Method for preparing anode materials for lithium and selenium batteries

Abstract

The invention discloses a method for preparing nanometer anode materials for lithium and selenium batteries. The method includes steps of (1), coating a layer of carbon-containing polymers on selenide; (2), drying the selenide coated with the carbon-containing polymers, then placing the selenide in a furnace, filling the furnace with inert gas and carbonizing the selenide to generate carbon-coated selenide; (3), carrying out reaction on the carbon-coated selenide and solution with oxidizing substances (such as trivalent Fe<3+> ions), oxidizing selenium ions in the selenide to obtain elemental selenium and drying the elemental selenium to obtain the carbon-coated selenium electrode material with redundant internal spaces. The method has the advantages that sufficient spaces can be provided for selenium lithiation by selenium / cavity / carbon composite structures, polyselenide of lithium can be constrained in carbon spaces, and the electric conductivity and the electron transport performance of the materials can be improved by carbon layers; the problems of volume expansion of selenium and shuttling of poly-selenium compound in charge and discharge procedures can be effectively solved by the aid of the method, the cycle stability and the rate capability of the lithium and selenium batteries can be greatly improved, the volume energy density of the batteries can be increased, and the method has extremely high application potential.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and more specifically relates to a preparation method of a lithium-selenide battery cathode material. Background technique [0002] With the rapid development of the global economy, the increasing demand for energy, the depletion of fossil energy and the serious environmental pollution, there is an urgent need for human beings to develop new energy sources. The development of secondary batteries with high energy density, long cycle life, high safety, green environmental protection and low cost is of great significance in the field of new energy 。 Lithium-sulfur secondary batteries with elemental sulfur as the positive electrode, in which the sulfur positive electrode has a high theoretical specific capacity (1675mAh / g), have become the focus of research and development of the next generation of high energy density lithium secondary batteries. However, there are still several technic...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the object of the present invention is to provide a method for preparing the anode material of lithium-selenium battery, aiming to solve the technical problems of low cycle life, poor stability and low volume energy density of lithium-ion batteries in the prior art

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