Photochemically driven solid electrolyte interphase for extremely fast-charging lithium-ion batteries

Minsung Baek, Jinyoung Kim, Jaegyu Jin and Jang Wook Choi ()
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Minsung Baek: Seoul National University
Jaegyu Jin: Institute of Battery Technology, SK on
Jang Wook Choi: Seoul National University

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Extremely fast charging (i.e. 80% of storage capacity within 15 min) is a pressing requirement for current lithium-ion battery technology and also affects the planning of charging infrastructure. Accelerating lithium ion transport through the solid-electrolyte interphase (SEI) is a major obstacle in boosting charging rate; in turn, limited kinetics at the SEI layer negatively affect the cycle life and battery safety as a result of lithium metal plating on the electrode surface. Here, we report a γ-ray-driven SEI layer that allows a battery cell to be charged to 80% capacity in 10.8 min as determined for a graphite full-cell with a capacity of 2.6 mAh cm−2. This exceptional charging performance is attributed to the lithium fluoride-rich SEI induced by salt-dominant decomposition via γ-ray irradiation. This study highlights the potential of non-electrochemical approaches to adjust the SEI composition toward fast charging and long-term stability, two parameters that are difficult to improve simultaneously in typical electrochemical processes owing to the trade-off relation.

Date: 2021
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DOI: 10.1038/s41467-021-27095-w

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