Universität zu Köln

Luo, Lan, Zhen, Yichao, Lu, Yanzhong, Zhou, Kaiqiang, Huang, Jinxian, Huang, Zhigao, Mathur, Sanjay ORCID: 0000-0003-2765-2693 and Hong, Zhensheng (2020). Structural evolution from layered Na2Ti3O7 to Na2Ti6O13 nanowires enabling a highly reversible anode for Mg-ion batteries. Nanoscale, 12 (1). S. 230 - 239. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2040-3372

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Abstract

The development of suitable host materials for the reversible storage of divalent ions such as Mg2+ is still a big challenge and its progress to date has been slow compared to that of monovalent Li+ or Na+. Herein, we present the study of layered sodium trititanate (Na2Ti3O7) and sodium hexatitanate (Na2Ti6O13) nanowires as anode materials for rechargeable Mg-ion batteries. It is found for the first time that the structural evolution from layered Na2Ti3O7 to Na2Ti6O13 with a more condensate three-dimensional microporous structure enables remarkably enhanced Mg-ion storage performance. The Na2Ti6O13 electrode can achieve a large initial discharge and charge capacity of 165.8 and 147.7 mA h g(-1) at 10 mA g(-1) with a record high initial coulombic efficiency up to 89.1%. Ex situ XRD, Raman measurements and EDX mapping were used to investigate the electrochemical reaction mechanism. It is suggested that the irreversible structure change and the formation of insoluble NaCl with high yield and large particles when Na+ is replaced by inserted Mg2+ for the Na2Ti3O7 electrode could be ascribed to the rapid decline in capacity. By contrast, the Na2Ti6O13 electrode exhibits good structure stability during the Mg-ion insertion/extraction process, leading to good rate performance and cycling stability.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Luo, Lan UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhen, Yichao UNSPECIFIED UNSPECIFIED UNSPECIFIED Lu, Yanzhong UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhou, Kaiqiang UNSPECIFIED UNSPECIFIED UNSPECIFIED Huang, Jinxian UNSPECIFIED UNSPECIFIED UNSPECIFIED Huang, Zhigao UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED orcid.org/0000-0003-2765-2693 UNSPECIFIED Hong, Zhensheng UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-349174
DOI:	10.1039/c9nr08003a
Journal or Publication Title:	Nanoscale
Volume:	12
Number:	1
Page Range:	S. 230 - 239
Date:	2020
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	2040-3372
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RECHARGEABLE MAGNESIUM BATTERY; ELECTROCHEMICAL PERFORMANCE; INSERTION; ELECTRODE; CATHODE; LITHIUM; SOLIDS; BI Multiple languages Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/34917