Preparation method and application of Ti3+ doped TiO2 nanotube array/sulfonated poly phenol membrane electrode

A technology of sulfonated polyphenol membrane and nanotube array, which is applied in the direction of nanotechnology, nanotechnology, battery electrodes, etc., can solve the problems of unfavorable electrolyte wetting lithium ion transmission, poor gas permeability and lyophilicity, and affecting battery performance. Achieve the effects of improving electrochemical performance, reducing battery internal resistance, and increasing conductivity

Inactive Publication Date: 2017-01-04
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Separator is one of the key components of lithium-ion batteries. Its performance determines the interface structure between the membrane and the electrode, the internal resistance of the battery, etc., which in turn affects the performance of the battery. Commercial separators are mainly microporous polymer films (such as polymer Ethylene PE), although this type of separator has good mechanical properties and chemical stability, but its gas permeability and lyophilicity are poor, which is not conducive to the wetting of the electrolyte and the transmission of lithium ions, resulting in a large internal resistance. Therefore, it is necessary Carry out research on new lithium-ion battery separators

Method used

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  • Preparation method and application of Ti3+ doped TiO2 nanotube array/sulfonated poly phenol membrane electrode
  • Preparation method and application of Ti3+ doped TiO2 nanotube array/sulfonated poly phenol membrane electrode
  • Preparation method and application of Ti3+ doped TiO2 nanotube array/sulfonated poly phenol membrane electrode

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Embodiment 1

[0034] Ti described in this example 3+ doped TiO 2 The preparation method of nanotube array / sulfonated polyphenol membrane electrode, concrete steps are as follows:

[0035] (1) Using the anodic oxidation method, a clean titanium sheet is used as the working electrode, a platinum electrode is used as the counter electrode, and the mass percentage is 0.5% NaF and 14.5% H 2 The mixed solution of O and glycerol is the electrolyte, and the anodic oxidation is carried out at a constant voltage (30V) for 2 hours, and the working electrode is washed and dried to obtain a three-dimensional ordered TiO 2 nanotube array TiO 2 NT;

[0036] (2) In the three-electrode system, TiO prepared by step (1) anodic oxidation 2 NT is the working electrode, the platinum electrode is the counter electrode, the saturated calomel electrode is the reference electrode, and the concentration is 1.0mol / L Na 2 SO 4 The solution is an electrolyte, and the constant voltage (-1.0V) reacts for 200s to obt...

Embodiment 2

[0041] Ti described in this example 3+ doped TiO 2 The preparation method of nanotube array / sulfonated polyphenol membrane electrode, concrete steps are as follows:

[0042] (1) Using the anodic oxidation method, a clean titanium sheet is used as the working electrode, a platinum electrode is used as the counter electrode, and the mass percentage is 0.3% NH 4 F, 14.7% H 2 The mixed solution of O and glycerin is the electrolyte, and the anodic oxidation is carried out at a constant potential (40V) for 4 hours, and the working electrode is washed and dried to obtain a three-dimensional ordered TiO 2 nanotube array TiO 2 NT;

[0043] (2) In the three-electrode system, TiO prepared by step (1) anodic oxidation 2 NT is the working electrode, the platinum electrode is the counter electrode, the saturated calomel electrode is the reference electrode, and the H concentration is 2.5mol / L. 2 SO 4 The solution is an electrolyte, and the constant voltage (-1.5V) reacts for 20s to o...

Embodiment 3

[0048] Ti described in this example 3+ doped TiO 2 The preparation method of nanotube array / sulfonated polyphenol membrane electrode, concrete steps are as follows:

[0049] (1) Using the anodic oxidation method, the cleaned titanium sheet is used as the working electrode, the platinum electrode is the counter electrode, and the mass percentage is 0.7% HF, 14.3% H 2 The mixed solution of O and glycerol is the electrolyte, anodized by constant potential (20V) for 1h, the working electrode is rinsed and dried to obtain three-dimensional ordered TiO 2 nanotube array TiO 2 NT;

[0050] (2) In the three-electrode system, TiO prepared by step (1) anodic oxidation 2 NT is the working electrode, the platinum electrode is the counter electrode, the saturated calomel electrode is the reference electrode, and the concentration is 2.0mol / L Na 2 SO 4 The solution is an electrolyte, and the constant voltage (-0.5V) reacts for 600s to obtain Ti 3+ Doped TiO 2 NT composite electrode T...

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Abstract

The invention discloses a preparation method and application of a Ti3+ doped TiO2 nanotube array / sulfonated poly phenol membrane electrode. A three-dimensional orderly TiO2 nanotube array is prepared through an anodic oxidation method firstly, then a Ti3+ doped TiO2 nanotube array is prepared in a three-electrode system through an electrochemical method and serves as a working electrode, the Ti3+ doped TiO2 nanotube array / sulfonated poly phenol membrane electrode is prepared with a sulfonated phenol solution as the electrolyte through an electrochemical polymerization reaction, and no additional conductive agent or adhesive needs to be added when the obtained membrane electrode is applied to a lithium ion battery. The method is simple in process and friendly to the environment; by doping Ti3+, the conductivity of the TiO2 nanotube array is improved, and electrochemical integration of the membrane electrode is achieved; when the membrane electrode is applied to the lithium ion battery, due to the coordinative effect between a membrane and electrode materials, the charging / discharging specific capacity and circulating stability of the membrane electrode material are improved.

Description

technical field [0001] The invention discloses a Ti 3+ doped TiO 2 The preparation method and application of the nanotube array / sulfonated polyphenol membrane electrode belong to the research field of new energy materials. Background technique [0002] TiO 2 It is an important semiconductor transition metal oxide. It has many advantages such as small volume expansion rate and avoiding the precipitation of metal lithium dendrites. It can be used as a negative electrode material for lithium-ion batteries. The morphology and size effects of electrode materials are important to electrode performance. influence, e.g. TiO prepared by anodic oxidation 2 NT is regular and orderly, has a large specific surface area, and can be directly used as an anode active material for lithium-ion batteries without adding additional binders and conductive agents. [0003] However, due to TiO 2 Inherent semiconducting characteristics—low electrical conductivity limits the full play of its adva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/1391H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00C25D9/02
CPCH01M4/1391H01M4/362H01M4/483H01M4/624H01M10/0525C25D9/02B82Y30/00H01M50/411Y02E60/10
Inventor 侯宏英段继祥刘显茜刘松姚远廖启书
Owner KUNMING UNIV OF SCI & TECH
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