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Carbon cladded ferriferrous oxide negative electrode material of lithium ion battery and preparation method thereof

A carbon-coated ferric oxide and lithium-ion battery technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of poor particle size uniformity of nanoparticles, time-consuming and labor-intensive steps, and complicated steps, and achieve the degree of graphitization High, simple operation, good dispersion effect

Inactive Publication Date: 2012-11-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on the above documents, it is found that the above-mentioned pyrolysis methods all adopt a multi-step method, that is, firstly prepare Fe 2 o 3 / Fe 3 o 4 Nanoparticles or carbon precursors, and then the precursors mixed with iron sources and carbon sources were calcined to obtain carbon-coated Fe 3 o 4 Composite materials, the steps are complicated, time-consuming and labor-intensive; and the obtained Fe 3 o 4 The particle size uniformity of nanoparticles is poor, and the yield is still small

Method used

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  • Carbon cladded ferriferrous oxide negative electrode material of lithium ion battery and preparation method thereof
  • Carbon cladded ferriferrous oxide negative electrode material of lithium ion battery and preparation method thereof
  • Carbon cladded ferriferrous oxide negative electrode material of lithium ion battery and preparation method thereof

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Embodiment 1

[0026]Weigh 1.2g of glucose, 0.808g of ferric nitrate and 11.1g of NaCl, dissolve the mixture in 50ml of deionized water, stir and dissolve with a magnetic stirrer at a stirring speed of 300r / min to form a solution, and then use a 400W ultrasonic Sonicate for 15 minutes and mix well. Put the mixed solution into a vacuum drying oven at 80° C. for vacuum drying until a mixture is obtained. Grind the mixture, take 6g of the mixed powder and place it in the ark, put the ark in a tube furnace, and under the protection of Ar inert gas with a flow rate of 200ml / min, heat up to a temperature of 300°C at a heating rate of 10°C / min. After decomposing the source, keep it warm for 2 hours; then continue to pass in the Ar inert gas with a flow rate of 200ml / min, and raise the temperature to 750°C at a heating rate of 10°C / min, keep it warm for 2h for carbonization, and cool it under the protection of Ar atmosphere after the reaction to room temperature to obtain a calcined product. Colle...

Embodiment 2

[0029] In this embodiment, carbon coated Fe 3 o 4 The preparation process of the nanoparticles and the battery preparation process are the same as the first step of the embodiment, except that the calcination temperature is changed from 750°C to 700°C. The prepared lithium-ion battery was charged and discharged on the Blue Electric CT2001A battery tester. After 30 cycles at 1C (current density 24.5mA / g), the battery discharge specific capacity was 522mAhg -1 , after 100 cycles at 2C (current density 49mA / g), the discharge specific capacity of the battery is 181mAhg -1 , after 50 cycles at 5C (current density 122.5mA / g), the discharge specific capacity of the battery is 72mAhg -1 , its charge and discharge test curve is as follows Figure 8 shown. Utilize the electrochemical workstation that model is CHI660D to carry out cyclic voltammetry test to the battery that makes then, the voltage range of scanning is 0.01-3V, and scanning speed is 0.005mV, and scanning cycle is 5 ti...

Embodiment 3

[0031] Weigh 5g of sucrose, 0.808g of ferric nitrate and 11.1g of NaCl, dissolve the mixture in 50ml of deionized water, stir and dissolve with a magnetic stirrer at a stirring speed of 300r / min to form a solution, and then sonicate with a 400W ultrasonic device 15min, mix well. Put the mixed solution into a vacuum drying oven at 80° C. for vacuum drying until a mixture is obtained. Grind the mixture, take 6g of the mixed powder and place it in the ark, put the ark into the tube furnace, first pass 400ml / min of Ar inert gas to remove the air, then use 400ml / min of Ar inert gas, and at 10°C / min The heating rate of min is raised to 400°C for carbon source decomposition, and after holding for 1 hour; then continue to pass in Ar inert gas with a flow rate of 400ml / min, and raise the temperature to 750°C at a heating rate of 10°C / min, and hold for 2 hours. Carbonization, after the reaction is completed, it is cooled to room temperature under the protection of Ar atmosphere to obta...

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Abstract

The invention discloses a carbon cladded ferriferrous oxide negative electrode material of a lithium ion battery and a preparation method thereof. The negative electrode material is a carbon cladded Fe3O4 composite material and has a particle size in a range of 1 to 100 nm. The preparation method comprises the following steps: with NaCl used as a dispersing agent and a supporter, fully mixing NaCl with a metal oxide source and a solid carbon source; drying an obtained mixed solution under vacuum to obtain a mixture; placing the mixture into a tubular furnace for calcination in an inert atmosphere so as to obtain a calcined product; and rinsing and grinding the calcined product to obtain carbon cladded metal oxide nanometer particles. The method is safe and non-toxic and is simple to operate; during charging and discharging tests of a lithium ion button cell made of the carbon cladded ferriferrous oxide negative electrode material, discharge specific capacity can be maintained at 620 to 900 mAh / g after 30 cycles of charging and discharging at a current of 0.1C (with current density being 92 mA / g), and discharge specific capacity can be maintained at 600 to 760 mAh / g after 50 cycles of charging and discharging at a current of 1C (with current density being 920 mA / g); and the negative electrode material of the lithium ion battery has high reversible capacity and good cycling stability.

Description

technical field [0001] The invention relates to a carbon-coated iron ferric oxide lithium ion battery negative electrode material and a preparation method thereof, belonging to the field of lithium ion secondary battery electrode materials. Background technique [0002] Lithium-ion secondary batteries have the characteristics of high voltage, high specific energy, wide operating temperature range, low self-discharge rate, no memory effect, and no environmental pollution. Compared with nickel-cadmium and nickel-hydrogen batteries, they have a longer cycle life and better safety performance . Therefore, lithium-ion batteries have partially replaced other power sources at present, and are used in portable devices such as mobile phones, notebook computers, video cameras, cameras, etc., and will be widely used in military fields such as electric vehicles, satellites, and aerospace in the future. [0003] The carbon anode materials (natural graphite, artificial graphite) currentl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/52
CPCY02E60/12Y02E60/10
Inventor 何春年吴珊赵乃勤师春生刘恩佐
Owner TIANJIN UNIV
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