Method for protecting anode of lithium sulfur battery

A technology of lithium-sulfur battery and sulfur battery, which is applied in the field of electrochemistry, achieves the effect of strong practicability, easy industrialization, and realization of industrialization

Inactive Publication Date: 2015-12-09
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of the existing lithium-sulfur battery, and provide a method for protecting the lithium negative electrode by coating a protective layer on the separator in the lithium-sulfur battery and attaching it to the lithium negative electrode

Method used

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  • Method for protecting anode of lithium sulfur battery
  • Method for protecting anode of lithium sulfur battery
  • Method for protecting anode of lithium sulfur battery

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Weigh 0.32g activated carbon and 0.04gLiNO 3 , mix it in a mortar and grind it evenly, then pour it into a reaction bottle containing 0.04g of adhesive LA132 dispersed with 10g of dispersant, and stir at room temperature for 12h. After the slurry is evenly stirred, use a film applicator with a suitable thickness to coat evenly on one side of the diaphragm. Generally, after the coated diaphragm is naturally dried, it is placed in a vacuum oven at 60°C for 12 hours, and the baked diaphragm is cut. Form a disc with a diameter of Φ19mm, weigh and number it to prepare a separator with a functional protective coating, and then assemble a lithium-sulfur battery to test the relevant electrochemical performance. The lithium-sulfur battery is a CR2025 type button battery, and its positive electrode is a carbon / sulfur compound (90% sulfur content, LA132 is used as a binder), with metal lithium as the negative electrode, and the diaphragm is the functional protective coating prepar...

Embodiment 2

[0022] Weigh 0.24g BP2000 and 0.12g AlI3, mix them in a mortar and grind them evenly, then pour them into a reaction bottle containing 0.04g binder PVDF dispersed with 8g dispersant, and stir at room temperature for 12h. After the slurry is evenly stirred, use a film applicator with a suitable thickness to coat evenly on one side of the diaphragm. Generally, after the coated diaphragm is naturally dried, it is placed in a vacuum oven at 60°C for 12 hours, and the baked diaphragm is cut. Form a disc with a diameter of Φ19mm, weigh and number it to prepare a separator with a functional protective coating, and then assemble a lithium-sulfur battery to test the relevant electrochemical performance. 100mAg at room temperature -1 The charge and discharge test is carried out under the current density, and the first discharge specific capacity is 1090.4mAhg -1 , 50 discharge capacity 804.6mAhg -1 , 50 times the capacity retention rate was 73.8%, and the average Coulombic efficiency ...

Embodiment 3

[0024] Weigh 0.28gAl2 o 3 and 0.08gLiNO 3 , mix it in a mortar and grind it evenly, then pour it into a reaction bottle containing 0.04g binder PTFE dispersed with 5g dispersant, and stir at room temperature for 12h. After the slurry is evenly stirred, use a film applicator with a suitable thickness to coat evenly on one side of the diaphragm. Generally, after the coated diaphragm is naturally dried, it is placed in a vacuum oven at 60°C for 12 hours, and the baked diaphragm is cut. Form a disc with a diameter of Φ19mm, weigh and number it to prepare a separator with a functional protective coating, and then assemble a lithium-sulfur battery to test the relevant electrochemical performance. 100mAg at room temperature -1 The charge and discharge test is carried out under the current density, and the specific capacity of the first discharge is 1052.8mAhg -1 , 50 discharge capacity 810.6mAhg -1 , The 50-time capacity retention rate is 77.0%, and the first-time average Coulomb...

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Abstract

The invention relates to a method for protecting anode of a lithium sulfur battery. A diaphragm functional protective coating can be used for effectively suppressing the generation of lithium dendrites on the surface of a lithium anode, improving the safety of the battery and prolonging the cycle life of the battery, and slurry mixing is carried out by controlling the types and the proportion of a carrier, an adhesive, an additive and the like of the coating to prepare a diaphragm with the functional protective coating for protecting the lithium anode. The operation process is simple, and the protective layer can be used for effectively suppressing the generation of the lithium dendrites; and meanwhile, the additive is continuously released from the carrier, a layer of the protective diaphragm is continuously formed on the surface of the lithium anode to protect the lithium anode, and the safety and the cycling performance of the lithium sulfur battery are further improved.

Description

technical field [0001] The invention relates to a protection method for a negative electrode of a lithium-sulfur battery, belonging to the field of electrochemistry. Background technique [0002] Lithium-sulfur battery has high specific capacity (1675mAh / g) and high specific energy (2600Wh / kg) due to its active material elemental sulfur, and has the advantages of rich elemental sulfur resources, low cost, environmental friendliness, safety and reliability, and has extensive research and development. App background. Lithium anode, as a vital component of lithium-sulfur batteries, greatly affects the electrochemical performance of batteries. Lithium is the lightest metal in nature, with the lowest electronegativity, the relative standard hydrogen electrode potential is -3.045V, and the specific capacity is 3860mAh / g. In theory, batteries with metal lithium as the negative electrode can become batteries with higher energy density. However, lithium dendrites are easily generat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403
CPCH01M10/052H01M50/446H01M50/403Y02E60/10
Inventor 刘帅王维坤王安邦苑克国金朝庆余仲宝邱景义李萌张松通杨裕生
Owner NO 63971 TROOPS PLA
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