4.5 Article

Photovoltaic Wafering Silicon Kerf Loss as Raw Material: Example of Negative Electrode for Lithium-Ion Battery

Journal

CHEMELECTROCHEM
Volume 10, Issue 19, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.202300331

Keywords

amorphous materials; diamond wire sawing kerf; lithium-ion battery anode; secondary raw material; silicon

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Silicon powder kerf loss from diamond wire sawing can be used as a raw material for lithium-ion battery negative electrodes. The kerf particles contain approximately 50% amorphous silicon. Thorough investigation of the amorphicity and other relevant features was conducted. In-situ X-ray powder diffraction experiments demonstrated the significance of the powders for battery applications.
Silicon powder kerf loss from diamond wire sawing in the photovoltaic wafering industry is a highly appealing source material for use in lithium-ion battery negative electrodes. Here, it is demonstrated for the first time that the kerf particles from three independent sources contain similar to 50% amorphous silicon. The crystalline phase is in the shape of nano-scale crystalline inclusions in an amorphous matrix. From literature on wafering technology looking at wafer quality, the origin and mechanisms responsible for the amorphous content in the kerf loss powder are explained. In order to better understand for which applications the material could be a valuable raw material, the amorphicity and other relevant features are thoroughly investigated by a large amount of experimental methods. Furthermore, the kerf powder was crystallized and compared to the partly amorphous sample by operando X-ray powder diffraction experiments during battery cycling, demonstrating that the powders are relevant for further investigation and development for battery applications.

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