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Cathode lithium protection lithium-sulfur electrolyte and preparation method thereof

An electrolyte and lithium-sulfur technology, which is applied in the lithium-sulfur electrolyte protected by negative electrode lithium and its preparation field, can solve the problems that the capacity of lithium-sulfur batteries does not play a substantial role, the battery cycle performance decreases, and the role of additives is limited. Improved capacity retention and cycle stability, improved battery safety factor, and low cost

Active Publication Date: 2018-01-30
新乡华锐锂电新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the types of additives in lithium-sulfur electrolytes are not as extensively studied as lithium-ion batteries. Traditional lithium-sulfur electrolytes only maintain the transmission of lithium ions, but do not play a substantial role in further improving the capacity of lithium-sulfur batteries.
Moreover, during the cycle process of traditional lithium-sulfur batteries, soluble polysulfides will be produced, and polysulfides will "shuttle" between the positive and negative electrodes, resulting in a continuous decline in battery cycle performance.
Moreover, there are few researches on the negative electrode film-forming additives of lithium-sulfur electrolytes, and the role of additives is limited.

Method used

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  • Cathode lithium protection lithium-sulfur electrolyte and preparation method thereof

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preparation example Construction

[0015] A method for preparing a lithium-sulfur electrolyte protected by negative electrode lithium includes the following steps:

[0016] Step 1: Make the inside of the glove box in an argon atmosphere, and the water and oxygen content inside does not exceed the standard condition, mix the two solvents 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 to the ether solvent described in Step 1, and mix uniformly to form a mixed solution; the mass fraction of the lithium salt in the mixed solution is 10-30%;

[0018] Step 3: Take the transition metal nitrate, and place the transition metal nitrate in a vacuum drying box for drying treatment; the temperature in the vacuum drying box is: 180°C, the drying time is: 24h; high purity is used every 2h Argon replaces the gas in the vacuum drying oven once;

[0019] Step 4: Add the crystalline water-free ...

Embodiment 1

[0022] A lithium-sulfur electrolyte for negative electrode lithium protection, comprising ether solvents, lithium salts and transition metal nitrates. The ether solvents are a mixture of two solvents, and the first solvent is 1,3-dioxolane , The second solvent is ethylene glycol dimethyl ether; the lithium salt is LiTFSi; the transition metal nitrate is La(NO 3 ) 3 ·9H 2 O.

[0023] A method for preparing a lithium-sulfur electrolyte protected by negative electrode lithium includes the following steps:

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

[0025] Step 2: Take LiTFSi, slowly add LiTFSi to the ether solvent described in Step 1, and mix them evenly to form a mi...

Embodiment 2

[0029] A lithium-sulfur electrolyte for protection of negative electrode lithium, comprising ether solvents, lithium salts and transition metal nitrates. The ether solvents are a mixture of two solvents. The first solvent is 1,4-dioxane , The second solvent is diethylene glycol dimethyl ether; the lithium salt is LiFSi; the transition metal nitrate is La(NO 3 ) 3 ·9H 2 O.

[0030] A method for preparing a lithium-sulfur electrolyte protected by negative electrode lithium includes the following steps:

[0031] Step 1: Make the inside of the glove box in an argon atmosphere, and under the condition that the internal water and oxygen content does not exceed the standard, take 1,4-dioxane and diethylene glycol dimethyl ether and mix 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 LiFSi, slowly add LiFSi to the ether solvent described in Step 1, and mix uniformly to make a mixed solution; t...

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Abstract

The invention belongs to a cathode lithium protection lithium-sulfur electrolyte and a preparation method thereof. The cathode lithium protection lithium-sulfur electrolyte is prepared from an ether solvent, a lithium salt and transition metal nitrate; the ether solvent is a mixture of two solvents, a first solvent is arbitrary one of 1,3-dioxolane and 1,4-dioxane, and a second solvent is arbitrary one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether; the lithium salt is arbitrary one of LiPF6, LiBF4, LiTFSi, LiFSi and LiBOB; and the transition metal nitrate is arbitrary one of La(NO3)3.9H2O, Zr(NO3)4.5H2O and Ce(NO3)3.6H2O. The cathode lithium protection lithium-sulfur electrolyte has the advantages that the configuration processis simple, the cost is low, used materials are saved, the effect of protecting cathode lithium can be exerted, the capacity retention rate and the cycle stability of a battery are enabled to be obviously improved, and the safety coefficient of the battery is greatly improved.

Description

Technical field [0001] The invention belongs to the technical field of electrolyte preparation, and specifically relates to a lithium-sulfur electrolyte protected by negative electrode lithium and a preparation method thereof. Background technique [0002] In recent years, people's requirements for energy storage equipment have become higher and higher, and the development of high energy density secondary batteries has received widespread attention. Traditional lithium-ion batteries with lithium hexafluorophosphate as the positive electrode and graphite as the negative electrode are no longer sufficient to meet the explosive demand for energy storage devices due to their low energy density. The theoretical discharge capacity of the lithium-sulfur battery is 1675mAh / g, and the theoretical energy density is 2567Wh / Kg. Compared with the traditional lithium-ion battery, the lithium-sulfur battery has obvious advantages and is expected to replace the conventional lithium-ion battery t...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/0569H01M10/052
CPCY02E60/10
Inventor 王兰吕秀夯
Owner 新乡华锐锂电新能源股份有限公司
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