Surface Chemistry in Cobalt Phosphide-Stabilized Lithium-Sulfur Batteries
文献类型：期刊论文
| 作者 | 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
 |
| 出版日期 | 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 |
| 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. |
入库方式： OAI收割
来源：金属研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。