Although
LiNi0.8Co0.1Mn0.1O2 (NCM811)
has been widely used in lithium-ion batteries
(LIBs)
as cathode materials, the high content of nickel typically leads to
performance deterioration and other safety issues due to the catalytic
decomposition of electrolyte. Herein, we propose a strategy to improve
the stability of electrolyte by adopting anhydride-based additives
with benzene group (e.g., 6FDA, FPA, and PSA). The theoretical calculation,
electrochemical test, and structural characterization indicate that
the addition of PSA enables NCM811 to better cycling performance at
high, ambient, and low temperatures for pouch cells with SiO/graphite
as the anode owing to its higher reduction potential in comparison
with that of 6FDA and FPA.