Preparation and application of biomass carbon coated cobalt sulfide-cobalt octasulfide composite material

A technology of composite materials and biomass carbon, applied in the direction of active material electrodes, electrochemical generators, electrical components, etc., can solve problems such as difficult to achieve high rate performance, slowness, and weakened power density

Active Publication Date: 2019-11-22
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slow kinetics of sodium ions make it difficult to achieve high rate performance, thus impairing the power density

Method used

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  • Preparation and application of biomass carbon coated cobalt sulfide-cobalt octasulfide composite material
  • Preparation and application of biomass carbon coated cobalt sulfide-cobalt octasulfide composite material
  • Preparation and application of biomass carbon coated cobalt sulfide-cobalt octasulfide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Disperse 0.8 g of cobalt chloride hexahydrate and 2.0 g of thioacetamide in 50 mL of distilled water, then add 2.0 g of gum arabic to the above solution and stir vigorously until the solution is clear, then place it in polytetrafluoroethylene Lined with a stainless steel reactor, reacted at 200°C for 12 h, cooled to room temperature, washed with deionized water and ethanol, and dried in an oven at 80°C to obtain the precursor product; then the precursor product was placed in a quartz tube protected by a nitrogen atmosphere , heat-treated at 600 °C for 2 h to obtain the product CoS-Co 9 S 8 @C.

[0025] CoS-Co 9 S 8 When @C is used as the anode of lithium-ion batteries, the reversible specific capacity reaches 784.9 mAh g for the first time -1 , with a reversible specific capacity of 754.6 mAh g after 100 cycles -1 , the capacity retention rate is 96.1%; CoS-Co 9 S 8 When @C is used as the anode of Na-ion batteries, the reversible specific capacity reaches 678.4 m...

Embodiment 2

[0027] Disperse 0.8 g of cobalt sulfate and 2.0 g of thioacetamide in 50 mL of distilled water, then add 2.0 g of gum arabic to the above solution and stir vigorously until the solution is clear, then place it in a polytetrafluoroethylene liner The stainless steel reaction kettle was reacted at 200 °C for 12 h, cooled to room temperature, washed with deionized water and ethanol, and dried in an oven at 80 °C to obtain the precursor product; then the precursor product was placed in a nitrogen atmosphere protected quartz tube, at 600 °C After heat treatment for 2 h, the product CoS-Co 9 S 8@C.

[0028] CoS-Co 9 S 8 When @C is used as the anode of lithium-ion batteries, the reversible specific capacity reaches 679.4 mAh g for the first time -1 , with a reversible specific capacity of 589.8 mAh g after 100 cycles -1 , the capacity retention rate was 86.8%; CoS-Co 9 S 8 When @C is used as the anode of Na-ion batteries, the reversible specific capacity reaches 554.4 mAh g for...

Embodiment 3

[0030] Disperse 0.8 g of cobalt acetate and 2.0 g of thioacetamide in 50 mL of distilled water, then add 2.0 g of gum arabic to the above solution and stir vigorously until the solution is clear, then place it in a polytetrafluoroethylene liner The stainless steel reaction kettle was reacted at 200 °C for 12 h, cooled to room temperature, washed with deionized water and ethanol, and dried in an oven at 80 °C to obtain the precursor product; then the precursor product was placed in a nitrogen atmosphere protected quartz tube, at 600 °C Under heat treatment for 2h, the product CoS-Co was obtained 9 S 8 @C.

[0031] CoS-Co 9 S 8 When @C is used as the anode of lithium-ion batteries, the reversible specific capacity reaches 856.7 mAh g for the first time -1 , with a reversible specific capacity of 833.5 mAh g after 100 cycles -1 , the capacity retention rate is 97.3%; CoS-Co 9 S 8 When @C is used as the anode of Na-ion batteries, the reversible specific capacity reaches 712...

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Abstract

The invention discloses a preparation method of biomass carbon coated cobalt sulfide-cobalt octasulfide composite material; the preparation method comprises the following steps: by taking biomass Arabic gum as a carbon source and metal cobalt salt and thioacetamide as raw materials, carrying out hydrothermal reaction to prepare a precursor, and carrying out pyrolysis under the protection of an inert atmosphere to obtain the carbon-coated cobalt sulfide-cobalt octasulfide composite material. Experimental data shows that the carbon-coated cobalt sulfide-cobalt octasulfide composite material prepared by the invention has relatively high specific capacity and excellent cycle performance when being used as a lithium / sodium ion battery negative electrode material, and has a good application prospect when being used as the lithium / sodium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the preparation of a biomass carbon-coated cobalt sulfide-cobalt octasulfide nine-cobalt composite material, which is mainly used for negative electrode materials of lithium / sodium ion batteries, and provides experience for the development of high specific capacity battery materials. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices and electric vehicles due to their high energy density and long cycle life. Among various anode materials for Li-ion batteries, metal sulfides are considered as promising materials because of their theoretically high capacity especially cobalt sulfide (CoS (589 mAh g -1 ), CoS 2 (871 mAh g -1 ), Co 3 S 4 (702 mAh g -1 ), Co 9 S 8 (545 mAh g -1 )) etc. caused great concern. However, there are many problems in these materials in practical applications. First, capacity fading is still a key problem for sulfide-based anode materials. In o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01M10/054
CPCH01M4/366H01M4/5815H01M4/625H01M10/0525H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 周小中王武强费莎莎田继斌刘强丁娟霞祁赵一鲁鸿凯张正风刘俊才
Owner NORTHWEST NORMAL UNIVERSITY
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