Dioxolone derivatives for high-energy-density Li-ion batteries

Abstract

Electrolyte additives have been explored to attain significant breakthroughs in the long-term cycle performance of lithium-ion batteries (LIBs) without sacrificing energy density. This has been achieved through the development of stable electrode interfacial structures and the elimination of reactive substances by using electrolyte additives. Classical solid electrolyte interphase additives such as vinylene carbonate and fluoroethylene carbonate have limited potential for simultaneously achieving a long lifespan and fast chargeability in high-energy-density LIBs. Here, we present a next-generation synthetic additive approach that allows to form a highly stable electrode-electrolyte interface architecture from fluorinated and silylated electrolyte additives. The developed solid electrolyte interphase-forming additives endure the lithiation-induced volume expansion of Si-embedded anodes and provide ion channels for facile Li-ion transport while protecting the Ni-rich LiNi0.8Co0.1Mn0.1O2 cathodes. The structural regulation of solid electrolyte interphase and the improved stability of cathode electrolyte interface with the use of fluorinated and silylated electrolyte additives enable fast charging of NCM811/Si-C full cells, which is vital for use in electric vehicles.