A preparation method of zinc lithium titanate/carbon nanocomposite negative electrode material for lithium ion battery

A lithium-ion battery, carbon nanocomposite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of easy formation of SEI film, poor cycle stability, weak electrical conductivity, etc., to achieve good electrochemical performance and improve electrical conductivity. Performance, the effect of reducing side reactions

Active Publication Date: 2021-10-15
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a preparation method of lithium zinc titanate / carbon nanocomposite negative electrode material for lithium ion batteries, which solves the problems of high energy consumption and easy formation of SEI film in existing carbon negative electrode materials. , easy to explode, long reaction time, poor cycle life, poor cycle stability and weak conductivity, etc.

Method used

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  • A preparation method of zinc lithium titanate/carbon nanocomposite negative electrode material for lithium ion battery
  • A preparation method of zinc lithium titanate/carbon nanocomposite negative electrode material for lithium ion battery
  • A preparation method of zinc lithium titanate/carbon nanocomposite negative electrode material for lithium ion battery

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Effect test

Embodiment 1

[0041] 1) Weigh 0.03mol CTAB and dissolve it in a beaker containing 200mL deionized water, then weigh 0.005mol Li 2 CO 3 and 0.005mol Zn(CH 3 COO) 2 • 2H 2 O was added to the beaker and magnetically stirred for 30 min to obtain a mixed solution. Weigh 0.015mol C 16 h 36 o 4 Ti was diluted with an equal volume of absolute ethanol, slowly added to the above mixed solution, and ultrasonically treated for 20 minutes;

[0042] 2) Put the beaker into the oil bath and heat up to 60°C and stir for 2 hours, then heat up to 80°C and stir for 4 hours until the water in the sol evaporates and gel appears. Take out the beaker and let it stand for 12 hours, then put the beaker containing the wet gel in the Dry in an oven at 110°C 2 ZnTi 3 o 8 Precursor of / C;

[0043] 3) will Li 2 ZnTi 3 o 8 / C precursor is ground to nanometer size, and then Li 2 ZnTi 3 o 8 / C powder is evenly placed in a quartz boat and placed in a microwave tube furnace. In an argon atmosphere, it is trea...

Embodiment 2

[0045] 1) Weigh 0.03mol soluble starch and dissolve it in a beaker containing 200mL deionized water, then weigh 0.005mol Li 2 CO 3 and 0.005mol Zn(CH 3 COO) 2 • 2H 2 O was added to the beaker, and magnetically stirred for 30 min to obtain a mixed solution. Weigh 0.015mol C 16 h 36 o 4 Ti was diluted with an equal volume of absolute ethanol, slowly added to the above mixed solution, and ultrasonically treated for 20 minutes;

[0046] 2) Put the beaker into the oil bath and heat up to 60°C and stir for 2 hours, then heat up to 80°C and stir for 4 hours until the water in the sol evaporates and gel appears. Take out the beaker and let it stand for 12 hours, then put the beaker containing the wet gel in the Dry in an oven at 110°C 2 ZnTi 3 o 8 Precursor of / C;

[0047] 3) will Li 2 ZnTi 3 o 8 / C precursor is ground to nanometer size, and then Li 2 ZnTi 3 o 8 / C powder is evenly placed in a quartz boat and placed in a microwave tube furnace. In an argon atmosphere,...

Embodiment 3

[0049] 1) Weigh 0.03mol glucose and dissolve it in a beaker containing 200mL deionized water, then weigh 0.005mol Li 2 CO 3 and 0.005mol Zn(CH 3 COO) 2 • 2H 2 O was added to the beaker, and magnetically stirred for 30 min to obtain a mixed solution. Weigh 0.015mol C 16 h 36 o 4 Ti was diluted with an equal volume of absolute ethanol, slowly added to the above mixed solution, and ultrasonically treated for 20 minutes;

[0050] 2) Put the beaker into the oil bath and heat up to 60°C and stir for 2 hours, then heat up to 80°C and stir for 4 hours until the water in the sol evaporates and gel appears. Take out the beaker and let it stand for 12 hours, then put the beaker containing the wet gel in the Dry in an oven at 110°C 2 ZnTi 3 o 8 Precursor of / C;

[0051] 3) will Li 2 ZnTi 3 o 8 / C precursor is ground to nanometer size, and then Li 2 ZnTi 3 o 8 / C powder is evenly placed in a quartz boat and placed in a microwave tube furnace. In an argon atmosphere, it is ...

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Abstract

The invention discloses a method for preparing a lithium zinc titanate / carbon nanocomposite negative electrode material for a lithium ion battery. Firstly, a lithium source, a titanium source, a zinc source and a carbon source are subjected to a liquid phase reaction to form a metal complex, and then heated in an oil bath. The precursor gel is obtained, and then the composite negative electrode material of the lithium ion battery is obtained by microwave treatment. Adopting the method of the present invention to prepare carbon-coated lithium zinc titanate not only has low energy consumption, short reaction time, and uniform particle size, but also has excellent electrochemical properties of batteries made of it as negative electrode active materials, at 100mA / g The cycle performance test was carried out under the current density. The initial value of the capacity of the lithium zinc titanate battery reached 238.3mAh / g. After 10 cycles, the specific capacity was still around 240mAh / g, and the electrochemical performance was maintained very well. Application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium zinc titanate / carbon nanocomposite negative electrode material for lithium ion batteries. Background technique [0002] With the rapid development of current science and technology, all kinds of new smart technology devices have begun to enter people's daily life. Among the various components of smart devices, batteries have become an important part that restricts their development. With the rapid development in recent years, people have put forward higher and higher requirements for the miniaturization, high energy, service life, and fast charging of batteries for electronic products. Traditionally used lead-acid batteries, nickel-chromium batteries and nickel-metal hydride batteries, etc., cannot meet people's requirements for portable device batteries due to their large volume, low energy density, toxicity and harmfu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M10/0525
CPCY02E60/10
Inventor 陈建林小力廖明东辜其隆闵丹刘孟轩蒋记张思艺
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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