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Method for preparing anode material of S-Ni3C/NiO composite lithium-sulfur battery

A cathode material and sulfur battery technology, applied in the field of material chemistry, can solve problems such as poor cycle stability, obvious shuttle effect, and low sulfur load

Active Publication Date: 2020-02-04
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of low sulfur load, obvious shuttle effect, poor cycle stability and other problems existing in the positive electrode materials of lithium-sulfur batteries, and provides a preparation method for the positive electrode materials of lithium-sulfur batteries

Method used

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  • Method for preparing anode material of S-Ni3C/NiO composite lithium-sulfur battery
  • Method for preparing anode material of S-Ni3C/NiO composite lithium-sulfur battery

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The first step is to prepare Ni-BTC material:

[0028] Mix 20mL deionized water, 20mL absolute ethanol, 20mL N, N dimethylformamide according to volume ratio 1:1:1, add 0.6g nickel nitrate, 0.4g trimesic acid, 2.5g polyvinylpyrrolidone, stir 1h, ultrasound 1h. After completion, it was transferred to a polytetrafluoroethylene-lined stainless steel reactor, and kept at 180°C for 12 hours. After completion, the product was collected, washed with methanol three times, and then dried to obtain a Ni-BTC material.

[0029] The second step is to prepare Ni 3 C / NiO material:

[0030] Spread 0.8g of Ni-BTC prepared in step 1 on a porcelain boat, raise the temperature to 350°C at a rate of 1°C / min under an argon atmosphere, keep it warm for 2 hours, and heat it at a temperature of 30mL / min during the heat preservation process. Feed hydrogen gas into the tube furnace at a rate of 15 minutes, then continue to heat up to 450 ° C, and feed acetylene gas into the tube furnace at a r...

Embodiment 2

[0034] The first step is to prepare Ni-BTC material:

[0035] Mix 15mL deionized water, 15mL absolute ethanol, 15mL N, N dimethylformamide according to volume ratio 1:1:1, add 0.5g nickel nitrate, 0.3g trimesic acid, 2g polyvinylpyrrolidone, stir for 0.5 h, ultrasonic 0.5h. After the completion, it was transferred to a polytetrafluoroethylene-lined stainless steel reaction kettle, and kept at 160 degrees Celsius for 12 hours. After the reaction was completed, the product was collected, washed with methanol three times, and then dried.

[0036] The second step is to prepare Ni 3 C / NiO material:

[0037] Spread 0.5g of the Ni-BTC material prepared in step 1 on a porcelain boat, raise the temperature to 300°C at a rate of 0.5°C / min under an argon atmosphere, keep it warm for 1h, and heat it at 20mL / min during the heat preservation process. Pass hydrogen into the tube furnace at a rate of 10 min, then continue to heat up to 400 ° C, and pass acetylene gas into the tube furnace ...

Embodiment 3

[0041] The first step is to prepare Ni-BTC material:

[0042]Mix 30mL deionized water, 30mL absolute ethanol, 30mL N, N dimethylformamide according to volume ratio 1:1:3, add 1g nickel nitrate, 0.6g trimesic acid, 3g polyvinylpyrrolidone, stir for 1h, Ultrasound for 1h. After the completion, it was transferred to a polytetrafluoroethylene-lined stainless steel reaction kettle, and kept at 200 degrees Celsius for 24 hours. After the reaction was completed, the product was collected, washed with methanol three times, and then dried to obtain a Ni-BTC material.

[0043] The second step is to prepare Ni 3 C / NiO material:

[0044] Spread 1 g of Ni-BTC prepared in the first step on a porcelain boat, raise the temperature to 400°C at a rate of 1°C / min under an argon atmosphere, keep it warm for 2 hours, and heat it at a rate of 50mL / min during the heat preservation process. Feed hydrogen gas into the tube furnace at a rate of 20 min, then continue to heat up to 500 ° C, and feed a...

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Abstract

The invention relates to a method for preparing an anode material of an S-Ni3C / NiO composite lithium-sulfur battery. The method comprises the steps of: firstly preparing a nickel-based metal organic frame (Ni-BTC), then using the nickel-based metal organic frame to prepare nickel carbide / nickel oxide (Ni3C / NiO), and then preparing an S-Ni3C / NiO composite material by compounding the nickel carbide / nickel oxide with sulfur to serve as the anode material of the lithium-sulfur battery. A hollow spherical structure ensures full contact between electrolyte and active substances to provide more oxidative active sites, the nickel oxide with higher specific capacity is obtained at high current density to cooperate with the nickel carbide to improve the electrochemical performance of the lithium-sulfur battery together.

Description

technical field [0001] The present invention relates to a kind of preparation method of anode material of lithium sulfur battery, particularly relate to a kind of firstly prepare nickel-based metal-organic framework (Ni-BTC), then use it to prepare nickel carbide / nickel oxide (Ni-BTC) 3 C / NiO), followed by compounding with sulfur to obtain S-Ni 3 A method for C / NiO composites, belonging to the field of materials chemistry. Background technique [0002] Lithium-sulfur battery is a kind of lithium battery with sulfur element as the positive electrode and metal lithium as the negative electrode. Its specific capacity is as high as 1675mAh / g, which is much higher than the capacity of lithium cobalt oxide batteries (<150mAh / g) widely used in commerce. In theory, lithium-sulfur batteries of the same weight can provide electric vehicles with three times the battery life of current ordinary lithium-ion batteries. In addition, sulfur is a non-polluting, environmentally friendly ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525
CPCH01M4/366H01M4/48H01M4/583H01M10/0525H01M2004/028Y02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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