Description:
The unstable cathode electrolyte interphase (CEI) layer on the surface of V2O5 limits its Li+ storage capability. Herein, a novel aminoakyldisiloxane compound, (3-(N,N-dimethylamino)diethoxypropyl) pentamethyldisiloxane (DSON), is applied as an efficient electrolyte additive for enhancing the electrochemical performance of V2O5. DSON additive in the conventional carbonate-based electrolyte can inhibit the generation of HF by suppressing the hydrolytic process of LiPF6, preventing the V2O5 electrode/current collector from corrosion. Additionally, DSON can also induce the formation of Li-N bond in CEI layer of the surface for V2O5 electrode upon (de)lithiation, lowering the charge transfer resistance of Li+ at the interface between electrode and electrolyte, respectively. Thus, the V2O5 electrode with the electrolyte containing DSON additive (0.5 wt%) delivers a higher specific capacity (311.8 mAh g-1 at 0.1 C), excellent cycling performance (248.1 mAh g-1 at 0.5 C after 250 cycles) and rate performance (235.9 mAh g-1 at 2C). This work demonstrates that aminoakyldisiloxane is an effective electrolyte additive to stabilize the surface electrolyte film and improve the Li+ storage capability of metallic oxide-based electrode materials