Reinvigorating Reverse‐Osmosis Membrane Technology to Stabilize the V₂O₅Lithium‐Ion Battery Cathode

Abstract

V 2 O 5 is deemed as one of the most promising cathode materials for next-generation high-capacity lithium-ion batteries (LIBs). It possesses a theoretical capacity of 294 mAh g À1 , which is much higher than conventional cathodes. However, there are many issues to be solved before its practical use, including poor cycle life and unsatisfactory rate performance, mainly owing to its low electronic conductivity and ionic diffusivity, as well as structural instability. This work reports three types of V 2 O 5 asymmetric membranes synthesized by using an adapted reverse-osmosis membrane technology combined with sol-gel chemistry, aiming to stabilize the cyclability and improve the rate performance. V 2 O 5 asymmetric membrane cathodes prepared using graphene as the conductive additives have a specific capacity of approximately 160 mAh g À1 at a current density of 100 mA g À1 with no capacity degradation after 380 cycles. It is also found that the annealing temperature and the choice of conductive additives can affect the morphology of V 2 O 5 nanoparticles and the overall electrode cyclability. A lower annealing temperature (300 vs. 400 8C) and addition of graphene are beneficial to long-term cycling performance.[a] Dr.

Building a Better Li‐Garnet Solid Electrolyte/Metallic Li Interface with Antimony

“…During a discharge step, i.e., a lithiation of the cathode, three distinct plateaus at approximately 3.3, 3.1 and 2.3 V versus Li + /Li were observed at all current densities, indicating a 3-step lithiation mechanism. As previously reported, [41] the first and second plateaus are attributed to the formation of Li 0.5 V 2 O 5 and LiV 2 O 5 , respectively. The third plateau corresponds to the phase transition from LiV 2 O 5 to Li 2 V 2 O 5 .…”

Antimony nanobelt asymmetric membranes for sodium ion battery

“…Quite a few strategies have been proposed to accommodate the large volume change of antimony-based alloy anodes, most of which focus on nano-structuring, compositing, alloying, as well as developing new binders and electrolyte additives [10,[13][14][15]. Recently, asymmetric membrane structure has been adopted by our laboratory for the first time to alleviate the severe volume expansion of highcapacity anodes in LIBs, such as Si, Ge and Sn nano/micron particles [16][17][18][19][20][21]. In this study, antimony nanobelts embedded in carbonaceous asymmetric membranes are synthesized, characterized and employed as the alloy anode material for high capacity/performance SIBs.…”

Recent progress in rate and cycling performance modifications of vanadium oxides cathode for lithium-ion batteries

“…Besides, the structures stacked by various [VO] polyhedrons provide a large number of channels for lithium-ion transport [25,26]. For example, V 2 O 5 with a typical layered structure possess a considerable theoretical capacity (~294 mAh/g) [27], Li x V 2 O 5 (0 < x < 1) is formed after the insertion of lithium-ion between the layers, which is completely reversible, so the high output voltage of V 2 O 5 is ensured [28].…”