【摘要】 针对锂枝晶不可控生长的问题，采用改性后的纳米无机固体电解质锆酸镧锂(LLZTO)与PE隔膜结合制备了锆酸镧锂涂层隔膜。通过X射线衍射、扫描电子显微镜对不同厚度LLZTO/PE涂层隔膜进行表征，并对组装的扣式电池进行循环伏安、交流阻抗及电化学充放电测试。结果表明，锆酸镧锂涂层隔膜在部分区间厚度内的电化学性能均有所提高，且在不同倍率下放电比容量和容量保持率都有明显改善。在隔膜最佳厚度为20μm时，0.1 C下首次放电比容量为163.94 mAh/g, 1 C的电流密度下循环100圈后容量保持率为102.25%,明显提升了电池的循环寿命。更多还原

【Abstract】 To solve the problem of uncontrolled growth of lithium dendrites, lithium lanthanum zirconate（LLZTO） coating diaphragm is prepared through combining LLZTO,a modified nano inorganic solid electrolyte, with polyethylene membrane.The prepared LLZTO/PE coating diaphragm with different thicknesses is characterized by means of X-ray diffraction and scanning electron microscopy.Cyclic voltammetry, electrochemical impedance spectroscopy, and electrochemical charge discharge testing are conducted on the button type battery assembled with the prepared coating diaphragm.Results show that the electrochemical performance of the tantalum-doped LLZTO coating diaphragm in some thickness ranges is improved, and the discharge specific capacity and capacity retention rate are significantly improved at different rates.At a diaphragm thickness of 20 μm, the first discharge specific capacity of the diaphragm is 163.94 mAh·g^-1 at 0.1 C,and the capacity retention rate after 100 cycles at a current density of 1 C is 102.25%,significantly improving the cycling life of the battery.更多还原