Rapid-rate Capability of Micro-/Nano-Structured CoO Anodes with Different Morphologies for Lithium-ion Batteries

摘要

In this study, special micro-ano-structured CoO powders with different morphologies (cube, sphereand spindle) have been synthesized successfully. All of micro-scale particles (cube, 1.0-4.0 m in edgelength; sphere, 3.0-7.0 m in diameter; spindle, 2.0-5.0 m in length and 1.0-3.0 m in width) are builtup by irregular nano-scale components (10-200 nm) attached to each other. Their specific surface areas2 -1 2 -1 2 -1 are about 4.99 m g , 5.01 m g and 15.74 m g , and their average pore sizes are about 1.89 nm, 1.63nm and 1.88 nm, respectively. By evaluation with electrochemical measurements, all of them possess-1 -1 -1 -1 high initial discharge capacities (1194.4 mAhg , 1208.5 mAhg and 1248.7 mAhg at 0.8 Ag ),among which the spindle CoO electrode exhibits the best rapid-rate capability (the discharge capacity-1 -1 retention ratios at 0.8 Ag after 50 cycles and at 1.6 Ag after 30 cycles are 87.3% and 77.7%).