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Carbohydrate modified lithium conductive polymer/inorganic hybrid electrolyte and application thereof

A lithium polymer and electrolyte technology, which is applied in the direction of non-aqueous electrolytes, solid electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of flowability toxicity, restrict battery structure design, reduce energy density, etc., and achieve improved conductivity, excellent Mechanical properties, performance improvement effect

Inactive Publication Date: 2017-08-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional electrolytes are mainly composed of carbonate solutions, which are fluid, flammable, toxic, and explosive, which is an important cause of lithium battery safety problems. It also restricts the structural design of the battery and reduces the energy density.

Method used

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  • Carbohydrate modified lithium conductive polymer/inorganic hybrid electrolyte and application thereof

Examples

Experimental program
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Effect test

Embodiment 2

[0030] Take 0.5g of starch and 10g of dimethyl sulfoxide in a flask, stir at 80°C under the protection of argon for 1 hour, then add carboxypolyethylene glycol with a molar ratio of 2:3 to the starch glucose unit, and react for 12 hours. The product is used directly to configure the electrolyte. Mix 2 g of the solution obtained from the reaction with 0.04 g of LiTFSI evenly, drop the obtained solution on the surface of the plastic film substrate, place it in a glove box and dry it at 60°C for 12 hours to obtain a solid electrolyte film with a conductivity of 4.2×10 -5 S / cm.

Embodiment 3

[0032] Take 0.5 g of sucrose and 10 g of pyridine in a flask, stir at 45°C under the protection of argon for 1 hour, and then add BH with a molar ratio of 8:3 to sucrose dropwise. 3 .THF solution, reacted for 12h, and the product solution was directly used to prepare electrolyte. 2 g of the reaction solution was mixed with 0.1 g of PEO with a molecular weight of 4 million and 0.04 g of LiTFSI and stirred evenly to form a gel. The gel was coated on the sulfur positive electrode, and it was left to stand in an argon glove box for 5 minutes. The metal Li was used as the negative electrode to assemble a button battery. The battery can obtain an initial discharge capacity of 1452mAh / g.

Embodiment 4

[0034] Take 0.5 g of agar, stir it at 95 °C under the protection of argon for 1 hour to melt it, and then add BH with a molar ratio of 1:3 to its hydroxyl group 3 .THF solution, reacted for 12h. The product obtained was ground into a powder. 0.02g of the product, 0.2g of PEO and 0.26g of LiTFSI were dissolved in acetonitrile, and after stirring evenly, the solvent evaporated into a solid electrolyte film with a conductivity of 3.8×10 -5 S / cm.

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Abstract

The invention discloses a carbohydrate modified lithium conductive polymer / inorganic hybrid electrolyte and application thereof. The electrolyte comprises a carbohydrate modified lithium conductive polymer and a lithium salt, wherein the carbohydrate modified lithium conductive polymer is obtained by crosslinking reaction or direct mixing of a carbohydrate compound and a lithium conductive polymer and / or a lithium conductive micromolecule compound. The electrolyte is compatible with high conductivity of an inorganic material and flexibility of a polymer material, has high lithium ion conductivity and good processability, and is suitably used for preparing a lithium ion battery, a lithium-sulfur or lithium-air battery and the like with large capacity and good cycle property; and the electrolyte is low in cost and is simple to prepare, and the selection range and the application field of a lithium battery material are expanded.

Description

technical field [0001] The invention relates to an electrolyte material, in particular to a carbohydrate-modified lithium-conducting polymer / inorganic hybrid electrolyte and its application in lithium-ion batteries, lithium-sulfur batteries or lithium-air batteries, belonging to the technical field of lithium batteries. Background technique [0002] Since it was put into the market in 1991, lithium-ion batteries have been widely used in small and medium-sized battery fields such as computers, notebook computers, power tools, and electric bicycles. With the development of large-scale battery applications such as electric vehicles and energy storage, higher requirements are placed on the energy density and safety performance of batteries. Traditional electrolytes are mainly composed of carbonate solutions, which are fluid, flammable, toxic, and explosive, which is an important cause of lithium battery safety problems. It also restricts the structural design of the battery and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052H01M10/0525H01M12/08
CPCH01M10/052H01M10/0525H01M10/0565H01M12/08H01M2300/0082Y02E60/10
Inventor 刘晋林月王旭明刘斯斯程昀
Owner CENT SOUTH UNIV
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