New Insight into the Working Mechanism of Lithium–Sulfur Batteries under a Wide Temperature Range

doi:10.1021/acsami.1c15975

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	New Insight into the Working Mechanism of Lithium–Sulfur Batteries under a Wide Temperature Range
	Peng, Guiping; Hai, Chunxi; Sun, Chao; Zhou, Yuan; Sun, Yanxia; Shen, Yue; Li, Xiang; Zhang, Guotai; Zeng, Jinbo; Dong, Shengde
	2021-11-24
发表期刊	ACS APPLIED MATERIALS & INTERFACES
ISSN	1944-8244
卷号	13 期号:46 页码:55007-55019
摘要	Sweet potato-derived carbon with a unique solid core/porous layer core/shell structure is used as a conductive substrate for gradually immobilizing sulfur to construct a cathode for Li-S batteries. The first discharge specific capacity of the Li-S batteries with the C-10K@2S composite cathode at 0.1C is around 1645 mAh g(-1), which is very close to the theoretical specific capacity of active sulfur. Especially, after 175 cycles at 0.5C, the maintained specific discharge capacities of the C-10K@2S cathode at -20, 0, 25, and 40 degrees C are about 184.9, 687.2, 795.5, and 758.3 mAh g(-1), respectively, and the cathode is superior to most of the classical carbon form matrices. Working mechanisms of the cathodes under different temperatures are confirmed based on X-ray photoelectron spectroscopy (XPS) and in situ Xray diffraction (XRD) characterizations. Distinctively, during the discharge stage, the widely proposed two-step cathodic reactions occur simultaneously rather than sequentially. In addition, the largely accelerated phase conversion efficiency of the cathode at a higher temperature (from room temperature to 40 degrees C) contributes to its enhanced charge/discharge specific capacity, while the byproduct Li2S2O7 or Li3N irreversibly formed during the cycles limits its application performance at 0 degrees C. These conclusions would be very significant and useful for designing cathodes for Li-S batteries with excellent wide working temperature performance.
DOI	10.1021/acsami.1c15975
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/34583
专题	盐湖资源与化学实验室
推荐引用方式 GB/T 7714	Peng, Guiping,Hai, Chunxi,Sun, Chao,等. New Insight into the Working Mechanism of Lithium–Sulfur Batteries under a Wide Temperature Range[J]. ACS APPLIED MATERIALS & INTERFACES,2021,13(46):55007-55019.
APA	Peng, Guiping.,Hai, Chunxi.,Sun, Chao.,Zhou, Yuan.,Sun, Yanxia.,...&Dong, Shengde.(2021).New Insight into the Working Mechanism of Lithium–Sulfur Batteries under a Wide Temperature Range.ACS APPLIED MATERIALS & INTERFACES,13(46),55007-55019.
MLA	Peng, Guiping,et al."New Insight into the Working Mechanism of Lithium–Sulfur Batteries under a Wide Temperature Range".ACS APPLIED MATERIALS & INTERFACES 13.46(2021):55007-55019.

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