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Preparation method of titanium dioxide/tritin tetroxide negative electrode material for lithium ion battery

A technology of tritin tetroxide and lithium ion batteries, which is applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problems of poor cycle performance and low capacity, and achieve good cycle performance. , Relieve volume change, avoid the effect of capacity decay too fast

Active Publication Date: 2019-10-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the prior art pure phase Sn 3 o 4 Insufficiency of low discharge retention capacity (i.e. poor cycle performance) after cycling, the present invention provides a mesoporous titanium dioxide nanoribbon (hereinafter referred to as TiO 2 ) supported tritin tetroxide (hereinafter referred to as Sn 3 o 4 ) preparation method of lithium ion battery negative electrode material, the synthesized mesoporous titania nanobelt (TiO 2 ) supported tritin tetroxide nanosheets (Sn 3 o 4 ) composite due to mesoporous TiO 2 The introduction of nanobelts can effectively alleviate the volume change caused by charging and discharging, and can avoid the rapid decay of the material electrode capacity, making TiO 2 @Sn 3 o 4 The capacity of anode materials is higher than that of pure phase Sn 3 o 4 cycle performance

Method used

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  • Preparation method of titanium dioxide/tritin tetroxide negative electrode material for lithium ion battery
  • Preparation method of titanium dioxide/tritin tetroxide negative electrode material for lithium ion battery
  • Preparation method of titanium dioxide/tritin tetroxide negative electrode material for lithium ion battery

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Embodiment 1

[0040] (1) A certain amount of commercial TiO 2 The powder is added to a molar concentration of 10±0.1molL -1 NaOH aqueous solution, stirred until completely dissolved; among them, TiO 2 The molar ratio of powder to NaOH is 1:80;

[0041] (2) Place the solution obtained in step (1) in a hydrothermal kettle with a certain volume and heat it up to 180°C at a heating rate of 8-10°C / min, and naturally cool to room temperature after reacting for 24 hours; wherein the solution and the hydrothermal kettle The volume ratio is 80:100;

[0042] (3) Wash the solid in the product obtained in step (2) several times with deionized water, place the washed product in a vacuum oven at 50-60°C and dry to constant weight, and grind to obtain Na 2 Ti 3 o 7 nanobelt;

[0043] (4) adding the product obtained in step (3) to a molar concentration of 1 ± 0.1molL -1 In aqueous HCl solution, stirred for 24h; where, Na 2 Ti 3 o 7 The volume ratio of nanobelts and HCl aqueous solution is 1:3.

...

Embodiment 2

[0055] (1) A certain amount of commercial TiO 2 The powder is added to a molar concentration of 10±0.1molL -1 NaOH aqueous solution, stirred until completely dissolved; among them, TiO 2 The molar ratio of powder to NaOH is 1:80;

[0056] (2) Place the solution obtained in step (1) in a hydrothermal kettle with a certain volume and heat it up to 180°C at a heating rate of 8-10°C / min, and naturally cool to room temperature after reacting for 24 hours; wherein the solution and the hydrothermal kettle The volume ratio is 80:100;

[0057] (3) Wash the solid in the product obtained in step (2) several times with deionized water, place the washed product in a vacuum oven at 50-60°C and dry to constant weight, and grind to obtain Na 2 Ti 3 o 7 nanobelt;

[0058] (4) adding the product obtained in step (3) to a molar concentration of 1 ± 0.1molL -1 In aqueous HCl solution, stirred for 24h; where, Na 2 Ti 3 o 7 The volume ratio of nanobelts and HCl aqueous solution is 1:3.

...

Embodiment 3

[0068] (1) A certain amount of commercial TiO 2 The powder is added to a molar concentration of 10±0.1molL -1 NaOH aqueous solution, stirred until completely dissolved; among them, TiO 2 The molar ratio of powder to NaOH is 1:80;

[0069] (2) Place the solution obtained in step (1) in a hydrothermal kettle with a certain volume and heat it up to 180°C at a heating rate of 8-10°C / min, and naturally cool to room temperature after reacting for 24 hours; wherein the solution and the hydrothermal kettle The volume ratio is 80:100;

[0070] (3) Wash the solid in the product obtained in step (2) several times with deionized water, place the washed product in a vacuum oven at 50-60°C and dry to constant weight, and grind to obtain Na 2 Ti 3 o 7 nanobelt;

[0071] (4) adding the product obtained in step (3) to a molar concentration of 1 ± 0.1molL -1 In aqueous HCl solution, stirred for 24h; where, Na 2 Ti 3 o 7 The volume ratio of nanobelts and HCl aqueous solution is 1:3.

...

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Abstract

The invention provides a preparation method for a TiO2 / Sn3O4 negative electrode material for a lithium ion battery. A mesoporous TiO2 nanoribbon-supported Sn3O4 nanosheet composite material is synthesized, the introduction of a mesoporous TiO2 nanoribbon is beneficial for lithium ion transmission during the charge-discharge process, the volume change caused by charging and discharging is effectively reduced, and the problems that the capacity of a material electrode is too rapid in attenuation and the cycle stability is poor are prevented; the mesoporous TiO2 nanoribbon substrate has a mechanical support effect, Sn3O4 nanosheets are uniformly dispersed on a surface of the mesoporous TiO2 nanoribbon substrate to form a one-dimensional nanometer structure; and moreover, the mesoporous TiO2 nanoribbon has lithium storage performance, so that the capacity of a product is higher than the cycle property of pure Sn3O4, and the single defect of a Sn3O4 electrode is made up.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing negative electrode materials. Background technique [0002] Sn-based materials are considered to be a class of anode materials for lithium-ion batteries with broad development prospects due to their high theoretical capacity, low cost, low toxicity, and broad practicability. [0003] The document "Journal of Alloys and Compounds, 2017, 690:765-770" discloses a hydrothermal synthesis of Sn 3 o 4 anode material method, the SnCl 2 2H 2 O and trisodium citrate (C 6 h 5 Na 3 o 7 ) was dissolved in deionized water, and NaOH solution was added after stirring. The prepared mixed solution was put into a hydrothermal kettle, and the hydrothermal kettle was placed in an electric furnace and heated at 180°C for 12h. After the temperature naturally dropped to room temperature, the obtained product was subjected to Filter, wash and dry in vacuo to obtain Sn ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/48H01M10/0525Y02E60/10
Inventor 黄英陈雪芳张开创闫静张信魏超冯玄圣
Owner NORTHWESTERN POLYTECHNICAL UNIV
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