Comparative electrochemical sodium insertion/extraction behavior in layered NaxVS2 and NaxTiS2

被引：29

作者：

Lee, Eungje ^{[1
]}

Sahgong, SunHye ^{[2
]}

Johnson, Christopher S. ^{[1
]}

Kim, Youngsik ^{[2
]}

机构：

[1] Argonne Natl Lab, Chem Sci & Engn Div, Electrochem Energy Storage Dept, Argonne, IL 60439 USA

[2] Ulsan Natl Inst Sci & Technol, Sch Energy & Chem Engn, Ulsan 689798, South Korea

来源：

ELECTROCHIMICA ACTA | 2014年 / 143卷

关键词：

NaVS2; NaTiS2; Layered sulfides; Sodium intercalation; Displacement conversion reaction; LI-ION BATTERIES; ELECTRODE MATERIALS; INTERCALATION COMPOUNDS; HIGH-CAPACITY; NA; CHALLENGES; PERFORMANCE; DISULFIDE; INSERTION; NACRO2;

D O I：

10.1016/j.electacta.2014.08.032

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

This study investigates the electrochemical sodium insertion/extraction of NaxVS2, and NaxTiS2 in the voltage range where either intercalation (0.2 <= x <= 1) or displacement-conversion reaction (x > 1) occurs. Both NaxVS2 and NaxTiS2 showed good reversible capacities, as high as similar to 160 mAh/g at an average voltage of similar to 1.9 V vs. Na in the region for the intercalation reaction (0.2 <= x <= 1). When sodium (Na) insertion was forced further to the x > 1 composition, NaxVS2 exhibited the direct displacement-conversion reaction at 0.3 V vs. Na without further Na intercalation, which contrasted with the wider lithium intercalation range of 0 < x <= 2 for LixVS2. The displacement-conversion reaction for NaxVS2 (x > 1) was reversible with a specific capacity of above 200 mAh/g up to 15 cycles, but the displacement reaction for NaxTiS2 (x > 1) was not observed. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：272 / 277

页数：6

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