Institute of New Energy and Power Battery, School of Materials Science and Engineering, Changsha University of Science & Technology, Changsha 410114, China
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.
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