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Carrier material for positive electrode of lithium-sulfur battery and preparation method thereof

A carrier material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve the problems of low utilization rate of active materials, poor conductivity, etc.

Pending Publication Date: 2020-08-04
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a carrier material for lithium-sulfur battery positive electrode and its preparation method in view of the defects of poor conductivity, low active material utilization rate and shuttle effect of lithium-sulfur battery positive electrode materials in the prior art. The carrier material is Nb-Nb with one-dimensional mesoporous nanoribbon arrays 4 N 5 Composite materials, used in lithium-sulfur battery cathodes can significantly improve the discharge specific capacity, cycle stability, rate performance and cycle life of lithium-sulfur batteries

Method used

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  • Carrier material for positive electrode of lithium-sulfur battery and preparation method thereof
  • Carrier material for positive electrode of lithium-sulfur battery and preparation method thereof

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Embodiment 1

[0024] The carrier material used for the positive electrode of the lithium-sulfur battery is Nb-Nb with a one-dimensional mesoporous nanoribbon array 4 N 5 composite material.

[0025] The preparation method of the carrier material for the positive electrode of lithium-sulfur battery comprises the following steps:

[0026] (1) Preparation of Nb-KNb 3 o 8 Composite material: The niobium metal foil is firstly polished with SiC sandpaper, then ultrasonically cleaned with acetone, ethanol and deionized water for 5 minutes respectively, dried under a flowing nitrogen atmosphere and then soaked in 40mL of KOH solution with a concentration of 0.01mol / L Put it in the reaction kettle and heat it up to 175°C for 15 hours. After the reaction is completed, cool it down to room temperature naturally to get Nb-KNb 3 o 8 composite materials;

[0027] (2) Preparation of Nb-Nb 2 o 5 Composite material: with step (1) gained Nb-KNb 3 o 8 The composite material was placed in HNO with a ...

Embodiment 2

[0033] The preparation method of the carrier material for the positive electrode of lithium-sulfur battery comprises the following steps:

[0034] (1) Preparation of Nb-KNb 3 o 8 Composite material: The niobium metal foil is first polished with SiC sandpaper, then ultrasonically cleaned with acetone, ethanol and deionized water for 2 minutes respectively, dried under a flowing nitrogen atmosphere and then soaked in 20mL of KOH solution with a concentration of 0.001mol / L Put it in the reactor and heat it up to 150°C for 10 hours. After the reaction is completed, cool it down to room temperature naturally to get Nb-KNb 3 o 8 composite materials;

[0035] (2) Preparation of Nb-Nb 2 o 5 Composite material: with step (1) gained Nb-KNb 3 o 8 The composite material was placed in HNO with a concentration of 1mol / L 3 Immerse in the solution for 12 hours for protonation; after the completion of protonation, rinse with deionized water until neutral, dry at room temperature, place...

Embodiment 3

[0040] The preparation method of the carrier material for the positive electrode of lithium-sulfur battery comprises the following steps:

[0041] (1) Preparation of Nb-KNb 3 o 8 Composite material: The niobium metal foil is first polished with SiC sandpaper, then ultrasonically cleaned with acetone, ethanol and deionized water for 10 minutes respectively, dried under a flowing nitrogen atmosphere and then soaked in 60 mL of KOH solution with a concentration of 0.03 mol / L Put it in the reactor and heat it up to 200°C for 20 hours. After the reaction is completed, cool it down to room temperature naturally to get Nb-KNb 3 o 8 composite materials;

[0042] (2) Preparation of Nb-Nb 2 o 5 Composite material: with step (1) gained Nb-KNb 3 o 8 The composite material was placed in HNO with a concentration of 3mol / L 3 Immerse in the solution for 36 hours for protonation; after the completion of protonation, rinse with deionized water until neutral, dry at room temperature, pla...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a carrier material for a positive electrode of a lithium-sulfur battery and a preparation method of the carrier material. The carrier material is an Nb-Nb4N5 composite material with a one-dimensional mesoporous nanobelt array, and the specific discharge capacity, the cycling stability, the rate capability and the cycle life of the lithium-sulfur battery can be remarkably improved when the carrier material is used for the positive electrode of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a carrier material for positive electrodes of lithium-sulfur batteries and a preparation method thereof. Background technique [0002] With the development of society, the performance requirements of the public for portable electronic products are constantly improving. With the rapid development, people have higher and higher requirements for the energy density and power density of lithium-ion batteries. However, limited by the theoretical lithium storage capacity of the battery system and electrode materials, the current lithium-ion battery system with the best comprehensive performance has been difficult to meet the future society's requirements for high specific energy. Therefore, it is an urgent problem to seek a battery energy storage material with higher energy density, lighter weight, smaller volume and longer cycle life. In recent years, lit...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/052
CPCH01M4/624H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 钊妍李超杰
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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