Best practices for photo-assisted batteries: decoupling Heat and Light Arvind Pujari 1 , Byungman Kim 1 , Farheen Syed 3 , Wesley Dose 4 , Neil Greenham 1 , Michael De Volder 2 1 Cavendish Laboratory, University of Cambridge, UK, 2 Institute for Manufacturing, University of Cambridge, UK, 3 Department of Chemistry, University of Cambridge, UK, 4 Department of Chemistry, University of New South Wales, Australia The interaction of light with batteries has gained increased traction for integrated electrochemical energy storage and photo-rechargeable batteries 1 . Several reports have underlined an increased charging rate and the 'photo charging' effect when commercial battery systems are exposed to light 2,3 . In this study we test the effects of light on the photoassisted charging of two semiconductor cathode materials: LiMn 2 O 4 (powder and thin films) and V 2 O 5 under 1 sun illumination in aqueous zinc ion batteries. A cell design is provided to allow for effective cooling of the electrolyte within the cell under conditions of sustained illumination. Our results show that most papers underestimate the thermal contribution of light to the enhanced capacities in these systems upon illumination and effective thermal controls are required to report such results accurately. References 1. Liu, Hongmin, et al. "A Photo-rechargeable Aqueous Zinc–Tellurium Battery Enabled by the Janus-Jointed Perovskite/Te Photocathode."ACS nano(2023). 2. Lipton, Jason, et al. "Correlating wavelength dependence in LiMn2O4 cathode photo-accelerated fast charging with deformations in local structure."Cell Reports Physical Science3.9 (2022): 101051. 3. Boruah, Buddha Deka, et al. "Photo-rechargeable zinc-ion batteries."Energy & Environmental Science13.8 (2020): 2414- 2421.
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