Hydrothermal-assisted synthesis of surface aluminum-doped LiCoO2 nanobricks for high-rate lithium-ion batteries

LiCoO2 nano-particles precursor was synthesized through a mixed-alkalis (LiOH-NaOH) hydrothermal reaction, and finally sintered into LiCoO2 nanobricks with a sickness of similar to 300 nm. This LiCoO2 nanobrick cathode delivered a specific capacity of 131.8 mAh g(-1) at 1 C between 3.0 and 4.2 V and 90% capacity retention after 100 cycles. Those synthesized LiCoO2 nanobricks were further treated by surface Al3+ doping to achieve much enhanced 4.5 V lithium storage capability and cycling stability. EIS results showed the surface Al3+ doping operation can signification decrease the charge-transfer resistances of the LiCoO(2 )cathodes for both before and after cyclings.