Keywords: silicon, Li-ion cells
Summary:Silicon as a negative electrode material is the main candidate for replacing part of the graphite used in Li-ion batteries in order to increase energy density. After years of optimization, the electrolyte reactivity of Si remains the primary challenge to its adoption. In this talk, the surprising effect of CO2 on improving the performance of Si will be demonstrated through cycling, volume measurements, calorimetry, and electron microscopy. Consequences on cell design will be discussed.