Method for modifying sodium ion battery negative electrode material titanium dioxide

A sodium-ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low rate performance, poor electronic conductivity, etc., and achieve the goal of improving electronic conductivity, improving conductivity, and inhibiting volume expansion Effect

Active Publication Date: 2018-08-31
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above technical problems in the prior art, the invention provides a method for modifying titanium dioxide, the negative electr

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  • Method for modifying sodium ion battery negative electrode material titanium dioxide
  • Method for modifying sodium ion battery negative electrode material titanium dioxide
  • Method for modifying sodium ion battery negative electrode material titanium dioxide

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Embodiment 1

[0035] Add 3.4g of tetrabutyl titanate to 20ml of absolute ethanol, then add 5ml of 40% hydrofluoric acid solution, stir well, conduct a hydrothermal reaction at 180°C for 24 hours, collect the precursor by centrifugation, and mix it with 1g of biuret Then, under a nitrogen atmosphere, the tube furnace was used to raise the temperature to 500° C. at a rate of 3° C. / min and keep at a constant temperature for 4 hours. After natural cooling, a titanium nitride-coated nitrogen-doped titanium dioxide material was obtained. figure 1 It is an XRD pattern, as can be seen from the figure, the material prepared by the above method is anatase titanium dioxide (JCPDS: No.21-1272); 2 In contrast, the modified sample has a weaker new diffraction peak at 42.7 degrees, corresponding to the diffraction peak of TiN (JCPDS: No.87-0632), which proves the existence of titanium nitride in the composite material. Calculated by the Scherrer formula, it can be known that the grain size of the titanium...

Embodiment 2

[0041] Add 3.4g of tetrabutyl titanate to 20ml of absolute ethanol, then add 5ml of 40% hydrofluoric acid solution, stir well, react with hydrothermal reaction at 180°C for 24 hours, collect the precursor by centrifugation, mix it with 1g of melamine Under a nitrogen atmosphere, the temperature was raised to 700°C at a rate of 3°C / min in a tube furnace and kept at a constant temperature for 4 hours. After natural cooling, a nitrogen-doped titanium dioxide material coated with titanium nitride was prepared.

[0042] Negative electrode preparation: mix the titanium nitride-coated nitrogen-doped titanium dioxide negative electrode material prepared above, conductive carbon black, and binder carboxymethyl cellulose (CMC) in a mass ratio of 8:1:1, and coat it on a copper foil After drying, it was punched into electrode sheets and dried in vacuum at 100°C for 12 hours.

Embodiment 3

[0044] Add 3.4g of tetrabutyl titanate to 50ml of absolute ethanol, then add 5ml of 40% hydrofluoric acid solution, stir well, conduct a hydrothermal reaction at 180°C for 24 hours, collect the precursor by centrifugation, mix it with 1g of urea Under a nitrogen atmosphere, the temperature was raised to 700°C at a rate of 3°C / min in a tube furnace and kept at a constant temperature for 4 hours. After natural cooling, a nitrogen-doped titanium dioxide material coated with titanium nitride was prepared.

[0045] Negative electrode preparation: mix the titanium nitride-coated nitrogen-doped titanium dioxide negative electrode material prepared above, conductive carbon black, and binder carboxymethyl cellulose (CMC) in a mass ratio of 8:1:1, and coat it on a copper foil After drying, it was punched into electrode sheets and dried in vacuum at 100°C for 12 hours.

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Abstract

The invention provides a method for modifying a sodium ion battery negative electrode material titanium dioxide, wherein the method comprises the steps : mixing a titanium source and a structure-directing agent to form a titanium-containing solution, and carrying out a hydrothermal reaction to prepare a nano titanium dioxide precursor, wherein the molar ratio of the titanium source to the structure-directing agent is 1:(0.1-1), and the ratio relationship between the titanium source and a solvent is (0. 01-0.5) mol:1 L; and mixing the obtained nano titanium dioxide precursor with a solid nitrogen source with the mass ratio of the titanium source to the nitrogen source of 1:(0.1-10), stirring and grinding, and calcining the mixture in protective gas to obtain the sodium ion battery negativeelectrode material titanium dioxide. In the method, cladding of a titanium nitride thin film can significantly enhance the electronic conductivity, so the sodium storage capacity and the rate performance of the titanium dioxide material are improved; at the same time, with doping of the nitrogen element, the conductivity of titanium dioxide can be further effectively improved, so excellent electrochemical performance is showed.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and relates to a sodium ion battery, in particular to a method for modifying titanium dioxide, a negative electrode material of the sodium ion battery. Background technique [0002] Na-ion batteries have the characteristics of abundant resources, low cost, and wide distribution of raw materials. At the same time, sodium and lithium are congener elements with similar physical and chemical properties. Therefore, sodium-ion batteries provide new possibilities for energy storage technology. Due to the sodium ion radius Specific lithium ion radius 35% larger, which hinders the intercalation and deintercalation of the graphite sheet structure, so graphite, which is commonly used as the anode material of lithium-ion batteries, cannot continue to be used in sodium-ion batteries, especially in the case of high-rate charge and discharge. more difficult, resulting in poorer rate performan...

Claims

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Application Information

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IPC IPC(8): H01M4/48
CPCH01M4/48Y02E60/10
Inventor 王保峰马潇许贝贝平秋实田剑莉亚张智慧
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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