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Carbon-coated ferroferric oxide and preparation method and application of carbon-coated ferroferric oxide in lithium battery

A carbon-coated ferric tetroxide and carbon-coated technology, used in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor conductivity, loss of electrical contact, and reduced reaction reversibility.

Inactive Publication Date: 2013-05-22
XIAN INTAIN NEW ENERGY MATERIALS SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since M x o y The essential defect of the lithium-ion battery is still unable to obtain practically applicable metal oxide anode materials
The main reasons are: (1) M x o y Poor electrical conductivity, low electronic or ionic conductivity, and the reversibility of the reaction decreases too quickly; (2) M x o y Repeatedly reacting with Li will cause volume expansion, which will eventually lead to pulverization and cause it to lose electrical contact with the current collector and lose capacity; (3) M x o y Agglomeration will occur during the repeated reaction with Li, and the M involved in the electrode reaction x o y will continue to decrease; (4) M x o y Lithium will be irreversibly consumed by side reactions with the electrolyte

Method used

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  • Carbon-coated ferroferric oxide and preparation method and application of carbon-coated ferroferric oxide in lithium battery
  • Carbon-coated ferroferric oxide and preparation method and application of carbon-coated ferroferric oxide in lithium battery
  • Carbon-coated ferroferric oxide and preparation method and application of carbon-coated ferroferric oxide in lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 Fe 3 o 4 Preparation of C composites

[0020] (1) Add 0.40 g FeCl 3 ?6H 2 O, 0.12 g NH 4 Ac and 0.75 g PVP were dissolved in 30 ml deionized water and then transferred to a 50 ml hydrothermal reactor;

[0021] (2) Transfer the reactor to a constant temperature oven, react at 140 °C for 24 h, and then cool down to room temperature naturally;

[0022] (3) Centrifuge the product obtained in step (2) and wash with distilled water and ethanol 10 times until the supernatant is clarified;

[0023] (4) Collect the product of step (3) and dry it in a vacuum oven at 60 °C for 10 h to obtain Fe 2 o 3 red powder;

[0024] (5) Weigh 0.05 g of the product obtained in step (4) and spread it evenly in a quartz boat, put the quartz boat into the middle of a quartz tube with an inner diameter of 60 mm, and place the quartz tube in a tube furnace. The temperature was raised to 550 °C under an argon atmosphere of 100 ml / min;

[0025] (6) After the internal temperature o...

Embodiment 2

[0028] By making the CR2430 type button cell and using the LAND CT2001A type charge and discharge test system to carry out the electrochemical performance test of the sample in Example 1, the specific steps are as follows:

[0029] (1) Evenly mix the sample, conductive agent acetylene black and binder polytetrafluoroethylene emulsion according to the ratio of 50:30:20 to make a slurry;

[0030] (2) The above-mentioned slurry is rolled and compacted multiple times by a pair of rollers to obtain a sheet with a uniform thickness and a smooth surface, which is processed by punching to obtain a disc with a diameter of 14 mm;

[0031] (3) Use a tablet press (pressure of 20 MPa) to press the above disk on the copper grid of the current collector, and dry it in vacuum at 100 °C for 10 h to obtain the negative electrode sheet;

[0032] (4) In an inert atmosphere glove box, use the CR2430 button battery shell as the battery shell, stack it in the order of positive electrode (lithium met...

Embodiment 3

[0035] Example 3: Similar to Example 1, the difference is that in step (5), the temperature was raised to 600°C under an argon atmosphere, and the flow rate of acetylene was 1 ml / min. After 50 charge-discharge reactions, the final electrode material was The cycle life was stable at 970 mAh / g.

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Abstract

The invention discloses a carbon-coated ferroferric oxide. The carbon coating quantity is 5-40%, and the carbon-coated ferroferric oxide is prepared by introducing an acetylene gas into Fe2O3 under Ar atmosphere at 500-700 DEG C so as to carry out reduction and carbon coating of Fe2O3, wherein the flow velocity ratio of Ar to acetylene is 100:(1-10), thereby obtaining a carbon-coated Fe3O4 composite material. The invention aims at overcoming the defect of FexOy and conducting carbon coating on FexOy. Due to the carbon coating, not only the direct contact of the active material FexOy and electrolyte overcome can be prevented and the conductivity of FexOy is improved, but also defects of volume expansion effects, the agglomeration easiness and the like of FexOy and the electrolyte are suppressed, so that the lithium storage characteristic of FexOy is improved, and the height ratio capacity characteristic of FexOy is fully exerted.

Description

technical field [0001] The invention relates to the preparation of carbon-coated metal oxide composite electrode materials for lithium ion batteries, in particular to a carbon-coated Fe 3 o 4 Preparation method of electrode material. Background technique [0002] Due to the advantages of high energy density, long cycle life, strong charge retention and environmental friendliness, lithium-ion batteries are widely used in various portable electronic devices, electric vehicles, aerospace, solar power generation and energy storage and other fields. At present, graphite-based carbon materials are mostly used as anode materials for commercial lithium-ion batteries, but due to the problems of low specific capacity (the theoretical capacity of graphite is 372 mAh / g) and too fast cycle attenuation during use of such materials, this greatly limits Its application in high energy density power lithium battery. Considering the good economic effects, social benefits and strategic signi...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 王惠白晋涛王刚王贝贝
Owner XIAN INTAIN NEW ENERGY MATERIALS SCI & TECH
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