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Tailored Electrolytes Enabling Practical Lithium–Sulfur Full Batteries via Interfacial Protection
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-07-07 , DOI: 10.1021/acsenergylett.1c01091
Zeyu Shen 1, 2 , Weidong Zhang 1, 2 , Shulan Mao 1, 2 , Siyuan Li 1, 2 , Xinyang Wang 1, 2 , Yingying Lu 1, 2
Affiliation  

The electroactivity of the sulfur composite cathode generally studied requires high electrode porosity, which brings many constraints to the design of lithium–sulfur (Li–S) batteries (e.g., electrolyte quantity and energy density). Here, we focus on electrolyte engineering for highly stable covalent-type sulfurized polyacrylonitrile (SPAN) to realize practical Li–S full batteries with jointly improved volumetric energy density (Ev) and cyclability. The conformal polycarbonate cathode-electrolyte interphase (CEI) derived by cyclic carbonate is determined to play a fundamental role in eliminating the fatal shuttle effect, thereby safeguarding the “solid-phase” mechanism of SPAN. The tailored electrolyte also induces a bilayered solid electrolyte interphase (SEI) with enhanced Li+ transport and mechanical strength, which unlocks the compatibility of an ultrathin Li anode. Practical Li-SPAN pouch cells, composed of high-capacity SPAN cathodes (4.08 mAh cm–2) and 1.2× excess Li anodes, can achieve an Ev of 615 Wh L–1 and show a cycle life at least 7 times that of the conventional carbonate-based electrolyte.

中文翻译:

量身定制的电解质通过界面保护实现实用的锂硫全电池

硫复合正极的电活性通常需要高电极孔隙率,这给锂硫(Li-S)电池的设计带来了许多限制(例如,电解质数量和能量密度)。在这里,我们专注于高度稳定的共价型硫化聚丙烯腈 (SPAN) 的电解质工程,以实现具有共同提高的体积能量密度 ( E v ) 和循环性能的实用 Li-S 全电池。由环状碳酸酯衍生的共形聚碳酸酯阴极 - 电解质中间相(CEI)被确定在消除致命穿梭效应方面发挥根本作用,从而保护 SPAN 的“固相”机制。定制的电解质还诱导了双层固体电解质界面 (SEI),具有增强的 Li +传输和机械强度,这解锁了超薄锂负极的兼容性。实用的 Li-SPAN 软包电池,由高容量 SPAN 正极(4.08 mAh cm –2)和 1.2 倍过量锂负极组成,可实现615 Wh L –1E v并显示至少 7 倍的循环寿命传统的碳酸盐基电解质。
更新日期:2021-08-13
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