Controlling Li Dendritic Growth in Graphite Anodes by Potassium Electrolyte Additives for Li-Ion Batteries.

ABSTRACT: Fast charging promotes Li dendrite formation and its growth on graphite anodes, which affects cell performance in Li-ion batteries (LIBs). This work reports the formation of a robust SEI layer by introducing a KPF₆ inorganic additive into the electrolyte. An optimal concentration of 0.001 M KPF₆ effectively inhibits the growth of Li dendrites at 2C charging rates, compared with a commercial electrolyte. Electrolytes containing a KPF₆ additive are shown here to deliver dual effects to mitigate the growth of dendrites. A thin LiF-rich SEI layer is formed on graphite, which blocks the electron leakage pathways. Additionally, K⁺ resides at defect sites (such as particle boundaries) due to its faster diffusion rate and blocks the incoming Li⁺

SUBMITTER: Moharana S 

PROVIDER: S-EPMC9501903 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature