Nickel selenide-zinc selenide microsphere/graphene negative electrode material and preparation method and application thereof

• Main Authors: XU ZHENGZHENG, XU MINGHANG, YANG HONGXUN
• Format: Patent
• Language: Chinese; English
• Published: 11.07.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to a nickel selenide-zinc selenide microsphere/graphene negative electrode material as well as a preparation method and application thereof. The nickel selenide-zinc selenide microsphere/graphene negative electrode material is prepared from potassium tetracyanonickelate, zinc salt, selenium powder and graphene oxide. Wherein the diameter of the nickel selenide-zinc selenide microspheres is about 200-500 nm, the nickel selenide-zinc selenide microspheres are wrapped by the graphene nanosheets, and an obvious heterojunction exists between NiSe2 and ZnSe; the selenium content is 52.57%-56.57%, the nickel content is 18.98%-19.09%, the zinc content is 14.65%-18.47%, the carbon content is 0.62%-1.62%, and the oxygen content is 8.18%-9.25%. The nickel selenide-zinc selenide microsphere/graphene negative electrode material disclosed by the invention is applied to a sodium ion battery, so that the conductivity of electrons can be improved, the diffusion kinetics can be improved, and the volume ch