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A kind of potassium titanyl phosphate thin film negative electrode material and its preparation method and application

A technology of potassium titanyl phosphate and negative electrode materials, which is applied in nanotechnology, chemical instruments and methods, phosphorus compounds, etc. for materials and surface science, and can solve the problem of reducing the mass fraction of active materials in electrodes, not suitable for battery fields, and high temperature Response to high energy consumption and other issues, to achieve the effect of facilitating the transmission of electrons, excellent cycle stability, and low cost

Active Publication Date: 2021-07-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the existing technology for preparing potassium titanyl phosphate, the potassium titanyl phosphate prepared by liquid phase co-precipitation, ion implantation or ion exchange is used in the field of nonlinear optical materials, which is not suitable for the battery field; Potassium titanyl phosphate powder material is synthesized by solid phase method for use in the battery field. This preparation method is prepared through two steps of grinding and high-temperature solid-state reaction. During the grinding process, the raw materials may be mixed unevenly; in addition, the high-temperature reaction consumes a lot of energy and may damage the material. The prepared powder needs to be mixed with additives and then coated on the current collector to obtain an electrode, which reduces the mass fraction of the electrode active material, thereby limiting the improvement of its electrochemical performance

Method used

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  • A kind of potassium titanyl phosphate thin film negative electrode material and its preparation method and application
  • A kind of potassium titanyl phosphate thin film negative electrode material and its preparation method and application
  • A kind of potassium titanyl phosphate thin film negative electrode material and its preparation method and application

Examples

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Embodiment 1

[0031] This example shows a preparation method of potassium titanyl phosphate thin film negative electrode material.

[0032] Potassium titanyl phosphate film is synthesized by a one-step hydrothermal method, including the following steps:

[0033] (1) 50μm 3.5*3.5cm 2 Polish the titanium sheet with 360-mesh sandpaper to clean the oxide layer on its surface; (2) ultrasonically clean it with hydrochloric acid, acetone and absolute ethanol for 15 minutes each; (3) mix potassium dihydrogen phosphate and deionized water evenly to obtain 2mol / L (4) place the titanium sheet and the above solution in an autoclave with a polytetrafluoroethylene liner substrate, and conduct a hydrothermal reaction at 220°C for 24 hours; (5) put the above step (4) after the hydrothermal reaction for a long The titanium sheet with the potassium titanyl phosphate film is taken out, rinsed with deionized water, and dried in an oven to finally prepare a binder-free potassium titanyl phosphate negative elec...

Embodiment 2

[0036] This example shows a sodium-ion battery in which a potassium titanyl phosphate film is used as the negative electrode of the binder-free sodium-ion battery.

[0037] The potassium titanyl phosphate thin film obtained in embodiment 1 is cut into 1*1cm 2 The square electrode sheet is used as the negative electrode material of the sodium ion battery, and the counter electrode and the reference electrode of the sodium ion battery are metallic sodium.

[0038] The formula of the electrolyte consists of: the solvent is Diglyme (diglyme); the electrolyte sodium salt is NaPF 6 , the concentration of the substance in the electrolyte is 1mol / L.

[0039] Assemble the above-mentioned potassium titanyl phosphate negative electrode sheet, electrolyte, sodium metal and others such as glass fiber diaphragm, stainless steel gasket, spring and battery casing into a 2032-type button battery.

[0040]Carry out cyclic voltammetry and constant current charge and discharge tests on the batt...

Embodiment 3

[0042] This example shows a potassium titanyl phosphate thin film used as the negative electrode of the binder-free potassium ion battery.

[0043] The potassium titanyl phosphate thin film obtained in embodiment 1 is cut into 1*1cm 2 The square electrode sheet is used as the negative electrode material of the potassium ion battery, and the counter electrode and the reference electrode of the potassium ion battery are metallic potassium.

[0044] The composition of the electrolyte is as follows: the solvent is EC (ethylene carbonate) / PC (propylene carbonate); the electrolyte potassium salt is KPF 6 , the concentration of the substance in the electrolyte is 1mol / L.

[0045] Assemble the above-mentioned potassium titanyl phosphate negative electrode sheet, electrolyte, metal potassium foil and others such as glass fiber diaphragm, stainless steel gasket, spring and battery casing into a 2032-type button battery.

[0046] Carry out cyclic voltammetry and constant current charge...

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Abstract

The invention belongs to the technical field of sodium / potassium ion batteries, and in particular relates to a potassium titanyl phosphate thin film negative electrode material and its preparation method and application. It uses a titanium substrate as a current collector and grows potassium titanyl phosphate (chemical formula for KTiOPO 4 ) film as the active material, the mass fraction of the active material is 100%, the potassium titanyl phosphate film has excellent flexibility, and it is composed of potassium titanyl phosphate nanowires to form an almond-shaped microstructure, and the nanowires There are gaps in between. The process of the present invention is simple to prepare, high in repeatability, low in energy consumption, and low in cost, and is of great significance to the research of flexible sodium / potassium ion battery anode materials; at the same time, it can also realize large-area uniform potassium titanyl phosphate films on titanium substrates It grows in the ground and is convenient for industrial application. In addition, the one-step hydrothermal method used in the present invention to grow materials in situ on metal substrates can also be applied to the synthesis of other materials.

Description

technical field [0001] The invention belongs to the technical field of sodium / potassium ion batteries, and in particular relates to a potassium titanyl phosphate film negative electrode material and a preparation method thereof, which can be used as the negative electrode material of sodium / potassium ion batteries. Background technique [0002] Metal sodium and potassium are considered to be the most promising batteries to replace lithium-ion batteries in our lives due to their abundant reserves, low cost, and similar physical and chemical properties and energy storage mechanisms to lithium. one. due to sodium ions and potassium ions The radius is larger than that of Li-ion The radius of the electrode is large, and its intercalation / extraction usually causes changes in the structure of the electrode material, which in turn leads to problems such as material lattice strain, material structure stability, and poor cycle life. Therefore, most of the existing lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525H01M10/054C01B25/45B82Y30/00
CPCB82Y30/00C01B25/45H01M4/5825H01M10/0525H01M10/054Y02E60/10
Inventor 刘金平刘文燚易成军刘雯聪陈瑶郭雪丽
Owner WUHAN UNIV OF TECH
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