Preparation and Electrochemical Performance of TiO2-B/Li Composite Anode for Li-ion Batteries
In this study,the synthesis and electrochemical properties of TiO2-B/Li composite anode were investigated.Lithium metal and TiO2-B were prepared into composite anodes with different ratios by both mechanical stirring and melt blending methods.By testing the multiplication performance and cycle stability of the half-cells,we found that the 5∶5 Li/TiO2-B composite anode prepared by the melt blending method exhibited the most excellent electrochemical performance.No obvious lithium dendrites and"dead lithium"formation were observed in this composite anode during the battery cycling.The half-cell composed of m(TiO2-B)∶m(Li)=5∶5 composite anode was able to stably cycle for 1 000 cycles at 3 mA·cm-2 and 1.5 mAh·cm-2,and the polarization voltage was maintained at about 68 mV.In addition,we also paired the TiO2-B/Li composite anode with the lithium-ion battery cathode material,NCM811,and lithium-sulfur battery cathode material,S@NC,and constructed a full-cell,and the full-cell was fabricated at 1.5 mV.The full battery was constructed and tested for cycling stability at current densities of 1 C and 0.5 C.The capacity retention rate was 85.37％and the capacity was 640.3 mAh·g-1 after 500 cycles at 1 C.Meanwhile,the capacity retention rate of the full battery of TiO2-B/Li-NCM811 was 83.32％after 500 cycles at 1 C.
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