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Title:
Self-Established Rapid Magnesiation/De-Magnesiation Pathways in Binary Selenium-Copper Mixtures with Significantly Enhanced Mg-Ion Storage Reversibility
Author: Zhang, Zhonghua1,2; Chen, Bingbing1; Xu, Huimin3; Cui, Zili1; Dong, Shanmu1; Du, Aobing1,2; Ma, Jun1; Wang, Qingfu1; Zhou, Xinhong3; Cui, Guanglei1
Source: ADVANCED FUNCTIONAL MATERIALS
Issued Date: 2018-01-04
Volume: 28, Issue:1
Keyword: displacement reactions ; high reversibility ; intercalation reactions ; magnesium batteries ; selenium cathodes
DOI: 10.1002/adfm.201701718
DOC Type: Article
English Abstract: Rechargeable magnesium/sulfur (Mg/S) and magnesium/selenium (Mg/Se) batteries are characterized by high energy density, inherent safety, and economical effectiveness, and therefore, are of great scientific and technological interest. However, elusive challenges, including the limited charge storage capacity, low Coulombic efficiency, and short cycle life, have been encountered due to the sluggish electrochemical kinetics and severe shuttles of ploysulfides (polyselenide). Taking selenium as model paradigm, a new and reliable Mg-Se chemistry is proposed through designing binary selenium-copper (Se-Cu) cathodes. An intriguing effect of Cu powders on the electrochemical reaction pathways of the active Se microparticles is revealed in a way of forming Cu3Se2 intermediates, which induces an unconventional yet reversible two-stage magnesiation mechanism: Mg-ions first insert into Cu3Se2 phases; in a second step Cu-ions in the Mg2xCu3Se2 lattice exchange with Mg-ions. As expected, binary Se-Cu electrodes show significantly improved reversibility and elongated cycle life. More bracingly, Se/C nanostructures fabricated by facile blade coating Se nanorodes onto copper foils exhibit high output power and capacity (696.0 mAh g(-1) at 67.9 mA g(-1)), which outperforms all previously reported Mg/Se batteries. This work envisions a facile and reliable strategy to achieve better reversibility and long-term durability of selenium (sulfur) electrodes.
WOS Headings: Science & Technology ; Physical Sciences ; Technology
WOS Subject: Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS Subject Extended: Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
WOS Keyword Plus: POSITIVE ELECTRODE ; CRYSTAL-STRUCTURE ; SULFUR CATHODE ; BATTERIES ; LITHIUM ; ENERGY ; CAPACITY ; XPS
Indexed Type: SCI
Funder: National Science Fund for Distinguished Young Scholars(51625204) ; National Natural Science Foundation of China(51502319) ; Shandong Provincial Natural Science Foundation(ZR2016BQ18)
Language: 英语
WOS ID: WOS:000419025200020
Citation statistics:
Content Type: 期刊论文
URI: http://ir.qibebt.ac.cn/handle/337004/10015
Appears in Collections:仿生能源与储能系统团队_期刊论文

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description.institution: 1.Chinese Acad Sci, Qingdao Ind Energy Storage Res Inst, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao 266101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100190, Peoples R China
3.Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, Qingdao 266042, Peoples R China

Recommended Citation:
Zhang, Zhonghua,Chen, Bingbing,Xu, Huimin,et al. Self-Established Rapid Magnesiation/De-Magnesiation Pathways in Binary Selenium-Copper Mixtures with Significantly Enhanced Mg-Ion Storage Reversibility[J]. ADVANCED FUNCTIONAL MATERIALS,2018,28(1).
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