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A method for rapid filling of microporous sulfur with high current density in lithium-sulfur batteries

A high current density, lithium-sulfur battery technology, applied in battery electrodes, secondary battery charging/discharging, secondary batteries, etc., can solve the problems of long battery cycle, specific capacity decay, complex composite process, etc., to achieve cycle stability Improve, reduce energy consumption, reduce the effect of absorption process

Inactive Publication Date: 2019-06-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This composite process is too complicated, not only requires high temperature sulfur filling, but also needs to do surface treatment, making the cycle of making batteries too long
At the same time, when studying the electrical properties of lithium-sulfur batteries, the specific capacity of the battery will gradually decay when testing the cycle life.
Due to the attenuation of the specific capacity, the instability of the battery is caused, and it is difficult to be applied in the real industry

Method used

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  • A method for rapid filling of microporous sulfur with high current density in lithium-sulfur batteries
  • A method for rapid filling of microporous sulfur with high current density in lithium-sulfur batteries
  • A method for rapid filling of microporous sulfur with high current density in lithium-sulfur batteries

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Embodiment 1

[0029] A method for rapidly filling microporous sulfur with high current density in a lithium-sulfur battery, comprising the steps of:

[0030] (1) Synthesis of microporous carbon material MC: 1.2g of zinc nitrate hexahydrate was dissolved in 80mL of methanol, and 2.7g of 2-methylimidazole was dissolved in 80mL of methanol. After stirring for 30min, the dissolved 2-formazol Pour the methanol solution of imidazole into the methanol solution of zinc nitrate hexahydrate, stir for 5 hours, filter and dry to obtain ZIF-8; carbonize ZIF-8 in a tube furnace, from room temperature to 800 °C, 5 °C / min heating rate, heat preservation 3h, after cooling down, the microporous carbon material MC is obtained;

[0031] (2) The microporous carbon material MC and elemental sulfur are added to carbon disulfide in a mass ratio of 85:15, the ultrasonic power is 99kHz, and the time is 30min. After mixing evenly, a mixed material is obtained;

[0032] (3) Place the mixed material obtained in step ...

Embodiment 2

[0036] A method for rapidly filling microporous sulfur with high current density in a lithium-sulfur battery, comprising the steps of:

[0037] (1) Synthesis of microporous carbon material MC: 2.4g of zinc nitrate hexahydrate was dissolved in 80mL of methanol, and 5.4g of 2-methylimidazole was dissolved in 80mL of methanol. After stirring for 30min, the dissolved 2-formazol Pour the methanol solution of imidazole into the methanol solution of zinc nitrate hexahydrate, stir for 5 hours, filter and dry to obtain ZIF-8; carbonize ZIF-8 in a tube furnace, from room temperature to 800 °C, 5 °C / min heating rate, heat preservation 3h, after cooling down, the microporous carbon material MC is obtained;

[0038] (2) The microporous carbon material MC and elemental sulfur are added to carbon disulfide in a mass ratio of 85:15, the ultrasonic power is 99kHz, and the time is 30min. After mixing evenly, a mixed material is obtained;

[0039] (3) Place the mixed material obtained in step ...

Embodiment 3

[0043] A method for rapidly filling microporous sulfur with high current density in a lithium-sulfur battery, comprising the steps of:

[0044] (1) Synthesis of microporous carbon material MC: 3.6g of zinc nitrate hexahydrate was dissolved in 80mL of methanol, and 8.1g of 2-methylimidazole was dissolved in 80mL of methanol. After stirring for 30min, the dissolved 2-formazol Pour the methanol solution of imidazole into the methanol solution of zinc nitrate hexahydrate, stir for 5 hours, filter and dry to obtain ZIF-8; carbonize ZIF-8 in a tube furnace, from room temperature to 800 °C, 5 °C / min heating rate, heat preservation 3h, after cooling down, the microporous carbon material MC is obtained;

[0045] (2) The microporous carbon material MC and elemental sulfur are added to carbon disulfide in a mass ratio of 85:15, the ultrasonic power is 99kHz, and the time is 30min. After mixing evenly, a mixed material is obtained;

[0046] (3) Place the mixed raw material obtained in s...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a method for high-current density fast filling of microporous sulfur in the lithium-sulfur battery. The method comprises the following steps of adding a microporous control material and elemental sulfur to carbon disulfide and carrying out uniform ultrasonic mixing to obtain a mixed material; drying the mixed material, evaporating the carbon disulfide and then obtaining a carbon-sulfur mixture of the microporous control material and the elemental sulfur; and preparing the battery by using the carbon-sulfur mixture, charging and discharging the battery for a certain number of turns at high current density and changing annular elemental sulfur into sulfur in a short-chain state to enter pores of the microporous control material. The method provided by the invention is simple in operation; the lithium-sulfur battery can be fast prepared; the cycling stability of the battery is more effectively improved after the lithium-sulfur battery is charged and discharged at relatively high current density; and the lithium-sulfur battery is closer to industrial application.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a method for rapidly filling microporous sulfur with high current density in lithium-sulfur batteries. Background technique [0002] The development of lithium batteries has received more and more attention, and increasing the capacity of lithium batteries is the key to high-end electronic products. Lithium-sulfur battery is a kind of lithium-ion battery, which uses sulfur as the positive electrode material of lithium battery. Lithium-sulfur battery can get a lot of research because of its high specific capacity (1673mAh / g) and specific energy (2600Whkg -1 ), which is 5 to 10 times the capacity of lithium-ion batteries. In nature, sulfur is very abundant, and it is environmentally friendly as a positive electrode material for batteries. However, lithium-sulfur batteries also face many technical difficulties. First, the conductivity of elemental su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/44H01M10/0525
CPCH01M4/364H01M4/38H01M4/583H01M4/625H01M10/0525H01M10/44Y02E60/10
Inventor 苏宝连蔡昌吴攀李彦辉陈丽华邓兆李昱
Owner WUHAN UNIV OF TECH