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Preparation method of ferric oxide/carbon nanotube lithium ion battery anode material

A lithium-ion battery, ferric oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of not being able to provide the conductive volume effect of iron oxide, difficult to obtain rate performance and cycle performance, and unable to achieve large-scale production. and other problems, to achieve the effect of improving cycle performance and stability, good rate performance and cycle performance, and electrical conductivity.

Inactive Publication Date: 2015-04-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these preparation methods are complex and cannot be mass-produced
At the same time, since iron oxide is directly exposed to the electrolyte, and carbon nanotube powder cannot provide a continuous and effective network to improve the conductivity of iron oxide and alleviate the volume effect, it is difficult for this type of material to achieve high rate performance and cycle performance.

Method used

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  • Preparation method of ferric oxide/carbon nanotube lithium ion battery anode material
  • Preparation method of ferric oxide/carbon nanotube lithium ion battery anode material
  • Preparation method of ferric oxide/carbon nanotube lithium ion battery anode material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Weigh 25g of ethanol as a carbon source and 0.25g of ferrocene as a catalyst, and add 0.2g of thiophene as a promotor, mix and sonicate for 30min; obtain a uniform precursor solution; wherein carbon source ethanol and catalyst ferrocene The mass ratio of iron is 100:1;

[0027] (2) A vertical furnace is used as the reactor. The reactor is heated to 1100°C under the protection of argon and then kept warm. The carrier gas is replaced by argon with hydrogen (the gas flow rate is 600 sccm), and then the prepared precursor solution is 8mL h -1 The rate is injected into the reactor;

[0028] (3) After the reaction starts, when the cylindrical composite film is formed at the tail end of the reactor, it is drawn to the rotating shaft, thereby obtaining a uniform and continuous composite film;

[0029] (4) After the reaction, the collected composite film was heat-treated at 500°C for 2 hours in air to obtain Fe 2 o 3 / Carbon nanotube composite thin film lithium ion batt...

Embodiment 2

[0032] (1) Take by weighing 25g ethanol as carbon source and 0.5 ferrocene as catalyst, and add 0.2g of thiophene as promotor, after mixing, ultrasonic 30min; Obtain uniform precursor solution; wherein carbon source ethanol and catalyst ferrocene The mass ratio is 50:1;

[0033] (2) A vertical furnace is used as a reactor, and the reactor is heated to 1100° C. under the protection of argon and then kept warm. Replace the carrier gas argon with hydrogen and argon mixed gas (gas flow rate is 800sccm), and prepare the precursor solution with 8mL h -1 rate into the reactor.

[0034] (3) After the reaction starts, when a cylindrical composite film is formed at the end of the reactor, it is drawn to the rotating shaft to obtain a uniform and continuous composite film;

[0035] (4) After the reaction, the collected composite film was heat-treated at 500°C for 2 hours in air to obtain Fe 2 o 3 / Carbon nanotube composite thin film lithium ion battery anode material.

[0036] Unde...

Embodiment 3

[0038] (1) Weigh 25g of toluene as a carbon source and 0.5g of ferrocene as a catalyst, and add 0.2g of thiophene as a promotor, mix and sonicate for 30min; obtain a uniform precursor solution; wherein the carbon source and catalyst ferrocene The mass ratio is 50:1;

[0039] (2) A vertical furnace is used as a reactor, and the reactor is heated to 1100° C. under the protection of argon and then kept warm. Replace the carrier gas argon with hydrogen (gas flow rate is 600sccm), and prepare the precursor solution with 8mL h -1 rate into the reactor.

[0040] (3) After the reaction starts, when a cylindrical composite film is formed at the end of the reactor, it is drawn to the rotating shaft to obtain a uniform and continuous composite film;

[0041] (4) After the reaction, the collected composite film was heat-treated at 500°C for 2 hours in air to obtain Fe 2 o 3 / Carbon nanotube composite thin film lithium ion battery anode material.

[0042] Fe obtained under this condi...

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Abstract

The invention discloses a preparation method of a ferric oxide / carbon nanotube lithium ion battery anode material, which adopts a floating-catalyst chemical vapor deposition process and comprises the following steps: mixing a liquid-phase carbon source, a catalyst and an accelerator, and carrying out ultrasonic dispersion to obtain a uniform precursor solution; heating a reactor to 900-1200 DEG C in an argon environment, and keeping the temperature constant; under the driving action of a carrier gas (hydrogen or hydrogen-argon gas mixture), injecting the precursor solution into the reactor at the rate of 2-12 mL / hour to obtain a uniform and continuous composite film; and carrying out heat treatment on the composite film at 300-600 DEG C under air conditions for 1-4 hours to obtain the Fe2O3 / carbon nanotube composite film lithium ion battery anode material. The method has the advantages of simple technique and lower energy consumption, further improves the properties of the composite material, and can be widely used in the aspect of lithium ion battery electrode materials.

Description

technical field [0001] The present invention relates to lithium-ion battery electrode materials, in particular to a Fe with high electrochemical performance 2 o 3 / The preparation method of carbon nanotube lithium ion battery anode material. Background technique [0002] Iron oxide has the advantages of large specific capacity, non-toxic environmental friendliness, high safety, abundant raw material sources, and low price. Therefore, it is a class of anode materials with great development potential for lithium-ion batteries. However, like other transition metal oxides, its conductivity Poor performance (2×104S / m, 25°C), and a volume change of up to ~200% with the intercalation and extraction of lithium ions, so its electrochemical performance (including cycle stability and rate performance) is not ideal. Carbon nanotubes have good crystallinity, unique mechanical and electrical properties and structural characteristics, and can form a conductive network with superior condu...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62
CPCH01M4/36H01M4/52H01M4/625Y02E60/10
Inventor 侯峰杨德明
Owner TIANJIN UNIV
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