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Design strategy for integrated photo-rechargeable batteries with high energy density
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DOI：10.1016/j.ensm.2026.105417.png)
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Abstract
En 中文
The adoption of autonomous smart devices necessitates new solutions for energy harvesting and storage to power them. Photo-rechargeable batteries, which integrate these functions into a single device, have gained traction as compact and cost-efficient solution for such applications. However, the implications of different system designs and material choices on photo-battery performance remain poorly understood. Here, we first compare the battery performance of solid Li-ion battery cathode materials (e.g. LiFePO4 and LiNi0.8Co0.1Mn0.1O2) with liquid catholytes (e.g. polyiodide and Cu2+/+(dmby)2) for photo-battery applications. The results indicate that the closely packed nature of solid-phase active materials allow for higher volumetric energy density and rate performance. Building on these findings, we present a device architecture for an integrated photo-rechargeable lithium metal battery incorporating a LiFePO4 cathode and a dye-sensitized PV-electrode. These compact photo-batteries can self-charge to 70% state of charge within 10 min under 1-sun illumination and also operate under indoor light. Through simultaneous photo-charging and discharging, we demonstrate that the battery output can be significantly enhanced solely by light energy, offering a clear strategy for future photo-battery design.
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