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Phosphorus-doped bronze ore phase titanium dioxide nanowire array and preparation and application thereof

A nanowire array, titanium dioxide technology, applied in titanium dioxide, titanium oxide/hydroxide, nanotechnology and other directions, can solve the problems of poor conductivity, limit practical application, hinder capacity and rate performance, etc., to improve capacity and rate performance, The effect of enhancing surface reactivity and electron transport ability and excellent electrochemical performance

Inactive Publication Date: 2019-03-01
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a transition metal oxide, the bronze-phase titanium dioxide has poor electrical conductivity, which severely hinders its capacity and rate performance, limiting the practical application of this material.

Method used

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  • Phosphorus-doped bronze ore phase titanium dioxide nanowire array and preparation and application thereof
  • Phosphorus-doped bronze ore phase titanium dioxide nanowire array and preparation and application thereof
  • Phosphorus-doped bronze ore phase titanium dioxide nanowire array and preparation and application thereof

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preparation example Construction

[0024] The preparation method of phosphor-doped bronze ore phase titanium dioxide nanowire array in the present invention is generally realized by a two-step method of hydrothermal growth and vapor phase doping, and may include the following specific steps:

[0025] (1) Put the clean titanium sheet into sodium hydroxide solution for a certain period of hydrothermal treatment, and grow the precursor sodium titanate nanowire array on the titanium sheet;

[0026] (2) Clean the hydrothermally treated titanium sheet and soak it in a hydrochloric acid solution so that the hydrogen ions in the solution completely replace the sodium ions in the sodium titanate, and then the titanium sheet is cleaned and dried;

[0027] (3) Put the dried titanium flakes and a certain amount of sodium hypophosphite into a ventilated tube furnace, the sodium hypophosphite is placed upstream of the air flow, and the titanium sheet is placed downstream of the air flow;

[0028] (4) In a protective atmosphere, heat ...

Embodiment 1

[0043] Put the clean titanium flakes into the inner lining of a hydrothermal kettle with a volume of 50 ml, then add 30 ml of sodium hydroxide solution with a concentration of 1 mole per liter to the inner lining, and then tighten the reaction kettle and place it at 220 Heat preservation for 3 hours in a high temperature electric furnace; after the reaction is completed, soak the washed titanium flakes in 1 mole per liter of hydrochloric acid solution for 30 minutes, then rinse and dry the titanium flakes; the dried titanium flakes and 0.5 g of sodium hypophosphite is placed in a tube furnace (sodium hypophosphite is upstream, titanium sheet is downstream), and under the protection of argon atmosphere, the temperature is raised to 300 degrees at 2 degrees per minute and kept for 4 hours. The preparation process is completed after reaching room temperature; a light blue film is formed on the titanium sheet, and the reversible capacity of the material is 230.5 mAh / g.

Embodiment 2

[0045] Put the clean titanium flakes into the inner lining of a hydrothermal kettle with a volume of 50 ml, then add 30 ml of sodium hydroxide solution with a concentration of 1 mole per liter to the inner lining, and then tighten the reaction kettle and place it at 220 Heat preservation for 12 hours in a high-temperature electronic furnace; after the reaction is complete, soak the washed titanium flakes in 1 mole per liter of hydrochloric acid solution for 30 minutes, then rinse and dry the titanium flakes; the dried titanium flakes and 0.5g of sodium hypophosphite is placed in a tube furnace (sodium hypophosphite is upstream and titanium sheet is downstream), under the protection of argon atmosphere, the temperature is increased to 400 degrees at 2 degrees per minute and kept for 3 hours. The preparation process is completed after reaching room temperature; a light blue film is formed on the titanium sheet, and the reversible capacity of the material reaches 278.3 mAh per gram...

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Abstract

The invention discloses a phosphorus-doped bronze ore phase titanium dioxide nanowire array and preparation and application thereof. A specific preparation method comprises the steps: a titanium sheetis placed into a sodium hydroxide solution to be subjected to a hydrothermal reaction, then the titanium sheet is soaked in a hydrochloric acid solution, and drying is conducted after washing; and then the titanium sheet and sodium hypophosphite are placed into a tubular furnace, protective gas is introduced, thus the sodium hypophosphite and the titanium sheet are located in the upstream and thedownstream of airflow correspondingly, heating is conducted to 300-500 DEG C, heat preservation is conducted, and the phosphorus-doped bronze ore phase titanium dioxide nanowire array can be obtainedon the titanium sheet. By doping an phosphorus element into the phosphorus-doped bronze ore phase titanium dioxide nanowire array, designing the overall process of the preparation method, and improving parameter conditions of the key hydrothermal reaction and a heat treatment process, the electrochemical lithium storage capacity of the bronze ore phase titanium dioxide nanowire array is effectively enhanced, and a self-supporting lithium-ion battery anode which contains no binder and conductive agent and has the excellent electrochemical properties can be obtained.

Description

Technical field [0001] The invention belongs to the field of preparation technology and electrochemical energy storage of novel electrode materials, and more specifically relates to a preparation method of phosphor-doped bronze ore phase titanium dioxide nanowire arrays. The material prepared by the preparation method can be used as a high-performance negative electrode The material is used in lithium-ion batteries. Background technique [0002] Bronze-phase titanium dioxide has an open crystal structure frame and low lithium ion deintercalation potential (1.5-1.8 volts), and is suitable for use as a negative electrode material for lithium ion batteries. In addition, the material exhibits obvious pseudo-capacitor lithium storage behavior and has fast charge and discharge capabilities. However, as a transition metal oxide, bronze ore-phase titanium dioxide has poor conductivity. This defect seriously hinders the improvement of its capacity and rate performance, and limits the pra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/0525C01G23/047B82Y30/00
CPCB82Y30/00C01G23/047C01P2002/85C01P2004/03H01M4/48H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 申燕曹名磊
Owner HUAZHONG UNIV OF SCI & TECH
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