Physical and electrochemical characterization of 0.3Li2MnO3 x 0.7LiMn0.60Ni0.25Co0.15O2 material for Li secondary battery.
The 0.3Li2MnO3 x 0.7LiMn0.60Ni0.25Co0.15O2 cathode materials were synthesized using a coprecipitation method at a various heat-treatment temperature. From XRD pattern analysis, pure layered structure without impurities was confirmed from all samples and the peak intensity of Li2MnO3 was increased as the heat-treatment temperature increased. The primary particle size increased approximately from 100 nm to 500 nm with increasing heat-treatment temperature. The initial discharge capacity of the materials obtained at 950 degrees C was 235 mA h/g at 0.1 C rate, but then decreased down to 228 mA h/g with further increasing heat-treatment temperature. And, in the voltage range of 2.0-4.6 V, the electrode heat-treated at 900 degrees C showed the highest capacity retention of 68% at 5 C rate against to 0.1 C rate.
Jeong-Min
JM
Kim
Man-Soo
MS
Choi
Bong-Soo
BS
Jin
Guoxiu
G
Wang
Hyun-Soo
HS
Kim