Method for producing negative electrode active material

The production of silicon clathrate II using porous Si and a Na trapping agent in a solid phase method addresses the issue of insufficient pore volume in conventional methods, resulting in a stable negative electrode active material for lithium ion secondary batteries with improved performance.

JP7612543B2Active Publication Date: 2025-01-14TOYOTA INDUSTRIES CORP +1
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Patent Information

Application Number
JP2021151711
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-09-17
Publication Date
2025-01-14
Estimated Expiration
2041-09-17

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Abstract

To provide a negative electrode active material containing silicon clathrate II and having sufficient pore volume.SOLUTION: A method for manufacturing negative electrode active material includes an alloying step of reacting a Na source and a Si source to produce a Na-Si alloy containing Na and Si, and a silicon clathrate forming step of heating the Na-Si alloy to reduce the amount of Na in the Na-Si alloy to form silicon clathrate II, a porous Si having a BET specific surface area of 20 m2 / g or more is used as the Si source.SELECTED DRAWING: None
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Citation Information

Patent Citations

  • METHOD FOR PRODUCING Si CLATHRATE

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  • Negative electrode active material including silicon clathrate ii

    JP2021034279A

  • Manufacturing method of porous silicon grain, manufacturing method of electrode for electricity storage device, manufacturing method of whole solid lithium ion secondary battery, porous silicon grain, electrode for electricity storage device, and whole solid lithium ion secondary battery

    JP2021123517A