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

• DOI: 10.1002/smtd.202200430
• Publication Date: 2022-05-26T08:59:34Z
• Authors: Sung Eun Wang; Min Ji Kim; Jin Woong Lee; Jinyoung Chun; Junghyun Choi; Kwang Chul Roh; Yun Chan Kang; Dae Soo Jung
• Keywords: 7. Clean energy; 01 natural sciences; 0104 chemical sciences

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.