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Preparation method for TiO2/Sn3O4 negative electrode material for lithium ion battery

A technology of tritin tetroxide and lithium-ion batteries, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as low capacity and poor cycle performance, and alleviate volume changes , good cycle performance, considerable capacity effect

Active Publication Date: 2017-11-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 for TiO2/Sn3O4 negative electrode material for lithium ion battery
  • Preparation method for TiO2/Sn3O4 negative electrode material for lithium ion battery
  • Preparation method for TiO2/Sn3O4 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, and 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 Filter, wash and dry in vacuo to obtain Sn 3 o 4 . ...

Claims

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Application Information

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Patent Type & Authority Applications(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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