Modified one-dimensional TiNb24O62 as well as preparation method and application thereof

A modification and niobium source technology, applied in chemical instruments and methods, niobium compounds, inorganic chemistry, etc., can solve problems such as cumbersome synthesis process, unsuitable for industrial scale application, and unsatisfactory electrochemical performance

Pending Publication Date: 2020-02-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Shu et al. (Deepinsights into kinetics and structural evolution of nitrogen-doped carboncoated TiNb 24 o 62 nanowires as high-performance lithium containe, Nano Energy, 54 (2018) 227-237) discloses the synthesis of TiNb by electrospinning 24 o 62 , the method prepared a stack of TiNb structures 24 o 62 , but the problem of poor intrinsic electronic conductivity is still unsolved, and the electrochemical performance is also not ideal.
[0005] In general, the current focus is on modifying the intrinsic electronic conductivity of materials by adding additional highly conductive carbon-based materials such as graphene and carbon nanotubes, but these highly conductive additives are generally cumbersome and expensive to synthesize. , not suitable for industrial scale applications

Method used

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  • Modified one-dimensional TiNb24O62 as well as preparation method and application thereof
  • Modified one-dimensional TiNb24O62 as well as preparation method and application thereof
  • Modified one-dimensional TiNb24O62 as well as preparation method and application thereof

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preparation example Construction

[0030] The invention provides a modified one-dimensional TiNb 24 o 62 The preparation method comprises the following steps:

[0031] Mix polyvinylpyrrolidone, N,N-dimethylformamide and acid solution to obtain dispersant A;

[0032] Mixing the niobium source, the titanium source and the dispersant A to obtain a B solution;

[0033] After the B solution is electrospun, the obtained product is first calcined to obtain a one-dimensional TiNb 24 o 62 ;

[0034] The one-dimensional TiNb 24 o 62 Carrying out the second calcination to obtain the modified one-dimensional TiNb 24 o 62 .

[0035] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0036] In the present invention, polyvinylpyrrolidone, N,N-dimethylformamide and acid solution are mixed to obtain dispersant A; in the present invention, the mixing is preferably to add the polyvinylpyrrolidone to N,N-dimethylf...

Embodiment 1

[0051] Dissolve 3.3g of polyvinylpyrrolidone in a mixture of 20mL N,N-dimethylformamide and 2mL of acetic acid to obtain Dispersant A;

[0052] Mix 4.7635g of niobium pentachloride with dispersant A, stir for 3h, add 251μL of tetrabutyl titanate dropwise, and continue stirring for 1h to obtain solution B (the molar ratio of Ti to Nb is 1:24);

[0053] The B solution was transferred to the electrospinning syringe, and after electrospinning (needle type: 21G, distance between the needle and the receiving plate was 15cm, voltage 20kV, advancing speed 0.01mm / min), the obtained product was subjected to the first Calcination (nitrogen atmosphere, temperature 850°C, time 4h) to obtain one-dimensional TiNb 24 o 62 ;

[0054] The one-dimensional TiNb 24 o 62 Carry out the second calcination (hydrogen atmosphere, temperature 700°C, time 1h) to obtain modified one-dimensional TiNb 24 o 62 (Denoted as H-TiNb 24 o 62 );

[0055] The one-dimensional TiNb prepared in this embodiment...

Embodiment 2

[0059] The preparation reference example 1 of B solution;

[0060] The B solution was transferred to the electrospinning syringe, and after electrospinning (needle type: 21G, distance between the needle and the receiving plate was 15cm, voltage 15kV, advancing speed 0.01mm / min), the obtained product was subjected to the first Calcination (nitrogen atmosphere, temperature 850°C, time 4h) to obtain one-dimensional TiNb 24 o 62 ;

[0061] The one-dimensional TiNb 24 o 62 Carry out the second calcination (hydrogen atmosphere, temperature 700°C, time 1h) to obtain modified one-dimensional TiNb 24 o 62 ;

[0062] The electrochemical test process refers to Example 1, and the test result is: the modified one-dimensional TiNb 24 o 62 at 0.1Ag -1 The reversible specific capacity can reach 280mA·h·g under the current density -1 , and at 1A·g -1 After 100 cycles at the current density, the retention rate of its specific capacity can reach 90.0%, and it has more excellent rate p...

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Abstract

The invention relates to the technical field of electrode materials, and in particular relates to modified one-dimensional TiNb24O62 as well as a preparation method and application thereof. Accordingto the method, one-dimensional TiNb24O62 prepared by electrostatic spinning is subjected to further calcination modification, so that oxygen vacancies can be formed in the TiNb24O62, free electrons are generated and can freely migrate at the vacancies, and the intrinsic electronic conductivity can be improved; and the oxygen vacancies provide a large number of active sites for storage of lithium ions, thereby facilitating improving the specific capacity, so that the electrochemical performance is obviously improved. The modification method has a simple process, a remarkable effect and low energy consumption, and is suitable for industrial large-scale production, and the modified TiNb24O62 has good consistency, high electronic conductivity and excellent electrochemical performance, and haswide application prospects.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a modified one-dimensional titanium niobate and its preparation method and application. Background technique [0002] In order to adapt to the development needs of the new era, the development and utilization of new energy has become an extremely important and urgent research topic for mankind. demanding. Lithium-ion batteries have been widely valued due to their excellent performance. It has many advantages such as high energy density, high working voltage, long cycle life, and small self-discharge, and has achieved large-scale applications. [0003] At present, lithium-ion batteries generally use graphite and lithium titanate as negative electrode materials. Graphite has 372mA·g -1 The theoretical specific capacity and electrochemical performance are stable, but its first Coulombic efficiency is low, the rate performance is not good, the charge and discharge plat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00H01M4/485H01M10/0525
CPCC01G33/00C01P2002/72C01P2002/86C01P2004/03C01P2004/62H01M4/485H01M10/0525Y02E60/10
Inventor 张校刚蒋江民朱琪窦辉贺文杰徐颖弘
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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