Retracting interphasial stored Li+ ions by transition metal/metal carbide nanoparticles for enhanced Li+ ion storage capacity

Ni activated Mo2C by regulating the interfacial electronic structure for highly efficient lithium-ion storage

“…2(a 43,44 The high graphitization degree of Ni/Mo 2 C/NC indicates its high electronic conductivity and the electronic conductivity of Ni/ Mo 2 C/NC (4.21 × 10 4 S cm −1 ) is higher than that of Mo 2 C/NC (2.54 × 10 3 S cm −1 ), which were achieved using a resistivity tester, indicating that Ni can improve the graphitization of the carbon matrix and enhance the electronic conductivity of Ni/ Mo 2 C/NC. 31 The carbon content of Ni/Mo 2 C/NC is determined to be about 62.69 wt%, which was tested by thermogravimetric analysis (TGA) as shown in Fig. S2.…”

“…2(c). The peaks at 231.91 and 228.69 eV can be ascribed to Mo 2 C, 33,45 while the peaks at 232.66, 229.43, 236.04 and 233.23 eV corresponded to MoO x (MoO 2 and MoO 3 ), which may result from the surface oxidation of Mo 2 C. 20,46 However, the integral area of the Mo 2 C peak for Ni/Mo 2 C/NC is much larger than that of Mo 2 C/NC, indicating that Ni can be beneficial to the formation of Mo 2 C. 31 Fig. 2(d) exhibits high-resolution Ni 2p XPS spectra of Ni/Mo 2 C/NC, and the peaks at 854.12 and 872.20 eV correspond to Ni 0 .…”

“…29,30 Among these strategies, constructing heterostructures/hybrid materials by coupling materials with different properties has been recognized as an effective in improving both electronic conductivity and ion diffusion kinetics. 31–36 For example, Fe@Fe 3 C, Ni/Co–N, Ni–TiO 2 , MoO 2 /Mo 2 C, and Ni/MoO 2−σ MoO 2 /MoP can all exhibit excellent high-rate capability and long cycling performance due to their tunable electronic properties and superior electrochemical kinetics. Also, in our previous work, 37,38 we found that fabricating hybrid materials with an interfacial electric field can improve the electronic conductivity, and reduce the Li adsorption energy and the Li + diffusion barrier, thus improving the ion/electron kinetics and enhancing the electrochemical performance.…”

Review on Action Mechanism and Characterization of Natural/Artificial Solid Electrolyte Interphase of Lithium Battery: Latest Progress and Future Directions

“…With the promotion of various artificial SEI methods, the solution of the lithium dendrite problem has been simplified. Therefore, this review also looks forward to several possible solutions to the lithium dendrite problem at present and in the future. − Moreover, this review summarizes the number of articles on SEI research in the past two decades (Figure ).…”

Fe3C-Functionalized 3D Nitrogen-Doped Porous Graphene Nanocomposites as Anode Materials for Lithium-Ion Batteries

“…32,33 Incorporating Fe 3 C into the carbon matrix has been shown to improve the electrochemical performance of carbon-based anode materials. 34,35 Fe 3 C is believed to play a catalytic role in facilitating the reversible conversion of certain components in the solid electrolyte interface (SEI) layer during the charge and discharge process, thereby providing additional capacity beyond its theoretical limit for battery use (26 mA h/g for each unit that stores 1/6 Li). 2,36 capacity of 195 mA h/g was achieved after 200 cycles at a high current density of 2 A/g.…”