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Nano material applied to positive electrode of lithium-sulfur battery and preparation method of nano material

A technology of nanomaterials and lithium-sulfur batteries, applied in nanotechnology for materials and surface science, battery electrodes, lithium batteries, etc., can solve the problem of poor cycle life of lithium-sulfur batteries, unsatisfactory effects, sulfur volume expansion, etc. problems, to achieve the effect of improving electrochemical performance, inhibiting the shuttle effect, and small particle size

Inactive Publication Date: 2020-12-04
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the development of lithium-sulfur batteries faces the following problems: the conductivity of sulfur is low; polysulfides dissolve in the electrolyte and the volume of sulfur expands during discharge.
These issues lead to poor cycle life, low specific capacity, and low energy efficiency of lithium-sulfur batteries
[0003] In order to overcome the above problems and improve the capacity retention rate of lithium-sulfur batteries, positive electrode materials such as functionalized carbon materials, graphene oxides, and conductive polymers with high surface area and porosity are currently being developed, but the effect has not reached ideal expectations.

Method used

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  • Nano material applied to positive electrode of lithium-sulfur battery and preparation method of nano material
  • Nano material applied to positive electrode of lithium-sulfur battery and preparation method of nano material

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Effect test

Embodiment 1

[0018] The nano-material applied to the positive electrode of the lithium-sulfur battery is aluminum / gallium nitride nano-particles. The particle size of the nanoparticles is less than 10nm.

[0019] The preparation method of the nanomaterial is characterized in that it comprises the following steps:

[0020] (1) Preparation of mesoporous graphitized carbon nitride: first in 1gCH 2 N 2 2.5 g of an aqueous solution of silica nanoparticles with a mass fraction of 40% was added to the mixture, and then heated to 90° C. under vigorous stirring to ensure the slow evaporation of water. After the water is evaporated, a white solid is obtained, which is placed in a closed ceramic crucible and heated to 550°C, and kept for 4 hours; finally, the concentration of 4mol / L NH 4 HF 2 Solution removal of silica nanoparticles yields mesoporous graphitized carbon nitride (mpg-C 3 N 4 );

[0021] (2) Preparation of ternary metal nitride nanoparticles Al-Ga-N: First, 2.0 g of ethanol is us...

Embodiment 2

[0023] The nanomaterial applied to the positive electrode of lithium-sulfur battery is titanium / vanadium nitride nanoparticle. The particle size of the nanoparticles is less than 10nm.

[0024] The preparation method of described nanometer material, comprises the following steps:

[0025] (1) Preparation of mesoporous graphitized carbon nitride: first in 1gCH 2 N 2 2.5 g of an aqueous solution of silica nanoparticles with a mass fraction of 40% was added to the mixture, and then heated to 90° C. under vigorous stirring to ensure the slow evaporation of water. After the water is evaporated, a white solid is obtained, which is placed in a closed ceramic crucible and heated to 550°C, and kept for 4 hours; finally, the concentration of 4mol / L NH 4 HF 2 Solution removal of silica nanoparticles yields mesoporous graphitized carbon nitride (mpg-C 3 N 4 );

[0026] (2) Preparation of ternary metal nitride nanoparticles Ti-V-N: First, 2.0 g of ethanol was used to dissolve the me...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a nano material applied to a positive electrode of a lithium-sulfur battery and a preparation method of the nano material. The nano material is ternary metal nitride nano particles. The nano material is small in particle size, high in conductivity and capable of effectively adsorbing lithium polysulfide and inhibiting the shuttle effect of lithium polysulfide. The method adopted in the preparation of the ternary metal nitride nano material is simple and convenient, the particle size and components of the prepared material are controllable, and the method has universality.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a nanometer material applied to the positive electrode of lithium-sulfur batteries and a preparation method thereof. Background technique [0002] The development of portable electronic devices and electric vehicles requires high-efficiency electrical energy storage systems, and lithium-sulfur batteries are -1 The high energy density has become the most promising energy storage system. Sulfur is a promising cathode material with a theoretical specific capacity of 1672mAh g -1 , In addition, sulfur has the advantages of environmental friendliness and low cost. However, the development of lithium-sulfur batteries faces the following problems: the conductivity of sulfur is low; polysulfides dissolve in the electrolyte and the volume of sulfur expands during discharge. These issues lead to poor cycle life, low specific capacity, and low energy efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/00H01M4/62H01M10/052B82Y30/00
CPCC01B21/00H01M4/624H01M4/628H01M10/052B82Y30/00C01P2004/64C01P2006/40Y02E60/10
Inventor 张永光筵亚静
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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