Safe and Durable High-Temperature Lithium-Sulfur Batteries via Molecular Layer Deposited Coating
Safe and Durable High-Temperature Lithium-Sulfur Batteries via Molecular Layer Deposited Coating
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DOI：
10.1021/acs.nanolett.6b00577
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发表时间：
2016-06-01
期刊：
影响因子：
10.8
通讯作者：
Sun, Xueliang
中科院分区：
文献类型：
--
作者：
Li, Xia;Lushington, Andrew;Sun, Xueliang
锂硫（Li-S）电池是一种很有前途的电动汽车高能量存储材料。然而，通常采用的基于醚的电解质由于低的沸点和闪蒸温度而不能实现安全的高温Li-S电池。传统的碳酸盐基电解质在高温下具有安全的物理性能，但对于大多数Li-S电池来说，不能完成可逆的电化学反应。在这里，我们实现了安全的高温锂硫电池上的通用碳硫电极的分子层沉积（MLD）铝涂层。具有MLD涂层的硫阴极在碳酸盐电解液中完成可逆的电化学过程，并在高温下表现出安全和超稳定的循环寿命，这为电动汽车和其他大规模储能系统提供了实用的Li-S电池。
Lithium-sulfur (Li-S) battery is a promising high energy storage candidate in electric vehicles. However, the commonly employed ether based electrolyte does not enable to realize safe high-temperature Li-S batteries due to the low boiling and flash temperatures. Traditional carbonate based electrolyte obtains safe physical properties at high temperature but does not complete reversible electrochemical reaction for most Li-S batteries. Here we realize safe high temperature Li-S batteries on universal carbon-sulfur electrodes by molecular layer deposited (MLD) alucone coating. Sulfur cathodes with MLD coating complete the reversible electrochemical process in carbonate electrolyte and exhibit a safe and ultrastable cycle life at high temperature, which promise practicable Li-S batteries for electric vehicles and other large-scale energy storage systems.