Anode

Researchers from UC San Diego demonstrated a shift towards Si anodes in solid state batteries (SSB) due to (1) cheaper Si (2) Si with solid electrolytes (SE) bing less reactive compared to lithium metal anodes, while maintaining similar capacities (3) 10x greater capacity compared to graphite anodes. During lithiation, 99.9 wt% micro-Si is passivated by the sulfide solid electrolyte (SE) to form a solid electrolyte interface (SEI). The Li-ions at the SE/Si interface alloy with Si to form a dense Li-Si, which is highly reversible. Performance achievements

High micro-Si loading of >5 mA cm-2, removal of C binders.

High cycle life: 500 cycles with 80% capacity retention over -20 to 80 oC temperature range.

Research Source: Tan D., Chen Y., Yang H. et al.

Si anode, solid-state electrolyte, and wide range operating temperature are all very challenging and highly desirable properties, and this work has achieved all of them.

Extracted from the PDF; charts and images may read imperfectly.