Preparation method of NiO/C nano composite microsphere material with jujube cake structure

Abstract

The invention discloses a preparation method and an application of a NiO / C nano composite microsphere material with a jujube cake structure. The method comprises the following steps: dissolving nickelchloride, resorcinol and formaldehyde in water to prepare sol, adding concentrated hydrochloric acid to adjust the pH value, and then heating the sol in a water bath to generate gel; and fully dryingthe gel, performing calcining and carbonizing in an argon-hydrogen mixed atmosphere, and performing calcining and oxidizing in an air atmosphere to obtain the product. The NiO / C nano composite microsphere with a jujube cake structure is formed by embedding NiO spherical particles into a C aerogel microsphere. When the material is used as a lithium ion battery negative electrode material, the jujube cake structure can effectively disperse NiO active particles, inhibit pulverization failure of the NiO active particles and enhance electrode conductivity, so that the reversible capacity, the cycling stability and the high-rate performance of the material are improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery electrode materials, in particular to a preparation method and application of a jujube cake structure NiO / C nanocomposite microsphere material. Background technique [0002] Compared with other commercialized secondary batteries, lithium-ion batteries have obvious advantages in terms of energy density, power density and cycle life, and are currently widely used in electronic products, electric vehicles, and battery energy storage power stations. After years of development, the traditional electrode materials of lithium-ion batteries have become increasingly mature. To achieve new breakthroughs in battery performance, new electrode materials must be developed. [0003] Transition metal oxides represented by iron group metal oxides are a class of potential anode materials for lithium-ion batteries. Based on the lithium storage mechanism of reversible conversion reactions, they can provide capacit...

AI Technical Summary

Problems solved by technology

However, during the lithiation process, the material will undergo a large volume expansion, resulting in particle pulverization, which not only causes the material to fall off from the electrode, causing capacity fading, but also forms a new interface, promoting the formation of a solid electrolyte interface (SEI) film and Accelerate the consumption of electrolyte and reduce the coulombic efficiency of charge and discharge

Therefore, iron group metal oxide anode materials usually exhibit poor practical electrochemical performance and must be modified

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