Novel additives-package to mitigate the failure modes of high-capacity LiNi0.82Co0.11Mn0.07O2-based lithium-ion battery

Electrolyte additive strongly influences on energy density and cycle-life of state-of-the-art lithium-ion batteries (LIBs). Without additive, inevitable side reactions at nickel-rich cathode-electrolyte and anode-electrolyte interfaces result in non-satisfactory solid electrolyte interphase (SEI) formation and performance failure due to metal-dissolution from cathode particularly under multiply harsh condition of high voltages and temperatures. Herein, we report the design of a novel additives-package comprising of lithium borate, fluorinated anhydride and fluorinated phosphate at <= 1 wt% for a LIB with markedly improved capacity and performance. We show the synergy effects of individual additive in forming robust SEI layers at both 82% nickel (NCM-82) cathode and graphite anode under 4.35 V, 45 degrees C and 1C rate by compensating one's lacking role(s) by others'. Failure modes of NCM-82 chemistry LIBs such as high-voltage instability, metal-dissolution and cracks, surface and structural instability are mitigated, enabling high-capacity of 210 mAh g(-1) and high capacity retention of 94% after 100 cycles, with respect to reference electrolyte. Moreover, long cycle-life of 300 cycles of single-layer Li-ion pouch cell at 2C and 100 cycles of industrial pouch LIB (45 mAh cm(-2)) at 1C is achieved. Our design strategy for additives-package offers a promising path to long-cycled high-energy LIBs.