A kind of antimony trisulfide nano-dot/sulfur-doped carbon composite material and its preparation method and application in sodium/potassium ion battery

A carbon composite material and nano-dot technology, which is applied in the preparation/purification of carbon, antimony sulfide, secondary batteries, etc., can solve the problems of volume expansion, insufficient material cycle stability, large volume expansion, etc., to improve conductivity, Improve the electrochemical performance, inhibit the conversion reaction and the effect of

Active Publication Date: 2021-08-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The metal sulfide nanomaterial antimony trisulfide has high capacity characteristics and has attracted widespread attention in recent years. Studies have shown that antimony trisulfide can exhibit excellent performance in lithium-ion batteries and sodium-ion batteries, but the research on its potassium ion performance still in the preliminary stages of exploration
The performance results of lithium-ion and sodium-ion batteries of antimony trisulfide show that there is a large volume expansion of antimony trisulfide materials during charge and discharge, and the cycle stability of the materials is generally insufficient.
Aiming at the serious volume expansion problem of antimony trisulfide material in bulk phase transformation reaction and alloying reaction

Method used

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  • A kind of antimony trisulfide nano-dot/sulfur-doped carbon composite material and its preparation method and application in sodium/potassium ion battery
  • A kind of antimony trisulfide nano-dot/sulfur-doped carbon composite material and its preparation method and application in sodium/potassium ion battery
  • A kind of antimony trisulfide nano-dot/sulfur-doped carbon composite material and its preparation method and application in sodium/potassium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put 6 grams of sodium antimony gluconate into a porcelain boat and put it in a tube furnace, and inject H 2 / Ar(5%H 2 ) protective gas, the heating rate is 10°C / min, and calcined at 600°C for 1 hour to obtain black porous powder. Take out the powder in the porcelain boat and grind it thoroughly, then wash it repeatedly several times with ethanol and water at intervals, and dry it in a vacuum oven at 70°C for 6 hours to obtain the black antimony / C nano-dot composite material with a nano-dot size of about 10 ~20nm. figure 1 It is the transmission electron microscope image of the antimony nanodot / carbon composite material.

Embodiment 2

[0035] Put 6 grams of antimony hexamethyltetramine into a ceramic boat and put it in a tube furnace, and pass H 2 / Ar(5%H 2 ) protective gas, the heating rate is 10°C / min, and calcined at 600°C for 1 hour to obtain black porous powder. Take out the powder in the porcelain boat and grind it thoroughly, then wash it several times with ethanol and water at intervals, and dry it in a vacuum oven at 70°C for 6 hours to obtain the black antimony nanodot / carbon composite material, the size of the nanodot is about 15 ~30nm.

Embodiment 3

[0037] Grind 300 mg of antimony nano-dots / carbon composite material and 900 mg of sulfur powder in an agate agate mortar evenly, and then place it in a tube furnace, pass into Ar protective gas, and heat up at a rate of 5 °C / min. Calcined at 500°C for 5h to obtain black Sb 2 S 3 Nano-dot / sulfur-doped carbon composite material, the size of the nano-dot is about 15-25nm. figure 2 for Sb 2 S 3 TEM image of nanodot / sulfur-doped carbon composite.

[0038] by Sb 2 S 3 / C nano-dot composite material, for infrared and Raman analysis testing, Figure 9 a The mid-infrared results show that Sb 2 S 3 The absorption peaks of nanodots / sulfur-doped carbon composites are located at 1387 and 1124 cm -1 Left and right, attributed to the C-C and C-S bonds, respectively, confirming the existence of the C-S bond; at the same time, the Raman test results are as follows Figure 9 As shown in b, located at 144, 251, 310 and 451cm -1 The absorption peaks are attributed to C-S-C, Sb-S-Sb be...

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Abstract

The invention discloses an antimony trisulfide nano-dot / sulfur-doped carbon composite material, a preparation method thereof and an application in a sodium / potassium ion battery. Composites made of Sb 2 S 3 The nano-dots are uniformly distributed in the pores and surfaces of sulfur-doped carbon. The preparation method is to place the organic antimony salt in a reducing atmosphere for reduction treatment to obtain antimony nano-dots / carbon composite materials, antimony nano-dots / carbon composite materials and The sulfur source is placed under a protective atmosphere for solid-state reaction to obtain. The Sb of the composite 2 S 3 It is a nano-dot material with unique volume effect, surface effect, quantum size effect and macroscopic quantum tunneling effect, etc., which can effectively improve the electrochemical performance of the composite material, and the sulfur-doped carbon carrier can improve the conductivity of the composite material, and at the same time It can alleviate the large volume expansion of antimony trisulfide material during charging and discharging, and it is used in sodium-ion and potassium-ion batteries to show high capacity and good cycle stability.

Description

technical field [0001] The invention relates to a negative electrode material for a sodium / potassium ion battery, in particular to a Sb 2 S 3 The nano-dot / sulfur-doped carbon composite material also relates to its preparation method and its application as a negative electrode material for sodium-ion or potassium-ion batteries, belonging to the fields of new energy storage materials and electrochemistry. Background technique [0002] The need for green energy conversion and storage in various applications such as portable electronic devices, electric vehicles, and large-scale power stations drives the exploration of advanced energy storage technologies. A variety of energy storage devices have been designed and studied for different energy storage requirements. Among them, lithium-ion batteries have penetrated into many aspects of daily life since their commercialization in the 1990s due to their advantages such as high specific capacity, long cycle life, high working volta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525H01M10/054C01B32/05C01G30/00B82Y30/00
CPCB82Y30/00C01G30/008C01P2002/72C01P2004/04C01P2006/40C01B32/05H01M4/5815H01M4/625H01M10/0525H01M10/054Y02E60/10
Inventor 侯红帅杨莉纪效波邹国强
Owner CENT SOUTH UNIV
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