SiO_x Based Anodes for Advanced Li-Ion Batteries: Recent Progress and Perspectives

SiO_x with high theoretical capacity is regarded as a promising high-performance anode material for lithium-ion batteries. The main problem is the dramatic volume expansion after lithiation and the inherent poor conductivity. Tackling these problems, extensive strategies are proposed for SiO_x-based anode materials in order to pursue high initial Coulombic efficiency, high reversible capacity, and long cycle stability. In this review, the lithium storage mechanism, merits, and disadvantages of SiO_x will be introduced in detail. Significant progress about SiO_x in recent years and their detailed strategies are summarized. Finally, challenges and potential solutions in the development and application of SiO_x are proposed. This review aims to offer a reference for the research of anode materials associated with SiO_x and offer a good guide for the further improvements of SiO_x anode materials.