Ru‐ and Cl‐Codoped Li₃V₂(PO₄)₃ with Enhanced Performance for Lithium‐Ion Batteries in a Wide Temperature Range

Abstract

in situ X-ray diffraction (XRD), ionic codoping, Li 3 V 2 (PO 4 ) 3 , theoretical calculations, wide temperature range

Synergistic Strain Suppressing and Interface Engineering in Na4MnV(PO4)3/C for Wide-Temperature and Long-Calendar-Life Sodium-Ion Storage

“…The carbon properties of the five produced materials were studied by using Raman spectroscopy, as apparent in Figure S3c. Two typical Raman characteristic peaks of carbon are found at ∼1590 cm –1 (G-band) and ∼1340 cm –1 (D-band), and their peak intensities reflect the high degree of graphitization, which helps to improve conductivity . In addition, the N 2 sorption isotherm and pore size distribution of NMVP/C materials with and without Zr doping are exhibited in Figure S4.…”

“…Two typical Raman characteristic peaks of carbon are found at ∼1590 cm −1 (G-band) and ∼1340 cm −1 (D-band), and their peak intensities reflect the high degree of graphitization, which helps to improve conductivity. 38 In addition, the N 2 sorption isotherm and pore size distribution of NMVP/C materials with and without Zr doping are exhibited in Figure S4. In contrast, the Zr doping marginally increases the specific surface area of NMVZP/C-0.05 with a maximum specific surface area of 84.7 m 2 g −1 , higher than that of NMVP (73.5 m 2 g −1 ), making it more conducive to the penetration of electrolyte into the active material.…”

Intertwined CNT Assemblies as an All-Around Current Collector for Volume-Efficient Lithium-Ion Hybrid Capacitors

“…To identify the mechanisms for improving the power performance by introducing CNT-based current collectors, electrochemical impedance spectroscopy (EIS) measurements at an applied potential of 1.0 V (vs Li/Li + ) are conducted (Figure E). The Li-ion diffusion coefficient ( D ), which directly affects the transport kinetics of Li + ions, is calculated from the inclined lines in the low-frequency region by using the following equation − D = R 2 T 2 / 2 normalA 2 n 4 F 4 C 2 σ 2 where R , T , A , n , F , C , and σ are the ideal gas constant, absolute temperature, cumulative electrode area, number of electrons, Faraday constant, Li + ion concentration, and Warburg factor, respectively. Because all the variables except for σ are identical for both CNT-based and conventional electrodes, the diffusivity is solely dependent on the Warburg factor.…”

How About Vanadium‐Based Compounds as Cathode Materials for Aqueous Zinc Ion Batteries?

“…[ 94 , 95 , 96 , 97 , 98 ] In recent years, the NASICON‐type phosphate structure has been used as cathode materials to store monovalent metal ions, such as Li + , Na + , and K + . [ 99 , 100 , 101 ] Relevant studies show that the radius of Na + (0.98 Å) is larger than that of Zn 2+ (0.74 Å), indicating that Zn 2+ has great potential in the framework of NASICON‐type phosphates. [ 102 ] In addition, the NASICON‐type phosphate structure has a higher energy density and redox potential than the homologous vanadium oxides because of the strong inducible effect of PO 4 3− polyanion and the strong P—O bond.…”