05001000150020000.70.750.80.850.90.95125 degC capacity25 degC: still above 80% at 2000 cycles40 degC capacity765 cycles55 degC capacity209 cyclescycle numbercapacity retention (fraction of initial)Efficiency separates the cells long before capacity doescoulombic efficiency (axis truncated)0.9970.9980.999125 degC efficiency40 degC efficiency55 degC efficiency25 degC capacity40 degC capacity55 degC capacityend of life (80%)25 degC efficiency40 degC efficiency55 degC efficiency