Potassium ion battery positive electrode material and preparation method thereof, and potassium-iodine battery

A battery positive electrode and positive electrode material technology, applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of battery energy density increase, etc., and achieve the effect of broad application prospects

Active Publication Date: 2018-08-31
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The performance of the battery mainly depends on the performance of the electrode material, and the capacity of the existing potassium ion battery cathode material can no longer meet the needs of practical applications, which limits the further increase of the energy density of the battery

Method used

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  • Potassium ion battery positive electrode material and preparation method thereof, and potassium-iodine battery
  • Potassium ion battery positive electrode material and preparation method thereof, and potassium-iodine battery
  • Potassium ion battery positive electrode material and preparation method thereof, and potassium-iodine battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The preparation process of potassium iodine battery is as follows:

[0052] 1) Preparation of porous carbon cloth: immerse the commercial carbon cloth in 50mL KOH ethanol solution, the mass of KOH contained in the ethanol solution is the same as that of the added carbon cloth, and stir until dry at 80°C; Calcined at 700°C for one hour in a quartz tube furnace filled with inert gas, then washed repeatedly, and dried the porous carbon cloth.

[0053] 2) Iodine-carbon is compounded by simple solution adsorption and internal packaging. The specific process is: dissolve 10mg iodine element in 20mL water. Since the solubility of iodine element in water is very low, there are many fine particles of iodine element in the solution. At this time, the porous carbon cloth is immersed in the above solution for a certain period of time, so that the iodine in the solution is absorbed by the carbon in the porous carbon cloth and encapsulated in the internal pores. Finally, the solution...

Embodiment 2

[0059] A positive electrode material for a potassium ion battery, the positive electrode material includes a porous carbon carrier and iodine elemental substance loaded on the porous carbon carrier, the interior of the porous carbon carrier is provided with micropores and mesopores, and the iodine elemental substance is adsorbed and filled in the mesopores of the porous carbon carrier and inside the pores.

[0060] Among them, in the porous carbon carrier, the pore diameter of the mesopore is 4.4nm, and the pore diameter of the micropore is 2nm; in the positive electrode material, the mass percentage of iodine is 29%.

[0061] The preparation method of the positive electrode material of the potassium ion battery comprises the following steps:

[0062] 1) The porous carbon carrier is prepared by alkali etching pore-forming method, specifically:

[0063] 1-1) Submerge the carbon support in an ethanol solution of KOH, and stir until dry at 90°C;

[0064] 1-2) Calcining the carbon...

Embodiment 3

[0071] A positive electrode material for a potassium ion battery, the positive electrode material includes a porous carbon carrier and iodine elemental substance loaded on the porous carbon carrier, the interior of the porous carbon carrier is provided with micropores and mesopores, and the iodine elemental substance is adsorbed and filled in the mesopores of the porous carbon carrier and inside the pores.

[0072] Wherein, in the porous carbon carrier, the pore diameter of the mesopore is 2nm, and the pore diameter of the micropore is 1.2nm; in the positive electrode material, the mass percentage of iodine is 44%.

[0073] The preparation method of the positive electrode material of the potassium ion battery comprises the following steps:

[0074] 1) The porous carbon carrier is prepared by alkali etching pore-forming method, specifically:

[0075] 1-1) Submerge the carbon support in an ethanol solution of KOH, and stir until dry at 70°C;

[0076] 1-2) Calcining the carbon ...

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Abstract

The invention relates to a potassium ion battery positive electrode material and a preparation method thereof, and a potassium-iodine battery. The positive electrode material comprises a porous carboncarrier and an iodine elementary substance loaded on the porous carbon carrier. The porous carbon carrier is internally provided with micropores and mesopores, and the iodine elementary substance isabsorbed and filled into the mesopores and micropores of the porous carbon carrier. During preparation, the porous carbon carrier is prepared by an alkali-etching and pore-forming method, and then theiodine elementary substance is loaded on the porous carbon carrier by an impregnation method. The potassium-iodine battery comprises a positive electrode, a negative electrode and an electrolyte solution; the positive electrode is made of a potassium ion battery positive electrode material, and the negative electrode is made of potassium. Compared with the prior art, the self-supporting porous carbon carrier is used as a substrate, and high-quality loading of the active component iodine elementary substance is realized by the simple solution impregnation method, and the potassium ion batterypositive electrode material loaded with the iodine elementary substance is prepared, is used for assembling the high-capacity potassium-iodine battery with high energy density and excellent cycling stability and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of potassium ion batteries, and relates to a positive electrode material of a potassium ion battery, a preparation method thereof, and a potassium iodine battery. Background technique [0002] Since the advent of lithium-ion batteries in the 1990s, they have been widely used as mobile phones, laptops and other electronic devices and environmentally friendly electric vehicles due to their advantages of high energy density, good cycle performance and strong charge retention. At the same time, it has become a green secondary battery that the world is competing to develop. With the development of technologies such as electric vehicles, there is an increasing demand for new high-capacity unit batteries. Limited by the limitation of lithium metal resources (the abundance in the crust is 0.0017wt.%), sodium ions and potassium ions (the abundances of sodium and potassium in the crust are 2.3wt.%, 1.5wt.%), etc. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/054
CPCH01M4/366H01M4/388H01M4/625H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 罗巍黄云辉鹿可
Owner TONGJI UNIV
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