Derating Guidelines for Lithium-Ion Batteries

Derating is widely applied to electronic components and products to ensure or extend their operational life for the targeted application. However, there are currently no derating guidelines for Li-ion batteries. This paper presents derating methodology and guidelines for Li-ion batteries using temperature, discharge C-rate, charge C-rate, charge cut-off current, charge cut-off voltage, and state of charge (SOC) stress factors to reduce the rate of capacity loss and extend battery calendar life and cycle life. Experimental battery degradation data from our testing and the literature have been reviewed to demonstrate the role of stress factors in battery degradation and derating for two widely used Li-ion batteries: graphite/LiCoO2 (LCO) and graphite/LiFePO4 (LFP). Derating factors have been computed based on the battery capacity loss to quantitatively evaluate the derating effects of the stress factors and identify the significant factors for battery derating.

[1]  Torbjörn Thiringer,et al.  Extending Battery Lifetime by Avoiding High SOC , 2018, Applied Sciences.

[2]  Lijie Yang,et al.  Degradation mechanism of LiCoO2/mesocarbon microbeads battery based on accelerated aging tests , 2014 .

[3]  Hewu Wang,et al.  Battery degradation minimization oriented energy management strategy for plug-in hybrid electric bus with multi-energy storage system , 2018, Energy.

[4]  Guangyu Liu,et al.  A Model of Concurrent Lithium Dendrite Growth, SEI Growth, SEI Penetration and Regrowth , 2017 .

[5]  Ralph E. White,et al.  Capacity fade of Sony 18650 cells cycled at elevated temperatures. Part II. Capacity fade analysis , 2002 .

[6]  K. Tsui,et al.  A study of the relationship between coulombic efficiency and capacity degradation of commercial lithium-ion batteries , 2018 .

[7]  Ralph E. White,et al.  Solvent Diffusion Model for Aging of Lithium-Ion Battery Cells , 2004 .

[8]  J. Groot,et al.  On the complex ageing characteristics of high-power LiFePO4/graphite battery cells cycled with high charge and discharge currents , 2015 .

[9]  Pengjian Zuo,et al.  The degradation of LiCoO2/graphite batteries at different rates , 2018, Electrochimica Acta.

[10]  Andreas Jossen,et al.  Charging protocols for lithium-ion batteries and their impact on cycle life—An experimental study with different 18650 high-power cells , 2016 .

[11]  Zhe Li,et al.  Modeling the capacity degradation of LiFePO 4/graphite batteries based on stress coupling analysis , 2011 .

[12]  Andreas Jossen,et al.  Analysis and modeling of calendar aging of a commercial LiFePO4/graphite cell , 2018, Journal of Energy Storage.

[13]  Hongsup Lim,et al.  Factors that affect cycle-life and possible degradation mechanisms of a Li-ion cell based on LiCoO2 , 2002 .

[14]  Euan McTurk,et al.  A Parametric Open Circuit Voltage Model for Lithium Ion Batteries , 2015 .

[15]  Gan Ning,et al.  Capacity fade study of lithium-ion batteries cycled at high discharge rates , 2003 .

[16]  D. Sauer,et al.  Calendar and cycle life study of Li(NiMnCo)O2-based 18650 lithium-ion batteries , 2014 .

[17]  P. Ajayan,et al.  High-temperature solid electrolyte interphases (SEI) in graphite electrodes , 2018 .

[18]  M. Pecht,et al.  Cycle life testing and modeling of graphite/LiCoO 2 cells under different state of charge ranges , 2016 .

[19]  Mark W. Verbrugge,et al.  Battery Cycle Life Prediction with Coupled Chemical Degradation and Fatigue Mechanics , 2012 .

[20]  Weiwen Peng,et al.  Bayesian Degradation Analysis With Inverse Gaussian Process Models Under Time-Varying Degradation Rates , 2017, IEEE Transactions on Reliability.

[21]  M. Verbrugge,et al.  Cycle-life model for graphite-LiFePO 4 cells , 2011 .