Prussian blue flower-like nano-structure material as well as preparation and application thereof

Abstract

The invention relates to a preparation method of a Prussian blue flower-like nano-structure electrode material. The preparation method comprises the following steps: 1) firstly, dissolving nickel chloride hexahydrate and anhydrous sodium citrate into de-ionized water; 2) dissolving sodium ferrocyanide decahydrate into de-ionized water; 3) pouring a solution of step 2) into a mixed solution obtained by step 1) and uniformly stirring to obtain a mixed solution; 4) standing the mixed solution obtained by step 3); 5) centrifuging and collecting sediment; washing the sediment for several times; drying in vacuum to obtain Prussian blue precursor powder; 6) adding the precursor powder into a sodium hydroxide solution and carrying out ultrasonic treatment; 7) centrifuging and collecting a product and washing; drying in vacuum to obtain light green powder, namely the Prussian blue flower-like nano-structure electrode material. The preparation method provided by the invention has the beneficial effects that the specific surface area is remarkably enlarged so that reaction sites of electrolyte and the electrode material are effectively increased and an ion diffusion distance is reduced; when the Prussian blue flower-like nano-structure electrode material is used as a positive electrode active material of a sodium ion battery, the material has the characteristics of high power and good cycling stability.

Description

technical field

[0001] The invention belongs to the technical field of nanomaterials and electrochemistry, in particular to a kind of Prussian blue (Na 1.11 NiFe(CN) 6 ) A method for preparing an electrode material with a nanoflower structure, the material can be used as a positive electrode active material for a long-life sodium ion battery. Background technique

[0002] With the development of new energy sources and the promotion of smart grid systems, lithium-ion batteries have been widely used due to their advantages such as high energy density and low self-discharge rate. However, the cost increase caused by the shortage of lithium resources has become a major problem restricting its development. In order to meet the current needs of large-scale energy storage and transportation, a Na-ion battery based on Na-ion intercalation / deintercalation has attracted widespread attention. However, due to sodium ions The large size of the electrode leads to a huge stress and st...

Examples

Embodiment 1

[0030] Prussian Blue (Na 1.11 NiFe(CN) 6 ) The preparation method of nano flower structure electrode material, it comprises the following steps:

[0031] 1) First take 4mmol nickel chloride hexahydrate (NiCl 6H 2 O) and 20mmol anhydrous sodium citrate (Na 3 C 6 h 5 o 7 ) was dissolved in 250mL deionized water;

[0032] 2) Take 5mmol sodium ferrocyanide decahydrate (Na 4 Fe(CN) 6 10H 2 O) be dissolved in another 250mL deionized water;

[0033] 3) Pour the solution obtained in step 2) into the mixture of nickel chloride and sodium citrate obtained in step 1) and stir at room temperature for 5 minutes;

[0034] 4) The mixed solution obtained in step 3) was left to stand at 25°C for 48 hours;

[0035] 5) The precipitate was collected by centrifugation, washed three times with water and absolute ethanol, and dried in vacuum at 80°C for 24 hours to obtain the precursor powder;

[0036] 6) Dissolve 16mmol of sodium hydroxide in 40mL of deionized water;

[0037] 7) Add 10...

Embodiment 2

[0044] 1) First take 3mmol nickel chloride hexahydrate (NiCl 6H 2 O) and 20mmol anhydrous sodium citrate (Na 3 C 6 h 5 o 7 ) was dissolved in 250mL deionized water;

[0045] 2) Take 5mmol sodium ferrocyanide decahydrate (Na 4 Fe(CN) 6 10H 2 O) be dissolved in another 250mL deionized water;

[0046] 3) Pour the solution obtained in step 2) into the mixture of nickel chloride and sodium citrate obtained in step 1), and stir at room temperature for 5 minutes;

[0047] 4) The mixed solution obtained in step 3) was left to stand at 25°C for 48 hours;

[0048] 5) The precipitate was collected by centrifugation, washed three times with water and absolute ethanol, and dried in vacuum at 80°C for 24 hours to obtain the precursor powder;

[0049] 6) Dissolve 16mmol of sodium hydroxide in 40mL of deionized water;

[0050] 7) Add 100mg of precursor powder into sodium hydroxide solution and ultrasonicate for 6h;

[0051] 8) The product was collected by centrifugation, washed thr...

Embodiment 3

[0054] 1) First take 4mmol nickel chloride hexahydrate (NiCl 6H 2 O) and 20mmol anhydrous sodium citrate (Na 3 C 6 h 5 o 7 ) was dissolved in 250mL deionized water;

[0055] 2) Take 5mmol sodium ferrocyanide decahydrate (Na 4 Fe(CN) 6 10H 2 O) be dissolved in another 200mL deionized water;

[0056] 3) Pour the solution obtained in step 2) into the mixture of nickel chloride and sodium citrate obtained in step 1), and stir at room temperature for 5 minutes;

[0057] 4) The mixed solution obtained in step 3) was left to stand at 25°C for 48 hours;

[0058] 5) The precipitate was collected by centrifugation, washed three times with water and absolute ethanol, and dried in vacuum at 80°C for 24 hours to obtain the precursor powder;

[0059] 6) Dissolve 16mmol of sodium hydroxide in 40mL of deionized water;

[0060] 7) Add 100mg of precursor powder into sodium hydroxide solution and ultrasonicate for 6h;

[0061] 8) The product was collected by centrifugation, washed thr...

technical field

[0001] The invention belongs to the technical field of nanomaterials and electrochemistry, in particular to a kind of Prussian blue (Na 1.11 NiFe(CN) 6 ) A method for preparing an electrode material with a nanoflower structure, the material can be used as a positive electrode active material for a long-life sodium ion battery. Background technique

[0002] With the development of new energy sources and the promotion of smart grid systems, lithium-ion batteries have been widely used due to their advantages such as high energy density and low self-discharge rate. However, the cost increase caused by the shortage of lithium resources has become a major problem restricting its development. In order to meet the current needs of large-scale energy storage and transportation, a Na-ion battery based on Na-ion intercalation / deintercalation has attracted widespread attention. However, due to sodium ions The large size of the electrode leads to a huge stress and st...

Examples

Embodiment 1

[0030] Prussian Blue (Na 1.11 NiFe(CN) 6 ) The preparation method of nano flower structure electrode material, it comprises the following steps:

[0031] 1) First take 4mmol nickel chloride hexahydrate (NiCl 6H 2 O) and 20mmol anhydrous sodium citrate (Na 3 C 6 h 5 o 7 ) was dissolved in 250mL deionized water;

[0032] 2) Take 5mmol sodium ferrocyanide decahydrate (Na 4 Fe(CN) 6 10H 2 O) be dissolved in another 250mL deionized water;

[0033] 3) Pour the solution obtained in step 2) into the mixture of nickel chloride and sodium citrate obtained in step 1) and stir at room temperature for 5 minutes;

[0034] 4) The mixed solution obtained in step 3) was left to stand at 25°C for 48 hours;

[0035] 5) The precipitate was collected by centrifugation, washed three times with water and absolute ethanol, and dried in vacuum at 80°C for 24 hours to obtain the precursor powder;

[0036] 6) Dissolve 16mmol of sodium hydroxide in 40mL of deionized water;

[0037] 7) Add 10...

Embodiment 2

[0044] 1) First take 3mmol nickel chloride hexahydrate (NiCl 6H 2 O) and 20mmol anhydrous sodium citrate (Na 3 C 6 h 5 o 7 ) was dissolved in 250mL deionized water;

[0045] 2) Take 5mmol sodium ferrocyanide decahydrate (Na 4 Fe(CN) 6 10H 2 O) be dissolved in another 250mL deionized water;

[0046] 3) Pour the solution obtained in step 2) into the mixture of nickel chloride and sodium citrate obtained in step 1), and stir at room temperature for 5 minutes;

[0047] 4) The mixed solution obtained in step 3) was left to stand at 25°C for 48 hours;

[0048] 5) The precipitate was collected by centrifugation, washed three times with water and absolute ethanol, and dried in vacuum at 80°C for 24 hours to obtain the precursor powder;

[0049] 6) Dissolve 16mmol of sodium hydroxide in 40mL of deionized water;

[0050] 7) Add 100mg of precursor powder into sodium hydroxide solution and ultrasonicate for 6h;

[0051] 8) The product was collected by centrifugation, washed thr...

Embodiment 3

[0054] 1) First take 4mmol nickel chloride hexahydrate (NiCl 6H 2 O) and 20mmol anhydrous sodium citrate (Na 3 C 6 h 5 o 7 ) was dissolved in 250mL deionized water;

[0055] 2) Take 5mmol sodium ferrocyanide decahydrate (Na 4 Fe(CN) 6 10H 2 O) be dissolved in another 200mL deionized water;

[0056] 3) Pour the solution obtained in step 2) into the mixture of nickel chloride and sodium citrate obtained in step 1), and stir at room temperature for 5 minutes;

[0057] 4) The mixed solution obtained in step 3) was left to stand at 25°C for 48 hours;

[0058] 5) The precipitate was collected by centrifugation, washed three times with water and absolute ethanol, and dried in vacuum at 80°C for 24 hours to obtain the precursor powder;

[0059] 6) Dissolve 16mmol of sodium hydroxide in 40mL of deionized water;

[0060] 7) Add 100mg of precursor powder into sodium hydroxide solution and ultrasonicate for 6h;

[0061] 8) The product was collected by centrifugation, washed thr...

Images