SiO₂-coated LiNi_0.7Mn_0.15Co_0.15O₂ materials were successfully prepared by electrostatic attraction forces method via adjusting the Zeta potential between SiO₂ and LiNi_0.7Co_0.15Mn_0.15O₂ 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 LiNi_0.7Co_0.15Mn_0.15O₂ (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 LiNi_0.7Co_0.15Mn_0.15O₂. The increase in impedance is suppressed during the cycle, thereby enhances electrochemical properties of LiNi_0.7Co_0.15Mn_0.15O₂ in high voltage.

通过调节悬浮液中SiO ₂和LiNi _0.7 Co _0.15 Mn _0.15 O ₂之间的Zeta电位，并随后进行加热工艺，通过静电引力法成功制备了SiO ₂包覆的LiNi _0.7 Mn _0.15 Co _0.15 O ₂材料。通过XRD，SEM，TEM，XPS，CV和EIS对结构，形貌和电化学性能进行了表征。结果，与裸材料的容量保持率为71.4％的结果相比，涂覆有1.0 wt％SiO ₂的LiNi _0.7 Co _0.15 Mn _0.15 O₂（NCM-S10）可以提供184.50 mAh g ^-1，在1 C下在3-4.5 V电压下运行100次后，容量保持率为86.4％。在高温（55°C）下，NCM-S10在100°C后仍具有76.2％的容量保持率循环（3–4.5 V，1 C），显示出比原始（61.5％）更好的循环稳定性。SiO ₂涂层有效地抑制了电极与电解质之间的副反应，并维持了LiNi _0.7 Co _0.15 Mn _0.15 O ₂的表面结构。在循环过程中抑制了阻抗的增加，从而增强了LiNi _0.7 Co _0.15 Mn _0.15 O _2的电化学性能 在高压下。