This technology features a separator asymmetrically coated on both sides with a carbon particle layer, such as graphene, and a metal oxide-based inorganic particle layer. This dual-function design simultaneously improves electrical conductivity on the cathode side and provides physical protection on the anode side.
Batteries using metal anodes are prone to short circuits caused by the growth of dendrites. Additionally, they suffer from rapid performance degradation due to the shuttling effect, where polysulfides generated at the sulfur-containing cathode migrate to the anode.
This technology involves coating an insulating porous substrate with a carbon particle layer (graphene particles and binder) on the cathode-facing side and an inorganic particle layer (metal oxide nanoparticles and binder) on the anode-facing side, at a weight ratio of 2:1 to 8:1. The micro/nano-composite pores in the carbon layer trap polysulfides at the cathode, while the inorganic layer prevents dendrite penetration. Applicable to metal-sulfur batteries like lithium-sulfur and sodium-sulfur, as well as long-cycle energy storage cells, this single separator effectively manages the distinct degradation factors of both the cathode and anode.
This invention was developed with support from the Ministry of Science and ICT for the development of core and commercialization technologies for interface-optimized, rod-shaped secondary battery materials.
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