Switching from insertion to conversion for multielectron aqueous vanadium batteries
Source abstract
Abstract
Conventional vanadium chemistries have been hindered by limited capacity inherent to the ion-insertion mechanism and modest redox potentials in near-neutral media, constraining their suitability for high-energy aqueous batteries. Here we demonstrate a conversion-type vanadium redox that delivers concomitant superiority in capacity and potential for aqueous batteries. OH--mediated chemical activation promotes V-O bond cleavage, thereby driving a transition from the single-electron insertion reaction to the four-electron conversion reaction. As confirmed by in situ synchrotron characterizations, a tailored mesoporous architecture enriches local OH-, facilitating the reversible conversion between V2O3 and Na3VO4. The conversion anode delivers a high specific capacity of 700 mAh g-1 with 98% vanadium utilization, a low redox potential of -0.95 V versus standard hydrogen electrode and reversible cycling over 3,000 cycles. An alkaline Ni-V battery is fabricated, with a projected whole-battery-level energy density of up to 110 Wh kg-1. This work paves the way to tuning the reaction pathway and offers insights into multielectron redox design for next-generation aqueous batteries.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced battery technologies research · Electrocatalysts for Energy Conversion · Advancements in Battery Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (55)
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