An advanced Ni–Graphite molten salt battery with 95 °C operating temperature for energy storage application
An advanced Ni–Graphite molten salt battery with 95 °C operating temperature for energy storage application
复制标题
DOI：
10.1016/j.cej.2022.135110
复制
发表时间：
2022-02
影响因子：
15.1
通讯作者：
Wenlong Zhang;C. Liao;Xiaohui Ning
中科院分区：
文献类型：
--
作者：
Wenlong Zhang;C. Liao;Xiaohui Ning
基于高安全性和低成本，熔盐电池（Na-S电池、液态金属电池、ZEBRA电池等）作为大规模的电存储技术受到越来越多的关注。然而，熔盐电池的高工作温度仍然是阻碍其实际应用的障碍之一。基于Ni/NiCl 2氧化还原的电化学可逆性和氯铝酸阴离子在石墨中的嵌入/脱嵌反应，提出了一种新型的Ni-石墨熔盐电池。采用廉价的四元无机熔盐AlCl_3/KCl/NaCl/LiCl作为电解质，所设计的镍-石墨电池具有95 °C的低温工作温度和1.7V的平均电压。在500 mA/g电流密度下，石墨镍电池循环120次，比容量稳定在174 mAh/g，容量留存率为98%。此外，镍-石墨电池还显示出约113.6 $/kWh的低材料成本和289 Wh/kg的高电极能量密度。这项工作开发了一种具有低工作温度和高能量密度的先进熔盐电池，并为开发基于熔盐电池的未来大型储能设备提供了一种替代手段。
Based on the high safety and low costs, molten salt batteries (Na-S battery, liquid metal battery, ZEBRA battery, etc.) have received more and more attention as large-scale electrical storage technology. However, the high operating temperature of molten salt batteries is still one of the roadblocks that impeded their practical application. Here we present the novel Ni-graphite molten salt battery based on outstanding electrochemical reversibility of the Ni/NiCl2redox and intercalation/de-intercalation chemistry of chloroaluminate anions in graphite. By using the low-cost, quaternary inorganic molten salt AlCl3/KCl/NaCl/LiCl as electrolyte, the as-designed Ni-graphite battery possesses low operating temperature of 95 °C, and average voltage about 1.7 V. The Ni-graphite battery delivers stable specific capacity of 174 mAh/g at 500 mA/g after 120 cycles, with the capacity retention rate of 98%. In addition, the Ni-graphite battery also shows low material costs about 113.6 $/kWh and high electrode energy density of 289 Wh/kg. This work develops an advanced molten salt battery with low operating temperature and high energy density, as well as provides an alternative means of developing future large-scale power storage equipment based on molten salt batteries.