| Autor: |
Lapp AS; Materials Physics Department, Sandia National Laboratories, 7011 East Avenue, Livermore, California 94550, United States., Merrill LC; Nanoscale Sciences Department, Sandia National Laboratories, 1515 Eubank Blvd. SE, Albuquerque, New Mexico 87123, United States., Wygant BR; Photovoltaics and Materials Technology Department, Sandia National Laboratories, 1515 Eubank Blvd. SE, Albuquerque, New Mexico 87123, United States., Ashby DS; Materials Physics Department, Sandia National Laboratories, 7011 East Avenue, Livermore, California 94550, United States., Bhandarkar AS; Materials Physics Department, Sandia National Laboratories, 7011 East Avenue, Livermore, California 94550, United States., Zhang AC; Materials Physics Department, Sandia National Laboratories, 7011 East Avenue, Livermore, California 94550, United States., Fuller EJ; Materials Physics Department, Sandia National Laboratories, 7011 East Avenue, Livermore, California 94550, United States., Harrison KL; Nanoscale Sciences Department, Sandia National Laboratories, 1515 Eubank Blvd. SE, Albuquerque, New Mexico 87123, United States., Lambert TN; Photovoltaics and Materials Technology Department, Sandia National Laboratories, 1515 Eubank Blvd. SE, Albuquerque, New Mexico 87123, United States., Talin AA; Materials Physics Department, Sandia National Laboratories, 7011 East Avenue, Livermore, California 94550, United States. |
| Abstrakt: |
Li-metal batteries (LMBs) employing conversion cathode materials (e.g., FeF 3 ) are a promising way to prepare inexpensive, environmentally friendly batteries with high energy density. Pseudo-solid-state ionogel separators harness the energy density and safety advantages of solid-state LMBs, while alleviating key drawbacks (e.g., poor ionic conductivity and high interfacial resistance). In this work, a pseudo-solid-state conversion battery (Li-FeF 3 ) is presented that achieves stable, high rate (1.0 mA cm -2 ) cycling at room temperature. The batteries described herein contain gel-infiltrated FeF 3 cathodes prepared by exchanging the ionic liquid in a polymer ionogel with a localized high-concentration electrolyte (LHCE). The LHCE gel merges the benefits of a flexible separator (e.g., adaptation to conversion-related volume changes) with the excellent chemical stability and high ionic conductivity (∼2 mS cm -1 at 25 °C) of an LHCE. The latter property is in contrast to previous solid-state iron fluoride batteries, where poor ionic conductivities necessitated elevated temperatures to realize practical power levels. The stable, room-temperature Li-FeF 3 cycling performance obtained with the LHCE gel at high current densities paves the way for exploring a range of architectures including flexible, three-dimensional, and custom shape batteries. |
