电解质
材料科学
阳极
剥离(纤维)
电镀(地质)
易燃液体
化学工程
图层(电子)
枝晶(数学)
金属
钠
无机化学
电极
纳米技术
复合材料
冶金
化学
有机化学
物理化学
几何学
工程类
地质学
数学
地球物理学
作者
Ming Zhu,Lulu Li,Yuanjun Zhang,Kuan Wu,Fangfang Yu,Zhongyi Huang,Guanyao Wang,Jiye Li,Liaoyong Wen,Huan Liu,Shi Xue Dou,Yan Yu,Chao Wu
标识
DOI:10.1016/j.ensm.2021.07.012
摘要
Sodium metal batteries (SMBs) have huge potential for applications in large-scale energy storage systems because of their high energy density, low cost and abundant resources. However, SMBs suffer from challenging problems, such as low reversibility and dendrite growth during plating/stripping. In this work, we report that a non-flammable electrolyte with Fluoroethylene carbonate (FEC) and 1,3,2-Dioxathiolane 2,2-dioxide (DTD) can in-situ generate a stable solid-electrolyte-interface (SEI) layer, which effectively suppresses the side reactions and prevents dendrite growth. This is attributed to the synergy of the multi-component of SEI layer including S-containing compounds (Na2S, Na2SO3 and organic S-containing salts), NaF and phosphate (Na3PO4). The DTD additive significantly promotes the stability and integrity of the formed SEI layer, which not only enables the dendrite-free Na plating/stripping with an average CE as high as 93.4% for 250 cycles, but also makes the Na||Na symmetric cell stable over more than 1350 h at 1 mAh cm−2 and 720 h even at 5 mAh cm−2.
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