Micron-opened cage-like defect mno@ni material and its preparation method and application

Abstract

The present invention involves a preparation method of a micron -opening cage -like Mno@Ni material. The preparation method includes the following steps: (1) Preparation of hybrid solution for 1,3,5‑ benzene tritic acid, nickel nitrate, and manganese chloride.Transfer the hybrid solution into the reaction container, 36 hours of heat reaction at 150 ° C, and then collect, washed, washed, and dry to get Ni‑mn‑mofs open micro cage front drive;Niomn‑mofs Open Micro Cage front drive burn at 700 ° C under an inert atmosphere to obtain micron open cage -shaped defect MNO@Ni material.The invention also involves the application of Mno@Ni material and its application as a lithium -ion battery negative material.The materials described by the present invention can be used as the application of lithium electronic battery negative electrode materials. The structure can effectively alleviate the volume changes of the electrode in the long -term cycle and further suppress the crushing of the electrode material to effectively improve the volume expansion effect. At the same time, it provides a comprehensive diffusion path, Expand the contact area between the electrode and the electrolyte.

Description

technical field [0001] The invention relates to metal-organic framework materials, in particular to a micron-opened cage-like defect MnO@Ni material and a preparation method and application thereof. Background technique [0002] Benefiting from their high energy density and long cycle life, lithium-ion batteries (LIBs) have become mainstream energy storage systems (ESSs) for electronic, automotive and grid energy storage, in which electrode material technology is the core technology. Due to the limited electrochemical performance of commercial lithium-ion anode materials such as lithium-ion-intercalated lithium titanate (175mAh / g) and graphite (372mAh / g), many researchers have focused on high Research and development of performance lithium-ion battery anode materials. As promising anode materials, transition metal oxides (TMOs) with a conversion reaction mechanism have good environmental friendliness, abundant natural sources, and high theoretical capacities. [0003] MnO ...

AI Technical Summary

Problems solved by technology

Although many works have used nanotechnology to shorten the diffusion pathway of lithium ions and expand the exposed surface of the material to facilitate electrolyte penetration, this single nanostructure tends to agglomerate during cycling due to its high surface energy. , and the inherently lower tap density results in lower volumetric capacity

On the contrary, although the microstructure still has the advantage of high density, it leads to poor rate performance due to its own poor conductivity.

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