Abstract
SiO2-coated LiNi0.7Mn0.15Co0.15O2 materials were successfully prepared by electrostatic attraction forces method via adjusting the Zeta potential between SiO2 and LiNi0.7Co0.15Mn0.15O2 in the suspension with the followed heating process. The structure, morphology, and electrochemical performances were characterized by XRD, SEM, TEM, XPS, CV, and EIS. As a result, compared with that with 71.4% capacity retention of bare materials, 1.0 wt% SiO2-coated LiNi0.7Co0.15Mn0.15O2 (NCM-S10) could deliver 184.50 mAh g−1 with 86.4% capacity retention after 100 cycles at 1 C over 3–4.5 V. In high temperature (55 °C), NCM-S10 also has 76.2% capacity retention after 100 cycles (3–4.5 V, 1 C), showing better cycling stability than that of the pristine (61.5%). The SiO2 coating layer efficiently inhibits side reaction between electrode and electrolyte and maintains the surface structure of LiNi0.7Co0.15Mn0.15O2. The increase in impedance is suppressed during the cycle, thereby enhances electrochemical properties of LiNi0.7Co0.15Mn0.15O2 in high voltage.
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