Optimizing the carbon coating on LiFePO4 for improved battery performance

Enhanced electrochemical properties of LiMnPO4/C composites by tailoring polydopamine-derived carbon coating

“…Meanwhile, the rough surface morphology of the carbon coating for all the samples, especially the one with the thickness in wide range for LMP/C-6, may also be ascribed to the competition between the deposition and the aggregation of polydopamine. The as-obtained polydopamine-derived carbon coating is less uniform than the previously reported one with Fe-containing compounds as the substrate [17][18][19]. This phenomenon may be attributed to the poorer adsorption capability of Mncontaining groups towards the active chemical groups during the formation of polydopamine.…”

“…In our experiments, the maximum thickness of relatively uniform carbon coating layer is about 3-5 nm (LMP/C-3), whereas previous works have reported up to 10 nm thick uniform carbon coating along with high carbon content when using higher initial concentration of dopamine monomer and longer polymerization time [17][18]. Nevertheless, owing to the electrochemical inactive nature of carbon, the as-obtained full carbon coating as well as the reduced carbon content in our experiments may be more beneficial to improve the electrochemical properties of LiMnPO4.…”

“…Recently, dopamine, a biomolecule that owns extremely strong adhesive properties benefiting from the coexistence of catechol and amine functional groups, has become attractive in the preparation of carbon coating for electrode materials [17][18][19]. It can spontaneously selfpolymerize into polydopamine under alkaline conditions with oxygen as the oxidant, and deposit an adherent film on various surfaces by forming strong covalent/non-covalent bonds with the substrate [20][21].…”

Calendering effect on the electrochemical performances of the thick Li-ion battery electrodes using a three dimensional Ni alloy foam current collector

“…Lithium iron phosphate (LiFePO 4 ) as a very promising active material attracts much attention for electrical vehicles because of its low toxicity, high safety, potentially low cost, excellent life cycle, high structural stability, and large theoretical capacity (170 mA h g À1 ), among others [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. However, the kinetic performance of LiFePO 4 suffers significantly from poor electronic conductivity and slow lithium-ion transport.…”

“…However, the kinetic performance of LiFePO 4 suffers significantly from poor electronic conductivity and slow lithium-ion transport. To overcome the disadvantages, the performance was improved by decreasing the particle size, performing a surface modification, doping with other elements, coating with conductive material, and so on [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Nevertheless, to be useful for electric vehicles or high power energy storage, the active material of a Li-ion battery should be coated with a foil type current collector that is much thinner, and its electrode area should be large enough to meet the high power performance with a sufficient capacity.…”