Journal
NANO ENERGY
Volume 108, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2023.108221
Keywords
Lithium dendrites; Zwitter-ion; LiF-rich SEI; Electrostatic interaction; Catalytic effect
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A new type of zwitter-ion modified metal-organic framework (NH3+center dot SO3-@ZIFs) is prepared as a modifier for PEO-LiTFSI, which can effectively inhibit the growth of lithium dendrites and form a LiF-rich solid electrolyte interface with high ion migration number, demonstrating the great potential of this kind of SPEs for high-performance lithium metal batteries.
The interphase formed between solid polymer electrolyte (SPE) and highly reductive lithium metal largely de-termines the overall performance of the battery. Although various types of nanoparticles have been continuously employed as fillers to achieve a stable interphase for long cycling performance, the irregular growth of lithium dendrites cannot be completely suppressed due to uneven lithium deposition. Herein, a new type of zwitter-ion modified metal-organic framework (NH3+center dot SO3-@ZIFs) is prepared as a modifier for PEO-LiTFSI. Due to the unique ionic structure of NH3+center dot SO3--@ZIFs, the formed electrostatic interaction could inhibit the movement of TFSI-, enhance the ion migration number. More importantly, TOF-SIMS effectively confirms the formation of Li+ -conductive LiF-rich SEI due to the catalytic effect of NH3+center dot SO3-@ZIFs, which could homogenize the lithium flux, inhibit the growth of Li dendrite. Results show that the PEO-NH3+center dot SO3- @ZIFs exhibits high ion migration number (tLi+ = 0.78). The Li/Li symmetric cells equipped NH3+center dot SO3-@ZIFs SPE can be stably operated for more than 4600 h at 60 C-? while the full cell with LiFePO4 cathode also enables long-term stability over 1200 cycles with capacity stabilizing at around 103 mAh g(-1), demonstrating the great potential of this kind of SPEs for preparing high-performance LMBs.
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