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Electrode material based on chemical nickel-plating core-shell structure, preparation method of electrode material and lithium-sulfur battery

A core-shell structure and electrode material technology, applied in lithium batteries, non-aqueous electrolyte batteries, positive electrodes, etc., can solve the problems of low sulfur areal density of lithium-sulfur batteries, difficulty in meeting the requirements of power batteries, etc., and improve the electrochemical reaction rate , high areal capacity and energy density, and the effect of improving cycle performance

Pending Publication Date: 2022-04-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this prior art, it is difficult for elemental sulfur to fill the micro-nanopores of porous materials, resulting in a low sulfur areal density of the prepared lithium-sulfur battery, which is difficult to meet the requirements of power batteries for high-load active materials.

Method used

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  • Electrode material based on chemical nickel-plating core-shell structure, preparation method of electrode material and lithium-sulfur battery
  • Electrode material based on chemical nickel-plating core-shell structure, preparation method of electrode material and lithium-sulfur battery
  • Electrode material based on chemical nickel-plating core-shell structure, preparation method of electrode material and lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method of the electrode material based on electroless nickel plating core-shell structure comprises the following steps:

[0042] (1) Sulfur powder was dispersed in deionized water, followed by ultrasonic dispersion for 1 h, so that the sulfur particles were fine and monodisperse.

[0043] (2) Using a certain concentration of sensitizing solution to sensitize the surface of the ultrasonically dispersed sulfur particles. After sensitization, it was washed with deionized water until neutral, and dried in vacuum. The configuration process of the sensitization solution is to first dissolve a certain mass of stannous chloride into concentrated hydrochloric acid, and then add an appropriate amount of deionized water for dilution. The concentration of stannous chloride is 5g / L, and the concentration of concentrated hydrochloric acid is 5mL / L. The sensitization time is 30min.

[0044] (3) Activate the surface of the sensitized sulfur particles with a certain ...

Embodiment 2

[0050] The preparation method of the electrode material based on electroless nickel plating core-shell structure comprises the following steps:

[0051] (1) Sulfur powder was dispersed in deionized water, followed by ultrasonic dispersion for 1 h, so that the sulfur particles were fine and monodisperse.

[0052] (2) Using a certain concentration of sensitizing solution to sensitize the surface of the ultrasonically dispersed sulfur particles. After sensitization, it was washed with deionized water until neutral, and dried in vacuum. The configuration process of the sensitization solution is to first dissolve a certain mass of stannous chloride into concentrated hydrochloric acid, and then add an appropriate amount of deionized water for dilution. The concentration of stannous chloride is 10g / L, and the concentration of concentrated hydrochloric acid is 10mL / L. The sensitization time is 20min.

[0053] (3) Activate the surface of the sensitized sulfur particles with a certai...

Embodiment 3

[0058] The preparation method of the electrode material based on electroless nickel plating core-shell structure comprises the following steps:

[0059] (1) Sulfur powder was dispersed in deionized water, followed by ultrasonic dispersion for 1 h, so that the sulfur particles were fine and monodisperse.

[0060] The surface of ultrasonically dispersed sulfur particles is sensitized by a certain concentration of sensitizing solution. After sensitization, it was washed with deionized water until neutral, and dried in vacuum. The configuration process of the sensitization solution is to first dissolve a certain mass of stannous chloride into concentrated hydrochloric acid, and then add an appropriate amount of deionized water for dilution. The concentration of stannous chloride is 20g / L, and the concentration of concentrated hydrochloric acid is 20mL / L. The sensitization time is 10min.

[0061] (4) Activate the surface of the sensitized sulfur particles with a certain concentr...

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Abstract

The invention relates to an electrode material based on a chemical nickel-plating core-shell structure, a preparation method of the electrode material and a lithium-sulfur battery, and a chemical plating method is utilized to uniformly coat the surface of an active material sulfur elementary substance particle with a layer of high-conductivity metal nickel to obtain an electrode active material with a nickel-sulfur core-shell structure. And thus, the lithium-sulfur battery with high load and high surface capacity is obtained. Compared with the prior art, the preparation method provided by the invention has the advantages of simple steps, high efficiency and low cost, and solves the problems of non-conductivity and shuttle effect of elemental sulfur, volume expansion in the charge-discharge process and the like. More importantly, the lithium-sulfur battery prepared by the invention has extremely high active material loading capacity and surface capacity, and has a very wide practical application prospect.

Description

technical field [0001] The invention relates to materials and preparation methods in the technical field of lithium batteries, in particular to an electrode material with a core-shell structure based on electroless nickel plating, a preparation method thereof, and a lithium-sulfur battery containing the electrode material with a core-shell structure. Background technique [0002] Vehicle-based means of transportation is an important pillar industry of the national economy and plays an important role in the development of the national economy and society. However, traditional transportation energy consumption is also one of the main sources of local environmental pollution and global greenhouse gas emissions. Therefore, the transformation of transportation energy is imperative, and the development of energy-saving vehicles is an effective measure to promote energy conservation and emission reduction and achieve carbon neutrality. In addition, for my country, which is short o...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M10/052
CPCH01M4/366H01M4/38H01M10/052H01M2004/028Y02E60/10
Inventor 胡晓斌林升炫肖佳佳
Owner SHANGHAI JIAO TONG UNIV