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A kind of sns@nsc core-double shell cubic structure composite material and its preparation method and application

A technology of composite materials and cubes, applied in structural parts, electrical components, battery electrodes, etc., can solve problems that need further improvement and unsolved volume expansion of battery electrodes, and achieve strong surface capacitance dynamics and improve electrochemical performance. Performance, easy-to-handle effects

Active Publication Date: 2020-12-08
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no shortage of discussions to alleviate the volume expansion of SnS during charge and discharge through the synergistic effect of atomic doping and nanostructure improvement. Combining the above strategies, a simple and easy method is used to prepare stannous sulfide and carbon composites and discuss their electrochemical properties. Has great significance, such as the nanowire of stannous sulfide-silicon oxide core-shell structure prepared in the patent CN107555401A; the stannous sulfide-nitrogen-doped carbon composite curd prepared in CN108539136A; the stannous sulfide prepared in CN104157851A It is the material of the anchoring center, etc., but none of them solves the volume expansion problem of battery electrodes; the performance of the stannous sulfide composite materials obtained so far in alleviating volume expansion still needs to be further improved

Method used

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  • A kind of sns@nsc core-double shell cubic structure composite material and its preparation method and application
  • A kind of sns@nsc core-double shell cubic structure composite material and its preparation method and application
  • A kind of sns@nsc core-double shell cubic structure composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A SnS@NSC core-double-shell cubic structure composite material, the specific preparation process is as follows:

[0043] S1. Dissolve 50mL of 0.4M SnCl 4 ·5H 2 O solution with 100mL containing 0.2M sodium citrate solution and 100mL 0.1M ZnCl 2 The mixture of the solution was mixed and stirred, and 500 mL of 0.3M NaOH solution was added to the above solution under continuous stirring; after that, it was washed, dried and filtered to obtain a solid cubic precipitate of ZHS.

[0044] S2. Disperse 0.8 g of ZHS cubes in 400 mL of buffer solution and sonicate for 10 minutes; subsequently, add 0.2 g of dopamine and stir at room temperature to form a thin PDA coating; finally, wash, filter and dry to obtain ZHS@PDA black powder.

[0045] S3. Put ZHS@PDA black powder and excess thiourea powder together in a tube furnace, heat to 250°C in a hydrogen atmosphere and keep it warm for 1 hour; after cooling to room temperature, SnS 2 / ZnS@PDA nanocube.

[0046]S4. Selective etchi...

Embodiment 2

[0049] A SnS@NSC core-double-shell cubic structure composite material, the specific preparation process is as follows:

[0050] S1. Dissolve 100mL of 0.2M SnCl 4 ·5H 2 O solution with 100mL containing 0.4M sodium citrate solution and 100mL 0.2M ZnCl 2 The mixture of the solution was mixed and stirred, and 800 mL of 0.2M NaOH solution was added to the above solution under continuous stirring; after that, it was washed, dried and filtered to obtain a solid cubic precipitate of ZHS.

[0051] S2. Disperse 1 g of ZHS cubes in 400 mL of buffer solution and sonicate for 10 minutes. Subsequently, 0.3 g of dopamine was added and stirred at room temperature to form a thin PDA coating; finally, washed, filtered and dried to obtain ZHS@PDA black powder.

[0052] S3. Put ZHS@PDA black powder and excess thiourea powder together in a tube furnace, heat to 250°C in a hydrogen atmosphere and keep it warm for 1 hour; after cooling to room temperature, SnS 2 / ZnS@PDA nanocube.

[0053] S4. ...

Embodiment 3

[0056] A SnS@NSC core-double-shell cubic structure composite material, the specific preparation process is as follows:

[0057] S1. 250mL of 0.2M SnCl 4 ·5H 2 O solution with 250mL containing 0.1M sodium citrate solution and 250mL 0.2M ZnCl 2 The mixture of the solution was mixed and stirred, and 400 mL of 0.3M NaOH solution was added to the above solution under continuous stirring; after that, it was washed, dried and filtered to obtain a solid cubic precipitate of ZHS.

[0058] S2. Disperse 0.6 g of ZHS cubes in 400 mL of buffer solution and sonicate for 10 minutes. Subsequently, 0.2 g of dopamine was added and stirred at room temperature to form a thin PDA coating; finally, washed, filtered and dried to obtain ZHS@PDA black powder.

[0059] S3. Put ZHS@PDA black powder and excess thiourea powder together in a tube furnace, heat to 250°C in a hydrogen atmosphere and keep it warm for 1 hour; after cooling to room temperature, SnS 2 / ZnS@PDA nanocube.

[0060] S4. Selecti...

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Abstract

The invention discloses a SnS@NSC core-double shell cubic structure composite material and a preparation method and application thereof. The composite material is prepared by vulcanizing and carbonizing zinc hydroxystannate having a particle diameter of 500-600 nm and used as a precursor of SnS and dopamine used as a precursor of a carbon shell doped with nitrogen and sulfur by chemical vapor deposition. The composite material of the invention has a specific core-double shell cubic structure. The electrically conductive substrate and the structure support on the outer layer of the composite material enhance the conductivity. In addition, the composite material is doped with nitrogen atoms and sulfur atoms so that the carbon material can obtain more defects to enhance electron conductivity and provide more active sites. Such hybrid layered structure not only accelerates ion and electron transport, but also induces intense surface capacitive dynamics, and accommodates volume expansion during charge / discharge cycles by providing sufficient cavities or void spaces to alleviate electrode pulverization, thereby improving the electrochemical performance of the material and the cycle life of the battery.

Description

technical field [0001] The invention relates to the technical field of electrode materials for sodium-ion batteries and lithium-ion batteries, and more specifically, to a SnS@NSC core-double-shell cubic structure composite material and its preparation method and application. Background technique [0002] In recent years, rechargeable Li-ion batteries and Na-ion batteries have become the main power sources and research hotspots of various portable electronic devices due to their light weight, portability, and high energy density. SnS is a light yellow inorganic compound, as a popular anode material in the field of lithium batteries and sodium batteries, it has high energy density, its large interlayer spacing and weak metal-sulfur bonds are conducive to the intercalation of sodium ions, and Batteries with SnS as anode material should theoretically have good rate performance and long cycle life. [0003] However, SnS has poor conductivity and is prone to volume expansion duri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01M10/054
CPCH01M4/366H01M4/5815H01M4/625H01M10/0525H01M10/054Y02E60/10
Inventor 蔡俊杰陈妙玲曹景茹
Owner GUANGDONG UNIV OF TECH
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