Abstract
Carbon coated Li1.2Mn0.56Ni0.16Co0.08O2 and Li1.2Mn0.6Ni0.2O2 were synthesized as cathode materials for Li-ion batteries by a self-combustion reaction, and were characterized by XRD, SEM, HRTEM and Raman spectroscopy in conjunction with electrochemical measurements. Initial discharge specific capacities of 270 mAh g−1 and 230 mAh g−1 are obtained for Li1.2Mn0.56Ni0.16Co0.08O2 and Li1.2Mn0.6Ni0.2O2, respectively at slow rates (e.g.C/10) in galvanostatic charge-discharge cycling. The cathode material Li1.2Mn0.56Ni0.16Co0.08O2 can provide a discharge capacity of 110 mAh g−1 at 4C rate. The importance of the presence of Co in the structure for obtaining high rate capabilities was proven by comparison with Li1.2Mn0.6Ni0.2O2 electrodes, which can exhibit only 80 mAh g−1 at 2C rate. The electrochemical impedance spectra of Li1.2Mn0.56Ni0.16Co0.08O2 recorded at various potentials during charging indicate that there is a substantial increase in the charge-transfer resistance at voltages higher than 4.4V, indicating that the kinetics of Li+ ions insertion into this material is controlled by charge-transfer rather than by Li+ ions diffusion, at high potentials.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
