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Nitrogen-doped and carbon-coated iron trioxide anode material for lithium ion battery and preparation method of nitrogen-doped and carbon-coated iron trioxide anode material

A technology for ferric oxide and lithium ion batteries, which is applied in the field of electrochemical power sources, can solve the problems of ferric oxide easy to powder and agglomerate, decrease battery cycle performance, unfavorable electron transport, etc., and achieves good application prospects and easy preparation process. Amplified, high cycle capacity effects

Active Publication Date: 2017-06-09
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while Fe2O3 has outstanding advantages as a negative electrode material for lithium batteries, it also has some disadvantages: 1) The conductivity of bulk Fe2O3 is poor, which is not conducive to the transmission of electrons; Easy to pulverize and agglomerate, resulting in a sharp drop in battery cycle performance

Method used

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  • Nitrogen-doped and carbon-coated iron trioxide anode material for lithium ion battery and preparation method of nitrogen-doped and carbon-coated iron trioxide anode material
  • Nitrogen-doped and carbon-coated iron trioxide anode material for lithium ion battery and preparation method of nitrogen-doped and carbon-coated iron trioxide anode material
  • Nitrogen-doped and carbon-coated iron trioxide anode material for lithium ion battery and preparation method of nitrogen-doped and carbon-coated iron trioxide anode material

Examples

Experimental program
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Effect test

Embodiment 1

[0040] In this example, the nitrogen-doped carbon-coated ferric oxide lithium ion battery negative electrode material was prepared according to the following steps:

[0041] A. Add ferric chloride hexahydrate and sodium dihydrogen phosphate dihydrate into 300mL water to obtain a reaction solution; the concentration of ferric chloride in the reaction solution is 0.02mol / L, and the concentration of sodium dihydrogen phosphate is 0.45mmol / L L;

[0042] Add the reaction solution into the reaction kettle, conduct a hydrothermal reaction at 105°C for 48 hours, cool down to room temperature naturally, centrifuge and wash to obtain the nano-spindle-shaped ferric oxide.

[0043] B. Disperse 50mg of nano-spindle-shaped ferric oxide in 200mL of a mixture of isopropanol and water at a volume ratio of 4:1, stir ultrasonically for 30min, and then add 2mL of ammonia and 0.2mL of orthosilicate Ethyl ester, continue to stir for 4h, centrifuge and wash to obtain the spindle precursor Fe 2 o ...

Embodiment 2

[0053] In this example, the nitrogen-doped carbon-coated ferric oxide lithium ion battery negative electrode material was prepared according to the following steps:

[0054] A. Add ferric chloride hexahydrate and sodium dihydrogen phosphate dihydrate into 300mL water to obtain a reaction solution; the concentration of ferric chloride in the reaction solution is 0.02mol / L, and the concentration of sodium dihydrogen phosphate is 0.45mmol / L L;

[0055] Add the reaction solution into the reaction kettle, conduct a hydrothermal reaction at 105°C for 48 hours, cool down to room temperature naturally, centrifuge and wash to obtain the nano-spindle-shaped ferric oxide.

[0056] B. Disperse 50mg of nano-spindle-shaped ferric oxide in 200mL of a mixture of isopropanol and water at a volume ratio of 4:1, stir ultrasonically for 30min, and then add 2mL of ammonia and 0.3mL of orthosilicate Ethyl ester, continue to stir for 4h, centrifuge and wash to obtain the spindle precursor Fe 2 o ...

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Abstract

The invention discloses a nitrogen-doped and carbon-coated iron trioxide anode material for a lithium ion battery and a preparation method of the nitrogen-doped and carbon-coated iron trioxide anode material. The preparation method comprises the following steps: coating the outer surface of nano-fusiform iron trioxide with a silicon dioxide layer to serve as a precursor; then coating the outer surface of the silicon dioxide layer with one layer of conducting polypyrrole; finally, annealing to carbonize the polypyrrole, and etching to remove a silicon dioxide interlayer, thus obtaining the nitrogen-doped and carbon-coated iron trioxide anode material with an interlayer void structure. The nitrogen-doped and carbon-coated iron trioxide anode material for the lithium ion battery, provided by the invention, can keep high cycling capacity, excellent cycling stability and high multiplying power (high current density charging and discharging) within a wider temperature range including room temperature, as well as good application prospect.

Description

technical field [0001] The invention relates to a negative electrode material of a rechargeable and dischargeable lithium ion battery and a preparation method thereof, belonging to the field of electrochemical power sources. Background technique [0002] Facing the current increasingly pressing energy and environmental issues, the development of efficient and stable lithium secondary batteries has become a top priority. Lithium-ion batteries have the characteristics of high energy density, long cycle life, and environmental friendliness, and are widely used in portable electronic products and power or energy storage batteries and other fields. At present, graphite anode materials for commercial lithium-ion batteries have low specific capacity, poor rate performance, and great safety hazards. Therefore, the development of new anode materials has become a hot spot in this research field. In recent years, with the deepening of research on lithium-ion batteries, it has been fou...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/525H01M10/0525
CPCH01M4/366H01M4/525H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 从怀萍张宝林辛森
Owner HEFEI UNIV OF TECH
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