Self-supporting lithium-sulfur battery positive electrode sheet, preparation method thereof, and lithium-sulfur battery

A lithium-sulfur battery, self-supporting technology, applied in the field of electrochemical energy storage, can solve the problems of reducing the mass energy density of the battery, the catalyst is difficult to function, and insufficient interface contact, etc., to improve the mass energy density, reduce the activation potential, The effect of weight reduction

Active Publication Date: 2022-07-08
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the insufficient microscopic interfacial contact between the catalyst and the active material makes it difficult for the catalyst to exert its efficacy. How to ensure the effective contact between the active material and the catalyst is the key to improving the effect of the catalyst.
In addition, from the perspective of the energy density of the energy storage system, the mass of the commonly used current collector accounts for more than 60% of the mass of the pole piece, which increases the mass of the battery and reduces the mass energy density of the battery

Method used

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  • Self-supporting lithium-sulfur battery positive electrode sheet, preparation method thereof, and lithium-sulfur battery
  • Self-supporting lithium-sulfur battery positive electrode sheet, preparation method thereof, and lithium-sulfur battery
  • Self-supporting lithium-sulfur battery positive electrode sheet, preparation method thereof, and lithium-sulfur battery

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preparation example Construction

[0038] see figure 1 , an embodiment of the present application provides a method for preparing a positive electrode sheet for a self-supporting lithium-sulfur battery, comprising the following steps:

[0039] Step S1: adding lithium sulfate and transition metal sulfate into the first solvent to obtain a precursor liquid.

[0040] The transition metal sulfate includes at least one of nickel sulfate, cobalt sulfate, iron sulfate, molybdenum sulfate, titanium sulfate, vanadium sulfate, cadmium sulfate, manganese sulfate, copper sulfate, zinc sulfate and ruthenium sulfate. The transition metal sulfates can be converted into transition metal sulfides in subsequent processing, such as nickel sulfate, cobalt sulfate, iron sulfate, molybdenum sulfate, titanium sulfate, vanadium sulfate, cadmium sulfate, manganese sulfate, copper sulfate, zinc sulfate and Ruthenium sulfate can be respectively converted into nickel sulfide, cobalt sulfide, iron sulfide, molybdenum sulfide, titanium sul...

Embodiment 1

[0064] 250 mg of lithium sulfate monohydrate and 50 mg of cobalt sulfate pentahydrate (transition metal sulfate) were dissolved in 5 mL of deionized water to obtain a precursor liquid.

[0065] Weigh 250 mg of dried graphene oxide and place it in 50 mL of deionized water to ultrasonicate for 1 h to obtain a graphene dispersion; 150 mg of polyvinylpyrrolidone (PVP) is dissolved in 10 mL of carbon nanotube slurry with a concentration of 1 mg / mL; the graphite The graphene dispersion is added dropwise to the carbon nanotube slurry, and as the dropwise addition proceeds, the graphene oxide gels to obtain the dispersion.

[0066] The precursor liquid and the dispersion liquid were mixed, and then added dropwise to innumerable ethanol for crystallization at a rate of 1 drop per second, and then stirred for 10 min after the dropwise addition. Then centrifuged at 10000r / min, placed in a polytetrafluoroethylene vessel, and dried at a temperature of 60°C to form a precursor film layer. ...

Embodiment 2

[0069] The difference from Example 1 is that the transition metal sulfate is nickel sulfate.

[0070] Others are the same as in Embodiment 1, and are not repeated here.

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Abstract

A self-supporting lithium-sulfur battery positive electrode sheet, the self-supporting lithium-sulfur battery positive electrode sheet includes a carbon carrier, lithium sulfide and transition metal sulfide, the lithium sulfide and the transition metal sulfide are located on the surface of the carbon carrier and / or the interior of the carbon support; the lithium sulfide is in microstructural contact with the transition metal sulfide. The present application also provides a method for preparing a positive electrode sheet for a self-supporting lithium-sulfur battery, and a lithium-sulfur battery including the positive electrode sheet for a self-supporting lithium-sulfur battery.

Description

technical field [0001] The present application relates to the field of electrochemical energy storage, and in particular, to a self-supporting lithium-sulfur battery positive electrode sheet, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] Due to its high energy density (2600wh kg -1 , 1675mAh g -1 ) and the wide distribution of active substances, low price, non-toxic and green environmental protection and other advantages have attracted widespread attention. [0003] Traditional lithium-sulfur batteries use elemental sulfur as the positive electrode active material, which has a serious "polysulfide shuttle" effect, which will cause rapid battery capacity decay. security risks. In order to improve the safety of the battery, people have begun to study the use of fully intercalated lithium sulfide materials as the positive electrode material of the battery, matching the negative electrode materials such as graphite, silicon, and tin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M4/1397H01M10/052
CPCH01M4/362H01M4/5815H01M4/62H01M4/625H01M4/628H01M4/136H01M4/1397H01M10/052Y02E60/10
Inventor 吕伟李泽健罗冲杨全红康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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