Reinvigorating Reverse Osmosis Membrane Technology for Stabilizing V2O5 Lithium Ion Battery Cathode

Document Type

Article

Publication Date

5-2017

Publication Title

ChemElectroChem

DOI

10.1002/celc.201700102

ISSN

2196-0216

Abstract

V2O5 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−1, 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 V2O5 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. V2O5 asymmetric membrane cathodes prepared using graphene as the conductive additives have a specific capacity of approximately 160 mAh g−1 at a current density of 100 mA g−1 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 V2O5 nanoparticles and the overall electrode cyclability. A lower annealing temperature (300 vs. 400 °C) and addition of graphene are beneficial to long‐term cycling performance.

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