High-performance silicon diphosphide/nanocarbon composite anode for Li-ion batteries: Role of chemical bonding and interfaces in the establishment of cycling stability

摘要: Abstract Silicon diphosphide (SiP2), a next-generation anode material for lithium ion batteries, exhibits high theoretical specific capacity (2900 mAh g−1), however, its is rapidly faded due to large volume change. An effective way improve the electrochemical performances of SiP2 composite with carbon buffer. In composite, chemical bonds and are expected maintain connections during cycling, thereby, provide electron conduction pathways even under change SiP2. However, effect not clearly understood. Thus, it very important distinguish contributions buffer properties Herein, composites nanocarbon prepared without between by controlling ball milling parameter an aim investigate respective contribution The SiP2/nanocarbon P–O–C Si–O–C shows great improvement electrode over bonds. Furthermore, SiP2–nanocarbon interface found facilitate fast conduction, overcoming issues associated ionically insulative LiP.