Potassium/prussian blue secondary battery

A Prussian blue, secondary battery technology, applied in the field of electrochemistry, can solve the problems of large potassium ion radius and achieve good electrochemical performance

Inactive Publication Date: 2017-06-30
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the radius of potassium ions is large, and it is challenging to find a framework material that can reversibly intercalate and deintercalate potassium ions with stable results.

Method used

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  • Potassium/prussian blue secondary battery
  • Potassium/prussian blue secondary battery
  • Potassium/prussian blue secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take FeFe(CN) 6 The powder is mixed with the conductive agent carbon fiber (VGCF) and the binder polyvinylidene fluoride (PVDF) at a mass ratio of 8:1:1, and N-methyl-2-pyrrolidone (NMP) is used as a solvent to form a slurry and evenly coated Clothed on the current collector Al foil, and then dried in a vacuum oven at 60 °C for 24 h, ready for use. With metal potassium sheet as the negative electrode, FeFe(CN) 6 Positive electrode, Celgrad 2325 as separator, 0.5mol L -1 Potassium hexafluorophosphate (KPF 6 ) / Ethylene Carbonate (EC): Dimethyl Carbonate (DEC) is used as the electrolyte to assemble the battery.

[0023] figure 1 .FeFe(CN) 6 and KFeFe(CN) 6 The powder X-ray diffraction pattern of the present example shows that the two Prussian blue electrode materials in this example are cubic crystals, belong to the Fm-3m space group, and there is no impurity in the two samples.

[0024] FeFe(CN) 6 The electrode material is charged and discharged at a current of 1...

Embodiment 2

[0027] Take KFeFe(CN) 6 The powder is mixed with the conductive agent carbon fiber (VGCF) and the binder polyvinylidene fluoride (PVDF) at a mass ratio of 8:1:1, and N-methyl-2-pyrrolidone (NMP) is used as a solvent to form a slurry and evenly coated Clothed on the current collector Al foil, and then dried in a vacuum oven at 60 °C for 24 h, ready for use. With metal potassium sheet as the negative electrode, KFeFe(CN) 6 Pole piece is the positive electrode, Celgrad2325 is the diaphragm, 0.5mol L -1 Potassium hexafluorophosphate (KPF 6 ) / Ethylene Carbonate (EC): Dimethyl Carbonate (DEC) is used as the electrolyte to assemble the battery.

[0028] The battery was charged and discharged at a current density of 100 mA / g, and the voltage range was 2.0-4.0 V.

[0029] image 3 , the charge-discharge curve and cycle performance diagram of KFeFe(CN) material show that the discharge / charge platform of the modified material is 3.4 and 3.5 V respectively, showing a small charge-dis...

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Abstract

The invention belongs to the technical field of potassium ion batteries and in particular relates to a potassium/prussian blue secondary battery. The battery is a battery system composed of a prussian blue anode, a metal potassium sheet cathode, an organic electrolyte and a diaphragm. A FeFe(CN)6 electrode material is used for the potassium ion battery, wherein the specific capacity can reach 124mAh/g, the voltage platform is 3.5V, and the energy density can reach 434Wh/kg. The material shows excellent rate capability and circulating stability, and provides a good experimental basis for development of potassium secondary battery anode materials.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a potassium / Prussian blue secondary battery. Background technique [0002] How to optimize the utilization of renewable energy sources such as wind and solar. This issue has become the focus of global attention. The solution is to store renewable energy using low-cost and environmentally friendly rechargeable batteries. Large-scale energy storage requires large chemical power sources, and lithium-ion batteries, which have made great progress, are no longer ideal for these applications. Because lithium reserves in the earth's crust are low, which leads to high prices. In contrast, the content of potassium in the earth's crust is about 350 times that of lithium, and potassium has similar physical and chemical properties to lithium, so potassium-ion batteries will have great potential as batteries for large-scale energy storage applications. Advantage. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/38H01M10/38
CPCH01M4/381H01M4/58H01M10/38Y02E60/10Y02P70/50
Inventor 祖丽皮亚·沙地克傅正文
Owner FUDAN UNIV
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