Electroplating selenium plating solution, and lithium-selenium battery and positive electrode material thereof

Abstract

The invention provides a preparation method for a positive electrode material of a lithium-selenium battery. The preparation method comprises the following steps of A), performing mixing on seleninic acid or selenite, an electrolyte salt, a pH regulator, a pH buffering agent, a surfactant and water to obtain a mixed solution; and B), performing electroplating on the mixed solution on a base at a temperature of 15-60 DEG C to obtain the positive electrode material of the lithium-selenium battery. By adoption of the specific electroplating solution and by matching with specific electroplating parameters, a selenium plating layer with high purity and small grain sizes can be prepared; the material prepared by the method can be directly used for the lithium-selenium battery, without needing to add any conductive agent and binder; and meanwhile, the loading capacity of selenium can be well controlled by controlling electroplating time, electroplating potentials and surface current. The positive electrode material of the lithium-selenium battery prepared by the preparation method provided by the invention has excellent charging-discharging specific capacity and cycling performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a plating solution for electroplating selenium, anode materials for lithium-selenium batteries and lithium-selenium batteries. Background technique [0002] With the development of society and economy, the sharp increase of global car ownership has led to the continuous consumption of a large amount of fossil fuels. The resulting global energy crisis and the huge pressure on the environment have become increasingly prominent. The development of new clean and renewable secondary energy has become imminent. [0003] As a rechargeable secondary energy storage system, lithium-ion batteries have been rapidly developed and applied in portable digital products, wearable electronic devices, pure electric vehicles, and energy storage power stations, and people's demand for lithium-ion batteries is increasing More and more, performance requirements are getting higher and hig...

AI Technical Summary

Problems solved by technology

However, this type of method still has some active components in contact with the electrolyte. At the same time, for the selenium-carbon composite material with high selenium loading, a large amount of active component selenium will remain on the surface of the porous carbon, and part of the selenium will still be dissolved in the electrolyte. Therefore, it is impossible to fully protect the active components and make full use of the active substances

At the same time, the positive electrode material of the lithium-selenium battery prepared by the above-mentioned traditional coating method needs a conductive agent and a binder, and the preparation method is cumbersome.

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