Does fast charging and discharging affect battery degradation?

Here, we unambiguously decouple the effects of fast charging and discharging on battery degradation by applying asymmetric charging–discharging protocols. Our findings reveal that fast charging stimulates the electrolyte decomposition and surface reconstruction and, surprisingly, fast discharging mitigates these detrimental effects.

How do charge and discharge rates affect EV battery performance?

The charge and discharge rates of electric vehicle (EV) battery cells affect the vehicle’s range and performance. Measured in C-rates, these crucial variables quantify how quickly batteries charge or discharge relative to their maximum capacity.

Why are fast charging and slow discharging protocols detrimental to cyclability?

Fast charging and slow discharging protocols are detrimental to cyclability because of the heterogeneous delithiation causing the current and strain localization, which provokes surface degradation and CEI layer formation from electrolyte decomposition.

How does high discharge affect battery performance?

Frequent high discharges, however, rapidly deplete the battery’s state of charge (SOC), especially during rapid acceleration or while climbing steep inclines. These discharges also adversely affect battery cell chemistry, reducing energy storage capacity and potential long-term performance issues.

Why are fast-charging/discharging batteries important?

Fast-charging/discharging batteries are a crucial power component to allow faster and farther travel, advancing the public adoption of future electric vehicles (EVs) 1, 2, 3.

How does a low charge rate affect battery life?

This decreases the battery’s state of health (SOH), reducing charge retention capacity and shortened operational lifespan. Lower rates, such as 0.5 and 0.2C, facilitate longer, safer charging cycles.