Cu₃V₂O₈ Nanoparticles as Intercalation‐Type Anode Material for Lithium‐Ion Batteries

Abstract

Cu3 V2 O8 nanoparticles with particle sizes of 40-50 nm have been prepared by the co-precipitation method. The Cu3 V2 O8 electrode delivers a discharge capacity of 462 mA h g(-1) for the first 10 cycles and then the specific capacity, surprisingly, increases to 773 mA h g(-1) after 50 cycles, possibly as a result of extra lithium interfacial storage through the reversible formation/decomposition of a solid electrolyte interface (SEI) film. In addition, the electrode shows good rate capability with discharge capacities of 218 mA h g(-1) under current densities of 1000 mA g(-1) . Moreover, the lithium storage mechanism for Cu3 V2 O8 nanoparticles is explained on the basis of ex situ X-ray diffraction data and high-resolution transmission electron microscopy analyses at different charge/discharge depths. It was evidenced that Cu3 V2 O8 decomposes into copper metal and Li3 VO4 on being initially discharged to 0.01 V, and the Li3 VO4 is then likely to act as the host for lithium ions in subsequent cycles by means of the intercalation mechanism. Such an "in situ" compositing phenomenon during the electrochemical processes is novel and provides a very useful insight into the design of new anode materials for application in lithium-ion batteries.

Phase Separation Derived Core/Shell Structured Cu11 V6 O26 /V2 O5 Microspheres: First Synthesis and Excellent Lithium-Ion Anode Performance with Outstanding Capacity Self-Restoration

“…Xiong and co‐workers fabricated hollow hexagonal prismatic pencils of Co 3 V 2 O 8 ·nH 2 O and hexagonal microplatelets of Co 2 V 2 O 7 via a hydrothermal method and water bath method respectively, showing highly reversible capacity and better cycling performances . As one of important MVOs, copper vanadium oxides show great potential for application in the fields of high‐energy lithium batteries and electrochemical sensors . Owing to rich layered structures, excellent kinetics, cheapness, and more environmental friendliness, copper vanadium oxides have been successfully used as cathodes in primary and secondary LIBs, while no attempts have been made so far to study their potential use as LIBs anodes.…”

Hierarchical Ultrafine Ni3V2O8 Nanoparticles Anchored on rGO as High‐Performance Anode Materials for Lithium‐Ion Batteries

“…Remarkably, high initial discharge and charge capacities can be reached at 1250 and 803 mAh g –1 , respectively. An irreversible capacity retention of 35% mainly originates from the irreversible processes on the surface of electrodes, including the formation of solid electrolyte interface (SEI) layer, the decomposition of electrolyte, and partial incomplete conversion reaction [7a,15]. The second charge/discharge curves (in Figure c) have a couple of obvious charging and discharging platforms at the voltages of 2.3 and 1.6 V, respectively, which is quite different from the following curves.…”

“…In the first 200 cycles at a current density of 500 mA g –1 , the discharge capacity of rGO@Ni 3 V 2 O 8 NPs has a slight decline in the first several cycles and then gradually increases to 1150 mA h g –1 at the end of the 200th cycle. This unique phenomenon can be ascribed to the initial phase change and then reactivation induced by high‐rate lithiation, accompanied with the reaction of electrolyte [1a,6,15,23]. When the current density increases to 1000 mA g –1 , a stable capacity of about 900 mA h g –1 is retained for another 200 cycles.…”

Stabilization of LiV3O8 Rod‐like Structure by Protective Mg3(PO4)2Layer for Advanced Lithium Storage Cathodes

“…Benefitting from the protective MP layer, the capacities of as‐prepared samples retained 250, 235, 193 and 177 mAh g −1 after 50 cycles, at corresponding stepwise current densities. The latter was attributed to formation of MP coating layer, as well as inhibition of interface reaction between the cathode and electrolyte by MP coating layer …”