Organic acid modified Si/TiO2/rGO@C lithium ion battery negative electrode material as well as preparation method and application thereof

A technology of lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve unsatisfactory problems, and achieve easy industrial production, low synthesis cost, and high capacity The effect of retention

Active Publication Date: 2018-11-30
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two methods can improve the performance of silicon-based materials to a certain extent, they still cannot meet the actual requirements.

Method used

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  • Organic acid modified Si/TiO2/rGO@C lithium ion battery negative electrode material as well as preparation method and application thereof
  • Organic acid modified Si/TiO2/rGO@C lithium ion battery negative electrode material as well as preparation method and application thereof
  • Organic acid modified Si/TiO2/rGO@C lithium ion battery negative electrode material as well as preparation method and application thereof

Examples

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preparation example Construction

[0034] Organic acid modified Si / TiO of the present invention 2 The preparation method of / rGO@C lithium ion battery anode material includes the following steps:

[0035] S0: Use the modified Hummer method to prepare graphene oxide (GO), then add GO to a dispersion medium such as ethanol, and then perform ultrasonic dispersion treatment to make a GO dispersion with a concentration of 0.1-5 mg / mL, and then use a cell crusher To process the GO dispersion, the processing power of the ultrasonic cell pulverizer is 0-900W, and the processing time is 5-20min.

[0036] S1: According to the mass ratio of 1:(1~5), the nano titanium dioxide (TiO 2 ) And silicon (Si) powder are added to a dispersion medium such as an ethanol solution, and then subjected to ultrasonic dispersion treatment, and then ball milling. The nano TiO 2 It is an anatase type with a particle size of 5-20 nm, and the particle size of the Si is nano-scale 30-200 nm or commercial micron-scale 5-100 μm.

[0037] S2: Add the GO...

Embodiment 1

[0048] In this example, Si / TiO modified with organic acid was prepared 2 The specific steps of / rGO@C lithium ion battery anode material are as follows:

[0049] S0: Prepare GO by the modified Hummer method: add 0.6g of flake graphite to a 200mL beaker containing 23mL of concentrated sulfuric acid, stir for 30min in an ice bath, and then slowly add 2.4g of KMnO 4 , Keep stirring for 1 hour and then heat in a water bath. After the temperature rises to 40℃, continue to stir for 30 minutes, slowly add deionized water to dilute to 50-60 mL, stir for 30 minutes and add appropriate amount of H 2 O 2 After stirring for 30 minutes, the obtained solution was washed by centrifugation and dried for 24 hours to obtain GO. Then GO was added to ethanol, and then subjected to ultrasonic dispersion treatment to make a uniform GO dispersion with a concentration of 1 mg / mL, and then the GO dispersion was treated with a cell pulverizer for 10 minutes before use.

[0050] S1: Weigh 2g of nano-Si with a...

Embodiment 2

[0057] In this example, Si / TiO modified with organic acid was prepared 2 The specific steps of / rGO@C lithium ion battery anode material are as follows:

[0058] S0: Prepare GO by the modified Hummer method: add 0.6g of flake graphite to a 200mL beaker containing 23mL of concentrated sulfuric acid, stir for 30min in an ice bath, and then slowly add 2.4g of KMnO 4 , Keep stirring for 1 hour and then heat in a water bath. After the temperature rises to 40℃, continue to stir for 30 minutes, slowly add deionized water to dilute to 50-60 mL, stir for 30 minutes and add appropriate amount of H 2 O 2 After stirring for 30 minutes, the obtained solution was washed by centrifugation and dried for 24 hours to obtain GO. Then GO was added to ethanol, and then subjected to ultrasonic dispersion treatment to make a uniform GO dispersion with a concentration of 1 mg / mL, and then the GO dispersion was treated with a cell pulverizer for 10 minutes before use.

[0059] S1: Weigh 2g of nano-Si with a...

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Abstract

The invention relates to an organic acid modified Si/TiO2/rGO@C lithium ion battery negative electrode material as well as a preparation method thereof. The preparation method comprises the followingsteps: S1: adding powder of nano titanium dioxide and silicon into a dispersed medium, performing the ultrasonic dispersion treatment, and ball milling; S2: adding dispersion liquid of graphene oxideinto a mixture obtained in step S1, and ball milling; S3: adding an organic carbon source into the mixture obtained in step S2, stirring, and ball milling; S4: centrifuging and drying the mixture obtained in step S3 to obtain a Si/TiO2/GO/C composite; S5: in an inert atmosphere, calcining the Si/TiO2/GO/C composite obtained in step S4 at 350 to 450 DEG C to obtain the negative electrode material.The invention also relates to application of the negative electrode material in a lithium ion battery negative plate. The preparation method has the advantages of simplicity and convenience in operation, low cost, easy industrialized production and the like; and the obtained negative electrode material is excellent in comprehensive performance, high in capacity retention rate and stable charging-discharging circulation performance.

Description

Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an organic acid modified Si / TiO 2 / rGO@C Lithium-ion battery anode material and its preparation method and application. Background technique [0002] With the widespread popularity of smart phones, laptop computers, new energy vehicles, etc., large-capacity lithium-ion batteries are widely used because of their high specific energy, high voltage, low self-discharge, long cycle life, no memory effect, and low environmental pollution. In related fields such as electronic equipment and energy equipment, it has become a better choice for solving energy storage and conversion problems. As an important part of the lithium-ion battery, the negative electrode material seriously affects the overall performance of the battery. Nowadays, the widely used commercial anode material is graphite anode material, but its theoretical specific capacity is only 372mAh / g, and its rate perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCH01M4/362H01M4/366H01M4/386H01M4/62H01M4/625H01M10/0525B82Y30/00Y02E60/10
Inventor 汝强张芃闫弘麟
Owner SOUTH CHINA NORMAL UNIVERSITY
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