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Lithium metal batteries are next-generation energy storage devices that rely on stable electrodeposition of metal lithium during charging
In view of this, Professor Zhenan Bao from Stanford University and Professor Ralph Gilles from the University of Munich have specifically studied the influence of polymer mechanical properties on the deposition of lithium metal
Characterization of polymers with different H bond strengths
The author designed a polymer network with perfluoropolyether (PFPE) as the main chain and adjusted the strength of the hydrogen bond unit to change the mechanical properties
The frequency-dependent oscillatory shear measurement was further carried out to analyze the mechanical properties and fluidity of the polymer
Figure 1 Characterization of polymers with different H bond strengths
Interaction between polymer and salt and electrolyte
To understand how the polymer interacts with lithium ions, lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt is mixed into the polymer here
Figure 2 Interaction between polymer and salt and electrolyte
Li||Cu battery performance and lithium deposition morphology analysis
Here, an electrolyte of 1 M LiPF6-EC/DEC +10% FEC is used to evaluate the impact of the polymer coating on the CE of the Li|Cu battery
The morphology of lithium deposits on copper electrodes with and without polymer coatings was further examined
Figure 3 Li||Cu battery performance and lithium deposition morphology analysis
Li||Cu battery performance and SEI analysis
Overall, the Li||Cu battery with M1I3 polymer coating has the highest average CE (95.
In addition, XPS spectroscopy showed that after 50 cycles, compared with the uncoated control (82%), the SEI layer with M1I3 coating showed fewer signals from CC and CH bonds (caused by the solvolysis of the EC electrolyte).
Li||Cu battery performance and SEI analysis
Summary: This work designed a series of polymers, including PFPE soft blocks and urethane-based hard blocks
