AI Article Synopsis
- Photo-assisted ion batteries use light to increase their energy capacity, but they struggle with stability during charging and discharging due to complicated processes involving charge and ion transfer when illuminated.
- This research highlights the role of photo-induced proton transfer (PT) as a key factor in the performance of VO-based zinc-ion batteries, which boosts capacity during light exposure but risks damage over time.
- By utilizing an anode-alloying strategy to allow reversible use of protons from photo-induced PT, the study achieved a 54% increase in capacity and maintained about 90% capacity retention over 4000 cycles, greatly improving the battery's long-term stability.
Article Abstract
Photo-assisted ion batteries utilize light to boost capacity but face cycling instability due to complex charge/ion transfer under illumination. This study identified photo-induced proton transfer (photo-induced PT) as a significant process in photo-(dis)charging of widely-used VO-based zinc-ion batteries, contributing to enhanced capacity under illumination but jeopardizing photo-stability. Photo-induced PT occurs at 100 ps after photo-excitation, inducing rapid proton extraction into VO photoelectrode. This process creates a proton-deficient microenvironment on surface, leading to repetitive cathode dissolution and anode corrosion in each cycle. Enabling the intercalated protons from photo-induced PT to be reversibly employed in charge-discharge processes via the anode-alloying strategy achieves high photo-stability for the battery. Consequently, a ~54 % capacity enhancement was achieved in a VO-based zinc-ion battery under illumination, with ~90 % capacity retention after 4000 cycles. This extends the photo-stability record by 10 times. This study offers promising advancements in energy storage by addressing instability issues in photo-assisted ion batteries.
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| http://dx.doi.org/10.1002/anie.202400621 | DOI Listing |
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