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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This study was financially supported by the Government of Chongzuo, Guangxi Zhuang Autonomous Region (GC Joint Special Fund No. FA2019015), and Science and Technology Department of Guangxi Zhuang Autonomous Region (Guangxi Special Fund for Scientific Center and Talent Resources, No. AD18281073).
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Li, W., Li, Y., Yang, L. et al. Enhancing high-voltage electrochemical performance of LiNi0.7Mn0.15Co0.15O2 cathode materials with SiO2 coatings via electrostatic attraction forces method. Ionics 26, 5393–5403 (2020). https://doi.org/10.1007/s11581-020-03657-8
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DOI: https://doi.org/10.1007/s11581-020-03657-8