Lithium (Li) pulverization during cycling is one of the most critical barriers for safe operation of Li metal batteries (LMBs).  Here we report a new approach to prevent pulverization of Li during cycling using an electrolyte with a novel solvent which is the first time used in rechargeable Li batteries. A monolithic solid electrolyte interphase (SEI) generates in this electrolyte is largely different with those of mosaic- or multilayer-type SEIs reported before. This highly homogeneous SEI layer is fully amorphous and enriched with inorganic species. It not only avoids porous dendritic lithium formation, but also minimizes Li loss and volumetric expansion. Furthermore, this electrolyte greatly suppresses the phase transformation (from layer structure to rock salt) of the cathode surface and stabilizes the cathode structure. Therefore, excellent cell performances in terms of long-term cycling stability and high rate capability is realized in high voltage LMBs together with reduced safety concerns.<br/>

Preventing Li depletion and pulverization by monolithic SEI layer generated in fluorinated orthoformate based electrolytes

2019 Fall National Meeting

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.