Method for preparing germanium cathode material on nickel nanoneedle conical array

Abstract

The invention discloses a method for preparing a germanium cathode material on a nickel nanoneedle conical array. The preparation method comprises the following steps: firstly preparing the nickel nanoneedle conical array with a certain height by utilizing a water solution electrodeposition method on a nickel basal body, then preparing a germanium cathode material by utilizing an ionic liquid electrodeposition method in an anaerobic and hydrophobic environment, assembling a battery after carbon spraying treatment, and testing the electrochemical performance of the battery. The ionic liquid electrodeposition method is utilized on the nickel nanoneedle conical array for preparing the germanium cathode material with high specific capacity, long cycle life and high coulombic efficiency; during the ionic liquid electrodeposition process, the current density is low, and prepared germanium films are uniform; moreover, the prepared material comprises nano-sized particles, so that pulverization during the material cyclic process is reduced, the foundation area of the prepared cathode material and the prepared basal body (nickel nanoneedle conical array) is large, the binding force is good, and the preparation method is simple in process and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a method for preparing a germanium negative electrode material on a nickel nano needle cone array. [0002] Background technique [0003] Since Sony introduced carbon materials into the market as negative electrodes of lithium-ion batteries in the 1990s, carbon and carbon-based materials have always dominated the negative electrodes of lithium-ion batteries. However, due to the limitation of theoretical capacity (LiC6, 372 mAh / g), carbon materials can no longer meet the requirements of users. [0004] At present, C, Si, Ge and Sn, which are the fourth main group, are all excellent materials for lithium-ion battery cathodes, especially thin-film or nanostructured lithium batteries due to their high specific energy, good cycle charge and discharge performance, The stable discharge platform and other advantages have received more attention. However, the ge...

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Problems solved by technology

On the contrary, there is less research on preventing the pulverization and falling off of anode materials by changing the structure of current collectors.

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