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A kind of fluorocarbon-doped ferric iron tetroxide used as negative electrode material of lithium battery and preparation method thereof

A technology of triiron tetroxide and hollow triiron tetroxide, which is applied in the direction of battery electrodes, ferrous oxides, iron oxide/iron hydroxide, etc., can solve the problem of affecting the cycle performance and application of materials, and the current collector loses electrical contact , Difficult lithium-ion batteries and other issues, to achieve good industrial application prospects, excellent specific capacity performance, and expand the effect of application range

Active Publication Date: 2016-03-30
浙江星岳电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many scholars at home and abroad have studied the application of these metal oxides as negative electrode materials in lithium batteries from different aspects. Although this type of material has great market application value, it has a great role in the actual commercial lithium-ion battery application. limitations, it is difficult to be practically applied to commercial lithium-ion batteries
First of all, due to the large volume expansion and contraction changes of such materials during the intercalation and extraction of lithium ions, the pulverization of the active material and the loss of electrical contact with the current collector have greatly affected the performance of such materials. Cycle performance and application
Second, these materials have poor electronic conductivity compared with conventional graphite anode materials

Method used

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  • A kind of fluorocarbon-doped ferric iron tetroxide used as negative electrode material of lithium battery and preparation method thereof
  • A kind of fluorocarbon-doped ferric iron tetroxide used as negative electrode material of lithium battery and preparation method thereof
  • A kind of fluorocarbon-doped ferric iron tetroxide used as negative electrode material of lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of Fe3O4 material: Add 800mL of deionized water to a 1L beaker, add 10.8g of Ferric Chloride, 23.5g of Sodium Citrate and 7.2g of urea under magnetic stirring conditions, and stir After half an hour, after all the added substances are dissolved, then weigh 6g of polyacrylamide and slowly add it to the above solution, continue to stir for one and a half hours, then transfer the mixed solution to the reaction kettle, and react at 200°C for 12h. Take out the reaction kettle, wash it repeatedly with deionized water and absolute ethanol after the reaction is cooled, and finally dry it overnight in a vacuum oven at 70°C to obtain hollow iron ferric oxide.

[0031]Preparation of carbon layer-coated porous and hollow iron ferric oxide: add the obtained hollow ferric iron tetroxide to 400mL of 0.5M glucose aqueous solution, and after it is completely dissolved, transfer the solution to a 1000mL reaction kettle. Reaction at 180°C for 6h. Take out the reaction kettle,...

Embodiment 2

[0037] The preparation of the ferroferric oxide material is the same as in Example 1, except that the sample mixed with polyvinylidene fluoride is burned at 420° C. for 4 hours.

[0038] The battery performance test method is the same as that in Example 1, and the discharge specific capacity of the obtained battery after charging and discharging for 50 cycles at a rate of 0.1C is 820mAh / g.

Embodiment 3

[0040] The preparation of the ferroferric oxide material is the same as in Example 1, except that the sample mixed with polyvinylidene fluoride is burned at 450° C. for 4 hours.

[0041] The battery performance test method is the same as that of Example 1, and the discharge specific capacity of the obtained battery after charging and discharging for 50 cycles at a rate of 0.1C is 860mAh / g.

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Abstract

The invention provides a fluorocarbon-doped ferroferric oxide used as a lithium battery anode material and a preparation method thereof. The fluorocarbon-doped ferroferric oxide is of a hollow or porous nanometer structure. As a lithium battery electrode material, the fluorocarbon-doped ferroferric oxide has a specific capacity being not lower than 900mAh / g after 100 times of charge-discharge. When the fluorocarbon-doped ferroferric oxide provided by the invention is utilized as the lithium battery anode material, the property is remarkably improved; and the ferroferric oxide has a wide application prospect in the field of lithium batteries when used as the lithium battery anode material.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a fluorocarbon-doped ferric iron tetroxide used as a lithium battery negative electrode material and a preparation method thereof. Background technique [0002] In the current commercial lithium-ion battery system, graphite is mainly used as the anode material of lithium-ion batteries. However, the theoretical specific capacity of graphite-based anode materials is only 372mAh / g. Therefore, the search for new high-performance anode materials has become the focus. Prior to this, scholars from various countries mainly focused on the lithium battery system with lithium metal or alloy as the negative electrode. Although metal lithium has the advantages of high energy density and high voltage, it will cause uneven deposition of lithium metal on the negative electrode during charging, thereby forming dendrite lithium. When accumulated to a certain extent, dendritic lithium continues to grow du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/1315H01M4/13915H01M4/1393H01M4/1391
CPCC01G49/08H01M4/52H01M10/0525Y02E60/10
Inventor 顾宏伟耿洪波
Owner 浙江星岳电子科技有限公司
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