Exfoliated 2D Lepidocrocite Titanium Oxide Nanosheets for High Sulfur Content Cathodes with Highly Stable Li–S Battery Performance,ACS Energy Letters

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Exfoliated 2D Lepidocrocite Titanium Oxide Nanosheets for High Sulfur Content Cathodes with Highly Stable Li–S Battery Performance
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-01-23 00:00:00 , DOI: 10.1021/acsenergylett.7b01202
Sharad B. Patil ₁ , Hyeon Jin Kim ₂ , Hyung-Kyu Lim _{2,

3} , Seung Mi Oh ₁ , Jiheon Kim ₂ , Jaeho Shin ₄ , Hyungjun Kim _{2,

3} , Jang Wook Choi ₄ , Seong-Ju Hwang ₁

Affiliation

Despite the high energy densities, lithium–sulfur (Li–S) batteries suffer from insufficient cycle life originating from the shuttling process involving lithium polysulfides (LiPSs). Various approaches have been introduced to resolve the shuttling problem, but they are not usually effective for electrodes with high sulfur contents. Here, we report an exfoliated 2D lepidocrocite titanium oxide nanosheet as a component for sulfur cathodes to suppress polysulfide dissolution markedly. In particular, the Lewis acidity originating from undercoordinated Ti species as well as the large surface area associated with the 2D structure endow 2D lepidocrocite titanium oxide with an efficient interaction with LiPSs. As a result, even with a sulfur content of 80 wt %, the Li–S cell exhibits 1023.5 mAh g^–1 at 50 mA g^–1 and a capacity retention of 82.3% after 300 cycles measured at 1000 mA g^–1. The considerably improved cycling performance provides useful insight for designing sulfur cathodes, that is, the incorporation of acidic 2D metal oxide nanosheets.

中文翻译：

具有高稳定性Li–S电池性能的高硫含量阴极剥落的2D纤铁矿二氧化钛纳米片

尽管能量密度高，但锂硫（Li–S）电池的循环寿命不足，这是由于涉及多硫化锂（LiPSs）的穿梭过程引起的。已经引入了各种方法来解决穿梭问题，但是它们通常对于高硫含量的电极无效。在这里，我们报告剥落的2D纤铁矿二氧化钛纳米片作为硫阴极的成分，可显着抑制多硫化物的溶解。特别是，路易斯酸度源自配位不足的Ti物种以及与2D结构相关的大表面积，从而赋予了2D纤铁矿二氧化钛与LiPSs有效的相互作用。结果，即使硫含量为80 wt％，Li–S电池在50 mA g时仍显示1023.5 mAh g ^–1^–1，在1000 mA g ^–1下测量300个循环后的容量保持率为82.3％。循环性能的显着改善为设计硫阴极提供了有用的见识，即结合了酸性2D金属氧化物纳米片。

更新日期：2018-01-23

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