Calcium potassium niobate composite salt negative electrode material for potassium ion battery and preparation process of calcium potassium niobate composite salt negative electrode material

A negative electrode material, potassium ion technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low charge and discharge Coulomb efficiency, no stable charge and discharge platform, and high potential of charge and discharge platform, and achieve easy control of reaction conditions , excellent cycle stability, and simple equipment

Pending Publication Date: 2020-11-20
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of KCa for potassium ion battery 2 Nb 3 o 10 The negative electrode material and its preparation process overcome the problems of low charge-discharge coulombic efficiency, excessively high charge-discharge platform potential or no stable charge-discharge platform, and serious overpotential polarization that are generally faced by current potassium-ion battery negative electrode materials; the present invention is based on KCa 2 Nb 3 o 10 Unique layered structure, developed a perovskite niobate anode material for potassium ion batteries, which has high safety, stable charge and discharge potential platform, small overpotential polarization and high charge and discharge Coulombic efficiency and other advantages

Method used

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  • Calcium potassium niobate composite salt negative electrode material for potassium ion battery and preparation process of calcium potassium niobate composite salt negative electrode material
  • Calcium potassium niobate composite salt negative electrode material for potassium ion battery and preparation process of calcium potassium niobate composite salt negative electrode material
  • Calcium potassium niobate composite salt negative electrode material for potassium ion battery and preparation process of calcium potassium niobate composite salt negative electrode material

Examples

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Embodiment 1

[0052] This example shows a KCa 2 Nb 3 o 10 Synthesis method of negative electrode material.

[0053] (1) Accurately weigh 6.7332 g potassium hydroxide (KOH), and pour it into (25 ml) polytetrafluoroethylene hydrothermal kettle;

[0054] (2) Accurately measure 15 ml of deionized water with a graduated cylinder, and slowly drop the deionized water in the graduated cylinder into a hydrothermal kettle filled with potassium hydroxide with a dropper;

[0055] (3) Accurately weigh 299.8 mg niobium pentoxide (Nb 2 o 5 ), 111.4 mg calcium hydroxide Ca(OH) 2 , pour it into the above-mentioned hydrothermal kettle, and magnetically stir for 0.5 h;

[0056] (4) Hydrothermal reaction was carried out at 200 °C, and the reaction time was 72 h;

[0057] (5) Then cool to room temperature, turn on the hydrothermal kettle to remove the supernatant, wash with deionized water, centrifuge in a centrifuge at a speed of 4000rpm, place the centrifuged product in an ordinary oven, and dry at 80°...

Embodiment 2

[0065] This example shows a transition metal compound KCa 2 Nb 3 o 10 Potassium-ion battery with negative electrode.

[0066] The composition of the negative electrode material of the potassium ion battery (taking the mass fraction of the negative electrode material as 100%): making the negative electrode active material: conductive acetylene black: CMC binder = 7: 2: 1 (wt%: wt%: wt%), then Place the container in a vacuum stirrer and stir for 1 h, and apply the stirred slurry on the surface of the aluminum foil, so that the active material load is maintained at about 1-2 mg / cm 2 . After coating, the aluminum foil was quickly transferred to a vacuum oven at 80 °C for 12 h. Afterwards, the prepared electrode sheets were cut into small discs with a diameter of 10 mm using a punching machine, and weighed quickly to prevent the electrode sheets from absorbing moisture in the air and resulting in large weighing errors. The weighed electrode sheet was again placed in a vacuum o...

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Abstract

The invention belongs to the technical field of potassium ion battery materials, and relates to a process for preparing a KCa2Nb3O10 negative electrode material by combining a hydrothermal method anda solid-phase method and application of the KCa2Nb3O10 negative electrode material in a potassium ion battery. The process comprises the following steps of: mixing a potassium source precursor, a niobium source precursor and a calcium source precursor, and carrying out hydrothermal reaction; then carrying out centrifugal treatment; carrying out drying and then carrying out heat treatment to obtainthe KCa2Nb3O10 negative electrode material. With the negative electrode material disclosed by the invention adopted, the problems of poor cycle and rate capability, unstable charging and dischargingplateau, serious battery polarization, low charging and discharging coulombic efficiency and the like of an existing potassium ion battery negative electrode material. The KCa2Nb3O10 disclosed by theinvention is used as a transition metal compound to be applied to a negative electrode material of a potassium ion battery, and has excellent electrochemical properties such as a stable and high-safety charging and discharging voltage plateau, small battery overpotential polarization voltage and high charging and discharging coulombic efficiency.

Description

technical field [0001] The invention belongs to the technical field of potassium ion battery materials, and mainly relates to a method for preparing KCa by combining a hydrothermal method and a solid phase method. 2 Nb 3 o 10 Anode material technology and application in potassium ion batteries. Background technique [0002] Lithium-ion batteries (LIBs) have been widely used in various portable electronic products since their commercialization in 1990 due to their high energy density and superior electrochemical performance. However, the scarcity of lithium resources makes lithium batteries expensive and unsustainable, so it is necessary to develop new battery systems. Potassium resources are abundant in the earth's crust, evenly distributed, cheap and easy to obtain, and the standard electrode potential is similar to lithium, which gives potassium-ion batteries (KIBs) a good application prospect. In recent years, KIBs have gradually attracted the attention of more and mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M10/054
CPCH01M4/485H01M10/054H01M2004/027Y02E60/10
Inventor 肖高汪征东张梦瑶
Owner FUZHOU UNIV
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