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Dicobalt phosphide/carbon composite material, preparation method and use thereof

A carbon composite material, carbon material technology, applied in nanotechnology for materials and surface science, secondary batteries, electrochemical generators, etc. The effect of improving cycle stability and alleviating volume change

Active Publication Date: 2019-05-17
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the preparation cost of this solution is relatively low, its products cannot be used for battery pole pieces and can only be used as catalysts

Method used

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  • Dicobalt phosphide/carbon composite material, preparation method and use thereof
  • Dicobalt phosphide/carbon composite material, preparation method and use thereof
  • Dicobalt phosphide/carbon composite material, preparation method and use thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0072] This embodiment prepares Co according to the following method 2 P / C composite material:

[0073] (1) 0.6112g of Co(NO 3 ) 2 ·6H 2 O, 0.3577g of red phosphorus and 0.05g of CTAB surfactant were added to 35mL of deionized water, and magnetically stirred. The obtained suspension was transferred into a 50 mL Teflon-lined stainless steel autoclave, placed in an oven at 210°C, and reacted for 48 hours to obtain Co 2 P precursor. Then wash twice with 3mol / L hydrochloric acid, then wash several times with deionized water and alcohol, and dry in a drying oven.

[0074] Among them, Co(NO 3 ) 2 ·6H 2 The molar ratio of O to red phosphorus is about 1:5.5, and the concentration of surfactant (CTAB) in the suspension system for hydrothermal reaction is 1.43g / L.

[0075] (2) Then take 1g of dry Co 2 The P precursor was added to a 0.048mol / L glucose solution, then transferred to a 50mL Teflon-lined stainless steel autoclave, placed in an oven at 180°C, and reacted for 3 hours...

Embodiment 2

[0085] This embodiment prepares Co according to the following method 2 P / C composite material:

[0086] (1) 0.6112g of Co(NO 3 ) 2 ·6H 2 O, 0.2927g of red phosphorus and 0.1g of CTAB surfactant were added to 35mL of deionized water, and magnetically stirred. The resulting suspension was transferred to a 50 mL Teflon-lined stainless steel autoclave, placed in an oven at 150 ° C, and reacted for 60 h to obtain Co 2 P precursor. Then wash twice with 2mol / L hydrochloric acid, then wash several times with deionized water and alcohol, and dry in a drying oven.

[0087] Among them, Co(NO 3 ) 2 ·6H 2 The molar ratio of O to red phosphorus was 1:4.5, and the concentration of surfactant (CTAB) in the suspension system for hydrothermal reaction was 2.85g / L.

[0088] (2) Then take 1g of dry Co 2 The P precursor was added to a 0.04mol / L glucose solution, then transferred to a 50mL Teflon-lined stainless steel autoclave, placed in an oven at 190°C, and reacted for 4 hours to obtai...

Embodiment 3

[0095] This embodiment prepares Co according to the following method 2 P / C composite material:

[0096] (1) 0.6112g of Co(NO 3 ) 2 ·6H 2 O, 0.3902g of red phosphorus and 0.15g of SDBS surfactant were added to 35mL of deionized water, and magnetically stirred. The obtained suspension was transferred to a 50 mL Teflon-lined stainless steel autoclave, placed in an oven at 220 ° C, and reacted for 30 h to obtain Co 2 P precursor. Then wash twice with 1mol / L hydrochloric acid, then wash several times with deionized water and alcohol, and dry in a drying oven.

[0097] Among them, Co(NO 3 ) 2 ·6H 2 The molar ratio of O to red phosphorus was 1:6, and the concentration of surfactant (SDBS) in the suspension system for hydrothermal reaction was 4.29g / L.

[0098] (2) Then take 1g of dry Co 2 The P precursor was added to a 0.08mol / L glucose solution, then transferred to a 50mL Teflon-lined stainless steel autoclave, placed in an oven at 200°C, and reacted for 2 hours to obtain ...

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Abstract

The invention provides a dicobalt phosphide / carbon composite material, a preparation method thereof and use thereof. The dicobalt phosphide / carbon composite material provided by the invention comprises a carbon material substrate and a Co2P nanosheet embedded in the carbon material substrate. The preparation method comprises the following steps of (1) performing a hydrothermal reaction after mixing a cobalt source, a phosphorus source and a surfactant with water to obtain a Co2P precursor; (2) performing a hydrothermal reaction after mixing the Co2P precursor with an organic carbon source solution to obtain a Co2P / C composite material precursor; and (3) calcining the Co2P / C composite material precursor under a protective atmosphere to obtain the dicobalt phosphide / carbon composite material. The dicobalt phosphide / carbon composite material provided by the invention has good conductivity, high specific capacity, good rate performance and cycle performance. The preparation method providedby the invention has the advantages that the raw materials are cheap and easy to obtain, the preparation process is simple and the operation controllability is high.

Description

technical field [0001] The invention belongs to the field of new energy materials and relates to an electrode material, in particular to a cobalt dicobalt phosphide / carbon composite material and its preparation method and application. Background technique [0002] Due to the advantages of high energy density, light weight, small size, good cycle performance, environmental friendliness and no memory effect, lithium-ion batteries are widely used in various fields such as electronic products, electric vehicles and large-scale energy storage. However, the lack and uneven distribution of lithium resources in the earth's crust are not enough to meet the growing demand for lithium-ion batteries, which seriously restricts the large-scale application of lithium-ion batteries. Therefore, the development of new secondary batteries with abundant resources, low cost and excellent performance has become a new development trend and research hotspot in the field of battery materials. [00...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCY02E60/10
Inventor 罗绍华黄红波刘彩玲闫绳学冯建王志远王庆张亚辉刘延国赵鑫郝爱民刘忻刘宣文郭瑞伊廷锋王亚峰
Owner 东北大学秦皇岛分校
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