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Composite sulfide as well as preparation method and application thereof

A sulfide, sulfur source technology, applied in chemical instruments and methods, antimony sulfide, antimony compounds, etc., can solve the problems of limited sodium ion battery application, low sodium ion diffusion rate, complex preparation process, etc., to achieve excellent low-temperature electrochemical The effect of good performance, material morphology, and high product phase purity

Pending Publication Date: 2022-02-11
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing technical solutions provide a variety of preparation methods for sodium ion batteries, and improve the performance of sodium ion batteries by coating and multi-metal co-doping. However, the sodium ion diffusion of the currently prepared sodium ion batteries at low temperatures The low rate, poor capacity, and complicated preparation process limit the practical application of sodium-ion batteries; therefore, it is of great significance to develop a sodium-ion battery with better electrochemical performance at low temperature

Method used

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  • Composite sulfide as well as preparation method and application thereof
  • Composite sulfide as well as preparation method and application thereof
  • Composite sulfide as well as preparation method and application thereof

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preparation example Construction

[0041] In order to solve at least the above-mentioned problems, the embodiment part of the present invention provides a kind of preparation method of composite sulfide, and described preparation method comprises:

[0042] heat-treating the precursor and the sulfur source at 450°C to 650°C to obtain the composite sulfide,

[0043] Wherein, the precursor includes XSb, and X includes Ga and / or In.

[0044] The invention heat-treats the precursor GaSb and / or InSb and the sulfur source at a specific temperature, and through the gas-solid reaction, the sulfur atoms are diffused into the GaSb and / or InSb lattice under thermodynamic drive, and transformed into antimony gallium sulfide and / or antimony indium sulfide, the prepared composite sulfide has higher first-cycle specific capacity, better cycle stability and excellent low-temperature electrochemical performance.

[0045] In some embodiments, the molar ratio of the precursor to the sulfur source is 1:(10 to 30).

[0046] Furt...

Embodiment 1

[0058] This embodiment provides a method for preparing composite sulfides, the preparation method comprising: placing GaSb powder in a tube furnace, feeding H 2 S gas was heat-treated at 550°C for 9 hours, and the protective gas for heat treatment was argon, H 2 The flow rate of S gas is 120mL / min, the flow rate of argon gas is 250mL / min, and the heating rate of heat treatment is 5°C / min to obtain the composite sulfide; wherein, GaSb powder and H 2 The molar ratio of S gas is 1:20.

[0059] The composite sulfide prepared in this example includes Ga 2 S 3 and Sb 2 S 3 , denoted as Ga 2 S 3 -Sb 2 S 3 .

[0060] figure 1 For the XRD pattern of the composite sulfide prepared in this embodiment, the peak position in the figure corresponds well, indicating that the synthesized Ga 2 S 3 -Sb 2 S 3 Higher purity.

Embodiment 2

[0062] This embodiment provides a method for preparing a composite sulfide, the preparation method comprising: placing InSb powder and GaSb powder with a mass ratio of 1:1 in a tube furnace, feeding H 2 S gas was heat treated at 500°C for 10.5h, and the protective gas for heat treatment was nitrogen, H 2 The flow rate of the S gas was 120 mL / min, the flow rate of the nitrogen gas was 250 mL / min, and the heating rate of the heat treatment was 6° C. / min to obtain the composite sulfide. Among them, InSb powder and GaSb powder with H 2 The molar ratio of S gas is 1:15.

[0063] The composite sulfide prepared in this example includes Ga 2 S 3 、In 2 S 3 and Sb 2 S 3 .

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Abstract

The invention provides a composite sulfide and a preparation method and application thereof. The preparation method comprises the steps that a precursor and a sulfur source are subjected to heat treatment at the temperature of 450 DEG C-650 DEG C to obtain the composite sulfide, wherein the precursor comprises XSb, and X comprises Ga and / or In. The precursor and the sulfur source are subjected to heat treatment at a specific temperature to prepare the composite sulfide, and the prepared composite sulfide has excellent low-temperature performance. The sodium-ion battery prepared from the composite sulfide has relatively high first-circle specific capacity, relatively good rate capability, relatively good cycling stability and excellent low-temperature electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a composite sulfide and its preparation method and application. Background technique [0002] With the increasingly severe energy problems, new energy sources such as solar energy, wind energy, and thermal energy have gradually become research hotspots. Among them, the development of large-scale energy storage equipment is crucial to actual life and production. As a chemical energy storage device with high energy conversion efficiency, light weight, and excellent performance, lithium-ion batteries can play the role of cyclic energy storage, and are currently one of the most widely used new energy sources. However, with the large-scale development and production of lithium battery products, lithium resource reserves are difficult to meet the demand, hindering the further development of lithium ion batteries. Therefore, sodium-ion batteries, which have more abundant reserves and s...

Claims

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Application Information

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IPC IPC(8): C01G15/00C01G30/00H01M4/1397H01M4/36H01M4/58
CPCC01G15/00C01G30/008H01M4/1397H01M4/364H01M4/5815H01M2004/027C01P2002/72C01P2004/80C01P2006/40Y02E60/10
Inventor 莫方杰孙化雨
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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