Li(Ni_(0.6)Co_(0.2)Mn_(0.2))O_(2) has been surface-modified by the lithium-ion conductor Li_(1.4)Al_(0.4)Ti_(1.6)(PO4)_(3) via a facile mechanical fusion method.The annealing temperature during coating process shows a...Li(Ni_(0.6)Co_(0.2)Mn_(0.2))O_(2) has been surface-modified by the lithium-ion conductor Li_(1.4)Al_(0.4)Ti_(1.6)(PO4)_(3) via a facile mechanical fusion method.The annealing temperature during coating process shows a strong impact on the surface morphology and chemical composition of Li(Ni_(0.6)Co_(0.2)Mn_(0.2))O_(2).The 600-℃ annealed material exhibits the best cyclic stability at high charging cut-off voltage of 4.5 V(versus Li^(+)/Li)with the capacity retention of 90.9%after 100 cycles,which is much higher than that of bare material(79%).Moreover,the rate capability and thermal stability are also improved by Li_(1.4)Al_(0.4)Ti_(1.6)(PO_(4))_(3) coating.The enhanced performance can be attributed to the improved stability of interface between Li(Ni_(0.6)Co_(0.2)Mn_(0.2))O_(2) and electrolyte by Li_(1.4)Al_(0.4)Ti_(1.6)(PO_(4))_(3) modification.The results of this work provide a possible method to design reliable cathode materials to achieve high energy density and long cycle life.展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2017YFB0102004)the National Natural Science Foundation of China(Grant No.51822211)the State Grid Technology Project,China(Grant No.DG71-17-010)
文摘Li(Ni_(0.6)Co_(0.2)Mn_(0.2))O_(2) has been surface-modified by the lithium-ion conductor Li_(1.4)Al_(0.4)Ti_(1.6)(PO4)_(3) via a facile mechanical fusion method.The annealing temperature during coating process shows a strong impact on the surface morphology and chemical composition of Li(Ni_(0.6)Co_(0.2)Mn_(0.2))O_(2).The 600-℃ annealed material exhibits the best cyclic stability at high charging cut-off voltage of 4.5 V(versus Li^(+)/Li)with the capacity retention of 90.9%after 100 cycles,which is much higher than that of bare material(79%).Moreover,the rate capability and thermal stability are also improved by Li_(1.4)Al_(0.4)Ti_(1.6)(PO_(4))_(3) coating.The enhanced performance can be attributed to the improved stability of interface between Li(Ni_(0.6)Co_(0.2)Mn_(0.2))O_(2) and electrolyte by Li_(1.4)Al_(0.4)Ti_(1.6)(PO_(4))_(3) modification.The results of this work provide a possible method to design reliable cathode materials to achieve high energy density and long cycle life.
