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Iron oxide/carbon composite lithium ion battery anode material as well as preparation method and application thereof

A carbon composite material, iron oxide technology, applied in battery electrodes, carbon preparation/purification, iron oxide/iron hydroxide, etc., to achieve the effects of improving electronic conductivity, high specific capacity, and simple and easy method.

Active Publication Date: 2013-12-11
宇恒电池股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main problem that needs to be solved is to improve the cycle performance of the material and reduce the initial irreversible capacity of the material while maintaining the high capacity characteristics of the material.

Method used

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  • Iron oxide/carbon composite lithium ion battery anode material as well as preparation method and application thereof
  • Iron oxide/carbon composite lithium ion battery anode material as well as preparation method and application thereof
  • Iron oxide/carbon composite lithium ion battery anode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Using FeCl 3 As the iron source, prepare a solution with a molar concentration of 2.2 mol / liter. The solution was heated to 100 °C, and the FeCl 3 Ammonia (15 mol / L) was added to FeCl at a molar ratio of 10:1 3 aqueous solution, and added with FeCl 3 Citric acid with a molar ratio of 3:1 will form a liquid mixture after being fully stirred. The above solution was sprayed and cracked in air at 400°C to obtain a powder precursor. Then, the powder precursor was calcined at 450° C. for 3 hours under a nitrogen atmosphere to obtain an iron oxide / carbon composite material. According to X-ray diffraction detection, the crystalline oxide in the composite material is mainly Fe 3 o 4 . According to the elemental analysis method, the carbon content in the composite material is 20% of the weight percentage of the composite material. According to diffraction analysis by transmission electron microscope, the composite material also contains amorphous iron oxide.

[0055] Pre...

Embodiment 2

[0064] Using FeCl 3 As an iron source, prepare a solution with a molar concentration of 4.0 mol / liter. At room temperature, the solution was added with FeCl 3 The molar ratio is 8:1 ammonia water (concentration is 8 mol / L), and then added with FeCl 3 The molar ratio of citric acid is 3:1, stir well to form a liquid phase mixture. The above liquid phase mixture is subjected to spray cracking in an air atmosphere at 400°C to form a powder material. Then the powder material in N 2 Under the atmosphere, the iron oxide / carbon composite material was obtained by calcining at 500° C. for 3 hours. According to X-ray diffraction detection, the crystalline oxide in the composite material is mainly Fe 3 o 4. Through transmission electron microscope energy spectrum analysis and selected area diffraction analysis of iron and oxygen-containing regions, the material contains amorphous oxides. According to elemental analysis, the carbon content in the composite material is 15% by weigh...

Embodiment 3

[0068] Using FeCl 3 As the iron source, prepare a solution with a molar concentration of 2.2 mol / liter. The solution was heated to 50°C, and FeCl was added to the solution 3 Aqueous ammonia (1.5 mol / L) at a molar ratio of 12:1 was stirred, and then added with FeCl 3 The molar ratio of citric acid is 4:1, stir well to form a liquid phase mixture. The above-mentioned liquid phase mixture is subjected to spray cracking in an air atmosphere at 300° C. to form a powder material. Then the powder material in N 2 Under the atmosphere, the iron oxide / carbon composite material was obtained by calcining at 450° C. for 3 hours. According to X-ray diffraction detection, the crystalline oxide in the composite material is mainly Fe 3 o 4 . According to elemental analysis, the carbon content in the composite material is 25% by weight of the composite material.

[0069] A simulated battery was assembled using the same method as in Example 1, and the electrochemical performance of the c...

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Abstract

The invention relates to a preparation method for iron oxide / carbon composite material. The preparation method comprises the steps as follows: 1, taking a water-soluble iron salt as an iron source, taking a water-soluble organic carbon source as a carbon source, and uniformly mixing the iron salt water solution, ammonia water with the organic carbon source to form a liquid phase mixture; 2, performing spray drying, freeze drying or spray pyrolysis on the liquid phase mixture to form a powder precursor, and performing calcination on the precursor to prepare into the iron oxide / carbon composite material; or performing spray pyrolysis on the mixed solution directly to prepare into the iron oxide / carbon composite material. The preparation method for the iron oxide / carbon composite material, which is provided by the invention, is high in production efficiency and suitable for large-scale production; the utilization efficiency of the composite material is improved; the iron oxide / carbon composite material provided by the invention is taken as the anode material of a lithium ion battery, so that the lithium storage capacity of the anode material of the lithium ion battery is several times as much as that of commercial carbon anode material.

Description

technical field [0001] The invention belongs to the field of energy materials. In particular, it relates to a novel lithium ion battery negative electrode material and a preparation method thereof, a negative electrode using the material and a lithium ion battery thereof. technical background [0002] With the increasing demand for energy and the increasing requirements for environmental protection in modern society, the contradiction between the depletion of traditional petrochemical resources and the pollution of the environment and the development of modern society is increasing day by day. The developed green secondary power supply has been widely used in the power supply of small portable mobile appliances such as computers, mobile phones, and MP3 due to its high energy density, long cycle life, small self-discharge, no memory effect, and environmental friendliness. . At present, electric vehicles, hybrid electric vehicles, electric bicycles, storage and conversion of...

Claims

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Application Information

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IPC IPC(8): C01G49/02C01B31/02H01M4/36H01M4/48H01M4/583H01M10/0525C01B32/05
CPCY02E60/122Y02E60/10
Inventor 王白浪潘洪革高明霞
Owner 宇恒电池股份有限公司
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