2, Kumoh National Institute of Technology, Gumi, , Korea (the Republic of)
Engineering of composite electrode for silicon anode materials plays an important role in the practical application of Si-based lithium-ion batteries (LIB). In this work, a hybrid composite anode of silicon-carbon-polyimide was in-situ fabricated by proper heat treatment of the slurry coat containing silicon power and polyamic acid polymer, without any carbon agent. The resulted film shows three components (silicon-carbon-polymer) composite structure wherein the hybrid carbon-polyimide is in-situ generated from polyamic acid by proper heat treatment. The hybrid Si composite exhibits robust binding and conductive properties, and also meso/macroporous internal structure enabling it to buffer Si volume expansion. When applied as LIB anode, it deliveres promising battery performance with little volume change even under high content of Si (>96wt%), which implies that the in-situ fabricatoin method could be another effective way for Si anode engineering for high energy density LIB.