H01M10/4235H01M2300/0091H01M2300/0094H01M2300/0065Y02E60/10Y02P70/50
Inventor 彭祖铃许博伟刘可禄
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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