Li_xV₂O₅/LiV₃O₈ nanoflakes with significantly improved electrochemical performance for Li-ion batteries

Abstract

A novel strategy involving the self-transformation of superficial LiV3O8 in a reducing atmosphere (H2/Ar) was reported to fabricate core–shell structured LixV2O5/LiV3O8 nanoflakes. The cycling stability and rate performance were significantly improved.

The effect of nitrogen annealing on lithium ion intercalation in nickel-doped lithium trivanadate

“…Third, the sample annealed in nitrogen atmosphere shows higher BET surface area with smaller particles, and it shortens the diffusion pathway for lithium ions so that the composition and the stress gradient are reduced. Lastly, the presence of parasitic secondary phase, LiV 2 O 5 , may serve as a buffer to circumvent the volume change associated with the lithium ion intercalation and deintercalation [39,40]. Although the presence of the secondary phase in LVO cathode material is believed to improve its cyclic life, it is required to have more research to get a better fundamental understanding of the real mechanism.…”

Multi-layered Al2O3/LixV2O5/LiV3O8 nanoflakes with superior cycling stability as cathode material for Li-ion battery

“…For the discharge curves, a plateau around 2.1 V appears with cycling number increasing. The variations of the plateaus imply possible structure rearrangement during the cycling, which was also observed in our previous paper [31].…”

“…The XRD patterns of bare LiV 3 [31][32][33][34]. There is no other impurity diffraction line, indicating the high purity of LiV 3 O 8 .…”

“…Li x V 2 O 5 /LiV 3 O 8 composite was fabricated by a facial H 2 treatment of LiV 3 O 8 and the composite demonstrated significantly improved electrochemical properties [31]. The results revealed that the surface Li x V 2 O 5 with certain thickness could not only protect the internal LiV 3 O 8 from dissolution, but also increase the Li-ion diffusion coefficient and suppress the charge-transfer resistance [31]. Therefore, the improved cycling stability of Al 2 O 3 /Li x V 2 O 5 / LiV 3 O 8 electrode could be attributed to the double protection of Al 2 O 3 and Li x V 2 O 5 layers.…”

High-energy cathode materials for Li-ion batteries: A review of recent developments

“…As a typical multi-valence transition metal element, vanadium shows active chemical properties with various oxides and oxysalts, for example, VO 2 [154][155][156][157][158], V 2 O 5 [159][160][161][162][163][164][165], V 3 O 7 [167][168][169][170][171], V 4 O 9 [172,173], V 6 O 13 [174][175][176][177][178][179][180], Li 1+x V 3 O 8 [181][182][183][184][185][186][187][188], Li x VO 2 with layered structure [189191], Li x V 2 O 4 with spinel structure [192][193][194] and LiMVO 4 (M= Ni, Co) with inverse spinel structure [195][196][197][198][199]. Most of these compounds are lithium-intercalation materials, which refers to a good host for the reversible insertion and extraction of Li + [200][201][202].…”