Lithium cobalt phosphate (LiCoPO) has great potential to be developed as a cathode material for lithium-ion batteries (LIBs) due to its structural stability and higher voltage platform with a high theoretical energy density. However, the relatively low diffusion of lithium ions still needs to be improved. In this work, Fe and Zn co-doped LiCoPO: LiCoFeZnPO/C is utilized to enhance the battery performance of LiCoPO. The electrochemical properties of LiCoFeZnPO/C demonstrated an initial capacity of 118 mAh/g, with 93.4 % capacity retention at 1C after 100 cycles, and a good capacity of 87 mAh/g remained under a high current density of 10C. In addition, the diffusion rate of Li ions was investigated, proving the improvement of the materials with doping. The impedance results also showed a smaller resistance of the doped materials. Furthermore, operando X-ray diffraction displayed a good reversibility of the structural transformation, corresponding to cycling stability. This work provided studies of both the electrochemical properties and structural transformation of Fe and Zn co-doped LiCoPO, which showed that 10 % Fe and 5 % Zn co-doping enhanced the electrochemical performance of LiCoPO as a cathode material in LIBs.
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http://dx.doi.org/10.1016/j.jcis.2024.04.173 | DOI Listing |
ACS Omega
September 2024
Department of Chemical Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan.
Nanostructured LiCoPO (LCP) microspheres were successfully synthesized by one-step spray pyrolysis, adding an appropriate amount of diammonium hydrogen citrate (DHC) additive to the precursor solution. Comprehensive physical characterization confirmed that the obtained LCPs exhibited a desirable orthorhombic olivine structure with nanostructured morphology and a significant increase in specific surface area. This enhancement was attributed to the dispersion effect due to the carboxyl group and the evolution of the ammonium group of DHC during the pyrolysis process.
View Article and Find Full Text PDFJ Colloid Interface Sci
September 2024
Department of Materials Science and Engineering, National Tsing Hua University, 101, Sec. Kuang-Fu Road, Hsinchu 300044, Taiwan. Electronic address:
Lithium cobalt phosphate (LiCoPO) has great potential to be developed as a cathode material for lithium-ion batteries (LIBs) due to its structural stability and higher voltage platform with a high theoretical energy density. However, the relatively low diffusion of lithium ions still needs to be improved. In this work, Fe and Zn co-doped LiCoPO: LiCoFeZnPO/C is utilized to enhance the battery performance of LiCoPO.
View Article and Find Full Text PDFNanomaterials (Basel)
December 2023
Department of Energy & Materials Engineering, Dongguk University, Seoul 04620, Republic of Korea.
A solid-solution cathode of LiCoPO-LiNiPO was investigated as a potential candidate for use with the LiTiO (LTO) anode in Li-ion batteries. A pre-synthesized nickel-cobalt hydroxide precursor is mixed with lithium and phosphate sources by wet ball milling, which results in the final product, LiNiCoPO (LNCP) by subsequent heat treatment. Crystal structure and morphology of the product were analyzed by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM).
View Article and Find Full Text PDFRSC Adv
May 2023
Department of Applied Chemistry, Tokyo Metropolitan University 1-1 Minamiosawa Hachioji Tokyo 192-0397 Japan
Membrane emulsification using anodic porous alumina is an effective method for preparing monodisperse droplets with controlled sizes. In this study, membrane emulsification using anodic porous alumina was applied to the preparation of size-controlled particles composed of composite metal oxides. To obtain size-controlled composite metal oxide particles, membrane emulsification was performed using an aqueous solution containing a water-soluble monomer and metal salts as a dispersed phase.
View Article and Find Full Text PDFSci Rep
February 2023
The Smart Materials Research Institute, Southern Federal University, Sladkova, Russia.
Lithium-ion batteries based on high-voltage cathode materials, such as LiCoPO, despite being promising in terms of specific power, still suffer from poor cycle life due to the lower stability of common non-aqueous electrolytes at higher voltages. One way to overcome this issue might be decreasing the working potential of the battery by doping LiCoPO by Fe, thus reducing electrolyte degradation upon cycling. However, such modification requires a deep understanding of the structural behavior of cathode material upon lithiation/delithiation.
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