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A Low Cost Aqueous Zn–S Battery Realizing Ultrahigh Energy Density
Advanced Science ( IF 14.3 ) Pub Date : 2020-10-20 , DOI: 10.1002/advs.202000761 Wei Li 1 , Kangli Wang 1 , Kai Jiang 1
Advanced Science ( IF 14.3 ) Pub Date : 2020-10-20 , DOI: 10.1002/advs.202000761 Wei Li 1 , Kangli Wang 1 , Kai Jiang 1
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Rechargeable aqueous zinc ion batteries are enabled by the (de)intercalation chemistry, but bottlenecked by the limited energy density due to the low capacity of cathodes. In this work, carbon nanotubes supported 50 wt% sulfur (denoted as S@CNTs‐50), as a conversional cathode, is employed and a high energy density aqueous zinc–sulfur (Zn–S) battery is constructed . In the electrolyte of 1 m Zn(CH3COO)2 (pH = 6.5) with 0.05 wt% I2 additive where I2 can serve as medium of Zn2+ ions to reduce the voltage hysteresis of S@CNTs‐50 and stabilize Zn stripping/plating, S@CNTs‐50 delivers a high capacity of 1105 mAh g−1 with a flat discharge voltage of 0.5 V, realizing an energy density of 502 Wh kg−1 based on sulfur, which is one of the highest values reported in aqueous Zn‐based batteries that use mild electrolyte. Moreover, the chemical materials cost of this aqueous Zn–S battery can be lowered to be $45 kWh−1 due to the cheap raw materials, reaching to the level of pumped energy storage. Ex situ X‐ray diffraction, Raman spectra, X‐ray photoelectron spectrum, and transmission electron microscopy measurements reveal that sulfur cathode undergoes a conversion reaction between S and ZnS.
中文翻译：
一种实现超高能量密度的低成本水系锌硫电池
可充电水性锌离子电池是通过（脱）插化学实现的，但由于阴极容量低而受到能量密度有限的瓶颈。在这项工作中，采用负载 50 wt% 硫的碳纳米管（表示为 S@CNTs-50）作为转换阴极，构建了高能量密度水系锌硫（Zn-S）电池。在含有0.05 wt% I 2添加剂的1 m Zn(CH 3 COO) 2 (pH = 6.5)电解液中，其中I 2可以作为Zn 2+离子的介质，以降低S@CNTs-50的电压滞后并稳定锌剥离/镀层，S@CNTs-50可提供1105 mAh g -1的高容量和0.5 V的平坦放电电压，实现基于硫的502 Wh kg -1能量密度，这是最高值之一据报道，使用温和电解质的水性锌基电池。此外，由于原材料便宜，这种水系Zn-S电池的化学材料成本可降低至45 kWh -1美元，达到泵浦储能的水平。非原位X射线衍射、拉曼光谱、X射线光电子能谱和透射电子显微镜测量表明，硫阴极发生了S和ZnS之间的转化反应。
更新日期：2020-12-03
中文翻译：
一种实现超高能量密度的低成本水系锌硫电池
可充电水性锌离子电池是通过（脱）插化学实现的，但由于阴极容量低而受到能量密度有限的瓶颈。在这项工作中，采用负载 50 wt% 硫的碳纳米管（表示为 S@CNTs-50）作为转换阴极，构建了高能量密度水系锌硫（Zn-S）电池。在含有0.05 wt% I 2添加剂的1 m Zn(CH 3 COO) 2 (pH = 6.5)电解液中，其中I 2可以作为Zn 2+离子的介质，以降低S@CNTs-50的电压滞后并稳定锌剥离/镀层，S@CNTs-50可提供1105 mAh g -1的高容量和0.5 V的平坦放电电压，实现基于硫的502 Wh kg -1能量密度，这是最高值之一据报道，使用温和电解质的水性锌基电池。此外，由于原材料便宜，这种水系Zn-S电池的化学材料成本可降低至45 kWh -1美元，达到泵浦储能的水平。非原位X射线衍射、拉曼光谱、X射线光电子能谱和透射电子显微镜测量表明，硫阴极发生了S和ZnS之间的转化反应。
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