Construction of Macroporous Co₂SnO₄ with Hollow Skeletons as Anodes for Lithium-Ion Batteries

Increasing the energy density of lithium-ion batteries (LIBs) can broaden their applications in energy storage but remains a formidable challenge. Herein, with polyacrylic acid (PAA) as phase separation agent, macroporous Co₂SnO₄ with hollow skeletons was prepared by sol-gel method combined with phase separation. As the anode of LIBs, the macroporous Co₂SnO₄ demonstrates high capacity retention (115.5% at 200 mA·g^-1 after 300 cycles), affording an ultrahigh specific capacity (921.8 mA h·g^-1 at 1 A·g^-1). The present contribution provides insight into engineering porous tin-based materials for energy storage.