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In-situ carbon-coating hexagon K0.7[Fe0.5Mn0.5]O2 nano material as well as preparation method and application thereof

A nanomaterial, hexagonal technology, applied in the field of nanomaterials and electrochemistry, can solve the problems of high capacity, poor conductivity, difficult morphology, etc., and achieve good cycle stability and energy consumption. The effect of low and high discharge specific capacity

Active Publication Date: 2015-06-10
安徽国芯新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, layered transition metal oxides are difficult to obtain due to the pure phase, and their shape is difficult to nanoflowers and poor conductivity, so that it is difficult to fully exert their high capacity, so we need to use in-situ coating of conductive substances , while improving its electronic conductivity, inhibiting the secondary agglomeration of its grains and improving its electrochemical performance
Currently, in situ carbon-coated hexagonal K 0.7 [Fe 0.5 mn 0.5 ]O 2 Nanomaterials have not been reported

Method used

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  • In-situ carbon-coating hexagon K0.7[Fe0.5Mn0.5]O2 nano material as well as preparation method and application thereof
  • In-situ carbon-coating hexagon K0.7[Fe0.5Mn0.5]O2 nano material as well as preparation method and application thereof
  • In-situ carbon-coating hexagon K0.7[Fe0.5Mn0.5]O2 nano material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In-situ carbon-coated hexagon K 0.7 [Fe 0.5 Mn 0.5 ]O 2 The preparation method of nanomaterials comprises the following steps:

[0037] 1) Put 7.0mmol KNO 3 , 5.0mmol Fe(NO 3 ) 3 .9H 2 O, 5.0 mmol Mn (CH 3 COO) 2 Add 6.0 g of oxalic acid to 20 mL of deionized water, and stir at 25°C until the solution is light yellow and transparent;

[0038] 2) The solution obtained in step 1) was moved to an 80°C water bath and stirred for 4 hours to obtain a brown-red transparent solution;

[0039] 3) Transfer the solution obtained in step 2) into a petri dish, and dry it at a constant temperature of 80°C;

[0040] 4) The solid obtained in step 3) is then rapidly transferred to a high temperature of 180 ° C and baked for 12 hours to obtain a loose solid structure;

[0041] 5) grinding the product obtained in step 4), and then calcining for 3 hours at 300° C. in air;

[0042] 6) Step 5) was moved to 600, 800 and 1000 °C and calcined for 8 hours under argon conditions to ob...

Embodiment 2

[0052] 1) Put 3.5 mmol K 2 CO 3 , 2.5mmol Fe 2 (SO 4 ) 3 .9H 2 O, 2.5 mmol Mn 2 CO 3 Add 2.0 g of citric acid to 20 mL of deionized water, and stir at 25°C until the solution is light yellow and transparent;

[0053] 2) The solution obtained in step 1) was moved to a 60°C water bath and stirred for 6 hours to obtain a brown-red transparent solution;

[0054] 3) Transfer the solution obtained in step 2) into a petri dish, and dry it at a constant temperature of 60°C;

[0055] 4) The solid obtained in step 3) is then rapidly transferred to a high temperature of 120 ° C and baked for 10 hours to obtain a loose solid structure;

[0056] 5) grinding the product obtained in step 4), and then calcining at 400° C. for 3 hours in air;

[0057] 6) Move step 5) to 600°C for calcination under argon for 12 hours to obtain in-situ carbon-coated hexagon K 0.7 [Fe 0.5 Mn 0.5 ]O 2 nanomaterials.

[0058] Coating hexagon K with in-situ carbon obtained in this example 0.7 [Fe 0.5...

Embodiment 3

[0060] 1) Put 3.5mmol KNO 3 , 1.75mmol K 2 SO 4 , 2.5mmol Fe(NO 3 ) 3 .9H 2 O, 1.25mmol Fe 2 (SO 4 ) 3 .7H 2 O, 2.5 mmol Mn (CH 3 COO) 2 , 1.25mmol Mn 2 CO 3 , 2.0g of oxalic acid and 2.0g of citric acid were added to 40mL of deionized water, and stirred at 25°C until the solution was light yellow and transparent;

[0061] 2) The solution obtained in step 1) was moved to a 50°C water bath and stirred for 6 hours to obtain a brown-red transparent solution;

[0062] 3) Transfer the solution obtained in step 2) into a petri dish, and dry it at a constant temperature of 90°C;

[0063] 4) The solid obtained in step 3) is then rapidly transferred to a high temperature of 200 ° C and baked for 10 hours to obtain a loose solid structure;

[0064] 5) Grind the product obtained in step 4). Then calcined at 500°C in air for 2 hours;

[0065] 6) Move step 5) to 1000°C for calcination under argon for 10 hours to obtain in-situ carbon-coated hexagon K 0.7 [Fe 0.5 Mn 0.5 ]...

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Abstract

The invention relates to an in-situ carbon-coating hexagon K0.7[Fe0.5Mn0.5]O2 nano material as well as a preparation method and an application thereof. The material can serve as a sodium-ion battery positive active material which is formed by coating K0.7[Fe0.5Mn0.5]O2 hexagonal nano crystals with graphitized carbon layers; the diameter of the hexagonal nano crystals is 100-350nm; the thickness of the graphitized carbon layers is 6-10nm. The in-situ carbon-coating hexagon K0.7[Fe0.5Mn0.5]O2 nano material has the beneficial effects that the nano material with relatively uniform shape is finally prepared by combining methods of drying solutions and calcinating atmosphere; the material serves as a sodium-ion battery positive material active substance and shows relatively high specific discharge capacity and excellent cycling stability; on the other hand, the process is simple; the in-situ carbon-coating hexagon K0.7[Fe0.5Mn0.5]O2 nano material is prepared by simply drying and calcinating the solution; the energy consumption is relatively low.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to an in-situ carbon-coated hexagonal K 0.7 [Fe 0.5 Mn 0.5 ]O 2 Nanometer material and preparation method thereof, the material can be used as positive electrode active material of sodium ion battery. Background technique [0002] With the development of science and technology and the rapid growth of population, the consumption of energy in the new century is also increasing, and the non-renewable resources such as oil, coal and natural gas are depleted. Continuity and sustainability of energy in order to meet usage requirements. In the existing mainstream energy system, oil and coal are non-renewable energy sources, and they will also generate a large amount of CO during their use and consumption. 2 , SO 2 and other harmful substances, causing serious damage to the environment on which human beings depend. This prompts people to pay mor...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M10/05B82Y40/00
CPCY02E60/10
Inventor 麦立强王选朋孟甲申牛朝江
Owner 安徽国芯新材料有限公司
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