A β”-Alumina/Inorganic Ionic Liquid Dual Electrolyte for Intermediate-Temperature Sodium-Sulfur Batteries
A β”-Alumina/Inorganic Ionic Liquid Dual Electrolyte for Intermediate-Temperature Sodium-Sulfur Batteries
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中温钠硫电池用β”-氧化铝/无机离子液体双电解质
DOI：
10.1002/adfm.202105524
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发表时间：
2021
影响因子：
19
通讯作者：
Rika Hagiwara
中科院分区：
文献类型：
--
作者：
Di Wang;Jinkwang Hwang;Chi-yao Chen;Keigo Kubota;Kazuhiko Matsumoto;Rika Hagiwara
虽然钠硫（Na-S）电池具有高能量密度、长循环性和可持续性的巨大前景，但其部署受到安全性、实用性和多功能性问题的严重阻碍，这些问题是由其高于300 °C的高工作温度引起的。降低操作温度会阻碍Na-S电池的性能，这是由于绝缘S/多硫化物的形成、β"-氧化铝固体电解质（BASE）中Na离子传导的减少、Na金属枝晶在低于其熔点的温度下生长以及在没有BASE的情况下发生的穿梭效应。在本文中，提出了一种Na-S电池，其集成了由BASE和新型无机离子液体组成的双电解质，用于150 °C的中温操作。研究表明，离子液体具有高离子电导率，宽电化学窗口，以及优异的热稳定性和化学稳定性，使其有利于中温操作。在0.1 mA（电极面积：0.785 cm 2）下795 mAh（g-S）− 1的高可逆容量和在0.5 mA下超过1000次循环后达到的381 mAh（g-S）− 1的平均容量验证了在双电解质系统中使用离子液体以改善Na-S性能。
Although sodium–sulfur (Na–S) batteries present the great prospects of high energy density, long cyclability, and sustainability, their deployment is heavily encumbered by safety, practicality, and versatility issues engendered by their high operating temperatures above 300 °C. Lowering the operating temperatures impedes the performance of Na–S batteries due to the formation of insulating S/polysulfides, diminished Na ion conduction in the β”‐alumina solid electrolyte (BASE), the Na metal dendrite growth at temperatures below its melting point, and the shuttle effect occurring in the absence of the BASE. Herein, a Na–S battery that integrates a dual electrolyte consisting of the BASE and a novel inorganic ionic liquid is proposed for intermediate‐temperature operations of 150 °C. Investigations reveal the ionic liquid to have high ionic conductivity, wide electrochemical window, and excellent thermal and chemical stability, making it propitious for intermediate‐temperature operations. The high reversible capacity of 795 mAh (g‐S)−1at 0.1 mA (electrode area: 0.785 cm2) and an average capacity of 381 mAh (g‐S)−1achieved over 1000 cycles at 0.5 mA validate the use of ionic liquids in dual electrolyte systems to improve Na–S performance.