Lithium-air battery is considered as a potential replacement for lithium-ion batteries because of its high theoretical energy.
However, till now, such systems have been primarily limited to pure oxygen environments and have limited cycle life due to the side reactions involving the cathode, anode, and electrolyte.
These side reactions may become more complicated in the presence of N2, CO2 and water vapor. Furthermore, due to the need of storaging O2, the volumetric energy density of the lithium-oxygen system may be too small for practical applications.
Recently, Professor Amin Salehi-Khojin and the Argonne National Laboratory Larry A. at the University of Illinois at Chicago. Led by a team of Professor Curtiss (co-communication author), in collaboration with the Illinois Institute of Technology and California State University, two strategies were employed to limit lithium in a simulated air atmosphere containing representative amounts of O2, N2, CO2 and H2O.
Side reaction in an oxygen battery. First, the team developed the Li2CO3/C coated lithium anode to allow only lithium cations to pass, thereby protecting the anode from the composition of the simulated air. Secondly, a cathode was constructed based on the previously reported molybdenum disulfide nanoflakes, and a mixture of ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIM-BF4) and dimethyl sulfoxide (DMSO) was used. Electrolyte. The components of the system operate together to prevent the formation of by-products in the presence of CO2 and H2O. Working as a lithium-air battery in a simulated air environment, the cycle life is up to 700 times. Related results were published in Nature under the title "A lithium-oxygen battery with a long cycle life in an air-like atmosphere".
According to characterization and computational studies, the protected lithium anode, electrolyte mixture and high performance air cathode work together to provide a lithium-oxygen battery with long cycle life under simulated air conditions. The new architecture of this design lithium-ion battery has a much higher energy density than current lithium-ion batteries and is a promising step in this field.
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