Improving the electrochemical performance of lithium vanadium fluorophosphate cathode material: Focus on interfacial stability

Chemical reaction characteristics, structural transformation and electrochemical performances of new cathode LiVPO4F/C synthesized by a novel one-step method for lithium ion batteries

“…It is much lower than the traditional two-step reduction, in which the addition of carbon is about 20-50 wt%. 4,12,31 Assuming that if the structure, real density and tap density of pyrolytic carbon and LiVPO 4 F in this study are similar to those reported in literature and the tap density of LiVPO 4 F/C is primarily determined by the content of residual carbon with low density, it is understandable that the tap density of LVPF800 will be evidently higher than the samples prepared by the two-step method.…”

“…The capacity at 5C is 116.5 mA h g À1 , which proves to be an excellent value compared with the literature. 31 It is noted that the residual carbon in LVPF800 is 11.76 wt%. It is much lower than the traditional two-step reduction, in which the addition of carbon is about 20-50 wt%.…”

An Ostwald ripening route towards Ni-rich layered cathode material with cobalt-rich surface for lithium ion battery

“…In addition, these nickel-rich cathodes suffer from gradual capacity fading with cycling due to their structural instability, which is ascribed to the successive phase transitions from hexagonal 2 (H2) to hexagonal 3 (H3) phases when large amounts of Li + are extracted from the host structure [28][29][30][31][32][33]. To solve these problems, various approaches including structure tuning [34][35][36], substitution [37][38][39], and surface coating [40][41][42][43][44][45] have been proposed. Metal oxides such as Al 2 O 3 [46,47], ZrO 2 [48], MgO [49], have been studied as coating materials.…”

Effect of Hydrofluoric Acid Etching on Performance of Si/C Composite as Anode Material for Lithium-Ion Batteries

“…The increasing demands for electric vehicles (EVs) and hybrid electric vehicles (HEVs) have resulted in extensive research on the high-energy lithium-ion batteries (LIBs), considering that rechargeable LIBs almost dominate the portable electronic and electric vehicle markets [1][2][3]. Various methods have been reported to improve device performance [4][5][6][7][8]. However, as an important part of LIBs, commercialized graphite anodes have limited application because of their low theoretical specific capacity (372 mAh g −1 ) and security issues, which cannot satisfy the growing demands of highenergy application fields [9].…”