LiNi0.8Co0.1Mn0.1O2(NCM811)is a cathode material with a high specific capacity for high nickel lithium battery,but exists a few problems in the application,such as cationic mixing and surface structure instability.The impact of methyl trimethoxy-silane(MTMS)as an electrolyte additive on the electrochemical performance and cathode surface properties of Li/NCM811 battery are examined through using a lithium metal sheet as negative electrode and 1M LiPF6-EC∶DEC(1∶1)as electrolyte.It is found through study that the capacity retention rate of battery increases by 131.95％after adding 4 wt.％MTMS into the electrolyte,and charging and discharging 100 cycles at 0.5 C current.It is verified through electrochemical testing,and the characterization of electrode surface properties before and after the reaction that MTMS additive agent is beneficial to form the stable and dense CEI film on the surface of NCM811 and can inhibit the decomposition of the electrolyte,which protects the chemical stability of the active sites and inhibits the irreversible phase transition of electrode material.
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