Positive electrode material for potassium ion battery and preparation method thereof, and potassium ion battery

A battery positive electrode and positive electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as climate warming, resource depletion, obstacles, etc., and achieve simple process, low raw material cost, and maintain structural stability Effect

Active Publication Date: 2017-10-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are three prominent problems in the development and utilization of traditional fossil energy such as coal, oil, and natural gas: resource depletion, climate warming, and environmental pollution.
At present, a large number of carbon materials have been reported as anode materials for potassium ion batteries (Carbon electrodes for K-ion batteries, 137(2015) 11566-11569), however, due to the large ionic radius of potassium ions However, it hinders the application of traditional intercalated layered materials in the positive electrode materials of potassium ion batteries.

Method used

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  • Positive electrode material for potassium ion battery and preparation method thereof, and potassium ion battery
  • Positive electrode material for potassium ion battery and preparation method thereof, and potassium ion battery
  • Positive electrode material for potassium ion battery and preparation method thereof, and potassium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0037] 1) Weigh potassium ferricyanide and ferrous chloride at a molar ratio of 1:1, disperse them in deionized water, and stir at 30°C for 30 minutes to form a uniform solution;

[0038] 2) Transfer the solution prepared in step 1) to a polytetrafluoroethylene liner, seal it in a reaction kettle, and conduct a hydrothermal reaction at 80° C. for 12 hours;

[0039] 3) After the reaction, the precipitate in the product is separated by a high-speed centrifuge, washed with deionized water for more than 3 times, and then vacuum-dried at a pressure of 20kPa and a temperature of 60°C for 12h to obtain the positive electrode material iron for potassium ion batteries. Potassium ferrous cyanide KFe 2+ [Fe 3+ (EN) 6 ].

[0040] Potassium ferricyanide potassium ferricyanide KFe, the positive electrode material of potassium ion battery prepared by embodiment 1 2+ [Fe 3+ (EN) 6 ] and acetylene black conductive agent, PVDF (polyvinylidene fluoride) binder according to the mass ratio o...

Embodiment 2

[0046] 1) Weigh potassium ferrocyanide and ferrous nitrate at a molar ratio of 1:1, disperse them in absolute ethanol, and stir at 60°C for 20 minutes to form a uniform solution;

[0047] 2) Transfer the solution prepared in step 1) to a polytetrafluoroethylene liner, seal it in a reaction kettle, and conduct a hydrothermal reaction at 60° C. for 15 hours;

[0048] 3) After the reaction, the precipitate in the product was separated by vacuum filtration, washed with absolute ethanol for more than 3 times, and then vacuum-dried at a pressure of 10kPa and a temperature of 50°C for 15h to obtain the sub- Potassium ferricyanide K 2 Fe 2+ [Fe 2+ (EN) 6 ].

[0049] Potassium ion battery positive electrode material potassium ferrocyanide K that embodiment 2 makes 2 Fe 2+ [Fe 2+ (EN) 6 ] The process of preparing the positive electrode sheet and assembling the button cell is the same as in Example 1.

[0050] Figure 5 Potassium ferrocyanide potassium ferrocyanide for the pota...

Embodiment 3

[0054] 1) Weigh potassium ferrocyanide and nickel nitrate at a molar ratio of 1:1, disperse them in deionized water, and stir at 25°C for 60 minutes to form a uniform solution;

[0055] 2) Transfer the solution prepared in step 1) to a polytetrafluoroethylene liner, seal it in a reaction kettle, and conduct a hydrothermal reaction at 70° C. for 12 hours;

[0056] 3) After the reaction is over, the precipitate in the product is separated by a high-speed centrifuge, washed with deionized water for more than 3 times, and then vacuum-dried for 10 hours at a pressure of 20kPa and a temperature of 80°C to obtain sub- Potassium Nickel Ferricyanide K 2 Ni 2+ [Fe 2+ (EN) 6 ].

[0057] Potassium ion battery positive electrode material potassium ferrocyanide K that embodiment 3 makes 2 Ni 2+ [Fe 2+ (EN) 6 ] The process of preparing the positive electrode sheet and assembling the button cell is the same as in Example 1.

[0058] Figure 8 Potassium nickel ferrocyanide K for the ...

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Abstract

The invention discloses a positive electrode material for a potassium ion battery and a preparation method thereof, and the potassium ion battery. The positive electrode material has a chemical formula of K<x>P[R(CN)<6>], wherein x is no less than 0 and no more than 2, P is a transition metal ion, and R is Fe<2+> or Fe<3+>. The preparation method comprises the following steps: dissolving potassium ferricyanide or potassium ferrocyanide and a transition metal salt to prepare a uniform solution; then carrying out a hydrothermal reaction; separating a precipitate produced in the hydrothermal reaction; and carrying out washing and vacuum drying so as to obtain the positive electrode material. The preparation method in the invention is simple in process, easy to operate, low in cost for required raw materials and suitable for large-scale industrial production. The prepared positive electrode material has an open three-dimensional network frame structure, and great interstitial sites allow potassium ions to shuttle and to be stored, so the potassium ion battery assembled from the positive electrode material has high discharge capacity, long cycle life, and high energy density and power density.

Description

technical field [0001] The invention belongs to the technical field of potassium ion batteries, and in particular relates to a positive electrode material of a potassium ion battery, a preparation method thereof, and a potassium ion battery assembled with the positive electrode material of the potassium ion battery. Background technique [0002] With the continuous development of the economy and the continuous progress of science and technology, the demand for energy is gradually increasing. However, there are three prominent problems in the development and utilization of traditional fossil energy such as coal, oil, and natural gas: resource depletion, climate warming, and environmental pollution. The development of renewable energy such as solar energy, wind energy and tidal energy is an inevitable trend to solve the outstanding problems faced by non-renewable energy and ensure the sustainable development of human beings. However, these renewable energy sources are highly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/12H01M4/58H01M10/054
CPCC01C3/12C01P2002/72C01P2006/17C01P2006/40H01M4/58H01M10/054Y02E60/10
Inventor 柳永宁崇少坤陈元振
Owner XI AN JIAOTONG UNIV
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