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Nitrogen-doped carbon-coated iron oxide negative electrode material for lithium-ion battery and preparation

A technology for lithium ion batteries and negative electrode materials, applied in the field of nitrogen-doped carbon-coated iron oxide negative electrode materials for lithium ion batteries and its preparation field, can solve the problems of poor electrical conductivity of iron oxide negative electrode materials, unsatisfactory cycle efficiency, and poor SEI film Stability and other issues, to achieve the effect of low cost of raw materials, excellent electrochemical performance, and easy availability of raw materials

Active Publication Date: 2017-02-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Like other metal oxides, iron oxide anode materials have poor conductivity, and there are huge volume changes (about 200%) and powdering of active material particles during charge and discharge, resulting in a sharp drop in electrode capacity and poor cycle stability.
At the same time, due to the huge volume expansion during charging and discharging, the active material is easy to fall off, the formed SEI film is unstable, there are many side reactions, and the cycle efficiency is not ideal.

Method used

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  • Nitrogen-doped carbon-coated iron oxide negative electrode material for lithium-ion battery and preparation
  • Nitrogen-doped carbon-coated iron oxide negative electrode material for lithium-ion battery and preparation
  • Nitrogen-doped carbon-coated iron oxide negative electrode material for lithium-ion battery and preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0054] (1) Add a mixed solution of 60mL deionized water and 60mL absolute ethanol to the beaker, and add 4.05g FeCl to the mixed solution at one time under magnetic stirring 2 4H 2 O, stir for 10min; after the ferrous salt is completely dissolved, slowly add 0.75g Na 2 C 2 o 4 , control the addition for 3 minutes, and continue to stir for 30 minutes to obtain a yellow suspension; transfer the suspension to a 150mL polytetrafluoroethylene-lined reactor, and raise the temperature from room temperature to 180°C at a heating rate of 5°C min -1 , keep warm for 12h; after cooling to room temperature, the reaction product is suction filtered, washed and dried, and the yellow precipitate is collected as the ferrous oxalate precursor; in the air atmosphere, the collected ferrous oxalate solid is heated from room temperature to 600°C , the heating rate was controlled at 5 °C min -1 , keep warm for 5h; after it is naturally cooled to room temperature, a dark red iron oxide material i...

Embodiment 2

[0067] (1) Add a mixed solution of 60mL deionized water and 60mL absolute ethanol to the beaker, and add 4.05g FeCl to the mixed solution at one time under magnetic stirring 2 4H 2 O, stir for 10min; after the ferrous salt is completely dissolved, slowly add 0.75g Na 2 C 2 o 4 , control the addition for 3 minutes, and continue to stir for 30 minutes to obtain a yellow suspension; transfer the suspension to a 150mL polytetrafluoroethylene-lined reactor, and raise the temperature from room temperature to 180°C at a heating rate of 5°C·min -1 , keep warm for 12h; after cooling to room temperature, the reaction product is suction filtered, washed and dried, and the yellow precipitate is collected as the ferrous oxalate precursor; in the air atmosphere, the collected ferrous oxalate solid is heated from room temperature to 600°C , the heating rate was controlled at 5 °C min -1 , keep warm for 5h; after it is naturally cooled to room temperature, a dark red iron oxide material i...

Embodiment 3

[0071] (1) Add a mixed solution of 60mL deionized water and 60mL absolute ethanol to the beaker, and add 4.05g FeCl to the mixed solution at one time under magnetic stirring 2 4H 2 O, stir for 10min; after the ferrous salt is completely dissolved, slowly add 1.2g Na 2 C 2 o 4 , control the addition for 5 minutes, and continue to stir for 30 minutes to obtain a yellow suspension; transfer the suspension to a 150mL polytetrafluoroethylene-lined reactor, and raise the temperature from room temperature to 180°C at a heating rate of 2°C·min -1 , keep warm for 12h; after cooling to room temperature, the reaction product is suction filtered, washed and dried, and the yellow precipitate is collected as the ferrous oxalate precursor; in the air atmosphere, the collected ferrous oxalate solid is heated from room temperature to 600°C , the heating rate was controlled at 2°C min -1 , keep warm for 5h; after it is naturally cooled to room temperature, a dark red iron oxide material is ...

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Abstract

The invention belongs to the technical field of a negative electrode material for a lithium-ion battery, and discloses a nitrogen-doped carbon-coated iron oxide negative electrode material for the lithium-ion battery and a preparation method of the nitrogen-doped carbon-coated iron oxide negative electrode material. The method comprises the following steps of adding ferrite to a mixed solution of water and ethanol, stirring, dissolving, adding oxalate and stirring to obtain a turbid liquid; heating the turbid liquid to 120-220 DEG C for reaction for 8-15 hours to obtain a ferrous oxalate precursor; heating the ferrous oxalate precursor to 500-600 DEG C and burning the ferrous oxalate precursor for 4-8 hours to obtain an iron oxide; dissolving an emulsifier into water, adding n-butyl methacrylate, acrylonitrile and styrene, heating the solution to 55-65 DEG C, adding an initiator, stirring for 4-10 hours to obtain an emulsion and carrying out demulsification to obtain a polymer; and dispersing the polymer into an organic solvent, adding the iron oxide, stirring for 12-36 hours, separating to obtain a solid, heating the solid to 500-600 DEG C and burning the solid for 2-4 hours to obtain the nitrogen-doped carbon-coated iron oxide negative electrode material with excellent cycle performance and rate capability.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, in particular to a nitrogen-doped carbon-coated iron oxide negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Since its development in the 1970s, lithium-ion batteries have attracted much attention due to their advantages such as high voltage, high capacity, long cycle life, no memory effect, and environmental friendliness, and have shown huge advantages in actual production, and are widely used Used in portable mobile equipment, large energy storage devices and power devices, etc. [0003] Electrode materials, as an important part of lithium-ion batteries, realize the intercalation and extraction of lithium ions during charge and discharge. It is precisely because of the research on carbon anode materials that the safety problems brought about by traditional metal lithium electrodes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/48H01M10/0525
CPCH01M4/366H01M4/48H01M4/583H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 廖友好黄伟源李伟善蔡霞罗雪仪梁潇
Owner SOUTH CHINA NORMAL UNIVERSITY
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