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Multi-level structure combined with tio 2 Preparation and Application of Composite Graphene Anode Materials

A technology of composite graphene and negative electrode materials, which is applied in the field of electrochemical energy storage, can solve the problems of low conductivity and cycle performance that cannot meet the requirements, achieve high conductivity, improve electrochemical kinetics, and high-current discharge capacity Effect

Active Publication Date: 2021-05-28
JIANGSU DONGYUAN ELECTRIC APPLIANCEGROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN108511696A discloses a kind of preparation method of titanium dioxide / graphene composite material, this material is used as negative electrode material, and 0.1C rate test result shows, and discharge specific capacity is 253.6mAh / g for the first time, and discharge specific capacity after 50 cycles is 183.6mAh / g, the capacity retention rate is 72.40%, which improves the electrochemical performance to a certain extent, but due to the bulk TiO 2 Due to its low electrical conductivity and other characteristics, the final cycle performance of the material cannot meet the requirements

Method used

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  • Multi-level structure combined with tio <sub>2</sub> Preparation and Application of Composite Graphene Anode Materials
  • Multi-level structure combined with tio <sub>2</sub> Preparation and Application of Composite Graphene Anode Materials
  • Multi-level structure combined with tio <sub>2</sub> Preparation and Application of Composite Graphene Anode Materials

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Experimental program
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Effect test

Embodiment 1

[0025] Three-dimensional Hierarchical Structured TiO 2 The preparation method of composite graphene negative electrode material, the method comprises the following steps:

[0026] 1. Mix glycerol and ethanol uniformly at a volume ratio of 1:4 to obtain a primary solvent. According to the volume ratio of tetrabutyl titanate (TBOT) to the primary solvent is 10%, add titanic acid to the primary solvent tetrabutyl ester. After stirring evenly, put it into the reactor, and conduct a solvothermal reaction at 180°C for 50 hours to obtain a three-dimensional multi-level structure TiO 2 Precursor. Depend on figure 1 The a1 and a2 SEM images in the figure can clearly see that the three-dimensional multi-level structure TiO 2 The precursor is a three-dimensional multi-level flower structure assembled by a similar "ribbon" structure.

[0027] Ⅱ. The three-dimensional hierarchical structure TiO obtained in step Ⅰ 2 The precursor is placed in the furnace with an air flow rate of 25ml / ...

Embodiment 2

[0031] Three-dimensional Hierarchical Structured TiO 2 The preparation method of composite graphene negative electrode material, the method comprises the following steps:

[0032] 1. Mix glycerin and ethanol uniformly at a volume ratio of 1:1 to obtain a primary solvent. According to the volume ratio of tetrabutyl titanate (TBOT) to the primary solvent is 2%, add titanic acid to the primary solvent tetrabutyl ester. After stirring evenly, put it into the reactor, and conduct a solvothermal reaction at 180°C for 12 hours to obtain a three-dimensional multi-level structure TiO 2 Precursor.

[0033] Ⅱ. The three-dimensional hierarchical structure TiO obtained in step Ⅰ 2The precursor was placed in the furnace with an air flow rate of 1ml / min. First, the temperature was raised to 400°C at a heating rate of 5°C / min, and the temperature was maintained for 1 hour. After the first calcination was completed, the sample was cooled to room temperature and then the second secondary ca...

Embodiment 3

[0036] Three-dimensional Hierarchical Structured TiO 2 The preparation method of composite graphene negative electrode material, the method comprises the following steps:

[0037] 1. Mix glycerin and ethanol uniformly at a volume ratio of 1:2 to obtain a primary solvent. According to the volume ratio of tetrabutyl titanate (TBOT) to the primary solvent is 5%, add titanic acid to the primary solvent tetrabutyl ester. After stirring evenly, put it into the reactor, and conduct a solvothermal reaction at 180°C for 20 hours to obtain a three-dimensional multi-level structure TiO 2 Precursor.

[0038] Ⅱ. The three-dimensional hierarchical structure TiO obtained in step Ⅰ 2 The precursor is placed in the furnace with an air flow rate of 20ml / min. First, the temperature is raised to 300°C at a rate of 2°C / min, and the temperature is maintained for 3 hours. After the first calcination is completed, the sample is cooled to room temperature and then the second secondary calcination....

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Abstract

The invention discloses a multi-level structure combined with TiO 2 A method for preparing a composite graphene negative electrode material, comprising the following steps: using tetrabutyl titanate as a titanium source, alcohol compounds as a primary solvent, and preparing a precursor by a solvothermal method; the precursor is lower than the phase transition temperature, Transformation into phase-bound TiO with anatase and rutile phases via a two-step calcination method 2 ; Combined with TiO 2 Mix evenly with graphene and place in a secondary solvent, constant temperature, and ultrasonic treatment to obtain a three-dimensional multi-level structure of TiO 2 Composite graphene materials. A Hierarchical Structured TiO 2 The composite graphene negative electrode material is prepared by the above preparation method. A battery electrode is composed of multi-level structure combined with TiO 2 Composite graphene negative electrode material is prepared. The final material of the present invention has both nano-TiO 2 The high cycle life endowed to the battery, and the high conductivity and large current discharge ability endowed by graphene to the electrode material.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a three-dimensional multi-level structure phase-junction TiO of a negative electrode material of a lithium ion battery 2 Preparation and application of composite graphene materials. Background technique [0002] In the past few decades, lithium-ion batteries have been widely used in portable electronic devices, electric vehicles, and energy storage due to their high energy density and long cycle life. Currently, graphite is used as the main anode material in the industrial production of Li-ion batteries, however, the low discharge voltage of graphite electrodes (0.2 V vs. Li / Li+) still affects the high-rate performance and safety performance of Li-ion batteries ( During the charge and discharge process, lithium will be separated to form lithium dendrites). Transition metal oxides are considered as a potential high-energy-density lithium-ion battery anod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/36H01M4/48H01M4/583H01M10/0525
CPCH01M4/13H01M4/362H01M4/483H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 林伟徐兵
Owner JIANGSU DONGYUAN ELECTRIC APPLIANCEGROUP
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