Distinct capacity fade modes of Nickel-rich/Graphite-SiOx power lithium ion battery

Abstract

The lithium ion battery (LIB) with high energy density can overcome the challenge of mileage anxiety. However, the capacity fade brings uncertainty to the battery operation condition, particularly for the high energy density batteries. Four different voltage operation ranges are set to the Nickel-rich/Graphite-SiOx LIB for cycle test. The capacity fade forms are distinct and shows higher relationship with the low cut-off voltage. This phenomenon is originated from the anode material failure and side reactions. The mechanism of capacity fade is verified by the high-resolution experimental characterization of the particle. Furthermore, the capacity fade model of the LIB is used to quantify the aging factor. The non-linear capacity fade originates from SEI thickness sharply increased according to our simulation model. In addition, based on our database, the early capacity prediction of the power batteries can be from the thickness.