Preparation method of lithium zinc titanate/carbon nanometer composite 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: 2019-06-14
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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  • Preparation method of lithium zinc titanate/carbon nanometer composite negative electrode material for lithium ion battery
  • Preparation method of lithium zinc titanate/carbon nanometer composite negative electrode material for lithium ion battery
  • Preparation method of lithium zinc titanate/carbon nanometer composite negative electrode material for lithium ion battery

Examples

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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 0.015molC 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 treat...

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 preparation discloses a preparation method of a lithium zinc titanate/carbon nanometer composite negative electrode material for a lithium ion battery. The preparation methodcomprises the steps of firstly, performing liquid-phase reaction on a lithium source, a titanium source, a zinc source and a carbon source to form a metal complex, and performing oil bath heating toobtain precursor sol; and secondly, performing microwave processing to obtain the composite negative material for the lithium ion battery. Carbon-coated lithium zinc titanate prepared by the method islow in energy consumption, short in reaction time and uniform in particles; moreover, the electrochemical performance of the battery prepared by employing the carbon-coated lithium zinc titanate usedas a negative active material is excellent, and the capacity initial value of a lithium zinc titanate battery reaches 238.3mAh/g through cycle performance test under current density of 100mA/g; and after circulation for 10 times, the specific capacity is stilled maintained about 240mAh/g, the electrochemical performance is maintained very well, and the lithium zinc titanate battery has a favorable 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 Applications(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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