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Lithium-sulfur battery electrolyte and preparation method thereof

A lithium-sulfur battery and electrolyte technology, applied in the field of preparation of the electrolyte, can solve the problem that the improvement effect of battery specific capacity and cycle performance is not obvious, the improvement of cycle performance and specific capacity cannot be taken into account, it is difficult to industrialize production and Application and other issues, to achieve the effect of improving discharge specific capacity and cycle stability, improving discharge specific capacity and capacity retention rate, and facilitating industrial production

Active Publication Date: 2019-05-21
深圳启辰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the material is relatively complicated, the cost is high, and it is difficult to realize industrial production and application.
The research on the electrolyte has also achieved good results. The coulombic efficiency and cycle performance of the battery are improved by adding various additives. Many additives cannot improve the cycle performance and specific capacity while improving the coulombic efficiency.
At present, the additives of lithium-sulfur batteries are mainly LiNO 3 and P 2 S 5 , which has a significant effect on improving the Coulombic efficiency of the battery, but has no obvious effect on improving the specific capacity and cycle performance of the battery

Method used

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  • Lithium-sulfur battery electrolyte and preparation method thereof
  • Lithium-sulfur battery electrolyte and preparation method thereof
  • Lithium-sulfur battery electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The specific preparation method of embodiment 1 is as follows:

[0023] Step 1: In a glove box filled with argon gas, mix DOL and DME at a volume ratio of 1:1 to prepare a 100ml basic solution for lithium-sulfur batteries. The water content in the glove box is less than 0.1ppm , the oxygen content value is less than 0.1ppm;

[0024] Step 2: Mix 28.71 g of LiTFSI and 0.69 g of LiNO 3 After drying in a vacuum drying oven, slowly add it to 100ml of the basic solution, mix evenly to obtain the basic electrolyte of the lithium-sulfur battery, the vacuum degree in the drying oven is 10000Pa, the drying temperature is 120 degrees, and the drying time is 18 Hour;

[0025] Step 3: Add 0.24 g of C 8 h 18 Te 2 Slowly add to the basic electrolyte of lithium-sulfur batteries, and mix well to obtain the required lithium-sulfur battery electrolyte.

[0026] Step 4: Preparation of lithium-sulfur battery: Mix carbon-sulfur composite material, carbon black and polyvinylidene fluori...

Embodiment 2-7

[0028] Except the parameters in the following table, other parameters and preparation method are the same as in Example 1.

[0029] Table 1 Embodiment 2-7 and Comparative Example 1

[0030]

[0031]

[0032] The test result under the 0.5C rate condition of table 2 embodiment and comparative example

[0033]

[0034]

[0035]From the results of Examples 1 to 7 and Comparative Example 1, it can be seen that in Comparative Example 1, at a discharge rate of 0.5C, the first cycle discharge specific capacity is 805mAh / g, which is less than the first cycle discharge specific capacity of Examples 1 to 7. 127mAh / g~208mAh / g. In terms of cycle performance, the capacity retention rate of Comparative Example 1 after 300 cycles is 31.6%, which is 49.0%-55.6% lower than that of Examples 1 to 7. It can be seen that the tellurium organic additives in the lithium-sulfur battery electrolyte can significantly improve the discharge specific capacity and cycle performance of the lithi...

Embodiment 8

[0037] The specific preparation method of embodiment 8 is as follows:

[0038] Step 1: In a glove box filled with argon gas, mix DOL, DME and DMDS according to the volume ratio of 1:1:1 to prepare 100ml of lithium-sulfur battery basic solution. The water content in the glove box is is less than 1ppm, the oxygen content value is less than 1ppm;

[0039] Step 2: Add 46.8 g of LiSO 3 CF 3 and 0.69 g of LiNO 3 After drying in a vacuum drying oven, slowly add it to 100ml of the basic solution, and mix well to obtain the basic electrolyte for lithium-sulfur batteries. The vacuum degree in the drying oven is 5000Pa, the drying temperature is 150 degrees, and the drying time is 12 hours. ;

[0040] Step 3: Add 4.8 grams of C 8 h 18 Te 2 Slowly add to the basic electrolyte of lithium-sulfur batteries, and mix well to obtain the required lithium-sulfur battery electrolyte.

[0041] Step 4: Preparation of lithium-sulfur battery: Mix carbon-sulfur composite material, carbon black ...

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Abstract

A lithium-sulfur battery electrolyte comprises lithium salt, organic solvents and a tellurium organic additive, wherein the molarity of the lithium salt ranges from 0.1mol / L to 3mol / L, the molarity ofthe tellurium organic additive ranges from 0.01mol / L to 0.2mol / L, and the remaining part is the organic solvents. A preparation method of the electrolyte comprises the steps that 1, the required organic solvents are mixed according to proportion in a glove box inflated with argon gas, a basic solution is obtained after uniform mixing, and the content value of water and the content value of oxygenin the glove box are both smaller than 1ppm; 2, the lithium salt dried in a vacuum drying oven is added into the basic solution according to a required ratio for mixing, and a basic electrolyte of alithium-sulfur battery is obtained after uniform mixing, wherein the molarity of the lithium salt ranges from 0.1mol / L to 3mol / L; and 3, the tellurium organic additive is added into the basic electrolyte for mixing, and the lithium-sulfur battery electrolyte is obtained after uniform mixing, wherein the molarity of the tellurium organic additive ranges from 0.01mol / L to 0.2mol / L.

Description

technical field [0001] The invention relates to a lithium-sulfur battery electrolyte that can improve the specific capacity and cycle performance of the battery. The invention also relates to a method for preparing the electrolyte. Background technique [0002] Elemental thioneine has the advantages of high theoretical specific capacity (1675mAh / g) and high theoretical specific energy (2600Wh / kg), abundant reserves, low price, and environmental friendliness, and will become the next generation of high specific energy (monomer specific energy) One of the most promising electrode materials in battery systems with energy ≥300wh / kg. Especially in technical fields such as unmanned aerial vehicles and electric vehicles that require higher battery energy density (single specific energy ≥ 400wh / kg), lithium-sulfur batteries will be extremely competitive in the market. However, the conductivity of elemental sulfur itself is poor (at a normal temperature of 25 degrees Celsius, the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/052
CPCY02E60/10
Inventor 徐辉陈国华
Owner 深圳启辰新能源科技有限公司
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