Large-interlayer-spacing monodisperse nano hard carbon material as well as synthesis method and application thereof

Abstract

The invention discloses a large-interlayer-spacing monodisperse nano hard carbon material as well as a synthesis method and application thereof, wherein the synthesis method comprises the following steps: (1) dissolving xylose in deionized water, stirring to be uniform, preparing a solution with the concentration of 0.3-1.5 M, heating the solution to 160-200 DEG C, and carrying out a dehydration condensation reaction; (2) carrying out centrifugal cleaning and vacuum drying on the material obtained in the step (1); and (3) carrying out high-temperature carbonization on the material obtained in the step (2) in a high-temperature furnace under a protective atmosphere, wherein the temperature is 900-1500 DEG C, the carbonization time is 2-5 hours, and the heating rate is 2-8 DEG C / min; and thus obtaining the large-interlayer-spacing monodisperse nano hard carbon material. The hard carbon material shows excellent electrochemical performance when being used for a sodium-ion battery, has a good commercialization prospect and is suitable for being applied to a large-scale energy storage system.

Description

technical field [0001] The present invention generally relates to nano-hard carbon materials, in particular to a monodisperse nano-hard carbon material with a large layer spacing, a synthesis method and applications thereof. Background technique [0002] Under the carbon-neutral strategy of carbon peaking, how to build a new energy system that realizes the effective use of clean energy such as solar energy, wind energy, and water energy has attracted widespread attention. Large-scale energy storage technology is one of the core technologies required to realize the application and popularization of smart grid systems. At present, electrochemical energy storage technology based on lithium-ion batteries has attracted the most attention. In recent years, the demand for lithium-ion batteries in the field of power batteries and 3C applications has gradually increased rapidly, but the reserves of lithium resources in the earth's crust are not abundant, and more than 80% of China's ...

AI Technical Summary

Problems solved by technology

A series of biomass hard carbons prepared from biological wastes such as orange peels, banana peels, and seaweeds have been widely reported, but the carbon yields of hard carbon materials based on such biological wastes are very low (usually less than 10 %), and the prepared hard carbon state is very dependent on the state of the raw material, the consistency is difficult to guarantee, and the coulombic efficiency in the first week is often low (usually less than 60%), the rate performance and cycle life are usually poor, and it is difficult to meet the requirements of sodium ions Requirements for battery commercialization

At present, there are no or few commercialized high-end hard carbon material suppliers in China. Some foreign companies in Japan have relatively high-end hard carbon materials, but they are expensive and belong to special new energy strategic needs. Materials are not allowed to be exported, so there is an urgent need to explore other Some of the hard carbon materials with simple synthesis methods, controllable consistency, low cost and excellent sodium storage performance can meet the needs of the domestic development of sodium-ion batteries

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