Morphological solution for enhancement of electrochemical kinetic performance of LiFePO4

Hydrothermal synthesis of morphology-controlled LiFePO4 cathode material for lithium-ion batteries

“…The values were comparable to previously reported data (e.g. 10 À15 e10 À11 cm 2 s À1 by EIS, 10 À15 e10 À12 cm 2 s À1 by PITT) [24,25]. The results manifest that the nanoplates with the smallest size in the b-axis have the highest Li-ion diffusion coefficient.…”

Effects of carbon content on the electrochemical performance of LiFePO4/C core/shell nanocomposites fabricated using FePO4/polyaniline as an iron source

“…The Li-ion diffusion coefficients of the LiFePO 4 /C core/shell nanocomposites with the increase of the carbon shell thicknesses are extracted to be 1.47 Â 10 À12 , 3.96 Â 10 À12 , 1.01 Â 10 À11 , 8.74 Â 10 À12 , and 3.49 Â 10 À12 cm 2 s À1 , respectively, which are very comparable to the coefficients of the Li-ion diffusion extracted from the similar techniques reported previously. [48,49] The result clearly manifests that the Li-ion diffusion coefficient of LiFePO 4 /C core/shell nanocomposites initially increases with increase of the carbon shell thickness and then decreases with further increase of the carbon shell thickness. This is consistent with the conclusion presented above that the carbon coating can increase the ionic conductivity of the LiFePO 4 /C core/shell nanocomposites, however, the further increase of carbon coating could make the penetration of electrolyte solution into the carbon layers and the inward/outward diffusion of Li + ions difficulty.…”

“…The FTIR spectrum shown in Fig. 1a demonstrates that the obtained solid consists of PO 3À 4 , with a valence bonding resonance appearing at 1050 cm À1 [34,35], and a benzene ring, with a characteristic peak at 1405 cm À1 [36]. The broad absorption band at $3400 cm À1 with a strong intensity and the sharp absorption peak centered at 1625 cm À1 are attributed to the OÀH stretching and bending modes of water, [37] indicating that the obtained FePO 4 /PANI contains a small amount of water due to the strong hydrophilic property of PANI.…”

Morphology-controllable solvothermal synthesis of nanoscale LiFePO4 in a binary solvent

“…As shown in Figure 5(d), the peak current shows a good linear relationship with the square root of the scan rate, indicating that the Li-ion insertion/extraction in LFP is a diffusion-controlled process [25]. Therefore, the Li-ion diffusion coefficient is the most important factor to influence the electrode kinetics [26]. In order to investigate the ability of Li-ions to diffuse in the LFP materials, we calculate the…”