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Preparation method for titanium oxide/tin oxide composite membrane for sodium ion battery cathode

A technology of sodium ion battery and negative electrode material, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of complex preparation methods, and achieve the effects of high preparation efficiency, high specific capacity and good cycle stability

Active Publication Date: 2019-03-29
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its preparation method is relatively complicated, and it needs to be completed through a multi-step method, and the prepared composite film also needs high temperature and long-term annealing treatment.

Method used

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  • Preparation method for titanium oxide/tin oxide composite membrane for sodium ion battery cathode
  • Preparation method for titanium oxide/tin oxide composite membrane for sodium ion battery cathode
  • Preparation method for titanium oxide/tin oxide composite membrane for sodium ion battery cathode

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Prepare the electrolyte used for plasma electrolytic oxidation: the electrolyte is uniformly mixed with phosphoric acid, sodium silicate, sodium stannate, glycerol and deionized water, and contains phosphoric acid (85 wt.% ) 1 ml, 1 g sodium silicate, 5 g sodium stannate, and 5 ml glycerol.

[0024] (2) Pretreatment of titanium foam (with a pore size of 1 μm): Ultrasonic cleaning with acetone and alcohol for 10 min, respectively, to remove surface oil, and then dry it.

[0025] (3) Plasma electrolytic oxidation treatment: The pretreated foamed titanium is used as the anode, and the stainless steel is used as the cathode, and they are immersed in the electrolytic tank containing the prepared electrolyte; under normal temperature and pressure conditions, a positive direction is applied between the two electrodes The voltage is 300 V, the negative voltage is 50 V, the pulse frequency is 50 Hz, the processing time is 1 min, and then the power is turned off to prepare a ...

Embodiment 2

[0027] (1) Prepare the electrolyte used for plasma electrolytic oxidation: the electrolyte is uniformly mixed with phosphoric acid, sodium silicate, sodium stannate, glycerol and deionized water, and contains phosphoric acid (85 wt.% ) 5 ml, sodium silicate 5 g, sodium stannate 15 g, glycerol 15 ml.

[0028] (2) Pretreatment of titanium foam (with a pore size of 1 μm): Ultrasonic cleaning with acetone and alcohol for 10 min, respectively, to remove surface oil, and then dry it.

[0029] (3) Plasma electrolytic oxidation treatment: The pretreated foamed titanium is used as the anode, and the stainless steel is used as the cathode, and they are immersed in the electrolytic tank containing the prepared electrolyte; under normal temperature and pressure conditions, a positive direction is applied between the two electrodes The voltage is 450 V, the negative voltage is 100 V, the pulse frequency is 150 Hz, the processing time is 10 min, and then the power is turned off to prepare a...

Embodiment 3

[0031] (1) Prepare the electrolyte used for plasma electrolytic oxidation: the electrolyte is uniformly mixed with phosphoric acid, sodium silicate, sodium stannate, glycerol and deionized water, and contains phosphoric acid (85 wt.% ) 10 ml, sodium silicate 10 g, sodium stannate 30 g, glycerol 30 ml.

[0032] (2) Pretreatment of titanium foam (with a pore size of 1 μm): Ultrasonic cleaning with acetone and alcohol for 10 min, respectively, to remove surface oil, and then dry it.

[0033] (3) Plasma electrolytic oxidation treatment: The pretreated foamed titanium is used as the anode, and the stainless steel is used as the cathode, and they are immersed in the electrolytic tank containing the prepared electrolyte; under normal temperature and pressure conditions, a positive direction is applied between the two electrodes The voltage is 650 V, the negative voltage is 150 V, the pulse frequency is 300 Hz, the treatment time is 30 min, and then the power is turned off to prepare ...

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Abstract

The invention provides a method of preparing a TiO2 / SnO2 cathode material of a sodium ion battery by using a plasma electrolytic oxidation technique. An electrolyte is prepared from 1-10 ml / l phosphoric acid (85wt.%), 1-10 g / L sodium silicate, 5-30 g / L sodium stannate and 5-30 ml / L glycerol separately. The method comprises the following steps: by taking foamed titanium as an anode and stainless steel as a cathode, immersing the anode and the cathode into a special electrolyte solution containing phosphoric acid, sodium silicate, sodium stannate, glycerol and deionized water; applying a bipolarpulse voltage between the two electrodes at constant temperature and constant pressure, wherein plasma discharge happens on the surface of the foamed titanium; turning off a power supply after discharge for a period of time to prepare the TiO2 / SnO2 composite membrane on the surface of the foamed titanium. The composite membrane can be used as a cathode material of the sodium ion battery. The TiO2 / SnO2 cathode material makes full use of a high capacity characteristic and high cyclic stability of TiO2. The method is simple in preparation process, low in production cost and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and relates to a one-step method for preparing TiO on the surface of foamed titanium by utilizing the phenomenon of plasma electrolytic oxidation in acidic solution 2 / SnO 2 The composite film process is a high-efficiency and low-cost preparation method for oxide negative electrode materials. Background technique [0002] Energy shortage is a major problem facing mankind in the 21st century. The development and utilization of renewable energy cannot be separated from energy conversion and storage. For a long time, lithium-ion batteries have been highly valued due to their high energy density and power density, small size, long life, and no memory effect. These characteristics limit the large-scale application of lithium-ion batteries. Relatively speaking, sodium-ion batteries have the advantages of abundant sodium resource storage and low price, and have become a research hotspot ...

Claims

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Application Information

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IPC IPC(8): C25D11/26H01M4/36H01M4/48H01M10/054
CPCC25D11/26H01M4/362H01M4/48H01M10/054Y02E60/10
Inventor 吴杰李国政邓建华董磊李德军薛文斌
Owner TIANJIN NORMAL UNIVERSITY
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