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SnS/Ti02/rGO composite material for a potassium-ion battery negative electrode, preparation method thereof and matching electrolyte

A composite material and battery negative electrode technology, applied in the field of electrochemistry, can solve problems such as the inability to guarantee the kinetic properties of the modified material, the uniformity of the thickness, and the uncontrollable thickness of the coating layer, so as to improve the cycle stability, The effect of enhancing electrical conductivity and maintaining structural stability

Inactive Publication Date: 2020-02-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the disadvantage of the above method is that it is difficult to form a complete coating layer. If a complete coating layer is to be formed, more coating substances are needed, and the dynamic performance of the modified material cannot be guaranteed; at the same time, the thickness of the coating layer Uncontrollable, the uniformity of thickness cannot be guaranteed

Method used

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  • SnS/Ti02/rGO composite material for a potassium-ion battery negative electrode, preparation method thereof and matching electrolyte
  • SnS/Ti02/rGO composite material for a potassium-ion battery negative electrode, preparation method thereof and matching electrolyte
  • SnS/Ti02/rGO composite material for a potassium-ion battery negative electrode, preparation method thereof and matching electrolyte

Examples

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Effect test

Embodiment 1

[0046] A kind of SnS / TiO for negative electrode of potassium ion battery 2 The preparation method of / rGO composite material comprises steps as follows:

[0047] (1) Disperse 60mg graphene oxide in 50ml deionized water, add 0.8765g SnCl 4 ·5H 2 O and 0.56g thioacetamide were mixed evenly to obtain a reaction solution, which was hydrothermally reacted at 95°C for 6 hours, washed with deionized water, centrifuged three times, and then freeze-dried for 48 hours to obtain SnS 2 / rGO composites.

[0048] (2) SnS prepared in step (1) 2 / rGO composites in H 2 / Ar(H 2 SnS / rGO composites were obtained by calcining at 500 °C for 2 hours in an atmosphere with a volume ratio of 0.1:1 to Ar.

[0049] (3) Put the SnS / rGO composite material prepared in step (2) into the reaction chamber of the atomic layer deposition equipment filled with argon gas in advance, raise it to the reaction temperature, and keep the temperature of the reaction chamber at 220 ° C, and send to the above reactio...

Embodiment 2

[0054] A kind of SnS / TiO for negative electrode of potassium ion battery 2 The preparation method of / rGO composite material comprises steps as follows:

[0055] (1) Disperse 60mg graphene oxide in 50ml deionized water, add 0.8765g SnCl 4 ·5H 2 O and 0.56g thioacetamide were mixed evenly to obtain a reaction solution, and the resulting reaction solution was hydrothermally reacted at 110°C for 6 hours, washed with deionized water, centrifuged three times, and then freeze-dried for 48 hours to obtain SnS 2 / rGO composites.

[0056] (2) SnS prepared in step (1) 2 / rGO composites in H 2 / Ar(H 2 SnS / rGO composites were obtained by calcining at 600 °C for 3 hours in an atmosphere with a volume ratio of 0.1:1 to Ar.

[0057] (3) Put the SnS / rGO composite material prepared in step (2) into the reaction chamber of the atomic layer deposition equipment filled with argon in advance, raise it to the reaction temperature, and keep the temperature of the reaction chamber at 250 ° C; F...

Embodiment 3

[0059] A kind of SnS / TiO for negative electrode of potassium ion battery 2 The preparation method of / rGO composite material comprises steps as follows:

[0060] (1) Disperse 60mg graphene oxide in 50ml deionized water, add 0.8765g SnCl 4 ·5H 2 O and 0.56 g of thioacetamide were mixed evenly to obtain a reaction solution, and the resulting reaction solution was hydrothermally reacted at 150 ° C for 6 hours, washed with deionized water, centrifuged three times, and then freeze-dried for 48 hours to obtain SnS2 / rGO composites.

[0061] (2) SnS prepared in step (1) 2 / rGO composites in H 2 / Ar(H 2 SnS / rGO composites were obtained by calcining at 700 °C for 3 hours in an atmosphere with a volume ratio of 0.1:1 to Ar.

[0062] (3) Put the SnS / rGO composite material prepared in step (2) into the reaction chamber of the atomic layer deposition equipment filled with argon in advance, raise it to the reaction temperature, and keep the temperature of the reaction chamber at 250 ° C...

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Abstract

The invention provides a SnS / Ti02 / rGO composite material for a potassium-ion battery negative electrode, a preparation method thereof and a matching electrolyte. In the SnS / Ti02 / rGO composite material, the SnS has a mass fraction of 80% or more, and the Ti02 has a mass fraction of 2% or less. The microstructure of the SnS / Ti02 / rGO composite material is that TiS-coated SnS nanoparticles are uniformly distributed on a reduced graphene oxide substrate, and have a particle size of 10-100 nm. The invention also provides a method for preparing the composite material and a matching electrolyte. The TiO2 coating has a protective effect on the SnS nanoparticles, and reduces the negative impact of the coating on material dynamics, provides the material with better electrochemical performance, and further improves the cyclic stable performance of the potassium-ion battery using the material through the optimization of the electrolyte.

Description

technical field [0001] The invention relates to a kind of SnS / TiO used for negative electrode of potassium ion battery 2 The / rGO composite material, its preparation method and its matching electrolyte, especially the improvement of its electrochemical performance by optimizing the electrolyte, belong to the field of electrochemical technology. Background technique [0002] With the rapid development of electrochemical energy storage technology, the market demand for renewable and efficient energy storage devices is increasing, and rechargeable lithium-ion batteries currently dominate the electrochemical energy storage market. However, the further application of lithium-ion batteries in the field of large-scale energy storage has been constrained by problems such as high cost, limited reserves (0.0017wt.% of the earth's crust), and uneven distribution of lithium resources. Therefore, it is of great practical significance to explore alternative battery systems. In recent ye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054H01M10/0568H01M10/0569
CPCH01M4/366H01M4/5815H01M4/625H01M4/628H01M10/054H01M10/0568H01M10/0569H01M2004/021H01M2004/027Y02E60/10
Inventor 顾鑫赵学波温盛刘丹丹李良军代鹏程
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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