Effects of Triacetoxyvinylsilane as SEI Layer Additive on Electrochemical Performance of Lithium Metal Secondary Battery

摘要

The effects of a solid electrolyte interface (SEI) additive, triacetoxyvinylsilane (VS), cm the electrochemical performance of a lithium metal secondary battery were investigated. When 2 wt percent VS was added to the electrolyte, no lithium dendrite on the lithium metal surface after precycling was observed and thereby the lowest interfacial resistance of the unit cell (LiCoO_2/Li) could be achieved. With these reasons, the capacity of the unit cell based on the electrolyte containing 2 wt percent VS could maintain about 80 percent of the initial capacity after 200 cycles at a high charge/discharge current density (C/2, 1.25 mA cm~(-2)).