Reversible Cl 2 /Cl – Redox for Low-Temperature Aqueous Batteries
Reversible Cl 2 /Cl – Redox for Low-Temperature Aqueous Batteries
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用于低温水系电池的可逆 Cl 2 /Cl → 氧化还原
DOI：
10.1021/acsenergylett.2c02757
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发表时间：
2023
影响因子：
22
通讯作者：
Ji, Xiulei
中科院分区：
文献类型：
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作者：
Sui, Yiming;Lei, Ming;Yu, Mingliang;Scida, Alexis;Sandstrom, Sean K.;Stickle, William;O’Larey, Timothy D.;Jiang, De-en;Ji, Xiulei
传统的阴极通常将电荷存储在固体中，并且由于离子传输的能量障碍，它们通常在低温下性能受损。本文报道了cl2液体在纳米孔碳内的可逆“镀”反应，作为低温水电池的新电极。在7mLiCl的水电解质中，活性炭电极在- 78°C下，在100 mA/g下，放电平台在约0.95 V vs Ag/AgCl下，提供475 mAh/g的高放电容量（基于工作电极中的碳活性质量），并在1 a /g的高电流下保持238 mAh/g的高容量。此外，该电极系统表现出稳定的循环，在500 mA/g下循环100次后，容量保持率约为65%，平均库仑效率高于99%。研究结果为低温高能卤素阴极提供了一种新的选择。
Conventional cathodes generally store charges inside solids, and they usually suffer from compromised performance at low temperatures due to the energy barriers for ion transport. Here we report a reversible “plating” reaction of Cl2liquid inside nanoporous carbon as a new electrode for low-temperature aqueous batteries. In a 7mLiCl aqueous electrolyte, the activated carbon electrode delivers a high discharge capacity of 475 mAh/g (based on the carbon active mass in the working electrode) at 100 mA/g at −78 °C with a discharging plateau at ca. 0.95 V vs Ag/AgCl and retains a high capacity of 238 mAh/g at a high current rate of 1 A/g. Furthermore, this electrode system demonstrates stable cycling with ca. 65% capacity retention after 100 cycles at 500 mA/g with an average Coulombic efficiency of above 99%. The results provide a new option for high-energy halogen cathodes at low temperatures.