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a kind of s-ni 3 Preparation method of c/nio composite lithium-sulfur battery cathode material

A positive electrode material, lithium-sulfur battery technology, applied in the field of material chemistry, can solve the problems of obvious shuttle effect, low sulfur loading, poor cycle stability, etc., and achieve the effect of shortening the transmission path, high specific capacity, and good cycle life

Active Publication Date: 2022-06-17
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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  • a kind of s-ni <sub>3</sub> Preparation method of c/nio composite lithium-sulfur battery cathode material
  • a kind of s-ni <sub>3</sub> Preparation method of c/nio composite lithium-sulfur battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

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

[0030] 0.8 g of the Ni-BTC prepared in step 1 was placed in a ceramic boat, heated to 350 °C at a heating rate of 1 °C / min in an argon atmosphere, kept for 2 h, and heated at a temperature of 30 mL / min during the heat preservation process. Pass hydrogen into the tube furnace at a rate of 15min, then continue to heat up to 450 ° C, and pass acetylene gas into the tube furnace at a...

Embodiment 2

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

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

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

[0037] 0.5 g of the Ni-BTC material prepared in step 1 was placed in a porcelain boat, heated to 300 °C at a heating rate of 0.5 °C / min in an argon atmosphere, kept for 1 h, and heated at a rate of 20 mL / min during the heat preservation process. Pour hydrogen into the tube furnace at the rate of 10 min, then continue to heat up to 400 °C, and pass acetylene gas into th...

Embodiment 3

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

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

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

[0044] 1 g of the Ni-BTC prepared in the first step was spread on a ceramic boat, heated to 400 °C at a heating rate of 1 °C / min in an argon atmosphere, kept for 2 h, and heated at a temperature of 50 mL / min during the heat preservation process. Pass hydrogen into the tube furnace at a rate of 20min, then continue to heat up to 500 ° C, and pass acetylene gas into t...

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Abstract

The present invention relates to a kind of S-Ni 3 The preparation method of C / NiO composite lithium-sulfur battery cathode material, described method first prepares nickel-based metal-organic framework (Ni-BTC), then utilizes it to prepare nickel carbide / nickel oxide (Ni-BTC) 3 C / NiO) was subsequently compounded with sulfur to obtain S‑Ni 3 C / NiO composites as cathode materials for lithium-sulfur batteries. The hollow spherical structure makes the electrolyte fully contact with the active material, provides more oxidation active sites, and obtains higher specific capacity at high current density. The synergistic effect of nickel oxide and nickel carbide jointly improves the electrochemical performance of lithium-sulfur batteries. performance.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material for a lithium-sulfur battery, in particular to a method for first preparing a nickel-based metal organic framework (Ni-BTC), and then using it to prepare nickel carbide / nickel oxide (Ni-BTC). 3 C / NiO), and then compounded with sulfur to prepare S-Ni 3 The method of C / NiO composite material belongs to the field of material chemistry. Background technique [0002] Lithium-sulfur battery is a kind of lithium battery with sulfur 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 that of the widely used commercial lithium cobalt oxide battery (<150mAh / g). In theory, a lithium-sulfur battery of the same weight could provide an electric vehicle with three times the battery life of current ordinary lithium-ion batteries. In addition, sulfur is a non-polluting, environmentally friendly el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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