Preparation method of diaphragm with electro-catalysis function and application of diaphragm in lithium-sulfur battery

A lithium-sulfur battery and electrocatalysis technology, which is applied to the diaphragm with electrocatalytic function and the application field of lithium-sulfur batteries, to achieve the effects of improving cycle stability and rate performance, prolonging cycle life, and alleviating volume expansion

Inactive Publication Date: 2020-07-10
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the current strategy based on adsorption or "containment" of lithium polysul

Method used

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  • Preparation method of diaphragm with electro-catalysis function and application of diaphragm in lithium-sulfur battery
  • Preparation method of diaphragm with electro-catalysis function and application of diaphragm in lithium-sulfur battery
  • Preparation method of diaphragm with electro-catalysis function and application of diaphragm in lithium-sulfur battery

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Experimental program
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Effect test

Embodiment 1

[0038] (1) Preparation of sulfur / carbon composite positive electrode with high sulfur loading: Weigh 2.0 g of sublimed sulfur and 0.5 g of Ketjen black in a mortar. After the sublimated sulfur and Ketjen black are fully ground and mixed, the obtained sulfur / carbon The carbon mixture was transferred to a glass tube. After vacuuming, the glass tube was sealed and heat-treated in a muffle furnace at 300°C for 10 hours to obtain a sulfur / carbon composite material. The obtained product was named S / C. Mix the above-prepared S / C composite material with conductive carbon black SuperP and binder LA133 in a vial according to the mass ratio of 9:0.5:0.5, deionized water and absolute ethanol as dispersants, and magnetically stir to make the slurry Mix evenly, and then apply the coating slurry on the surface of the pre-cut aluminum foil to make a sulfur electrode sheet by the doctor blade coating method, and dry it in a vacuum oven at 60°C for 24 hours before use.

[0039] (2) O-doped MoS ...

Embodiment 2

[0043] (1) P-doped MoS 2 The preparation of / graphene composite material: get the graphene aqueous solution that (2) step prepares in embodiment 1. Weigh 155mg (NH 4 ) 6 Mo 7 o 24 4H 2 O, 285mg thiourea and 52mg NaH 2 PO 2 Add to 70mL graphene aqueous solution whose concentration is 1-3g / L, and keep stirring. The resulting mixed solution was transferred to an autoclave, and subjected to a hydrothermal reaction at a temperature of 200°C for 18 h, cooled to room temperature naturally, washed with deionized water and filtered with suction, and the obtained solid precipitate was vacuum-dried for 24 h to obtain P-doped MoS 2 / graphene composites.

[0044] (2) P-doped MoS 2 / Preparation of graphene@PP composite separator: take dry P-doped MoS 2 / Graphene composite material is ground into powder, and then mixed with conductive carbon black SuperP and binder PVDF according to the mass ratio of 9:0.5:0.5, N-methylpyrrolidone (NMP) solution is used as a dispersant, and high-s...

Embodiment 3

[0047] (1) Co-doped MoS 2 The preparation of / graphene composite material: get the graphene aqueous solution that (2) step prepares in embodiment 1. Weigh 155mg (NH 4 ) 6 Mo 7 o 24 4H 2 O, 285mg thiourea and 130mg Co(NO 3 ) 2 Add to 70mL graphene aqueous solution whose concentration is 1-3g / L, and keep stirring. The resulting mixed solution was transferred to an autoclave, and subjected to a hydrothermal reaction at a temperature of 200 °C for 18 h, cooled to room temperature naturally, washed with deionized water and filtered with suction, and the obtained solid precipitate was vacuum-dried for 24 h to obtain Co-doped MoS 2 / graphene composites.

[0048] (2) Co-doped MoS 2 / Preparation of graphene@PP composite separator: taking dry Co-doped MoS 2 / Graphene composite material is ground into powder, and then mixed with conductive carbon black SuperP and binder PVDF according to the mass ratio of 9:0.5:0.5, N-methylpyrrolidone (NMP) solution is used as a dispersant, a...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and relates to a diaphragm with an electro-catalysis function and a preparation method and application thereof. The diaphragmis composed of a commercial polymer diaphragm matrix and an electrocatalytic function modification layer coating the surface of one side of the diaphragm matrix, the electrocatalytic function modification layer comprises a binder, a conductive agent and an electrocatalyst; the electrocatalyst is a three-dimensional porous compound composed of graphene and heteroatom doped MoS2. The three-dimensional porous structure constructed by the graphene can adsorb a large amount of lithium polysulfide dissolved in the electrolyte through physical action; the heteroatom-doped MoS2 has rich interface defects, polarity and electrocatalytic activity, can efficiently and chemically adsorb lithium polysulfide and catalyze electrochemical conversion of the lithium polysulfide, inhibits the shuttle effect of the lithium-sulfur battery, and improves the reversible capacity and the cycling stability of the high-sulfur-loading lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage batteries, and in particular relates to a diaphragm with electrocatalytic function, its preparation method and its application in lithium-sulfur batteries. Background technique [0002] Lithium-sulfur batteries are one of the lithium secondary battery systems that have received high hopes from the scientific and industrial circles. The lithium-sulfur secondary battery uses metal lithium as the negative electrode and elemental sulfur as the positive electrode, and its theoretical specific capacity is 1675mAhg -1 The theoretical energy density is 2600Whkg -1 , the actual energy density can be as high as 400Whkg -1 , and high specific energy and high specific work at the same time low cost and environmentally friendly. However, lithium-sulfur secondary batteries have defects such as low utilization of sulfur active materials, poor electrochemical reversibility, and fast capacity decay...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M10/42
CPCH01M10/052H01M10/4235H01M50/403H01M50/411Y02E60/10
Inventor 孙福根李亚辉丁国彧景鑫国严奉乾朱振高远徐国军李晓敏岳之浩周浪
Owner NANCHANG UNIV
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