Strategies to Stabilize the Cathode/Electrolyte Interface in Ni-Rich NMC Based Li-Ion Batteries

Lithium ion batteries (LIBs) have been widely used in consumer electronics and electric vehicles due to their high energy density, high voltage, and environmental friendly nature, etc. Ni-rich layered cathode, LiNi x Mn y Co 1-x-y O 2 (NMC) has been considered as one of the most promising cathodes for high energy LIBs considering its high capacity (> 200 mAh g -1 ), high energy density (> 800 Wh kg -1 ), and reasonable cost comparing with other commercial cathodes. However, Ni-rich NMC-based batteries still exhibit significant capacity fade, especially under high voltage cycling conditions. This fade is related to the instability of cathode/electrolyte interface (CEI) and structure degradation induced by the continuous oxidation of electrolyte and dissolution of transition metal. To address aforementioned issues, some effective strategies including Atomic Layer Deposition (ALD) and usage of B-containing electrolyte additives have been presented in this work to suppress the interface reaction/transition metal dissolution. More details regarding to the interface stabilization in Ni-rich NMC-based LIBs using these strategies will be discussed in this work.