Three-dimensionally structure SnO₂-nanometer graphite flakes composite and its lithium storage properties

The SnO₂-nanometer graphite flakes composite has been prepared by a one-step microwave-hydrothermal method. The nanometer graphite flakes and SnO² nanoparticles form a three-dimensionally structure. The SnO₂ nanoparticles with the size of 3.3 nm uniformly distribute on the curly graphite flakes. The SnO₂-nanometer graphite flakes composite exhibits excellent electrochemical performances in lithium-ion batteries. The first discharge/charge capacity is 1739.9/973.5 mA h g^-1 at a current density of 100 mA g^-1, and the discharge specific capacity remains 656.6 mA h g^-1 after 100 cycles. The discharge specific capacities at the current densities of 300 and 500 mA g^-1 are 635.2 and 477.3 mA h g^-1 after 400 cycles, respectively, and all the specific capacities at different current densities begin to increase after the 50^th cycle. Its cycling performance is drastically enhanced.