Two-dimensional nanometer thin film negative electrode material of lithium ion battery and preparation method of negative electrode material

A nano-film and two-dimensional nano technology, applied in the field of electrochemistry, can solve the problems of reduced capacity and stability, and achieve the effect of sufficient raw materials, good flexibility, and simple process

Inactive Publication Date: 2016-12-07
FUDAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a new two-dimensional nano film (TiO 2 Two-dimensional nano film) preparation method of anode material to overcome common TiO 2 The problem that the capacity and stability of the negative electrode decrease sharply as the current density increases

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  • Two-dimensional nanometer thin film negative electrode material of lithium ion battery and preparation method of negative electrode material
  • Two-dimensional nanometer thin film negative electrode material of lithium ion battery and preparation method of negative electrode material
  • Two-dimensional nanometer thin film negative electrode material of lithium ion battery and preparation method of negative electrode material

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Embodiment 1

[0032] (1) Growth of TiO on the sponge by atomic layer deposition 2 nano film;

[0033] In the method of atomic layer deposition, Titanium tetrakis (dimethylamide) and deionized water are used as precursors, and the source heating temperature is controlled at 105°C and 45°C, respectively. The reaction temperature, that is, the substrate temperature is set to 150°C, and after 50 cycles of growth on a clean sponge, it is taken out to obtain a TiO-coated 2 nano film sponge;

[0034] (2) will cover TiO 2 The sponge of the nanometer film is placed in an alumina crucible; the alumina crucible is placed in a tube furnace, and oxygen is introduced for heat treatment. Raise the temperature at a heating rate of 10 °C / min, the burning temperature is 500 °C, the holding time is 3 hours, and the flow rate of oxygen is 0.6 liters / min; after the sample is naturally cooled, take it out, and place the sample in acetone, alcohol and After ultrasonic cleaning in deionized water, a large numb...

Embodiment 2

[0037] (1) Growth of TiO on a clean sponge by atomic layer deposition 2 nano film;

[0038] In the atomic layer deposition method, Titanium tetrakis (dimethylamide) and deionized water are used as precursors, and the temperatures are controlled at 105°C and 45°C, respectively. The reaction temperature, that is, the substrate temperature is set to 150 °C, and after 200 cycles of growth on a clean sponge, it is taken out to obtain the coated TiO 2 nano film sponge;

[0039] (2) will cover TiO 2 The sponge of the nanometer film is placed in an alumina crucible; the alumina crucible is placed in a tube furnace, and oxygen is introduced for heat treatment. Raise the temperature at a heating rate of 10°C / min, the burning temperature is 500°C, the holding time is 3 hours, and the oxygen flow rate is 0.6 liters / min; after the sample is naturally cooled, take it out, and place the sample in acetone, alcohol and Ultrasonic cleaning in deionized water can obtain a large number of two...

Embodiment 3

[0044] (1) Growth of TiO on a clean sponge by atomic layer deposition 2 nano film;

[0045] In the atomic layer deposition method, Titanium tetrakis (dimethylamide) and water are used as precursors, and the temperatures are controlled at 105°C and 45°C, respectively. The reaction temperature, that is, the substrate temperature is set to 150 °C, and after 400 cycles of growth on a clean sponge, it is taken out to obtain the coated TiO 2 nano film sponge;

[0046] (2) will cover TiO 2 The sponge of the nanometer film is placed in an alumina crucible; the alumina crucible is placed in a tube furnace, and oxygen is introduced for heat treatment. Raise the temperature at a heating rate of 10°C / min, the burning temperature is 500°C, the holding time is 3 hours, and the oxygen flow rate is 0.4 liters / min; after the sample is naturally cooled, take it out, and place the sample in acetone, alcohol and After ultrasonic cleaning in deionized water, a large number of two-dimensional n...

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Abstract

The invention belongs to the technical field of electrochemistry, and in particular relates to a two-dimensional nanometer thin film negative electrode material of a lithium ion battery and a preparation method of the negative electrode material. The problems of abrupt capacity attenuation and poor stability of a TiO2 negative electrode during large-current charge and discharge are solved by preparing a TiO2 two-dimensional nanometer structure. The preparation method comprises the following steps of growing a TiO2 nanometer thin film on a sponge by an atomic layer deposition method; and performing thermal treatment on the sponge coated with the TiO2 nanometer thin film to remove the sponge so as to obtain a TiO2 two-dimensional nanometer thin film after deposition frequency is reached, wherein the thin film is used for a negative electrode of the lithium ion battery. By simply changing the deposition frequency, the nanometer thin films with different thicknesses can be obtained. The preparation method has the advantages of simplicity in process, high repeatability and high yield. The negative electrode material of the lithium ion battery, prepared according to the method, has the advantages of structural stability and good cycle performance.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a two-dimensional nanometer film lithium-ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are the most important energy storage and conversion devices at present. They have the characteristics of high working voltage, high energy density, and long cycle life, and have been widely used in portable electronic devices. The rapid development of electric vehicles and smart grids has put forward higher requirements for lithium-ion batteries, especially the safety and stability of lithium-ion batteries. Traditional carbon-based anode materials, such as graphite, have a low discharge platform, abundant content, and low price. However, due to the capacity fading caused by the volume expansion of graphite during the cycle, and the safety hazards caused by dendrite formation and electrolyte de...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M10/0525H01M4/1391B82Y40/00
CPCB82Y40/00H01M4/1391H01M4/483H01M10/0525Y02E60/10
Inventor 黄高山赵宇婷梅永丰
Owner FUDAN UNIV
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