Prussian blue analogous positive material for sodium-ion batteries and preparation method of positive material

A technology for sodium ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of poor cycle performance and low capacity, achieve preparation methods and are easy to control, high capacity, and materials The effect of stable performance

Inactive Publication Date: 2015-06-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prussian blue analogs (Na 2 NiFe(CN) 6 ) material has 65mAh g in water system battery -1 97% of the initial capacity can be maintained after 500 cycles, and 61mAh g can still be maintained at a high current density of 10C -1 capacity (Wu, X., et al., A low-cost and environmentally benign aqueous rechargeable sodium-ion battery based on NaTi 2 (PO 4 ) 3 -Na 2 NiFe(CN) 6 intercalation chemistry.Electrochemistry

Method used

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  • Prussian blue analogous positive material for sodium-ion batteries and preparation method of positive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1, liquid phase precipitation reaction

[0038] (1) Weigh 0.951g of nickel dichloride hexahydrate (NiCl 2 ·6H 2 0) add in 40mL deionized water, stir to make it dissolve, obtain nickel chloride solution concentration and be 0.1mol / L; Take by weighing 1.428g cobalt dichloride hexahydrate (CoCl 2 ·6H 2 0) add in 60mL deionized water, stir to make it dissolve, obtain cobalt chloride solution concentration and be 0.1mol / L;

[0039] (2) Weigh 4.841g of sodium ferrocyanide decahydrate (Na 4 Fe(CN) 6 10H 2 O) add in 100mL deionized water, stir to make it dissolve, obtain mother liquor concentration and be 0.1mol / L;

[0040] (3) 40mL of nickel salt solution and 60mL of cobalt salt solution were dropped into the mother liquor at the same time with a peristaltic pump to obtain a mixed solution, and the mixed solution was continuously stirred and reacted for 6 hours at room temperature and protected from light;

[0041] (4) Aging the mixed solution after stirring and re...

Embodiment 2

[0046] Step 1, liquid phase precipitation reaction

[0047] (1) Weigh 0.0951g of NiCl 2 ·6H 2 Add O into 40mL deionized water, stir to dissolve it, and obtain a nickel chloride solution with a concentration of 0.01mol / L; weigh 0.1428g of CoCl 2 ·6H 2 O was added in 60mL of deionized water, stirred and dissolved to obtain a concentration of cobalt chloride solution of 0.01mol / L;

[0048] (2) Weigh 0.4841g of Na 4 Fe(CN) 6 10H 2 O was added in 100mL of deionized water, stirred to make it dissolve, and the mother liquor concentration obtained was 0.01mol / L;

[0049] (3) 40mL of nickel salt solution and 60mL of cobalt salt solution were added dropwise to the mother liquor with a peristaltic pump at the same time to obtain a mixed solution, and the mixed solution was continuously stirred and reacted for 4 hours at room temperature and protected from light;

[0050] (4) Aging the mixed solution after stirring and reacting for 24 hours at room temperature under the condition o...

Embodiment 3

[0055] Step 1, liquid phase precipitation reaction

[0056] (1) Weigh 1.051g of nickel sulfate hexahydrate (NiSO 4 ·6H 2 0) add in 40mL deionized water, stir to make it dissolve, obtain nickel sulfate solution concentration and be 0.1mol / L; Take by weighing 1.687g cobalt sulfate heptahydrate (CoSO 4 ·7H 2 0) add in 60mL deionized water, stir to make it dissolve, obtain cobalt sulfate solution concentration and be 0.1mol / L;

[0057] (2) Weigh 4.841g of Na 4 Fe(CN) 6 10H 2 O) add in 100mL deionized water, stir to make it dissolve, obtain mother liquor concentration and be 0.1mol / L;

[0058] (3) 40mL of nickel salt solution and 60mL of cobalt salt solution were dropped into the mother liquor at the same time with a peristaltic pump to obtain a mixed solution, and the mixed solution was continuously stirred and reacted at room temperature and protected from light for 6h;

[0059] (4) Aging the mixed solution after stirring and reacting for 72 hours at room temperature under...

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Abstract

The invention relates to a Prussian blue analogous positive material for sodium-ion batteries and a preparation method of the positive material and belongs to the technical field of sodium-ion batteries. The chemical composition of the positive material is Na2Ni0.4Co0.6Fe(CN)6. The preparation method of the positive material comprises the following steps: respectively dissolving nickel salt, cobalt salt and sodium ferrocyanide in water to prepare a nickel salt solution, a cobalt salt solution and a mother solution which are same in concentration; simultaneously adding the nickel salt solution and the cobalt salt solution into the mother solution, subsequently stirring in dark places at room temperature; then ageing at the room temperature; subsequently centrifuging and carrying out solid-liquid separation, firstly washing while centrifuging, subsequently washing by using absolute ethyl alcohol, and finally drying to prepare the positive material. The positive material has a plurality of characteristics of high capacity, high cycling stability and high coulombic efficiency and serves as novel low-cost and environmentally-friendly energy storage positive material for the sodium-ion batteries; the raw materials used by the method are widely distributed in the nature, are low in cost and are environmentally-friendly; the method is simple and is liable to control; the prepared positive material is stable in performance.

Description

technical field [0001] The invention relates to a Prussian blue analog positive electrode material for a sodium ion battery and a preparation method thereof, specifically, the chemical composition of the positive electrode material is Na 2 Ni 0.4 co 0.6 Fe(CN) 6 , belongs to the technical field of sodium ion batteries. Background technique [0002] The excessive exploitation and utilization of traditional fossil energy has not only caused serious environmental pollution, but also brought about an energy crisis. Clean renewable energy, such as: wind energy, solar energy, tidal energy, etc., has become the key to solving the problem, and thus has received widespread attention. In fact, due to the periodicity and instability of these energy sources, they cannot be directly connected to the grid for human use. They can only be used after they are stored by energy storage devices. Secondary batteries are currently popular energy storage systems, among which, lithium-ion batt...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/05
CPCH01M4/60H01M10/054Y02E60/10
Inventor 陈人杰谢嫚吴锋黄永鑫徐孟豪李丽陈实管沛林
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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