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Preparation method and application of positive electrode polysulfide buffer layer for improving cycle performance of lithium-sulfur battery

A lithium-sulfur battery, cycle performance technology, applied in the direction of non-aqueous electrolyte battery electrodes, battery components, circuits, etc., can solve the problems of active material loss, dead sulfur, etc., to inhibit aggregation, improve utilization rate, and promote reversible conversion Effect

Pending Publication Date: 2022-04-01
HUAIBEI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the discharge process of lithium-sulfur batteries, a large number of polysulfides are generated, dissolved and gradually detached from the electrode surface. Although the separator coating can alleviate the diffusion of polysulfides to the negative electrode, the discharge products accumulate in large quantities on the surface of the separator coating; when the battery is charged, These aggregates are difficult to convert normally due to the natural "barrier" between the separator coating and the positive electrode, and eventually form "dead sulfur", resulting in the loss of active materials

Method used

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  • Preparation method and application of positive electrode polysulfide buffer layer for improving cycle performance of lithium-sulfur battery
  • Preparation method and application of positive electrode polysulfide buffer layer for improving cycle performance of lithium-sulfur battery
  • Preparation method and application of positive electrode polysulfide buffer layer for improving cycle performance of lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A MoSe 2 The preparation method of @rGO composite material includes the following steps:

[0031] Preparation of GO:

[0032] 1) First take 1g of graphite powder and put it in a clean beaker, then pour 25mL of concentrated sulfuric acid into the beaker, and stir for 1 hour in a zero-degree environment until the powder and liquid are evenly stirred.

[0033] 2) Slowly add 3.5 g of potassium permanganate to the above mixture solution, and then let it stand at 0° C. for 1 hour.

[0034] 3) Put the beaker at room temperature for ten minutes and then move it to a 35°C oil bath for 24 hours.

[0035] 4) After the reaction, slowly add 100 mL of deionized water into the beaker, and then put the beaker in an oil bath at 90°C for 10 minutes.

[0036] 5) Take out the beaker in 4) and cool it down to about 60°C, then transfer the liquid in it to a large 200mL beaker.

[0037] 6) Add H to the large beaker 2 o 2 The excess potassium permanganate was removed from the solution (3...

Embodiment 2

[0045] A method for preparing a positive electrode polysulfide buffer layer that improves the cycle performance of lithium-sulfur batteries, using the MoSe provided in Example 1 2 @rGO composite material, including the following steps:

[0046] Weigh 20mg MoSe 2 The @rGO composite was placed in an agate mortar, PVDF was added dropwise, (MoSe 2 The mass ratio of @rGO to PVDF is 9:1), then add NMP (two or three drops) dropwise and grind it thoroughly with a mortar to make it evenly mixed to obtain a black slurry;

[0047] Coat the prepared black slurry on the substrate (aluminum foil) coated with the positive electrode material again with a coating machine, and then place it in a vacuum oven at 60°C for 6 hours to dry to obtain an improved lithium-sulfur battery on the positive electrode material. Positive polysulfide buffer layer for cycle performance.

Embodiment 3

[0049] A method for preparing an electrode sheet, comprising the following steps:

[0050] Choose aluminum foil;

[0051] Preparation of cathode material on aluminum foil:

[0052] 1) Put the sublimated sulfur and acetylene black in a drying oven to dry first, then weigh them into an agate mortar according to the mass ratio of 3:1, add alcohol and grind vigorously until the alcohol is completely evaporated, then add alcohol to grind, repeat four times About half an hour in a vacuum drying oven;

[0053] 2) Mix the dried material and PVDF in a mass ratio of 9:1, add NMP and stir until the slurry is silky, the mass ratio of dried material to NMP is 1:1, and use an automatic coating machine to coat the The adjusted black slurry is coated on aluminum foil and dried in a vacuum oven at 60°C for 24 hours;

[0054] Prepare the positive electrode polysulfide buffer layer provided by Example 2 on the positive electrode material:

[0055] 3) Weigh 20mg MoSe 2 The @rGO composite was p...

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Abstract

The invention discloses a preparation method and application of a positive electrode polysulfide buffer layer for improving the cycle performance of a lithium-sulfur battery, and relates to the technical field of electrode material treatment. The preparation method comprises the following steps: uniformly dispersing graphene oxide in an octylamine solution, transferring into a reaction kettle, adding MoO3 and SeO2, uniformly mixing, and reacting at 180-200 DEG C for 12-36 hours to obtain a precursor; cleaning and drying the precursor, and annealing and reducing the precursor in a mixed atmosphere of hydrogen and inert gas at 380-450 DEG C for 1.5-3 hours to obtain a MoSe2 (at) rGO composite material; and placing the MoSe2 (at) rGO composite material in a grinding body, adding PVDF and NMP, grinding until the materials are uniformly mixed to obtain black slurry, then coating a pretreated aluminum foil with the black slurry, and carrying out vacuum drying to obtain the positive electrode polysulfide buffer layer. The polysulfide buffer layer material provided by the invention can reduce the interface impedance between the coating and the positive electrode and promote the reversible conversion of a discharge product to active sulfur, so that the utilization rate of the active sulfur and the overall performance of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a preparation method and application of a positive polysulfur buffer layer for improving the cycle performance of lithium-sulfur batteries. Background technique [0002] Lithium-sulfur batteries are the most potential high-energy-density energy storage systems in the post-lithium-ion battery era, but the active sulfur in the positive electrode of lithium-sulfur batteries has low conductivity, and the polysulfides generated during charging and discharging are easily dissolved in the electrolyte and form a shuttle effect. This severely limits the commercial development of lithium-sulfur batteries. In order to solve these problems, researchers have carried out a lot of research work on the positive electrode, diaphragm, diaphragm coating, electrolyte and negative electrode of lithium-sulfur batteries, improving the overall performance of the battery. For example, the Na...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M50/431H01M50/46
Inventor 尤玉喻翰治崔灿包书红张富家张永兴
Owner HUAIBEI NORMAL UNIVERSITY
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