Effect of Mg Shallow Doping on Structural and Magnetic Properties of LiFePO₄ Triphylite

Revealing the Ultrahigh Rate Performance of the La and Ce Co-doping LiFePO4 Composite

“…17 Besides, dual dopants can both widen the one-dimensional channel to reduce the charge transfer resistance and change the morphology and particle size of the material. 18 For instance, Chang et al found that the Li + diffusion coefficient is 18% higher than that of pure LiFePO 4 after Ni and V co-doping. 19 20 Rare earth doping is also an important route to enhance the intrinsic electric/ionic conductivity and improve the rate performance by not only tuning the shape and morphology of LiFePO 4 but also hybridizing the orbitals due to the existence of the forbital.…”

“…Meanwhile, dual dopants will produce a larger number of defects, increase the conductivity, and improve the ion diffusion rate while stabilizing the structure to enhance the electrochemical properties of the materials deriving from multiple doping superposition effects . Besides, dual dopants can both widen the one-dimensional channel to reduce the charge transfer resistance and change the morphology and particle size of the material . For instance, Chang et al found that the Li + diffusion coefficient is 18% higher than that of pure LiFePO 4 after Ni and V co-doping .…”

Review on Defects and Modification Methods of LiFePO4 Cathode Material for Lithium-Ion Batteries

“…When substitution with a different valence than the Fe ion is used, it produces an ion vacancy or a change in ion valence, which increases the lithiumion diffusion path and improves the mobility and diffusion coefficient of the ion. − Also, doping of Fe sites suppresses the tendency of crystal growth in the (010) plane, and the particles are flat and elongated, which facilitates ion diffusion along the b axis. Choi et al doped Mg ions at Fe sites and investigated the material structure and magnetic properties. It was noted that the presence of Mg 2+ states on the FeO 6 site reduced the charge density on the Fe nuclei, which led to a decrease in the lattice parameters.…”

“…130−132 Also, doping of Fe sites suppresses the tendency of crystal growth in the (010) plane, and the particles are flat and elongated, which facilitates ion diffusion along the b axis. Choi et al 133 doped Mg ions at Fe sites and investigated the material structure and magnetic properties. It was noted that the presence of Mg 2+ states on the FeO 6 site reduced the charge density on the Fe nuclei, which led to a decrease in the lattice parameters.…”

The decisive role of electrostatic interactions in transport mode and phase segregation of lithium ions in LiFePO4

“…[1][2][3] However, LiFePO 4 suffers from sluggish kinetics of charge transport, leading to poor intrinsic electronic conductivity (10 −9 -10 −10 S cm −1 ) and ionic diffusivity (10 −12 -10 −17 cm 2 s −1 ). [4][5][6][7][8][9] Substantial progress has been made over the past two decades to improve the rate performance of LiFePO 4 by surface coating, [10][11][12] ion doping, [13][14][15][16] and control of grain size. 17 It is worth noting that the electronic conductivity and ion diffusion rate increase simultaneously, which signies a synergy between ion transport and electron transfer (ET).…”