Solid
electrolyte interphase (SEI) is crucial for suppressing Li
dendrite growth in high-energy lithium metal (LiM) batteries. Unfortunately,
the naturally formed SEI on the LiM anode surface in carbonate electrolytes
cannot suppress Li dendrites, resulting in a continuous consumption
of electrolytes and LiM during cycling. Artificial SEI normally lacks
self-healing and self-regulating capability, gradually losing the
effectiveness during cycling. In this work, we report the self-regulating
phenomenon of LiRAP-ASEI that can effectively suppress Li dendrites
and is investigated using in situ optical microscopy and COMSOL multiphysics
simulation. The effectiveness of self-regulated LiRAP-ASEI is further
evaluated in the most aggressive Li/sulfur cells with a lean electrolyte
(10 μL mAh–1) and LiRAP-ASEI/LiM (2.5-fold
excess of LiM). The LiRAP@Cu∥sulfur@C cells show a stable 3000
cycle life at a current density of 11.5 mA cm–2.
The self-regulated phenomenon holds great promise for the development
of high-energy-density LMBs.
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