Towards environmentally friendly Na-ion batteries: Moisture and water stability of Na2Ti3O7

被引：40

作者：

Zarrabeitia, M. ^{[1
]}

Castillo-Martinez, E. ^{[1
]}

Lopez Del Amo, J. M. ^{[1
]}

Eguia-Barrio, A. ^{[2
]}

Munoz-Marquez, M. A. ^{[1
]}

Rojo, T. ^{[1
,2
]}

Casas-Cabanas, M. ^{[1
]}

机构：

[1] CIC Energigune, C Albert Einstein 48,Parque Tecnol Alava, Minano 01510, Spain

[2] Univ Basque Country, UPV EHU, Dept Quim Inorgan, POB 664, Leioa 48080, Spain

来源：

JOURNAL OF POWER SOURCES | 2016年 / 324卷

关键词：

Na-ion battery; Na2Ti3O7; Aqueous electrode processing; Ion exchange; Carboxymethyl cellulose; ANODE MATERIAL; NEGATIVE ELECTRODES; LAYERED TITANATES; CRYSTAL-STRUCTURE; STORAGE; NMR; EVOLUTION; EXCHANGE; H2TI3O7;

D O I：

10.1016/j.jpowsour.2016.05.103

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report here on the moisture and water stability of the promising Na-ion anode material Na2Ti3O7. Spontaneous Na+/H+ exchange is detected by PXRD after air exposure, forming solid solution compounds of the form Na2-xHxTi3O7 (0 < x < 2). By controlled ion exchange in aqueous solution two mixed compositions are prepared and their composition and structure are characterized with a panel of techniques. Both mixed compositions crystallize in C2/m space group like H2Ti3O2, and therefore Na+/H+ exchange is found to involve a structural transition from AA stacking of [TiO6] layers to AB stacking sequence. The electrochemical behaviour of the mixed compositions vs. Na+/Na is studied as well as that of an electrode of pure Na2Ti3O7 prepared in water media. The water-processed electrode is shown to exhibit a superior cycling stability and therefore the results obtained highlight the potential of Na2Ti3O7 as a green, low cost anode material for NIBs. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：378 / 387

页数：10

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