Self-supporting lithium-sulfur battery positive plate, 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 the interface contact is insufficient, so as to improve the mass energy density, reduce the activation potential, weight reduction effect

Active Publication Date: 2020-07-10
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 plate, preparation method thereof and lithium-sulfur battery
  • Self-supporting lithium-sulfur battery positive plate, preparation method thereof and lithium-sulfur battery
  • Self-supporting lithium-sulfur battery positive plate, preparation method thereof and lithium-sulfur battery

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preparation example Construction

[0038] see figure 1 , the embodiment of the present application provides a method for preparing a positive electrode sheet of 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. Described transition metal sulfate can be converted into transition metal sulfide in subsequent treatment process, for example 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 converted into nickel sulfide, cobalt sulfide, iron sulfide, molybdenum sulfide, titanium s...

Embodiment 1

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

[0065] Weigh 250 mg of dry graphene oxide and place it in 50 mL of deionized water for ultrasonication 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 olefin dispersion liquid is added dropwise to the carbon nanotube slurry, and the graphene oxide gels as the dropwise addition proceeds to obtain the dispersion liquid.

[0066] The precursor liquid and the dispersion liquid were mixed, and then added dropwise to countless ethanol for crystallization, the dropping speed was 1 drop per second, and then stirred for 10 min after the dropping was completed. Then it was centrifuged at a speed of 10000r / min, placed in a polytetrafluoroethylene vessel, and dried at a temperature of ...

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 will not be repeated here.

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Abstract

The self-supporting lithium-sulfur battery positive plate comprises a carbon carrier, lithium sulfide and transition metal sulfide, and the lithium sulfide and the transition metal sulfide are locatedon the surface of the carbon carrier and/or in the carbon carrier; and the lithium sulfide is in contact with the transition metal sulfide in microstructure. The invention also provides a preparationmethod of the self-supporting lithium-sulfur battery positive plate, and a lithium-sulfur battery comprising the self-supporting lithium-sulfur battery positive plate.

Description

technical field [0001] The present application relates to the field of electrochemical energy storage, 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 active substances are widely distributed, low in price, non-toxic and environmentally friendly, and have received 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 decline in battery capacity. security risks. In order to improve the safety of batteries, people began to study the use of lithium sulfide materials in a fully intercalated lithium state as battery anode materials, matching graphite, silicon, tin and other anode materials, to prepare safer and high-performance lithium-sulf...

Claims

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Application Information

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Patent Type & Authority Applications(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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