Journal
NANO LETTERS
Volume 20, Issue 5, Pages 4029-4037Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c01400
Keywords
self-regulated phenomenon; inorganic artificial SEI; cryogenic electron microscopy; lithium metal batteries
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Funding
- Key-Area Research and Development Program of Guangdong Province [2020B090919001, 2019B090908001]
- National Key R&D Program of China [2018YFB0104300]
- Key Program of National Natural Science of China [51732005]
- Shenzhen Key Laboratory of Solid State Batteries [ZDSYS201802081843465]
- Shenzhen Hong Kong Innovation Circle Joint RD Project [SGLH20161212101631809]
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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 mu L mAh(-1)) and LiRAP-ASEI/LiM (2.5-fold excess of LiM). The LiRAP@Cu parallel to 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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