Surface Chemistry in Cobalt Phosphide-Stabilized Lithium-Sulfur Batteries

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	Surface Chemistry in Cobalt Phosphide-Stabilized Lithium-Sulfur Batteries
	Zhong, YR; Yin, LC; He, P; Liu, W; Wu, ZS; Wang, HL; Wang, HL (reprint author), Yale Univ, Dept Chem, 225 Prospect St, New Haven, CT 06520 USA.; Wang, HL (reprint author), Yale Univ, Energy Sci Inst, West Haven, CT 06516 USA.
刊名	JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
	2018-01-31
卷号	140 期号:4 页码:1455-1459
关键词	Hydrogen Evolution Reaction Efficient Electrocatalyst Polysulfide Redox Performance Phosphosulfide Nanoparticles
ISSN号	0002-7863
英文摘要	Chemistry at the cathode/electrolyte interface plays an important role for lithium sulfur batteries in which stable cycling of the sulfur cathode requires confinement of the lithium polysulfide intermediates and their fast electrochemical conversion on the electrode surface. While many materials have been found to be effective for confining polysulfides, the underlying chemical interactions remain poorly understood. We report a new and general lithium polysulfide-binding mechanism enabled by surface oxidation layers of transition-metal phosphide and chalcogenide materials. We for the first time find that CoP nanoparticles strongly adsorb polysulfides because their natural oxidation (forming Co-OP-like species) activates the surface Co sites for binding polysulfides via strong Co-S bonding. With a surface oxidation layer capable of confining polysulfides and an inner core suitable for conducting electrons, the CoP nanoparticles are thus a desirable candidate for stabilizing and improving the performance of sulfur cathodes in lithium sulfur batteries. We demonstrate that sulfur electrodes that hold a high mass loading of 7 mg cm(-2) and a high areal capacity of 5.6 mAh cm(-2) can be stably cycled for 200 cycles. We further reveal that this new surface oxidation-induced polysulfide-binding scheme applies to a series of transition metal phosphide and chalcogenide materials and can explain their stabilizing effects for lithium sulfur batteries.; Chemistry at the cathode/electrolyte interface plays an important role for lithium sulfur batteries in which stable cycling of the sulfur cathode requires confinement of the lithium polysulfide intermediates and their fast electrochemical conversion on the electrode surface. While many materials have been found to be effective for confining polysulfides, the underlying chemical interactions remain poorly understood. We report a new and general lithium polysulfide-binding mechanism enabled by surface oxidation layers of transition-metal phosphide and chalcogenide materials. We for the first time find that CoP nanoparticles strongly adsorb polysulfides because their natural oxidation (forming Co-OP-like species) activates the surface Co sites for binding polysulfides via strong Co-S bonding. With a surface oxidation layer capable of confining polysulfides and an inner core suitable for conducting electrons, the CoP nanoparticles are thus a desirable candidate for stabilizing and improving the performance of sulfur cathodes in lithium sulfur batteries. We demonstrate that sulfur electrodes that hold a high mass loading of 7 mg cm(-2) and a high areal capacity of 5.6 mAh cm(-2) can be stably cycled for 200 cycles. We further reveal that this new surface oxidation-induced polysulfide-binding scheme applies to a series of transition metal phosphide and chalcogenide materials and can explain their stabilizing effects for lithium sulfur batteries.
学科主题	Chemistry, Multidisciplinary
语种	英语
资助机构	Yale University
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79559]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, HL (reprint author), Yale Univ, Dept Chem, 225 Prospect St, New Haven, CT 06520 USA.; Wang, HL (reprint author), Yale Univ, Energy Sci Inst, West Haven, CT 06516 USA.
推荐引用方式 GB/T 7714	Zhong, YR,Yin, LC,He, P,et al. Surface Chemistry in Cobalt Phosphide-Stabilized Lithium-Sulfur Batteries[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2018,140(4):1455-1459.
APA	Zhong, YR.,Yin, LC.,He, P.,Liu, W.,Wu, ZS.,...&Wang, HL .(2018).Surface Chemistry in Cobalt Phosphide-Stabilized Lithium-Sulfur Batteries.JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,140(4),1455-1459.
MLA	Zhong, YR,et al."Surface Chemistry in Cobalt Phosphide-Stabilized Lithium-Sulfur Batteries".JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 140.4(2018):1455-1459.