Material for lithium secondary battery anodes, lithium secondary batteries containing the same, and manufacturing method for the lithium secondary battery anode material

High-Efficiency Silicon Oxide Anode Material with Controlled Si-O Bonding via Network Modifiers

This technology improves initial coulombic efficiency and suppresses irreversible reactions by controlling the Si-O bonding state within the silica (SiO2) matrix of silicon oxide (SiOx) using network modifiers, network formers, or non-network formers.

In conventional silicon oxide anode materials, the amorphous SiO2 matrix reacts with lithium during the initial charge to form irreversible lithium silicon oxides, resulting in a low initial coulombic efficiency of approximately 70%. Furthermore, crystallization through high-temperature heat treatment often leads to grain growth and reduced cycle life.

This technology involves mixing a silicon oxide precursor with network modifiers (such as alkali metals) and network formers or sulfur (S)-based non-network formers, followed by solid-state synthesis at 500–1,000°C, enabling the stable achievement of properties required for secondary battery anode materials.

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Key Features:

• Silicon oxide composite featuring a silica matrix integrated with network modifiers and non-network formers to regulate the bonding state of silicon particles
• Sulfur-containing non-network former introduced to regulate the Si-O bonding state of the silica matrix
• Manufacturing process for anode materials involving the solid-state synthesis of a silicon oxide precursor mixed with network modifiers and non-network formers
• Composite structure that enhances initial coulombic efficiency by suppressing the formation of irreversible lithium silicon oxides during initial charging

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