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Flexible positive electrode material of lithium-sulfur battery and preparation method of flexible positive electrode material

A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve difficult and difficult to realize industrialization and other problems, and achieve the effect of improving kinetic behavior, low price, and abundant resources

Active Publication Date: 2021-09-28
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there are many studies on a single influencing factor of lithium-sulfur batteries, but there is almost no solution to solve these three influencing factors at the same time. This is mainly because it is too difficult to solve the three problems at the same time, especially difficult to achieve industrialization

Method used

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  • Flexible positive electrode material of lithium-sulfur battery and preparation method of flexible positive electrode material
  • Flexible positive electrode material of lithium-sulfur battery and preparation method of flexible positive electrode material
  • Flexible positive electrode material of lithium-sulfur battery and preparation method of flexible positive electrode material

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Effect test

Embodiment 1

[0057] The preparation method of the lithium-sulfur battery flexible positive electrode material in this embodiment includes the following steps:

[0058] (1)C 3 N 4 Solution preparation: the C 3 N 4 Grind, sieve 100 mesh, then soak in sulfuric acid, then move to a water bath and heat to 80°C until the solution is clear, and prepare C 3 N 4 0.1wt% solution;

[0059] (2) Preparation of graphene oxide solution: raw material is flake graphite, adopts improved Hummers method, graphite is oxidized, washed to neutral with deionized water, ultrasonically treated for 4h, prepared into a solution of 0.5wt% graphene;

[0060] (3) Preparation of oxidized carbon nanotube solution: raw material is multi-walled carbon nanotube, adopts improved Hummers method, carbon nanotube is oxidized, washes to neutrality with deionized water, is mixed with oxidized carbon nanotube 0.1wt% solution;

[0061] (4) Preparation of ion-loaded few-layer bentonite material: immerse bentonite in deionized ...

Embodiment 2

[0066] The preparation method of the lithium-sulfur battery flexible positive electrode material in this embodiment includes the following steps:

[0067] (1)C 3 N 3 Solution preparation: the C 3 N 3 Grind, sieve 100 mesh, then soak in 5wt% sulfuric acid solution and then move to a water bath at 95°C until the solution is clarified and prepared into C 3 N 3 0.1wt% solution;

[0068] (2) Preparation of graphene oxide solution: raw material is flake graphite, adopts improved Hummers method, graphite is oxidized, washed to neutrality with deionized water, ultrasonically treated for 6h, and prepared into a solution of 1wt% graphene;

[0069] (3) Preparation of oxidized carbon nanotube solution: raw material is multi-walled carbon nanotube, adopts improved Hummers method, carbon nanotube is oxidized, is mixed with the solution of 0.5wt% oxidized carbon nanotube with deionized water to neutrality ;

[0070] (4) Preparation of few-layer attapulgite material: immerse attapulgit...

Embodiment 3

[0075] The preparation method of the lithium-sulfur battery flexible positive electrode material in this embodiment includes the following steps:

[0076] (1)C 2 The preparation of N: the C 2 N is ground, sieved with 300 mesh, then soaked in 5wt% phosphoric acid solution, and then moved to a water bath at 100°C until the solution is clear, and is prepared as C 2 N is a 4wt% solution;

[0077] (2) Preparation of graphene oxide solution: raw material is flake graphite, adopts improved Hummers method, graphite is oxidized, washed to neutrality with deionized water, ultrasonically treated for 12h, and prepared into a solution of 1wt% graphene;

[0078] (3) Preparation of oxidized carbon nanotube solution: raw material is single-walled carbon nanotube, adopts improved Hummers method, carbon nanotube is oxidized, washes to neutrality with deionized water and is mixed with the solution of 0.5wt% oxidized carbon nanotube ;

[0079] (4) Preparation of the few-layer hydrotalcite mat...

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Abstract

The invention discloses a flexible positive electrode material of a lithium-sulfur battery and a preparation method of the flexible positive electrode material, and belongs to the technical field of lithium-sulfur batteries. The preparation method comprises the steps of adding a carbon-nitrogen compound solution and an ion-loaded few-layer clay mineral material solution in the preparation process of the flexible positive electrode material of the lithium-sulfur battery, wherein the mass ratio of the carbon-nitrogen compound solution is 5-60%, the mass ratio of the graphene oxide is 5-25%, the mass ratio of carbon oxide nanotubes is 10-30%, and the balance is the ion-loaded few-layer clay mineral material solution. Detection shows that the first reversible capacity of the prepared flexible positive electrode material reaches 1200-1600 mAh / g, and the capacity retention ratio is greater than 80% after 500 times of circulation.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a flexible cathode material for lithium-sulfur batteries and a preparation method thereof. Background technique [0002] With the development of science and technology, currently the most widely used lithium-ion battery, due to the limitation of theoretical capacity, has gradually been unable to meet the needs of technological development. In order to further increase the capacity of secondary batteries, researchers have turned their research direction to other battery systems with higher energy density, among which the lithium-sulfur battery system has attracted widespread attention. The theoretical capacity of lithium-sulfur batteries is 1167mAh / g, which is nearly three times that of ordinary lithium-ion batteries. It is one of the hot research directions of the next-generation battery system and has great development potential. [0003] The typical discharge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/052
CPCH01M4/38H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor 杨芳赵美娜武聪赵明远夏英凯姜永恒郭懿峰何坤张艺童苏鸿飞董伟
Owner LIAONING TECHNICAL UNIVERSITY
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