Investigation of the Na Intercalation Mechanism into Nanosized V2O5/C Composite Cathode Material for Na-Ion Batteries

被引：84

作者：

Ali, Ghulam ^{[1
,2
]}

Lee, Ji-Hoon ^{[1
]}

Oh, Si Hyoung ^{[1
,2
]}

Cho, Byung Won ^{[1
]}

Nam, Kyung-Wan ^{[3
]}

Chung, Kyung Yoon ^{[1
,2
]}

机构：

[1] Korea Inst Sci & Technol, Ctr Energy Convergence Res, Hwarang Ro 14-Gil 5, Seoul 136791, South Korea

[2] Korea Univ Sci & Technol, 217 Gajeong Ro, Daejeon 305333, South Korea

[3] Dongguk Univ Seoul, Dept Energy & Mat Engn, Seoul 100715, South Korea

来源：

ACS APPLIED MATERIALS & INTERFACES | 2016年 / 8卷 / 09期

关键词：

Na-ion batteries; nanosized V2O5; NaV2O5; X-ray diffraction; near-edge X-ray absorption fine structure; CORE-SHELL STRUCTURE; ABSORPTION-SPECTROSCOPY; VANADIUM-OXIDES; HIGH-CAPACITY; CARBON; NANOCOMPOSITE;

D O I：

10.1021/acsami.5b11954

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

There is a significant interest to develop high-performance and cost-effective electrode materials for next-generation sodium ion batteries. Herein, we report a facile synthesis method for nanosized V2O5/C composite cathodes and their electrochemical performance as well as energy storage mechanism. The composite exhibits a discharge capacity of 255 mAh g(-1) at a current density of 0.05 C, which surpasses that of previously reported layered oxide materials. Furthermore, the electrode shows good rate capability; discharge capacity of 160 mAh g(-1) at a current density of 1 C. The reaction mechanism of V2O5 upon sodium insertion/extraction is investigated using ex situ X-ray diffraction (XRD) and synchrotron based near edge X-ray absorption fine structure (NEXAFS) spectroscopy. Ex situ XRD result of the fully discharged state reveals the appearance of NaV2O5 as a major phase with minor Na2V2O5 phase. Upon insertion of sodium into the array of parallel ladders of V2O5, it was confirmed that lattice parameter of c is increased by 9.09%, corresponding to the increase in the unit-cell volume of 9.2%. NEXAFS results suggest that the charge compensation during de/sodiation process accompanied by the reversible changes in the oxidation state of vanadium (V4+ <-> V5+).

引用

页码：6032 / 6039

页数：8

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