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Nitrogen-enriched carbon based/sulfur composite cathode material used for lithium sulphur batteries, and preparation method thereof

A composite cathode material, lithium-sulfur battery technology, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of restricting the marketization of lithium-sulfur batteries, low coulombic efficiency of lithium-sulfur batteries, and poor conductivity of sulfur. Achieve the effect of improving coulombic efficiency and cycle performance, improving high-rate charge-discharging performance, and inhibiting dissolution

Inactive Publication Date: 2016-02-17
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium-sulfur batteries still face many challenges, including the poor conductivity of sulfur (5×10 -30 Scm -1 , 25°C), low ion diffusion coefficient, large volume change (~80%), and polysulfide dissolution. These series of problems lead to low Coulombic efficiency, poor cycle life and capacity of lithium-sulfur batteries during charge and discharge. The attenuation is serious, which restricts the further marketization of lithium-sulfur batteries

Method used

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  • Nitrogen-enriched carbon based/sulfur composite cathode material used for lithium sulphur batteries, and preparation method thereof
  • Nitrogen-enriched carbon based/sulfur composite cathode material used for lithium sulphur batteries, and preparation method thereof
  • Nitrogen-enriched carbon based/sulfur composite cathode material used for lithium sulphur batteries, and preparation method thereof

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Embodiment 1

[0024] The first step: prepare 10L of sodium carbonate aqueous solution with a mass fraction of 1%, add 100g of silkworm cocoons, cook for 30 minutes, and dry at 60°C after repeated washing to obtain silk fibroin; prepare 100ml of potassium bromide aqueous solution with a mass fraction of 60%, add 15g After the silk fibroin was shaken for 2 hours to dissolve the silk fibroin, a dialysis bag with a molecular weight of 14,000 was used for 64 hours of dialysis to obtain an aqueous silk fibroin solution.

[0025] Step 2: Take 100ml of the above silk fibroin solution, add potassium hydroxide to make the mass concentration of potassium hydroxide 2.5%, stir for 120 minutes, freeze-dry, transfer the above mixture to a tube furnace, and keep it warm at 800°C for 3 hours under an argon atmosphere. Hours (heating rate 5°C / min), the product is washed with water until neutral and then dried (the absolute vacuum degree of vacuum drying is 100Pa, the drying temperature is 100°C, and the dryin...

Embodiment 2

[0029]Step 1: prepare 10L of sodium carbonate aqueous solution with a mass fraction of 1%, add 100g of silkworm cocoons, cook for 30 minutes, dry at 60°C to obtain silk fibroin after repeated washing; prepare 100ml of a 20% zinc chloride aqueous solution, add 15g After the silk fibroin was shaken for 2 hours to dissolve the silk fibroin, a dialysis bag with a molecular weight of 3000 was used for 36 hours to obtain an aqueous silk fibroin solution.

[0030] Step 2: Take 100ml of the above silk fibroin solution, add potassium hydroxide to make the mass concentration of potassium hydroxide 0.1%, stir for 30 minutes, freeze-dry, transfer the above mixture to a tube furnace, and keep it warm at 600°C for 5 minutes under an argon atmosphere. Hours (heating rate 5°C / min), the product is washed with water until neutral and then dried (the absolute vacuum degree of vacuum drying is 100Pa, the drying temperature is 100°C, and the drying time is 12 hours. The silk prepared by this method...

Embodiment 3

[0034] The first step: prepare 10L of sodium carbonate aqueous solution with a mass fraction of 1%, add 100g of silkworm cocoons, cook for 30 minutes, and dry at 60°C after repeated washing to obtain silk fibroin; prepare 100ml of potassium bromide aqueous solution with a mass fraction of 60%, add 10g After the silk fibroin was shaken for 2 hours to dissolve the silk fibroin, a dialysis bag with a molecular weight of 12,000 was used for dialysis for 24 hours to obtain an aqueous silk fibroin solution.

[0035] Step 2: Take 100ml of the above silk fibroin solution, add sodium hydroxide to make the mass concentration of sodium hydroxide 10%, stir for 60 minutes, freeze-dry, transfer the above mixture to a tube furnace, and keep it warm at 1200°C for 1 hour under a nitrogen atmosphere (heating rate 5°C / min), the product can be washed with water until neutral and then dried (the absolute vacuum degree of vacuum drying is 100Pa, the drying temperature is 60°C, and the drying time is...

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Abstract

The invention discloses a nitrogen-enriched carbon base / sulfur composite cathode material used for lithium sulphur batteries, and a preparation method thereof, and belongs to the field of new generation energy storage. The nitrogen-enriched carbon-based / sulfur composite cathode material comprises a nitrogen-enriched porous carbon-based carrier prepared by taking fibroin as a nitrogen-rich carbon source, and a conductive network, possesses large specific surface area, high porosity, and excellent electrical conductivity; the nitrogen-enriched porous carbon-based carrier is activated with potassium hydroxide; and the nitrogen-enriched carbon base / sulfur composite cathode material is prepared via holt melting sulfur filling. The preparation method is simple, is friendly to the environment, and is suitable for industrialized production; the nitrogen-enriched carbon base / sulfur composite cathode material used for lithium sulphur batteries possesses high energy density, excellent cycling performance, and excellent rate capability, and possesses wide application prospect in the fields such as mobile communication and portable digital products, electric automobiles, and energy storage devices.

Description

technical field [0001] The invention belongs to the field of new-generation energy storage, and specifically relates to a long-life, high-specific-capacity nitrogen-rich carbon-based / sulfur composite cathode material and a preparation method thereof. Background technique [0002] With the rapid development of portable electronic devices such as mobile communications, electronic instruments and electric tools, and the improvement of people's awareness of energy conservation and environmental protection, secondary batteries that can be charged and discharged many times have been widely used. Among numerous energy storage devices, rechargeable lithium-ion batteries still occupy the most important commercial market. However, in the fields of electric vehicles, aerospace, and national defense equipment, the current commercial lithium-ion secondary batteries are limited by their theoretical capacity, and their energy density cannot be further significantly improved, which is far f...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/64H01M4/139
CPCH01M4/139H01M4/362H01M4/38H01M4/663Y02E60/10
Inventor 蔡玉荣张佳卫姚菊明
Owner ZHEJIANG SCI-TECH UNIV
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