High-capacity SiO (0≤x≤2) as promising anode materials for next-generation lithium-ion batteries

Abstract Lithium-ion battery with high energy density is highly desirable to meet the increasing demand of electric vehicles and electronic devices. The SiOx (0≤x≤2) anode has been a growing interest in the development of high-performance lithium-ion batteries due to its ultrahigh theoretical lithium storage capacity, low working potential, earth-abundant and good environmental compatibility. However, low initial Coulombic efficiency and severe capacity fading in cycling are found in the Si-based anode materials, thereby limiting the practical application of the SiOx anode materials. Tremendous efforts have been devoted to revealing the reasons for their unsatisfactory electrochemical lithium storage performance and providing corresponding solutions. This review attempts to deliver better understanding in term of the electrochemical lithium storage behaviors, lithium storage mechanism, failure mechanism of the SiOx anodes. Possible solutions to electrochemical problems of Si-based anode materials are also highlighted.