Abstract
Lithium-ion (Li-ion) batteries are a key enabling technology for global clean energy goals and are increasingly used in mobility and to support the power grid. However, understanding and modeling their aging behavior remains a challenge. With improved data on lifetime, equipment manufacturers and end users can cost effectively select and control batteries. Writing in the <i>Journal of Power Sources</i>, Kim et al. shed light on this issue by investigating the degradation patterns of various common Li-ion cell chemistries under different duty cycles, such as peak shaving and frequency regulation. They present experimental results from a 15-month long campaign, finding that Li-ion phosphate cells degraded the least and that frequency regulation applications degraded batteries the least when normalized with respect to discharge energy.
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