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A kind of lithium-sulfur battery positive electrode material, preparation method and application

A technology of sulfur solution and sulfur powder, which is applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of sulfur positive electrode structure damage, poor cycle performance, and battery capacity attenuation, so as to improve utilization rate and conductivity Improve and inhibit the effect of dissolution

Active Publication Date: 2022-02-22
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

Another part of short-chain polysulfide ions is further reduced to insoluble Li on the negative electrode lithium 2 S 2 / Li 2 S, causing corrosion to the lithium anode
During the repeated shuttle process, the active substance sulfur is continuously lost, the capacity of the battery is continuously attenuated, and the cycle performance is deteriorated; 3) elemental sulfur (2.03g cm -3 ) and Li 2 S (1.67g·cm -3 ) has a large difference in density, and there will be obvious volume expansion during the cycle, resulting in the destruction of the structure of the sulfur cathode

Method used

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  • A kind of lithium-sulfur battery positive electrode material, preparation method and application
  • A kind of lithium-sulfur battery positive electrode material, preparation method and application
  • A kind of lithium-sulfur battery positive electrode material, preparation method and application

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Embodiment 1

[0042] A kind of preparation method of lithium-sulfur battery cathode material, a kind of Au / Ni 12 P 5 The preparation method of @S core-shell nanoparticles, the specific steps are as follows,

[0043] The first step, the preparation of Au-Ni heterodimer nanoparticles:

[0044] 0.5 g of nickel diacetylacetonate was dissolved in 10 mL of oleylamine, and then heated at 100° C. for 15 min to form solution A. Subsequently, 0.05g of chloroauric acid was dissolved in 5mL of toluene solution to prepare solution B, and the prepared solution B was added dropwise to solution A in stirring, while maintaining the temperature at 100°C and heating for 60min to obtain solution C, and then solution C heating to 230° C. and maintaining for 60 min to form Au-Ni heterodimer nanoparticles to obtain a solution D containing Au-Ni heterodimer nanoparticles;

[0045] The second step, Au / Ni 12 P 5 Preparation of core-shell nanoparticles:

[0046] Add 1 g of triphenyl phosphate to the solution D ...

Embodiment 2

[0054] A kind of preparation method of lithium-sulfur battery cathode material, a kind of Au / Ni 12 P 5 The preparation method of @S core-shell nanoparticles, the specific steps are as follows,

[0055] The first step, the preparation of Au-Ni heterodimer nanoparticles:

[0056] 1 g of nickel diacetylacetonate was dissolved in 10 mL of oleylamine, and then heated at 150° C. for 30 min to form solution A. Subsequently, 0.1 g of chloroauric acid was dissolved in 15 mL of toluene solution to prepare solution B, and the prepared solution B was added dropwise to solution A in stirring, while maintaining the temperature at 150 ° C and heating for 90 min to obtain solution C, and then the solution was heated to 200° C. and keep for 90 min to form Au-Ni heterodimer nanoparticles to obtain a solution D containing Au-Ni heterodimer nanoparticles;

[0057] The second step, Au / Ni 12 P 5 Preparation of core-shell nanoparticles:

[0058] Add 2 g of triphenyl phosphate into the solution...

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Abstract

The invention relates to the technical field of electrodes composed of active materials, in particular to a lithium-sulfur battery cathode material, a preparation method and an application. It is a kind of Au / Ni with core-shell structure prepared by simple phosphating process 12 P 5 The @S nanoparticle method is a preparation method for lithium-sulfur battery cathode materials with the characteristics of high yield and industrial feasibility. Semiconductor Ni modified by noble metal Au 12 P 5 It can ensure its high conductivity to improve the transmission rate of electrons and ions; the core-shell structure not only coats sulfur but also enhances the capture of soluble polysulfides, and can also effectively adapt to the volume change generated during charge and discharge.

Description

technical field [0001] The invention relates to the technical field of electrodes composed of active materials, in particular to a lithium-sulfur battery cathode material, a preparation method and an application. Background technique [0002] With the continuous development of science and technology, the demand for energy in human society is increasing, and high-capacity batteries have increasingly become the focus of attention. Although the energy density of lithium-ion batteries has reached 150-200Wh / kg, the traditional LiCoO 2 , LiFeO 4 , LiNiO 2 The theoretical capacity of the battery is limited, and it is difficult to further increase its battery capacity. Lithium-sulfur (Li-S) batteries have high theoretical specific capacity (1675mAh / g) and high theoretical specific energy (2600Wh / kg); and sulfur reserves are abundant, cheap, and will not pollute the environment. Therefore, the development of Li-S batteries is of great significance to reduce the use of fossil fuels...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCH01M4/366H01M4/38H01M4/62H01M4/624H01M4/628H01M10/052B82Y30/00B82Y40/00Y02E60/10
Inventor 张永光崔国梁
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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