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In his study, we reported adiponitrile (ADN) as a novel electrolyte additive for the LiNi1/3Co1/3Mn1/3O2 cathode electrode in voltage ranges of 3.0-4.4 V, 3.0-4.6 V and 3.0-4.8 V. The electrochemical properties of the electrodes were investigated by linear sweep voltammetry (LSV), a charge/discharge test, electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). The results of this study showed that adding ADN to the electrolyte could effectively enhance the reversible capacity and cycling performance of the cathode electrode. The initial discharge capacities were 167.8 mAh g and 214.8 mAh g in electrolytes without and with 3% ADN, respectively. And the capacity retention rates were 68.4% and 70.4% at a voltage range of 3.0-4.6 V after 100 cycles in electrolytes without and with 3% ADN, respectively. The electrochemical performance was improved because of the compact and smooth solid electrolyte interface (SEI) film, which lowered the impedance between the cathode and the electrolyte by suppressing the decomposition of LiPF6 and improving the stability of EC. In addition, adding 3%ADN to the electrolyte was favourable for obtaining a lower Rct, which could promote the charge-transfer process by suppressing the interfacial reaction between the electrode and electrolyte.

Adiponitrile as a Novel Electrolyte Additive for High-Voltage Lithium-Ion Batteries