Preparation method of ordered nano-array nitrogen-sulfur double-doped compound carbon rod material and lithium-sulfur battery

A nano-array and nano-carbon rod technology is used in the preparation of ordered nano-array nitrogen-sulfur double-doped carbon-sulfur composite carbon rod materials, and in the field of lithium-sulfur batteries, which can solve the problem that it is difficult to meet the requirements of secondary batteries and the practical application of fuel cells. , limit the large-scale application and other problems, to achieve the effect of improving electrochemical performance, low cost and excellent performance

Active Publication Date: 2019-04-23
HUNAN UNIV OF TECH
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  • Summary
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Problems solved by technology

[0003] Lithium-ion batteries use graphite materials as the negative electrode, and lithium-containing metal oxides such as lithium iron phosphate, lithium cobaltate, and lithium manganate as the positive electrode, and use the "rocking chair effect" of lithium ions between the positive and negative electrodes to contribute capacity. The theoretical specific capacity of the secondary lithium-ion battery itself is nearly 300mAh / g. Even so, it is difficult to meet the requirements of the secondary battery that people need. At the same time, it is difficult for the fuel cell to be practical in a short time, so it has a theoretical capacity of 2600 Wh / kg. Specific energy lithium-sulfur battery has become the current research and development object
[0004] Lithium-sulfur batteries use elemental sulfur as the positive electrode and metallic lithium as the negative electrode. The theoretical specific capacity of elemental sulfur reaches 1680mAh / g, and elemental sulfur is cheap, rich in resources, and environmentally friendly. To a certain extent, it can replace lithium-ion batteries. However, the actual specific capacity of lithium-sulfur batteries is much smaller than the theoretical specific capacity, thus limiting its large-scale application.
The main reason for this phenomenon is that during the charging and discharging cycle of lithium-sulfur batteries, polysulfides are easily soluble in the electrolyte, and at the end of the cycle, not all of them are converted into final products, resulting in the loss of effective substances The "shuttle effect" caused by the dissolution of polysulfides greatly reduces the capacity of lithium-sulfur batteries

Method used

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  • Preparation method of ordered nano-array nitrogen-sulfur double-doped compound carbon rod material and lithium-sulfur battery
  • Preparation method of ordered nano-array nitrogen-sulfur double-doped compound carbon rod material and lithium-sulfur battery
  • Preparation method of ordered nano-array nitrogen-sulfur double-doped compound carbon rod material and lithium-sulfur battery

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Embodiment 1

[0037] This embodiment provides a method for preparing an ordered nano-array nitrogen-sulfur double-doped carbon-sulfur composite carbon rod material, including the following steps:

[0038] S1. Mix and grind the tea seed cake and KOH at a weight ratio of 1:4, put it into a stainless steel autoclave, add 60mL of distilled water and stir evenly, add 20mL of formaldehyde solution with a concentration of 36.5%, seal the autoclave and place it at 80°C 3 hours in a blast drying oven, then react at 180°C for 12 hours, after cooling to room temperature, take out the sample, filter, wash and dry with distilled water to obtain ordered nanoarray precursor carbon rods;

[0039] S2. Place the dried ordered nanoarray precursor carbon rod obtained in step S1 in a quartz boat and place it in a tube furnace, and calcinate it at 800° C. for 2 hours under the protection of argon flow, and use dilute nitric acid and Wash the sample thoroughly with distilled water to obtain an ordered array of ca...

Embodiment 2

[0043] This embodiment provides a method for preparing an ordered nano-array nitrogen-sulfur double-doped carbon-sulfur composite carbon rod material, including the following steps:

[0044] S1. Mix and grind nut shells and KOH at a weight ratio of 1:3, put them into a stainless steel autoclave, add 60mL of distilled water and stir evenly, add 20mL of formaldehyde solution with a concentration of 36.5%, seal the autoclave and place it in a drum at 80°C Air drying oven for 3 hours, then react at 180°C for 12 hours, after cooling to room temperature, take out the sample, filter, wash and dry with distilled water to obtain ordered nanoarray precursor carbon rods;

[0045] S2. Place the dried ordered nanoarray precursor carbon rod obtained in step S1 in a quartz boat and place it in a tube furnace, and calcinate it at 800° C. for 1 hour under the protection of argon flow, and use dilute nitric acid and Wash the sample thoroughly with distilled water to obtain an ordered array of car...

Embodiment 3

[0049] This embodiment provides a method for preparing an ordered nano-array nitrogen-sulfur double-doped carbon-sulfur composite carbon rod material, including the following steps:

[0050] S1. Mix and grind the peanut cake and KOH at a weight ratio of 1:4, put it into a stainless steel autoclave, add 60mL of distilled water and stir evenly, add 20mL of formaldehyde solution with a concentration of 36.5%, seal the autoclave and place it in a drum at 80°C Air drying oven for 3 hours, then react at 180°C for 12 hours, after cooling to room temperature, take out the sample, filter, wash and dry with distilled water to obtain ordered nanoarray precursor carbon rods;

[0051] S2. Place the dried ordered nanoarray precursor carbon rod obtained in step S1 in a quartz boat and place it in a tube furnace, and calcinate it at 800° C. for 1 hour under the protection of argon flow, and use dilute nitric acid and Wash the sample thoroughly with distilled water to obtain an ordered array o...

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Abstract

The invention belongs to the technical field of electrode materials and discloses a preparation method of an ordered nano-array nitrogen-sulfur double-doped compound carbon rod material. The preparation method of the ordered nano-array nitrogen-sulfur double-doped compound carbon rod material comprises the following steps of S1, preparing an ordered nano-array precursor carbon rod; S2, preparing an ordered nano-carbon rod array; S3, preparing the ordered nano-array nitrogen-sulfur double-doped compound carbon rod material. The ordered nano-array nitrogen-sulfur double-doped compound carbon rodmaterial is applied as the anode material of a lithium/sulfur ion battery. The anode material of the lithium/sulfur ion battery prepared from the ordered nano-array nitrogen-sulfur double-doped compound carbon rod material is better in morphology and performance than common carbon materials and can achieve high first discharge specific capacity and a high capacity retention ratio; meanwhile, thepreparation method of the ordered nano-array nitrogen-sulfur double-doped compound carbon rod material is simple, easy to implement, low in cost, green and environmentally friendly and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and more specifically relates to a preparation method of an ordered nano-array nitrogen-sulfur double-doped carbon-sulfur composite carbon rod material and a lithium-sulfur battery. Background technique [0002] Energy issues and environmental issues are two major issues facing society today. Energy is not only the basis for people's survival, but also an important factor affecting the contemporary economy. For a long time, petroleum, coal, and natural gas have been used as the most important sources of energy. Their excessive use has made the energy structure unreasonable, caused serious environmental pollution, and affected the ecological environment of the earth. The greenhouse effect caused by the emission of carbon dioxide in particular leads to global warming, which also triggers a series of climate changes. In addition, the reserves of fossil fuels are limited, especially the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525H01M4/13B82Y30/00B82Y40/00
CPCH01M4/13H01M4/364H01M4/38H01M4/625H01M4/628H01M10/0525B82Y30/00B82Y40/00H01M2004/028Y02E60/10
Inventor 陈晗卢小伟向楷雄朱裔荣肖利陈宪宏陈文昊
Owner HUNAN UNIV OF TECH
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