An accelerated calendar and cycle life study of Li-ion cells

• Published in: Journal of power sources Vol. 101; no. 2; pp. 238 - 247
• Main Authors: Bloom, I, Cole, B.W, Sohn, J.J, Jones, S.A, Polzin, E.G, Battaglia, V.S, Henriksen, G.L, Motloch, C, Richardson, R, Unkelhaeuser, T, Ingersoll, D, Case, H.L
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.10.2001; Elsevier Sequoia
• Subjects: Accelerated life study; ADIABATIC SURFACE IONIZATION; Applied sciences; ARRHENIUS EQUATION; Arrhenius kinetics; Direct energy conversion and energy accumulation; ELECTRIC BATTERIES; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; ENERGY STORAGE; Exact sciences and technology; IMPEDANCE; INTERFACES; LAYERS; Li-ion cells; LITHIUM; Parabolic (VE) kinetics; POWER; REACTION KINETICS; SERVICE LIFE; SOLID ELECTROLYTES; TEMPERATURE DEPENDENCE; Accelerated life study; Parabolic (VE) kinetics; Arrhenius kinetics; Li-ion cells; Performance evaluation; Service life; Energetic efficiency; Solid electrolyte; Lithium; Activation parameter; Secondary cell; Kinetic parameter; Electric batteries; Discharge charge cycle
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/S0378-7753(01)00783-2

The accelerated calendar and cycle life of lithium-ion cells was studied. Useful cell life was strongly affected by temperature, time, state-of-charge (SOC) and change in state-of-charge (ΔSOC). In calendar life experiments, useful cell life was strongly affected by temperature and time. Temperature accelerated cell performance degradation. The rates of area specific impedance (ASI) increase and power fade followed simple laws based on a power of time and Arrhenius kinetics. The data have been modeled using these two concepts and the calculated data agree well with the experimental values. The calendar life ASI increase and power fade data follow (time) 1/2 kinetics. This behavior may be due to solid electrolyte interface layer growth. From the cycle life experiments, the ASI increase data follow (time) 1/2 kinetics also, but there is an apparent change in overall power fade mechanism when going from 3 to 6% ΔSOC. Here, the power of time drops to below 1/2, which indicates that the power fade mechanism is more complex than layer growth.