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Article Dans Une Revue Battery Energy Année : 2022

Transforming silicon slag into high‐capacity anode material for lithium‐ion batteries

Résumé

Abstract The conception of cheaper and greener electrode materials is critical for lithium (Li)‐ion battery manufacturers. In this study, a by‐product of the carbothermic reduction of SiO 2 to Si, containing 65 wt% Si, 31 wt% SiC, and 4 wt% C, is evaluated as raw material for the production of high‐capacity anodes for Li‐ion batteries. After 20 h of high‐energy ball milling, C is fully converted to SiC and a micrometric powder ( D 50 ∼1 μm) is obtained in which submicrometric SiC inclusions are embedded in a nanocrystalline/amorphous Si matrix. This material is able to maintain a capacity >1000 mAh g −1 (>3 mAh cm −2 ) over 100 cycles. No crystalline Li 15 Si 4 phase is formed upon cycling as shown from the differential dQ / dV curves. The good mechanical resiliency of the electrode is evidenced by monitoring its morphological changes from sequential focused ion beam scanning electron microscopy analyses. However, a progressive and irreversible increase in the electrode mass and thickness is observed over cycling (reaching 125% and 60% after 200 cycles, respectively), which is mainly attributed to the accumulation of solid electrolyte interphase products in the electrode.

Domaines

Matériaux

Dates et versions

hal-04191412 , version 1 (30-08-2023)

Identifiants

Citer

Victor Vanpeene, Alexandre Heitz, Natalie Herkendaal, Patrick Soucy, Thierry Douillard, et al.. Transforming silicon slag into high‐capacity anode material for lithium‐ion batteries. Battery Energy, 2022, 1 (4), ⟨10.1002/bte2.20220016⟩. ⟨hal-04191412⟩
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