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Predictive Models of Li-ion Battery Lifetime

NREL is a national laboratory of the Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. Predictive Models of Li-ion Battery Lifetime Kandler Smith, Eric Wood, Shriram Santhanagopalan, Gi-Heon Kim, Ying Shi, Ahmad Pesaran National Renewable Energy Laboratory Golden, Colorado IEEE Conference on Reliability Science for Advanced Materials and Devices Colorado School of Mines Golden, Colorado September 7-9, 2014 NREL/PR-5400-62813 2 Key Messages Semi-empirical Battery Lifetime Models are generally suitable for system design & control oLong-term validation still needed oStandardization would benefit industry oCharacterization requires expensive cell aging ex

Example simulation: 1 cycle/day at 25°C . 50% DOD: Graceful fade controlled by Li loss ~ t. 1/2 80% DOD: Transitions to electrode site loss, N ~ 2300 cycles . Life over-predicted by 25% without accounting for transition from Li loss (~chemical) to site loss (~mechanical) NCA Time (Days)

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