Selenium-containing composite material, manufacturing method thereof, and lithium-ion and lithium-selenium secondary batteries and lithium-ion capacitors comprising the same

Versatile electrode composite material preventing selenium dissolution through alternating graphene-molybdenum selenide layers

This technology features a composite structure that suppresses active material dissolution and enhances conductivity by alternately stacking carbon layers with metal compound layers containing molybdenum and selenium, inherently confining the metal compound layers between the carbon layers.

In conventional lithium-selenium batteries, the active material, selenium, dissolves into the electrolyte, degrading cycle life. Additionally, metal alloy-based active materials suffer from electrode damage due to volume expansion during charge and discharge cycles.

This technology involves mixing molybdenum, selenium, and carbon sources to obtain an intermediate product via primary heat treatment, followed by secondary heat treatment to produce a composite material with alternating layers of metal compounds and graphene or graphene oxide carbon layers. If necessary, a carbon shell layer can be added to maximize confinement. It can be applied to cathodes for lithium-ion and lithium-selenium batteries, as well as anodes for sodium/magnesium metal batteries and lithium-ion capacitors, offering the business advantage of targeting multiple electrochemical storage devices with a single material platform.

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Key Features:

• Carbon layers that are alternately and repeatedly stacked, including graphene or graphene oxide layers
• Metal compound layers that are alternately stacked with carbon layers, containing molybdenum and selenium with an interlayer spacing of 5–15 Å
• A step of mixing molybdenum, selenium, and main carbon sources simultaneously and performing primary heat treatment to produce an alternately stacked intermediate product
• A step of performing secondary heat treatment on the intermediate product to produce a composite material with repeatedly stacked carbon and metal compound layers

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This invention was developed with support from the Austrian Institute of Technology's project, "Novel layered dichalcogenide with high performance anode materials for lithium ion batteries."

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