The effects of cycle potential window on electrochemical behaviors,structural characteristics,and surface changes in Li[Ni_(0.133)Li_(0.2)Co_(0.133)Mn_(0.533)]O_(2)(or 0.5 Li_(2)MnO_(3)·0.5 Li(Co_(0.333)Ni_(0.333...The effects of cycle potential window on electrochemical behaviors,structural characteristics,and surface changes in Li[Ni_(0.133)Li_(0.2)Co_(0.133)Mn_(0.533)]O_(2)(or 0.5 Li_(2)MnO_(3)·0.5 Li(Co_(0.333)Ni_(0.333)Mn_(0.333))O2)in lithium-ion battery were investigated.Two flat charge potential plateaus,~3.9 and~4.5 V,are observed in the initial charge curves of the cells.Sharp changes in specific capacity and columbic efficiency are presented at~4.5 V during the first cycle.XRD specific peaks show an obvious shift with the increase in charge cutoff potential.When the charge cutoff potential is above4.4 V,the cycle performance decreases with the increase in charge cutoff potentials.A film with the composition of C and O elements is observed on the cycled composite particle.展开更多
基金financially supported by the HiTech Research and Development Program of China (No. 2011AA11A254)
文摘The effects of cycle potential window on electrochemical behaviors,structural characteristics,and surface changes in Li[Ni_(0.133)Li_(0.2)Co_(0.133)Mn_(0.533)]O_(2)(or 0.5 Li_(2)MnO_(3)·0.5 Li(Co_(0.333)Ni_(0.333)Mn_(0.333))O2)in lithium-ion battery were investigated.Two flat charge potential plateaus,~3.9 and~4.5 V,are observed in the initial charge curves of the cells.Sharp changes in specific capacity and columbic efficiency are presented at~4.5 V during the first cycle.XRD specific peaks show an obvious shift with the increase in charge cutoff potential.When the charge cutoff potential is above4.4 V,the cycle performance decreases with the increase in charge cutoff potentials.A film with the composition of C and O elements is observed on the cycled composite particle.
