TY - JOUR
T1 - Vanadium Organometallics as an Interfacial Stabilizer for Ca xV2O5/Vanadyl Acetylacetonate Hybrid Nanocomposite with Enhanced Energy Density and Power Rate for Full Lithium-Ion Batteries
AU - Wang, Xinran
AU - Bai, Ying
AU - Wu, Feng
AU - Wu, Chuan
N1 - Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/7/3
Y1 - 2019/7/3
N2 - Vanadium pentoxide (V2O5) offers high capacity and energy density as a cathode candidate for lithium-ion batteries (LIBs). Unfortunately, its practical utilization is intrinsically handicapped by the low conductivity, poor electrode kinetics, and lattice instability. In this study, the synergistical optimization protocol has been proposed in the conjunction of interstitial Ca incorporation and organic vanadate surface protection. It is revealed that regulating Ca occupation in the body phase at a relatively low concentration can effectively expand the layer distance of α-V2O5, which facilitates the intercalation access for Li-ion insertion. On the other hand, organometallics are first applied as the protective layer to stabilize the electrode interface during cycling. The optimized coating layer, vanadium oxy-acetylacetonate (VO(acac)2), plays an important role to generate a more inorganic component (LiF) within the solid electrolyte interface, contributing to the protection of the Ca-incorporated V2O5 electrode. As a result, the optimized Ca0.05V2O5/VO(acac)2 hybrid electrode exhibits much improved capacity utilization, rate capability, and cycling stability, delivering capacity as high as 297 mAh g-1 for full LIBs. The first-principle computations reveal the lattice change caused by the Ca incorporation, further confirming the lattice advantage of Ca0.05V2O5/VO(acac)2 with respect to Li-ion intercalation.
AB - Vanadium pentoxide (V2O5) offers high capacity and energy density as a cathode candidate for lithium-ion batteries (LIBs). Unfortunately, its practical utilization is intrinsically handicapped by the low conductivity, poor electrode kinetics, and lattice instability. In this study, the synergistical optimization protocol has been proposed in the conjunction of interstitial Ca incorporation and organic vanadate surface protection. It is revealed that regulating Ca occupation in the body phase at a relatively low concentration can effectively expand the layer distance of α-V2O5, which facilitates the intercalation access for Li-ion insertion. On the other hand, organometallics are first applied as the protective layer to stabilize the electrode interface during cycling. The optimized coating layer, vanadium oxy-acetylacetonate (VO(acac)2), plays an important role to generate a more inorganic component (LiF) within the solid electrolyte interface, contributing to the protection of the Ca-incorporated V2O5 electrode. As a result, the optimized Ca0.05V2O5/VO(acac)2 hybrid electrode exhibits much improved capacity utilization, rate capability, and cycling stability, delivering capacity as high as 297 mAh g-1 for full LIBs. The first-principle computations reveal the lattice change caused by the Ca incorporation, further confirming the lattice advantage of Ca0.05V2O5/VO(acac)2 with respect to Li-ion intercalation.
KW - cathode material
KW - lithium-ion batteries
KW - metal incorporation
KW - organic vanadate
KW - vanadium pentoxide
UR - http://www.scopus.com/inward/record.url?scp=85068144075&partnerID=8YFLogxK
U2 - 10.1021/acsami.9b08236
DO - 10.1021/acsami.9b08236
M3 - Article
C2 - 31180199
AN - SCOPUS:85068144075
SN - 1944-8244
VL - 11
SP - 23291
EP - 23302
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 26
ER -
