Multi-layered composite structure containing pre-lithiated metal oxide and manufacturing method thereof

Anode with suppressed volume expansion using a conductive carbon and pre-lithiated oxide double shell

This technology features a core-shell structure that sequentially forms a conductive carbon layer (inner shell) and a pre-lithiated metal oxide layer (outer shell) on the surface of silicon-based anode particles. This design suppresses lithium-ion trapping and volume expansion during charge and discharge cycles while promoting the formation of a stable SEI.

Silicon-based anode materials have historically faced issues with capacity degradation and reduced cycle life due to rapid volume expansion during charge and discharge, unstable Solid Electrolyte Interface (SEI) formation, and lithium-ion trapping caused by incomplete lithium extraction.

This technology can be applied to improve the stability and cycle life of secondary battery anode materials by manufacturing a multi-layered composite structure consisting of silicon particles, conductive carbon, and pre-lithiated metal oxides (such as LiAlO2). The process involves carbon coating via dopamine polymerization (Step 1), metal oxide coating (Step 2), and a pre-lithiation reaction through heat treatment after mixing with a lithium precursor (Step 3).

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Key Features:

• Preparing a first particle mixture with a polydopamine coating layer by mixing anode particles in a dopamine-containing buffer solution
• Forming a metal oxide coating layer on the polydopamine coating layer by dispersing the first particle mixture in an aqueous metal precursor solution
• A configuration that sequentially forms an inner shell of conductive carbon and an outermost shell of pre-lithiated metal oxide on the surface of silicon-based anode particles
• A composite structure that suppresses lithium-ion trapping and volume expansion during charge and discharge through a multi-layered shell structure

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