Effect of carbon coating on LiNi1/3Mn1/3Co1/3O2 cathode material for lithium secondary batteries

Improvement of the electrochemical performance of LiNi0.33Mn0.33Co0.33O2 cathode material by chromium doping

“…However, its rate capability and cycling performance at high current density are not satisfactory [7,8]. The origin of these phenomena is mainly related to its low electronic conductivity, transitional metal ions dissolution into the electrolyte and the instability of the surface layer between the active particles and the electrolyte solution [9][10][11][12][13]. It has been reported that one way to upgrade the electrochemical performance of lithium transition metal composite oxides is to partially substitute transition metals with Mg 2+ , Ti 4+ , Al 3+ , and Zn 2+ , which may stabilize the layered structure without participating in the electrochemical reaction [14][15][16][17].…”

Surface of LiCo1/3Ni1/3Mn1/3O2 modified by CeO2-coating

“…Coating cathode material with metal oxides is an effective way to stabilize the layered structure and prevent unwanted reaction between cathode and electrolyte [7][8][9][10]. CeO 2 could produce a good electrical contact between oxides that facilities electron transfer between CeO 2 and the supported metal oxide [11].…”

Electrochemical properties of α-MoO3-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode material for Li-ion batteries

“…As is known, the intercept of the semicircle at the highest frequency with the real axis(Z") refers to uncompensated ohmic resistance (R s ) between the working electrode and the reference electrode, R sf is the resistance for lithium-ion diffusion in the surface layer(including SEI layer and surface modification layer), CPE sf is constant phase-angel element depicting the non-ideal capacitance of the surface layer, R ct is the charge-transfer resistance, CPE dl is the constant phase-angel element depicting non-ideal capacitance of the double layer. The rising line in the low-frequency region is assigned to Warburg impedance (Zw [46].…”