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Preparation method of two-dimensional porous hexagonal metal oxide nanosheet composite material and application of the composite material in potassium ion battery

A composite material, hexagonal technology, applied in the field of preparation of two-dimensional porous hexagonal metal oxide nanosheet composite materials, can solve the problems of low conductivity, capacity decay, poor rate performance and cycle performance, etc.

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

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Problems solved by technology

However, due to the low conductivity of MnO, it has poor rate performance and cycle performance, and the severe aggregation and large volume change between MnO nanoparticles will lead to rapid capacity decay during potassiumization and depotassiation.

Method used

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  • Preparation method of two-dimensional porous hexagonal metal oxide nanosheet composite material and application of the composite material in potassium ion battery
  • Preparation method of two-dimensional porous hexagonal metal oxide nanosheet composite material and application of the composite material in potassium ion battery
  • Preparation method of two-dimensional porous hexagonal metal oxide nanosheet composite material and application of the composite material in potassium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of MnO@a-TiO 2 -Vo NHSs composite materials

[0035] Step S1: Dissolve 0.1-1g SA in 70mL 0.01-0.1mol L under stirring condition -1 Li 2 CO 3 and 0.01-0.1mol L -1 KMnO 4 Then transfer the mixed solution to a 100mL stainless steel autoclave lined with polytetrafluoroethylene for hydrothermal reaction at 120-150°C for 10-20h, and then repeatedly wash the precipitate with deionized water and ethanol by centrifugation , dried at 60 °C for 8 h to obtain MnCO 3 NHSs precursors;

[0036] Step S2: 0.1-0.8g of MnCO obtained in step S1 3 The NHSs precursor was added to a mixed solution containing 100-1000mL absolute ethanol and 0.6-3mL ammonia solution with a mass percentage of 28%, ultrasonicated for 30min and stirred at 30-50°C for 30min to obtain a uniform dispersion, and then added dropwise 1-5mL titanium isopropoxide and react at 30-50°C for 30-50h, then repeatedly wash the precipitate with ethanol by centrifugation, and dry at 80°C for 12h to obtain MnCO ...

Embodiment 2

[0042] Preparation of NiO@a-TiO 2 -Vo NHSs composite materials

[0043] Step S1: under stirring condition, mix 1-3g surfactant CTAB and 1-5mmol nickel source C 4 h 6 NiO 4 4H 2 O was added to the mixed solution of 60mL ethanol and 11mL water in turn, stirred ultrasonically for 1h to form a uniform solution, and then transferred the uniform solution to a 100mL stainless steel autoclave lined with polytetrafluoroethylene and reacted hydrothermally at 150-200°C for 20- 30h, then repeatedly washed the precipitate with deionized water by centrifugation, and dried at 80°C for 12h to obtain light green β-Ni(OH) 2 NHSs precursors;

[0044] Step S2: 0.1-0.8g of β-Ni(OH) obtained in Step S1 2The NHSs precursor was added to a mixed solution containing 100-1000mL absolute ethanol and 0.6-3mL ammonia solution with a mass percentage of 28%, ultrasonicated for 30min and stirred at 30-50°C for 30min to obtain a uniform dispersion, and then added dropwise 1-5mL titanium isopropoxide and...

Embodiment 3

[0047] Preparation of Co 3 o 4 @a-TiO 2 -Vo NHSs composite materials

[0048] Step S1: Dissolve 3-4mmol cobalt nitrate hexahydrate in a mixed solution of 30mL water and 30mL triethylene glycol under stirring conditions, then add 0.1-1g urea and obtain a uniform solution under mild stirring conditions, transfer the uniform solution In a 100mL stainless steel autoclave lined with polytetrafluoroethylene, hydrothermally react at 100-150°C for 20-30h, then repeatedly wash the precipitate with deionized water and ethanol by centrifugation, and dry at 60°C for 24h to obtain Co(CO 3 ) 0.5 (OH) x 0.11H 2 O NHSs precursors;

[0049] Step S2: 0.1-0.8g of Co(CO) obtained in Step S1 3 ) 0.5 (OH) x 0.11H 2 O NHSs precursor was added to a mixed solution containing 100-1000mL absolute ethanol and 0.6-3mL ammonia solution with a mass percentage of 28%, ultrasonicated for 30min and stirred at 30-50°C for 30min to obtain a uniform dispersion, and then dropwise Add 1-5mL titanium isop...

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Abstract

The invention discloses a preparation method of a two-dimensional porous hexagonal metal oxide nanosheet composite material and application of the composite material in a potassium ion battery, and belongs to the technical field of preparation of potassium ion battery composite negative electrode materials. Key points of the technical scheme of the method are as follows: MnO is taken as an examplefor explanation; a MnCO3 NHSs precursor is firstly prepared by utilizing a hydrothermal method; then, a hydrolysis method is used for obtaining a MnCO3@a-TiO2 NHSs intermediate product; then, calcination is performed in a weak reducing atmosphere to introduce oxygen vacancy defects into the nanometer crystals to finally prepare the MnO@a-TiO2-Vo NHSs composite material. The composite material prepared by the method shows excellent rate capability and cycle performance when being used as a negative electrode material of a potassium ion battery, so that the composite material has a relatively good application prospect in the potassium ion battery.

Description

technical field [0001] The invention belongs to the technical field of preparation of composite negative electrode materials for potassium ion batteries, and in particular relates to a preparation method of a two-dimensional porous hexagonal metal oxide nanosheet composite material and its application in potassium ion batteries. Background technique [0002] The development of low-cost, long-life, and high-energy-density battery electrode materials is considered to be an important choice for future high-performance secondary battery research. Among all kinds of secondary batteries, potassium-ion batteries have attracted more and more researchers' attention due to their advantages such as wide distribution of potassium elements and low cost. Among various anode materials for potassium ion batteries, transition metal oxides (TMOs, TMOs including Fe 2 o 3 , Fe 3 o 4 、Co 3 o 4 , MnO, SnO 2 , NiO, CuO and MoO 3 ) have attracted extensive research. Among them, MnO has rel...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/52H01M4/62H01M10/054B82Y30/00
CPCH01M4/366H01M4/502H01M4/523H01M4/624H01M4/628H01M10/054B82Y30/00H01M2004/021H01M2004/027Y02E60/10
Inventor 吕晓刘代伙白正宇杨林
Owner HENAN NORMAL UNIV
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