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Reinvigorating Reverse‐Osmosis Membrane Technology to Stabilize the V 2 O 5 Lithium‐Ion Battery Cathode
Author(s) -
Wu Ji,
Byrd Ian,
Jin Congrui,
Li Jianlin,
Chen Hao,
Camp Tyler,
Bujol Ryan,
Sharma Anju,
Zhang Hanlei
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700102
Subject(s) - materials science , cathode , chemical engineering , annealing (glass) , graphene , membrane , ionic conductivity , lithium ion battery , ion , battery (electricity) , nanotechnology , electrode , composite material , chemistry , electrolyte , thermodynamics , organic chemistry , biochemistry , power (physics) , physics , engineering
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 −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 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 −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 V 2 O 5 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.