Preparation method and application of doping content-controllable nitrogen-doped carbon material

Abstract

The invention discloses a preparation method and application of a doping content-controllable nitrogen-doped carbon material. A nitrogen-doped carbon material with a nitrogen doping content of 0.1%-70% can be prepared by virtue of an ion implantation technique and is doped and modified so as to form the uniformly-doped carbon material with the controllable nitrogen doping content; and by utilizingthe ion implantation technique, the doped elements are pure and single, the doping concentration is not limited by equilibrium solid solubility, and the types, concentrations and depths of the dopedelements can be accurately controlled. By utilizing the ion implantation technique, the carbon material can be modified from the aspects of the doping of impurity atoms, the increase of surface defects and the like, so that the electrochemical performance of the material is improved, and meanwhile, problems in the preparation of the nitrogen-doped carbon material through a chemical method can be effectively solved; and the nitrogen-doped carbon material is applied to the fields of lithium ion battery negative electrode materials of energy materials, catalysts and the like, so that the lithiumion battery negative electrode materials and electrocatalysts which have good electrochemical performance can be prepared.

Description

technical field [0001] The invention relates to a method for preparing a nitrogen-doped carbon material, in particular to a method for preparing a nitrogen-doped carbon material with a controllable doping amount, which can be applied in the field of lithium-ion batteries and catalysts as energy materials. Background technique [0002] With the development of science and technology and the growth of people's needs, lithium-ion batteries have attracted much attention due to their advantages such as high working voltage, high energy density, long cycle life, and low self-discharge rate. They are widely used in watches, mobile phones, notebooks, etc. Computers, electric vehicles and other civilian fields, and it also plays a huge role in military defense fields such as satellites, submarines, and drones. However, the currently used lithium-ion batteries still have a lot of room for hints in terms of energy density, cycle life, and safety factor, and how to obtain lithium-ion bat...

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Problems solved by technology

However, the above methods all have uncontrollable doping and are limited by the equilibrium solid solubility, which is prone to problems such as low doping concentration (not higher than 15% in most cases) and easy introduction of other impurity atoms during the doping process.

For example, the compacted density of nitrogen-doped carbon materials after heat treatment is very low, and the volumetric capacity of the battery produced in this way is very low

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