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Tubular TiO2/carbon lithium ion battery negative electrode material and preparation method and application thereof

A lithium-ion battery, titanium dioxide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cumbersome and complicated preparation process and high raw material cost, achieve simple operation process, improved electrical conductivity and lithium ion conductivity, large The effect of energy density

Inactive Publication Date: 2019-05-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these methods have the disadvantages of complicated preparation process and high cost of raw materials.

Method used

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  • Tubular TiO2/carbon lithium ion battery negative electrode material and preparation method and application thereof
  • Tubular TiO2/carbon lithium ion battery negative electrode material and preparation method and application thereof
  • Tubular TiO2/carbon lithium ion battery negative electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation of tubular titanium dioxide / carbon lithium ion battery negative electrode material specifically comprises the following steps:

[0031] (1) Preparation of precursor solution: Weigh 0.0013 mol of titanyl sulfate, 0.13 mol of glycerol, 0.35 mol of ethanol and 0.09 mol of ether and mix well to obtain molecular sieve precursor solution;

[0032] (2) Preparation of organotitanium precursor: transfer the well-mixed precursor solution to a 50 mL polytetrafluoroethylene-lined reactor, continue to react at 110 °C for 2 days, and cool naturally to room temperature to obtain The final precipitated product was washed with an aqueous solution of ethanol at a volume ratio of 1:1, washed by centrifugation for 3 times, and dried at 100°C for 12 hours to obtain an organotitanium precursor;

[0033] (3) Sintering stage: The obtained organotitanium precursor was sintered at 600°C for 3 hours in an argon atmosphere, and cooled naturally to room temperature to obtain a finis...

Embodiment 2

[0039] The preparation of tubular titanium dioxide / carbon lithium ion battery negative electrode material specifically comprises the following steps:

[0040](1) Preparation of precursor solution: Weigh 0.001 mol of titanium tetrachloride, 0.1 mol of ethylene glycol, 0.3 mol of methanol and 0.05 mol of ether and mix well to obtain a molecular sieve precursor solution;

[0041] (2) Preparation of organotitanium precursor: Transfer the well-mixed precursor solution to a 50 mL polytetrafluoroethylene-lined reactor, continue to react at 100 °C for 3 days, and cool naturally to room temperature to obtain The final precipitated product is an aqueous solution of ethanol, wherein the volume ratio of ethanol to water is 1:0.5, centrifuged and washed 3 times, and dried at 60°C for 36 hours to obtain an organotitanium precursor;

[0042] (3) Sintering stage: The obtained organic titanium precursor was sintered at 450° C. for 10 hours in an argon atmosphere, and cooled naturally to room t...

Embodiment 3

[0046] The preparation of tubular titanium dioxide / carbon lithium ion battery negative electrode material specifically comprises the following steps:

[0047] (1) Preparation of precursor solution: Weigh 0.002 mol of titanyl sulfate, 0.2 mol of glycerol, 0.4 mol of ethanol and 0.15 mol of ether and mix well to obtain molecular sieve precursor solution;

[0048] (2) Preparation of organotitanium precursor: transfer the well-mixed precursor solution to a 100 mL polytetrafluoroethylene-lined reactor, continue the reaction at 200 °C for 1 day, and cool naturally to room temperature to obtain The final precipitated product is an aqueous solution of ethanol, wherein the volume ratio of ethanol to water is 2:0.5, centrifuged and washed 6 times, and dried at 100°C for 12 hours to obtain an organotitanium precursor;

[0049] (3) Sintering stage: The obtained organic titanium precursor was sintered at 700° C. for 2 hours in an argon atmosphere, and cooled naturally to room temperature t...

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Abstract

The invention discloses a tubular TiO2 / carbon lithium ion battery negative electrode material and preparation method and application thereof. The preparation method comprises the steps of (1) preparing a precursor solution; (2) preparing an organic titanium precursor; and (3) sintering. According to the method, polyhydric alcohols, monohydric alcohol and ether are used as a carbon source, titanylsulfate is used as a titanium source, the organic titanium precursor is prepared by solvothermal synthesis, and a finished product is obtained by inert atmosphere calcination. The prepared material isin a tubular shape assembled by a nanosheet, has richer porosity, larger specific surface area and shorter lithium ion transmission passage, so that excellent lithium battery performance is displayed. The preparation method is wide in raw material source, simple in operation process and high in repeatability and is easy to control. Compared with a traditional titanium-based material, the materialhas higher specific capacity, excellent rate performance and long-term cycle stability and has wide application prospect in the lithium ion battery negative electrode.

Description

technical field [0001] The invention belongs to the field of preparation and application of energy and electrochemical materials, and in particular relates to a tubular titanium dioxide / carbon lithium ion battery negative electrode material and its preparation method and application. Background technique [0002] Due to its stable chemical properties, large specific capacity, good cycle stability and environmental friendliness, titanium dioxide can significantly improve the safety of lithium-ion batteries while reducing production costs, and is an excellent negative electrode material for lithium-ion batteries. However, due to its poor conductivity, its rate performance is poor when used as an electrode material. The traditional best solution is to increase the conductivity by encapsulating carbon, and shorten the migration path of lithium ions by synthesizing special morphology. However, most of these methods have the disadvantages of complicated preparation process and hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M10/0525
CPCY02E60/10
Inventor 黄建林林湘君王亚萌刘亭陈珩柴委牟机熔张文嘉刘江刘美林
Owner SOUTH CHINA UNIV OF TECH
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