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
CN106450189AActive Publication Date: 2017-02-22SOUTH CHINA NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA NORMAL UNIVERSITY
Publication Date
2017-02-22

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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.
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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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