Journal
ACS NANO
Volume 17, Issue 19, Pages 19459-19469Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.3c08576
Keywords
lithium metal batteries; low temperature; polymer-alloy-fluorideinterphase; fast ion transport; high areal capacity
Ask authors/readers for more resources
In this study, a new concept of functional interphase design is proposed to improve the electrochemical reaction kinetics of low-temperature lithium metal anodes. The hybrid polymer-alloy-fluoride (PAF) interphase not only exhibits superior lithiophilicity, but also provides abundant pathways for fast and homogeneous Li+ transport. The designed PAF-Li anode shows stable performance with low voltage hysteresis and dendrite-free morphology in cold temperatures.
Low-temperature lithium metal batteries are of vital importance for cold-climate condition applications. Their realization, however, is plagued by the extremely sluggish Li+ transport kinetics in the vicinity of Li metal anode at low temperatures. Different from the widely adopted electrolyte engineering, a functional interphase design concept is proposed in this work to efficiently improve the low-temperature electrochemical reaction kinetics of Li metal anodes. As a proof of concept, we design a hybrid polymer-alloy-fluoride (PAF) interphase featuring numerous gradient fluorinated solid-solution alloy composite nanoparticles embedded in a polymerized dioxolane matrix. Systematic experimental and theoretical investigations demonstrate that the hybrid PAF interphase not only exhibits superior lithiophilicity but also provides abundant ionic conductive pathways for homogeneous and fast Li+ transport at the Li-electrolyte interface. With enhanced interfacial dynamics of Li-ion migration, the as-designed PAF-Li anode works stably for 720 h with low voltage hysteresis and dendrite-free electrode morphology in symmetric cell configurations at -40(degrees)C. The full cells with PAF-Li anode display a commercial-grade capacity of 4.26 mAh cm(-2) and high capacity retention of 74.7% after 150 cycles at -20(degrees)C. The rational functional interphase design for accelerating ion-transfer kinetics sheds innovative insights for developing high-areal-capacity and long-lifespan lithium metal batteries at low temperatures.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available