Reference electrolyte capable of improving cycling performance of lithium-sulfur battery and preparation method

A technology of benchmark electrolyte and cycle performance, applied in the field of electrolyte preparation, can solve the problems of cumbersome design method, troublesome cathode synthesis, etc., and achieve the effect of good anode lithium protection effect, material saving and low price.

Inactive Publication Date: 2018-03-20
HUARUI XINXIANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these design methods are cumbersome, and the synthesis of the positive electrode is troublesome.

Method used

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  • Reference electrolyte capable of improving cycling performance of lithium-sulfur battery and preparation method

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preparation example Construction

[0015] A method for preparing a benchmark electrolyte that can improve the cycle performance of lithium-sulfur batteries, comprising the steps of:

[0016] Step 1: Under the condition that the interior of the glove box is in an argon atmosphere, and the internal water and oxygen content value does not exceed the standard, take two solvents and mix them evenly to make an ether solvent; the water content value is less than 1ppm, and the oxygen content value is less than 1ppm;

[0017] Step 2: Take the lithium salt, slowly add the lithium salt into the ether solvent described in step 1, and mix evenly to make a mixed solution; the molar concentration of the lithium salt is 0.8-1.5mol / L;

[0018] Step 3: Take lithium nitrate, and slowly add lithium nitrate into the mixed solution described in step 2 to make a semi-finished electrolyte, the mass fraction of lithium nitrate in the semi-finished electrolyte is 0.1% to 3%;

[0019] Step 4: Take the additive for improving cycle perfor...

Embodiment 1

[0022] A benchmark electrolyte that can improve the cycle performance of lithium-sulfur batteries, including ether solvents, lithium salts, lithium nitrate, and additives for improving cycle performance; the ether solvent is a mixture of two solvents, and the first solvent is: 1,3-Dioxane, the second solvent is: ethylene glycol dimethyl ether; the lithium salt is LiTFSi; the additive for improving cycle performance is 3-aminopropyltriethoxysilane.

[0023] A method for preparing a benchmark electrolyte that can improve the cycle performance of lithium-sulfur batteries, comprising the steps of:

[0024] Step 1: Under the condition that the inside of the glove box is in an argon atmosphere, and the water and oxygen content inside does not exceed the standard, take 1,3-dioxane and ethylene glycol dimethyl ether and mix them uniformly to make an ether solvent; The water content value is less than 1ppm, and the oxygen content value is less than 1ppm;

[0025] Step 2: Take LiTFSi, ...

Embodiment 2

[0029] A benchmark electrolyte that can improve the cycle performance of lithium-sulfur batteries, the benchmark electrolyte includes ether solvents, lithium salts, lithium nitrate and additives for improving cycle performance; the ether solvent is a mixture of two solvents, the first The first solvent is: 1,4-dioxane, the second solvent is: diethylene glycol dimethyl ether; the lithium salt is LiFSi; the additive for improving cycle performance is hexamethyldisilane.

[0030] A method for preparing a benchmark electrolyte that can improve the cycle performance of lithium-sulfur batteries, comprising the steps of:

[0031] Step 1: Under the condition that the inside of the glove box is in an argon atmosphere, and the water and oxygen content inside does not exceed the standard, mix 1,4-dioxane and diethylene glycol dimethyl ether evenly to make an ether solvent ; The water content value is less than 1ppm, and the oxygen content value is less than 1ppm;

[0032] Step 2: Take L...

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Abstract

The invention belongs to reference electrolyte capable of improving the cycling performance of a lithium-sulfur battery and a preparation method. The reference electrolyte is prepared from an ether type solvent, lithium salt, lithium nitrate and an additive for improving the cycling performance, wherein the ether type solvent is a mixture of two solvents; a first solvent is any one of 1,3-dioxolane and 1,4-dioxane; a second solvent is any one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether; the lithium salt is any one of LiPF6, LiBF4,LiTFSi, LiFSi and LiBOB; the additive for improving the cycling performance is any one of 3-aminopropyltriethoxysilane, hexamethyldisilane and tetraethyl silicate. The reference electrolyte has the advantages that a preparation process is simple, the prices of the solvents and the additive are cheap, and materials are saved; the reference electrolyte can have a good negative electrode lithium protection effect; after lithium-sulfur battery electrolyte is used in the lithium-sulfur battery, the cycling performance and the safety of the lithium-sulfur battery can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of electrolyte preparation, and in particular relates to a benchmark electrolyte capable of improving the cycle performance of a lithium-sulfur battery and a preparation method. Background technique [0002] In recent years, lithium-ion secondary batteries have become the preferred power source for various digital and electric vehicle products due to their advantages such as high energy density, high working voltage, long cycle life and no pollution. However, with the rapid development of society, the high expectations of digital products, and the large-scale development and application of electric bicycles, electric vehicles, and smart grids, the development of secondary batteries with higher mass-to-energy density and volume-to-volume energy density is the key to satisfying the rapid development of society. The only way to meet the needs of development is also the great technical challenge that researchers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/052
CPCH01M10/052H01M10/0567H01M10/0569H01M2300/0037Y02E60/10
Inventor 王兰吕秀夯
Owner HUARUI XINXIANG CHEM
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