NiCo2O4, preparation method and application thereof

Abstract

The invention discloses a preparation method of NiCo2O4. The method includes: taking an ammonia water solution as the mother liquor, injecting a metal source solution and a precipitant into the motherliquor for reaction, controlling the pH value of the reaction system in the reaction process at 11.5-12.5 and the temperature at 70-90DEG C, washing and drying the obtained product to obtain a basicnickel cobalt carbonate composite precursor, wherein the metal source solution is obtained by adding a nickel salt, a cobalt salt and a surfactant into deionized water and mixing the substances evenly; and calcining the basic nickel cobalt carbonate composite precursor to obtain a powder material, i.e. NiCo2O4. The invention also discloses a structure and application of the NiCo2O4 accordingly. The NiCo2O4 prepared according to the invention has a novel structure and porous double-hemisphere structure, and when the NiCo2O4 is used as a lithium ion battery negative electrode material, a crack between the hemispheres endows the material with a large surface area, thus being beneficial to contact of the material with an electrolyte solution. In addition, the special porous double-hemisphere structure is beneficial to diffusion of lithium ions into the material, so that the rate performance and cycle performance of the material can be effectively improved.

Description

technical field [0001] The invention belongs to the field of inorganic functional materials, in particular to a nickel-cobalt composite oxide (NiCo 2 o 4 ) preparation and its application. Background technique [0002] In recent years, due to the low theoretical capacity of graphite, the traditional negative electrode material of lithium-ion batteries, new high-capacity negative electrode materials have received high attention. Metal oxides such as Co 3 o 4 , Fe 2 o 3 , ZnO, NiO, SnO 2 ,TiO 2 and AB 2 o 4 (e.g. MnCo 2 o 4 , NiCo 2 o 4 , ZnCo 2 o 4 , FeCo 2 o 4 etc.) are considered to have broad prospects in the field of electrochemical energy storage anode materials because of their high specific capacity. Among various metal oxides, NiCo 2 o 4 It has the advantages of high theoretical capacitance, low cost, good electrochemical activity, and large capacity, which has aroused extensive interest of researchers. In addition, NiCo 2 o 4 Than Co 3 o 4 Or...

AI Technical Summary

Problems solved by technology

The results show that the nanocrystallized NiCo 2 o 4 The electrochemical performance of lithium-ion batteries is significantly enhanced, but nanomaterials have their inherent disadvantages, such as high cost, easy agglomeration and other defects

[0004] To overcome the shortcomings of existing nanostructured materials, a micro / nanostructured NiCo 2 o 4 Materials, that is, the nano-scale particles in the material are combined to form an ordered micro-scale structure, which can not only inherit the advantages of nanoparticles (such as large active surface area), but also overcome the shortcomings of nano-materials that are easy to agglomerate, so that the material has better Electrochemical properties

However, the aforementioned NiCo 2 o 4 However, the structural morphology and preparation method still cannot make NiCo 2 o 4 The electrochemical performance has been fully explored, and further improvement is urgently needed.

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