High-performance lithium-sulfur battery composite positive electrode material and preparation method thereof

A technology of lithium-sulfur batteries and composite materials, which is applied in the direction of electrode manufacturing, lithium batteries, battery electrodes, etc., can solve problems such as single structure and function, inability to completely suppress polysulfides, single function of simple graphene diaphragm coating, etc., to achieve expansion Spatial structure, improving cycle stability and unit capacity, improving the effect of conductivity and capacity

Inactive Publication Date: 2021-08-03
CHINA TOWER CO LTD
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Problems solved by technology

[0005] The present invention aims at the practical problem that the structure and function of the carbon material in the positive electrode of the lithium-sulfur battery is single, and the polysulfides cannot be completely suppressed by physical constraints, and proposes a preparation method for the composite positive electrode material of the lithium-sulfur battery. Sodium (SL) is compounded with reduced graphene oxide (rGO), which solves the technical problem of single function of simple graphene diaphragm coating without losing the energy density of the battery. The composite material obtained can be combined with sulfur powder, which can Effectively inhibit the dissolution of polysulfide in the battery and improve the performance of the battery

Method used

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  • High-performance lithium-sulfur battery composite positive electrode material and preparation method thereof
  • High-performance lithium-sulfur battery composite positive electrode material and preparation method thereof
  • High-performance lithium-sulfur battery composite positive electrode material and preparation method thereof

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Embodiment

[0041] Step 1. Put 300mg of graphene oxide in a 60°C oven and bake for 24 hours to remove moisture for later use.

[0042] Step 2. After ultrasonically cleaning 45g of dewatering molecular sieves with alcohol for 5 times, bake them in an oven at 100°C for 24 hours to completely remove the moisture in the molecular sieves;

[0043] Step 3. Put the molecular sieve after dehydration in step 2 into 1000mL of NMP solution, and let it rest for 48 hours to completely remove the moisture in NMP. After 48 hours, use a pipette to absorb the upper liquid, and the NMP solution in the subsequent steps is dehydrated. NMP;

[0044] Step: 4. Slowly add 300mg graphene oxide (GO) in 100mL NMP solution, after stirring for 30 minutes, use ultrasonic dispersion for 60min to completely disperse the graphene to obtain a uniform dispersion;

[0045] Step 5. Add 650 μL of HDI into 100 mL of NMP solution, stir for 5 minutes to mix the two solutions evenly, condense the obtained mixture in an oil bath ...

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Abstract

The invention belongs to the field of new energy, and particularly relates to a lithium-sulfur battery composite positive electrode material and a preparation method thereof. Porous dendritic sodium lignin sulfonate and flaky graphene are combined through chemical bonds, the special physical structures of the porous dendritic sodium lignin sulfonate and the flaky graphene are utilized, the space structure of the conductive additive is further expanded, the contact sites of the conductive additive and the active material sulfur are effectively improved, and the finally prepared rGO(at)SL/S positive electrode material has a loose and porous 3D structure. The contact space between sulfur and the conductive additive is effectively increased, and the conductivity and the capacity of the battery are obviously improved.

Description

technical field [0001] The invention belongs to the field of new energy, and in particular relates to a lithium-sulfur battery composite cathode material and a preparation method thereof. Background technique [0002] Entering 2021, with the introduction of national new infrastructure-related industrial policies, my country's 5G commercialization has entered the fast lane. Due to the characteristics of "high speed, large capacity, low delay and reliability" of 5G communication, compared with the single-station power consumption of 4G base stations of 1100-1300W, the single-station power consumption of 5G base stations has soared to 3500W, which is three times higher than that of 4G. The backup power demand of the base station has increased sharply, and the backup power method of the traditional 4G base station can no longer meet the economic requirements. According to statistics, based on the 5GC-band single-site emergency backup time of 1 hour, the tower company needs to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139H01M4/04H01M10/052
CPCH01M4/0404H01M4/0409H01M4/0471H01M4/13H01M4/139H01M4/62H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 郭正平
Owner CHINA TOWER CO LTD
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