Synthesis and properties of Co-doped LiFePO4 as cathode material via a hydrothermal route for lithium-ion batteries

Local structures in mixed Li Fe1−M PO4 (M=Co, Ni) electrode materials

“…At y = 0.8, the impurity-phase content is < 3%, and for y = 1, several secondary peaks (< 14%) are observed, identified mainly as Ni 3 P and Li 4 O 7 P 2 . The increasing fraction of impurity phases with increasing y is in line with results reported in literature [16,17]. Phosphide secondary phases are commonly observed for LiCoPO 4 and LiNiPO 4 samples prepared by solid state synthesis when carbon coating is applied [18][19][20].…”

Insight into cobalt-doping in Li2FeSiO4 cathode material for lithium-ion battery

“…has been confirmed by some researchers [25e27]. It is commonly believed that Co doping can not only decrease the charge-transfer resistance and enhance the Li þ ion diffusion coefficient [25,27], but also improve the structural stability of cathode material and moderate the volume changes (expansion/contraction) during the reversible Li þ extraction/insertion [26]. Furthermore, Li 2 CoSiO 4 (with the same structural characteristics as triphylite) is also a potential candidate for cathode material of lithium ion batteries due to its high chargeedischarge potential (higher than 4.1 V) [28e30].…”

LiFe0.8Mn0.2PO4/C cathode material with high energy density for lithium-ion batteries

“…10 −9 to 10 −10 S cm −1 ) for LiFePO 4 leads to a poor rate capability. Numerous approaches have been devoted to optimizing the material for better electrochemical performance, such as coating conductive layer or metal oxides [4][5][6][7], doping with supervalent cations [8][9][10], and preparing nanoscaled particles [11][12][13].…”