Co 3 O 4 /onion-like carbon (OLC) nanocomposites with a high surface area of 222.83 m 2 g À1 were synthesized by a simple solvothermal method for application as an anode material in lithium ion batteries (LIBs). The electrochemical properties of the hybrid nanocomposites were investigated by a half-cell LIB configuration with lithium foil as the counter electrode. The result shows improved battery performance including enhanced specific capacity (i.e., $632 mA h g À1 at the 100 th cycle with a current density of 200 mA g À1 ) and excellent cycling stability, which are attributed to good conductivity and fast ion transportation of the nanocomposites. Remarkably, this new anode material also exhibited an extremely high rate capability at various current densities from 50 to 2000 mA g À1 . These results suggest that such a Co 3 O 4 /OLC hybrid composite architecture is promising for next generation high capacity and safe LIBs.
Experimental detailsThe Co 3 O 4 /OLC nanocomposites were synthesized through a simple solvothermal method. Briey, 50 mg OLC was rstly
One internal friction peak associated with the B2↔B19’ transformation appears on the cooling curve of porous NiTi shape memory alloy and the dense NiTi alloy shows the maximum peak. The tan δ value increased with the increasing of strain amplitude and the decreasing of frequency. Tan δ value of porous alloy mainly comes from the energy absorbing of the matrix at the small strain amplitude, however, if the strain amplitude is large, the tan δ value comes from the energy consumption that overcomes the friction between folds and the plastic contribution.
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