法拉第效率
阴极
阳极
材料科学
电化学
溶解
水溶液
枝晶(数学)
化学工程
锌
电流密度
冶金
电极
化学
有机化学
几何学
数学
物理
物理化学
量子力学
工程类
作者
Shaojian Zhang,Junnan Hao,Han Wu,Qianru Chen,Chao Ye,Shi Zhang Qiao
标识
DOI:10.1002/adma.202404011
摘要
Abstract Aqueous zinc–iodine (Zn–I 2 ) batteries hold potential for large‐scale energy storage but struggle with shuttle effects of I 2 cathodes and poor reversibility of Zn anodes. Here, an interfacial gelation strategy is proposed to suppress the shuttle effects and improve the Zn reversibility simultaneously by introducing silk protein (SP) additive. The SP can migrate bidirectionally toward cathode and anode interfaces driven by the periodically switched electric field direction during charging/discharging. For I 2 cathodes, the interaction between SP and polyiodides forms gelatinous precipitate to avoid the polyiodide dissolution, evidenced by excellent electrochemical performance, including high specific capacity and Coulombic efficiency (CE) (215 mAh g −1 and 99.5% at 1 C), excellent rate performance (≈170 mAh g −1 at 50 C), and extended durability (6000 cycles at 10 C). For Zn anodes, gelatinous SP serves as protective layer to boost the Zn reversibility (99.7% average CE at 2 mA cm −2 ) and suppress dendrites. Consequently, a 500 mAh Zn–I 2 pouch cell with high‐loading cathode (37.5 mg iodine cm −2 ) and high‐utilization Zn anode (20%) achieves remarkable energy density (80 Wh kg −1 ) and long‐term durability (>1000 cycles). These findings underscore the simultaneous modulation of both cathode and anode and demonstrate the potential for practical applications of Zn–I 2 batteries.
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