7 research outputs found
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Voltage-Based Strategies for Preventing Battery Degradation under Diverse Fast-Charging Conditions
Maintaining safe operating conditions is a key challenge for high-performance lithium-ion battery applications. The lithium-plating reaction remains a risk during charging, but limited studies consider the highly variable charging conditions possible in commercial cells. Here we combine pseudo-2D electrochemical modeling with data visualization methods to reveal important relationships between the measurable cell voltage and difficult-to-predict Li-plating onset criteria. An extensively validated model is used to compute Li plating for thousands of multistep charging conditions spanning diverse rates, temperatures, states-of-charge, and cell aging. We observe an empirical cell operating voltage limit below which plating does not occur across all conditions, and this limit varies with the battery state-of-charge and aging. A model sensitivity analysis also indicates that, when comparing two charging voltage profiles, the capacity difference at 4.0 V correlates well with the difference in the plating onset capacity. These results encourage simple strategies for Li-plating prevention that are complementary to existing battery controls
Voltage-Based Strategies for Preventing Battery Degradation under Diverse Fast-Charging Conditions
Maintaining
safe operating conditions is a key challenge for high-performance
lithium-ion battery applications. The lithium-plating reaction remains
a risk during charging, but limited studies consider the highly variable
charging conditions possible in commercial cells. Here we combine
pseudo-2D electrochemical modeling with data visualization methods
to reveal important relationships between the measurable cell voltage
and difficult-to-predict Li-plating onset criteria. An extensively
validated model is used to compute Li plating for thousands of multistep
charging conditions spanning diverse rates, temperatures, states-of-charge,
and cell aging. We observe an empirical cell operating voltage limit
below which plating does not occur across all conditions, and this
limit varies with the battery state-of-charge and aging. A model sensitivity
analysis also indicates that, when comparing two charging voltage
profiles, the capacity difference at 4.0 V correlates well with the
difference in the plating onset capacity. These results encourage
simple strategies for Li-plating prevention that are complementary
to existing battery controls