A Novel High‐Performance TiO2‐x/TiO1‐yNy Coating Material for Silicon Anode in Lithium‐Ion Batteries

7. Clean energy 01 natural sciences 0104 chemical sciences
DOI: 10.1002/smtd.202200430 Publication Date: 2022-05-26T08:59:34Z
ABSTRACT
Protective surface coatings on Si anodes are promising for improving the electrochemical performance of lithium-ion batteries (LIBs). Nevertheless, most coating materials have severe issues, including low initial coulombic efficiency, structural fracture, morphology control, and complicated synthetic processing. In this study, a multifunctional TiO2-x /TiO1-y Ny (TTN) formed via facile scalable process is applied as material anodes. A thin layer amorphous TiO2 uniformly coated onto nanoparticles by simple sol-gel method then converted into two phase nitridation. The lithiated provides high ionic electrical conductivity, while TiO1-y can improve mechanical strength that alleviates volume change to address capacity fading issue. Owing these synergetic advantages, -coated (Si@TTN) exhibits excellent properties, charge 1650 mA h g-1 at 0.1 84% retention after 100 cycles 1 . Moreover, significantly enhanced rate be achieved current density. This investigation presents effective use high-capacity silicon anode in emerging technology LIBs.
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