The photo‐responsive capability of lithium battery materials is a prerequisite to realize new‐generation light‐weight photo‐rechargeable batteries. However, the photo‐charging property is not available for common battery electrode materials such as LiFePO₄. In this manuscript, we provide evidence that the halide perovskite material CH₃NH₃PbI₃ is able to activate the photo‐charging properties of the lithium‐ion battery electrode material LiFePO₄. The photoelectrochemical measurement demonstrates that the photo‐responsive property of the CH₃NH₃PbI₃/LiFePO₄ composite is significantly improved; the photo‐induced signals are neither observed in the individual halide perovskite nor the lithium battery material tested under the same condition. The first‐principles calculations reveal strong interactions between the CH₃NH₃PbI₃ layer and the LiFePO₄ layer via the coordination between the Lewis acid and Lewis base species; this forms a heterostructure that assists the photo‐charging process. We propose that the combination of halide perovskite materials and lithium battery electrode materials is a viable way to achieve light‐weight photo‐batteries. Suggestions to address the stability and voltage issues of the halide perovskite‐based hybrid systems toward the photo‐battery application are provided. This study facilitates the fundamental understanding of the integrated photo‐rechargeable battery materials and highlights the importance of halide perovskite materials for the lithium‐ion and photo‐rechargeable batteries.

中文翻译：

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CH3NH3PbI3 / LiFePO4系统的光电性能

锂电池材料的光响应能力是实现新一代轻量级可充电电池的先决条件。但是，对于普通的电池电极材料（如LiFePO _4）而言，光充电特性不可用。在本手稿中，我们提供了证据，表明卤化物钙钛矿材料CH ₃ NH ₃ PbI ₃能够激活锂离子电池电极材料LiFePO ₄的光充电性能。光电化学测量表明，CH ₃ NH ₃ PbI ₃ / LiFePO ₄的光响应特性复合材料明显改善；在相同条件下测试的单个卤化物钙钛矿或测试的锂电池材料均未观察到光诱导信号。第一性原理计算揭示了CH ₃ NH ₃ PbI ₃层与LiFePO ₄之间的强相互作用通过路易斯酸和路易斯碱物种之间的配位形成层；这形成了有助于光充电过程的异质结构。我们建议将卤化钙钛矿材料和锂电池电极材料结合使用是实现轻型光电电池的可行方法。提供了针对光电池应用解决基于卤化钙钛矿的混合系统的稳定性和电压问题的建议。这项研究促进了对集成式可充电电池材料的基本了解，并强调了卤化钙钛矿材料对于锂离子和可充电电池的重要性。