Enhanced charging capability of lithium metal batteries based on lithium bis(trifluoromethanesulfonyl)imide-lithium bis(oxalato) borate dual-salt electrolytes

Rechargeable lithium (Li) metal batteries with conventional LiPF6-carbonate electrolytes have been reported to fail quickly at charging current densities of about 1.0 mA cm(-2) and above. In this work, we demonstrate the rapid charging capability of Li parallel to LiNi0.8Co0.15Al0.05O2 (NCA) cells can be enabled by a dual salt electrolyte of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium bis(oxalato)borate (LiBOB) in a carbonate solvent mixture. The cells using the LiTFSI-LiBOB dual-salt electrolyte significantly outperform those using the LiPF6 electrolyte at high charging current densities. At the charging current density of 1.50 mA cm(-2), the Li parallel to INCA cells with the dual-salt electrolyte can still deliver a discharge capacity of 131 mAh g(-1) and a capacity retention of 80% after 100 cycles. The Li parallel to INCA cells with the LiPF6 electrolyte start to show fast capacity fading after the 30th cycle and only exhibit a low capacity of 25 mAh g(-1) and a low retention of 15% after 100 cycles. The reasons for the good chargeability and cycling stability of the cells using the LiTFSI-LiBOB dual-salt electrolyte can be attributed to the good film-formation ability of the electrolyte on the Li metal anode and the highly conductive nature of the sulfur-rich interphase layer. (C) 2016 Elsevier B.V. All rights reserved.