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Advanced Zinc–Iodine Batteries with Ultrahigh Capacity and Superior Rate Performance Based on Reduced Graphene Oxide and Water-in-Salt Electrolyte
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-01-15 , DOI: 10.1002/adfm.202210043 Yu Ji 1 , Junpeng Xie 1, 2 , Zhaoxi Shen 1 , Yu Liu 1 , Zhaorui Wen 1 , Lei Luo 1 , Guo Hong 2
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-01-15 , DOI: 10.1002/adfm.202210043 Yu Ji 1 , Junpeng Xie 1, 2 , Zhaoxi Shen 1 , Yu Liu 1 , Zhaorui Wen 1 , Lei Luo 1 , Guo Hong 2
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Aqueous rechargeable zinc–iodine batteries have received increasing attention in the field of portable electronics due to their high safety, low-cost, and great electrochemical performance. However, the insulated nature of iodine and the unrestricted shuttle effect of soluble triiodide seriously limit the lifespan and Coulombic efficiency (CE) of the batteries. Herein, a high-performance zinc–iodine energy storage system based on the hydrothermal reduced graphene oxide (rGO) and a high concentration zinc chloride water-in-salt electrolyte are promoted. The 3D microporous structures and outstanding electrical conductivity of rGO make it an excellent host for iodine, while the water-in-salt electrolyte effectively suppresses the shuttle effect of triiodide and improves the CE of the system. As a result, an ultra-high I2 mass loading of 25.33 mg cm−2 (loading ratio of 71.69 wt.%) is realized during the continuous charging/discharging process. The batteries deliver a high capacity of 6.5 mAh cm−2 at 2 mA cm−2 with a much-improved CE of 95% and a prominent rate performance with capacity of 1 mAh cm−2 at 80 mA cm−2. A stable long-term cycling performance is also achieved with capacity retention of 2 mAh cm−2 after 2000 cycles at 50 mA cm−2.
中文翻译：
基于还原氧化石墨烯和盐包水电解质的具有超高容量和优异倍率性能的先进锌碘电池
水系可充电锌碘电池由于其高安全性、低成本和良好的电化学性能而在便携式电子领域受到越来越多的关注。然而，碘的绝缘性和可溶性三碘化物不受限制的穿梭效应严重限制了电池的寿命和库仑效率 (CE)。在此，推广基于水热还原氧化石墨烯（rGO）和高浓度氯化锌盐包水电解质的高性能锌碘储能系统。rGO的三维微孔结构和出色的导电性使其成为碘的优良主体，而盐包水电解质有效抑制了三碘化物的穿梭效应，提高了体系的CE。因此，超高 I 2在连续充放电过程中实现了25.33 mg cm -2的质量负载（负载率为71.69 wt.%）。该电池在 2 mA cm -2时提供 6.5 mAh cm -2的高容量，CE 大大提高为 95%，并且在 80 mA cm -2时容量为 1 mAh cm -2。在 50 mA cm -2下循环 2000 次后，还实现了稳定的长期循环性能，容量保持为 2 mAh cm -2。
更新日期：2023-01-15
中文翻译：
基于还原氧化石墨烯和盐包水电解质的具有超高容量和优异倍率性能的先进锌碘电池
水系可充电锌碘电池由于其高安全性、低成本和良好的电化学性能而在便携式电子领域受到越来越多的关注。然而，碘的绝缘性和可溶性三碘化物不受限制的穿梭效应严重限制了电池的寿命和库仑效率 (CE)。在此，推广基于水热还原氧化石墨烯（rGO）和高浓度氯化锌盐包水电解质的高性能锌碘储能系统。rGO的三维微孔结构和出色的导电性使其成为碘的优良主体，而盐包水电解质有效抑制了三碘化物的穿梭效应，提高了体系的CE。因此，超高 I 2在连续充放电过程中实现了25.33 mg cm -2的质量负载（负载率为71.69 wt.%）。该电池在 2 mA cm -2时提供 6.5 mAh cm -2的高容量，CE 大大提高为 95%，并且在 80 mA cm -2时容量为 1 mAh cm -2。在 50 mA cm -2下循环 2000 次后，还实现了稳定的长期循环性能，容量保持为 2 mAh cm -2。
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