Shuttle-shaped zinc ferrite/carbon lithium ion battery nanometer composite negative electrode material and preparation method and application thereof

A lithium-ion battery and nanocomposite technology, applied in the field of electrochemistry, can solve the problems of too fast specific capacity decay, poor conductivity, low theoretical capacity, etc., and achieve the effects of improving cycle stability, easy process control, and improving rate performance.

Active Publication Date: 2018-01-19
SOUTH CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0006] In view of the shortcomings of the current traditional commercial lithium-ion battery graphite negative electrode materials such as low theoretical capacity, poor conductivity of transition metal oxide negative electrode materials, and rapid decay of specific capacity during battery charging and discharging cycles, the present invention proposes a shuttle-shaped zinc ferrite / Carbon lithium-ion battery nanocomposite negative electrode material and its preparation method and application can improve the structural stability and electrochemical performance of lithium-ion battery negative electrode material, and improve the cycle stability and rate performance of the material in the process of charging and discharging

Method used

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  • Shuttle-shaped zinc ferrite/carbon lithium ion battery nanometer composite negative electrode material and preparation method and application thereof
  • Shuttle-shaped zinc ferrite/carbon lithium ion battery nanometer composite negative electrode material and preparation method and application thereof
  • Shuttle-shaped zinc ferrite/carbon lithium ion battery nanometer composite negative electrode material and preparation method and application thereof

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Embodiment 1

[0038] (1) Weigh 1.8571 g of fumaric acid (C 4 h 4 o 4 , 99.0 %) was added to 20 mL of dimethylformamide (HCON(CH 3 ) 2 , AR), after 2 hours of magnetic stirring and mixing at a rate of 750 rpm, a transparent dispersion was obtained. Then weigh 0.4040g ferric nitrate (Fe(NO 3 ) 3 9H 2 O, 98.5%) and 0.1487 g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O, 99.0%) was added to the above-mentioned dispersion liquid, stirred at the same speed of 750 rpm for 3 hours, mixed evenly, transferred to a 50 mL sealed steel shell of a hydrothermal kettle, and heated in an electric constant temperature blast drying oven at 100 °C The reaction was carried out at the temperature for 12 h. After cooling down to room temperature, the hydrothermal reaction product was separated from solid and liquid, and the obtained solid was washed twice with absolute ethanol, then once with dimethylformamide, and finally twice with absolute ethanol. The washing process is all realized by centrifugation at 8000 r...

Embodiment 2

[0048] (1) Weigh 1.8571 g of fumaric acid (C 4 h 4 o 4 , 99.0 %) was added to 20 mL of dimethylformamide (HCON(CH 3 ) 2 , AR), after stirring and mixing at 750 rpm for 3 hours, a transparent dispersion was obtained. Then weigh 0.8080 g ferric nitrate (Fe(NO 3 ) 3 9H 2 O, 98.5%) and 0.2974 g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O, 99.0%) was added to the above-mentioned dispersion liquid, stirred at the same speed of 750 rpm for 3 hours, mixed evenly, transferred to a 50 mL sealed steel shell of a hydrothermal kettle, and heated in an electric constant temperature blast drying oven at 100 °C The reaction was carried out at the temperature for 10 h. After cooling down to room temperature, the hydrothermal reaction product was separated from solid and liquid, and the obtained solid was washed twice with absolute ethanol, then once with dimethylformamide, and finally twice with absolute ethanol. The washing process is all realized by centrifugation at 8000 rpm for 2 min, and...

Embodiment 3

[0054](1) Weigh 3.7142 g of fumaric acid (C 4 h 4 o 4 , 99.0 %) was added to 40 mL of dimethylformamide (HCON(CH 3 ) 2 , AR), after stirring and mixing at 750 rpm for 2 hours, a transparent dispersion was obtained. Then weigh 0.8080 g ferric nitrate (Fe(NO 3 ) 3 9H 2 O, 98.5%) and 0.2974 g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O, 99.0%) was added to the above-mentioned dispersion liquid, stirred at the same speed of 750 rpm for 3 hours, mixed evenly, transferred to a 50 mL sealed steel shell of a hydrothermal kettle, and heated in an electric constant temperature blast drying oven at 150 ℃ The reaction was carried out at the temperature for 12 h. After the temperature is lowered to room temperature, the hydrothermal reaction product is separated from the solid and liquid, and the obtained solid is first washed with absolute ethanol for 3 times, then washed with dimethylformamide for 2 times, and finally washed with absolute ethanol for 3 times. The washing process is all ...

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Abstract

The invention discloses a shuttle-shaped zinc ferrite/carbon lithium ion battery nanometer composite negative electrode material and a preparation method and an application thereof. The composite negative electrode material adopts a shuttle structure, and is formed by a carbon framework and secondary zinc ferrite nanoparticles in a composite manner, wherein the zinc ferrite accounts for 60-90mass%of the zinc ferrite/carbon lithium ion battery nanometer composite negative electrode material; the preparation method comprises the steps of taking an organic metal framework as a linker and a carbon source, performing mixing with a metal salt to be subjected to a hydrothermal reaction, and performing centrifuging, washing and drying to obtain a precursor; and next, performing an annealing reaction to obtain the shuttle-shaped zinc ferrite/carbon lithium ion battery nanometer composite negative electrode material. The prepared shuttle-shaped zinc ferrite/carbon lithium ion battery nanometercomposite negative electrode material is stable in structure, high in conductivity, and shows excellent cycle stability and rate capability when the material is used as the lithium ion battery negative electrode; and in addition, the method is simple in operation, convenient to control, low in cost, environment friendly, and suitable for industrial large scale production and capable of realizing actual application of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a nano-composite negative electrode material for a shuttle-shaped zinc ferrite / carbon-lithium ion battery and a preparation method and application thereof. Background technique [0002] With the increasing demand for energy in the current society, it has led to increasingly serious energy crisis and environmental problems, which has stimulated people's continuous research on new energy and energy storage and conversion technologies. At the end of the 20th century, Sony's successful commercialization of lithium-ion batteries has attracted the attention of most people. With its unique advantages in energy storage and conversion, it has also been used in computers, mobile phones and other electronic devices. However, with the further development of electric vehicles and energy storage technology, higher requirements are put forward for lithium-ion batteries, which require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/583
CPCY02E60/10
Inventor 蒋仲杰程思
Owner SOUTH CHINA UNIV OF TECH
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