Solid-state electrolyte for secondary batteries, method for manufacturing the same, and lithium secondary battery comprising the same

Solid-state electrolyte with suppressed dendrite growth using amorphous succinonitrile and UV cross-linking

This technology is a polymer-inorganic composite solid-state electrolyte that suppresses lithium dendrite growth and improves ionic conductivity by converting crystalline succinonitrile into an amorphous phase through the interaction between lithium salt and succinonitrile (SN), followed by UV curing of vinyl monomers (e.g., VEC) and cross-linking agents.

Existing liquid electrolytes used in lithium-metal batteries face issues such as fire hazards and unstable SEI layer formation, while polymer electrolytes for all-solid-state batteries suffer from performance limitations due to low ionic conductivity at low temperatures and crystallization.

This technology is suitable for simultaneously improving the reliability and efficiency of secondary battery electrolytes by heat-treating succinonitrile (SN) and lithium salt to form a primary amorphous mixture, then adding vinyl monomers, acrylic cross-linking agents, and initiators, followed by UV curing to produce a solid-state electrolyte that maintains an amorphous phase.

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Key Features:

• Solid-state electrolyte for secondary batteries containing a solid phase represented by a specific chemical formula
• Configuration that converts crystalline succinonitrile into an amorphous phase through the interaction between lithium salt and succinonitrile
• Solid-state electrolyte that forms a cross-linked structure through UV curing of vinyl monomers and cross-linking agents
• Solid-state electrolyte that suppresses lithium dendrite growth using amorphous succinonitrile and a UV cross-linked structure

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