Carbon coated layer thickness adjustable nanometer ferroferric oxide composite material, preparation method and application thereof

Abstract

The invention relates to the field of electrochemical materials, in particular to a carbon coated layer thickness adjustable nanometer ferroferric oxide composite material, a preparation method and application thereof. The preparation method comprises the following steps: firstly, taking sugar, a catalyst and a ferric salt solution as raw materials, reacting for 0.1 to 24 h under the conditions that the pH is 5 to 10 and the temperature is 5 to 90 DEG C, preparing an iron-sugar complex, and thus preparing the carbon coated layer thickness adjustable nanometer ferroferric oxide composite material from the iron-sugar complex through in situ calcinations or a hydrothermal method. The nanometer ferroferric oxide composite material with a carbon coated layer is prepared through different in situ calcinations conditions or the hydrothermal method by using the iron-sugar complex as a precursor, and due to the fact that a multi-stage carbon structure array can play the role of a fixed frame for ferroferric oxide, the volume effect in the charge and discharge cycle process is reduced, and when the composite material serves as the negative electrode of a battery, the performance of the battery can be improved obviously. The thickness of the carbon coated layer inside the carbon coated ferroferric oxide composite material can be changed by changing the additive amounts of sugar and the catalyst.

Description

technical field

[0001] The invention relates to the field of electrochemical materials, in particular to a nano ferric oxide composite material with adjustable thickness of coated carbon layer and its preparation method and application. Background technique

[0002] With the rapid development of science and technology, various electronic products and equipment such as electric vehicles, portable computers, and smart phones have been closely connected with people's daily life, and improving the battery performance of these products has become one of the key topics of research all over the world. In the current energy storage system, lithium-ion batteries have attracted much attention due to their safety, small size, long life, large capacity, environmental protection, and wide operating temperature range. Lithium-ion batteries often use petroleum coke and graphite as negative electrode materials, which are safe, non-toxic, abundant in resources and low in cost. However, the ...

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