Microcubic composite material with hierarchical structure, electrode sheet, sodium ion battery and preparation method thereof

Abstract

The invention relates to a microcubic composite material with a hierarchical structure, an electrode sheet, a sodium ion battery and a preparation method thereof. The preparation method firstly prepares a precursor FeFe(CN)6 by a simple heat-assisted method, and in a later selenization process, the iron atoms in the precursor are converted in-situ to FeSe2, and at the same time, packaging by a carbon skeleton converted simultaneously by an organic framework is carried out. The compound prepared by the method is prepared to an electrode as the negative electrode of a sodium ion battery, and through testing, electrochemical characteristics such as high specific capacity, long cycle life, and excellent rate performance are presented, and the preparation method has the series of advantages such as a simple process, low energy consumption, and low cost, and therefore has broad application prospects.

Description

technical field [0001] The invention relates to the field of negative electrode materials for sodium-ion batteries, in particular to micro-cubic composite materials with hierarchical structures, electrode sheets, sodium-ion batteries and a preparation method thereof. Background technique [0002] As an important part of sodium-ion batteries, the development of negative electrode materials has become an important factor affecting the application of sodium-ion batteries. At this stage, the development of negative electrode materials for sodium-ion batteries is facing great challenges. And anode materials with superior electrochemical properties have become the focus of scientific research workers. Among the many materials that have been proven to have sodium storage activity, transition metal selenides have received extensive attention due to their superior electrochemical properties, such as MnSe 2 ,FeSe 2 , FeSe, CoSe 2 ,CoSe,NiSe 2 etc. have been widely studied, but in ...

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Problems solved by technology

Among the many materials that have been proven to have sodium storage activity, transition metal selenides have received extensive attention due to their superior electrochemical properties, such as MnSe 2 ,FeSe 2 , FeSe, CoSe 2 ,CoSe,NiSe 2 etc. have been widely studied, but in the past research results, it is difficult to achieve excellent electrochemical performance through cumbersome operations such as difficult-to-control nano-design, multi-step carbon coating or expensive graphene coincidence technology. The unification of excellent sodium storage performance and simple production process

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