Preparation method and application of high-sulfur content carbon and sulfur lithium ion battery material

A technology of lithium-ion batteries and ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor battery cycle performance, poor conductivity of lithium sulfide, and internal resistance of corroded batteries, so as to improve specific capacity and cycle Performance, high specific capacity, full and efficient utilization

Active Publication Date: 2015-05-13
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the shuttle effect, the dissolved lithium polysulfide will pass through the separator and reach the lithium sheet of the negative electrode, and the resulting lithium sulfide and other products have poor conductivity and are insoluble, which will cause corrosion of the negative electrode and increase the internal resistance of the battery, resulting in poor cycle performance of the battery. , the capacity gradually decreases

Method used

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  • Preparation method and application of high-sulfur content carbon and sulfur lithium ion battery material
  • Preparation method and application of high-sulfur content carbon and sulfur lithium ion battery material
  • Preparation method and application of high-sulfur content carbon and sulfur lithium ion battery material

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Effect test

Embodiment 1

[0024] Embodiment 1. High sulfur content novel carbon-sulfur molecular material initial product

[0025] Accurately weigh 2g of elemental sulfur, add it to a 100ml stainless steel autoclave, measure 12ml of hexachlorobutadiene (20g) with a graduated cylinder, slowly add it to the stainless steel autoclave containing elemental sulfur, and cover the lid of the autoclave , After making sure that it is tightened, pour in 1MPa protective gas argon, and use an oven to raise the temperature to 100°C for 1 hour. After the reaction, cool down to room temperature naturally, open the reaction kettle, collect the black product in the kettle into a 50ml centrifuge tube with a straw, centrifuge at 8000r / min for 15 minutes, absorb the upper yellow liquid, and add absolute ethanol to the centrifuge tube Centrifuge, repeat 3 times, discard the supernatant and then add ethanol aqueous solution with a volume concentration of 50% to centrifuge, repeat 3 times, finally discard the supernatant and ...

Embodiment 2

[0026] Embodiment 2. High sulfur content novel carbon-sulfur molecular material initial product

[0027] Accurately weigh 2g of elemental sulfur, add it to a 100ml stainless steel autoclave, measure 24ml of hexachlorobutadiene (40g) with a graduated cylinder, slowly add it to the stainless steel autoclave containing elemental sulfur, and cover the lid of the autoclave , After making sure that it is tightened, pour in 5MPa protective gas argon, and use an oven to heat up to 150°C for 20h. After the reaction, cool down to room temperature naturally, open the reaction kettle, collect the black product in the kettle into a 50ml centrifuge tube with a straw, centrifuge at 8000r / min for 15 minutes, absorb the upper yellow liquid, and add absolute ethanol to the centrifuge tube Centrifuge, repeat 3 times, discard the supernatant and then add ethanol aqueous solution with a volume concentration of 50% to centrifuge, repeat 3 times, finally discard the supernatant and add absolute etha...

Embodiment 3

[0028] Embodiment 3. High sulfur content novel carbon-sulfur molecular material primary product

[0029] Accurately weigh 2g of elemental sulfur, add it to a 100ml stainless steel autoclave, measure 36ml of hexachlorobutadiene (60g) with a graduated cylinder, slowly add it to the stainless steel autoclave containing elemental sulfur, and cover the lid of the autoclave , After making sure that it is tightened, pour in 10MPa protective gas argon, and use an oven to heat up to 200°C for 20h. After the reaction, cool down to room temperature naturally, open the reaction kettle, collect the black product in the kettle into a 50ml centrifuge tube with a straw, centrifuge at 8000r / min for 15 minutes, absorb the upper yellow liquid, and add absolute ethanol to the centrifuge tube Centrifuge, repeat 3 times, discard the supernatant and then add ethanol aqueous solution with a volume concentration of 50% to centrifuge, repeat 3 times, finally discard the supernatant and add absolute eth...

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Abstract

The invention discloses a preparation method and application of a high-sulfur content carbon and sulfur lithium ion battery material. The method comprises the following steps: adding elemental sulfur into a reaction vessel, injecting hexachlorobutadiene to perform closed reaction under the conditions that the temperature is 100-300 DEG C, and the pressure is 0-15 MPa, centrifuging after post-treatment, precipitating and washing, and drying to obtain a primary product; performing heat treatment in a tube furnace for 30 minutes-4 hours under the inert gas protection. The invention provides the application of a novel high-sulfur content carbon and sulfur material to a lithium ion battery. The method is extremely simple, the raw material source is rich, carbon atoms and sulfur atoms of the prepared novel high-sulfur content carbon and sulfur material are combined in a way of a chemical bond, and the mass percentage occupied by the content of sulfur elements in the material can reach 10-80 percent. The carbon and the sulfur atoms are mutually combined through the chemical bond, the sulfur atoms are uniformly dispersed in the material so as to be in full contact and react with lithium ions in the charging and discharging processes, therefore the specific capacity and the cycling performance of the lithium ion battery are greatly improved.

Description

technical field [0001] The present invention relates to the preparation of nanometer materials and lithium-ion battery electrode materials, in particular to a preparation method of a novel carbon-sulfur material with a high sulfur content, and a novel carbon-sulfur material with a high sulfur content used as a battery cathode material in a lithium-sulfur secondary battery Applications. Background technique [0002] With the sharp increase in the consumption of fossil fuels (coal, oil, natural gas) and the depletion of energy resource reserves, as well as a series of environmental and pollution problems, it is urgent to find energy technologies that are environmentally friendly and sustainable. A lithium-sulfur battery is a secondary battery that uses metallic lithium as the negative electrode and a sulfur-containing material as the positive electrode. As a new type of energy conversion device, lithium-sulfur battery has an energy density of up to 2600wh / kg, which is much la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525H01M4/136
CPCH01M4/5815H01M10/0525Y02E60/10
Inventor 薛立新王健温乐乐秦德君
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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