Freestanding Sodium Vanadate/Carbon Nanotube Composite Cathodes with Excellent Structural Stability and High Rate Capability for Sodium-Ion Batteries
作者:Osman, S (Osman, Sahar)[ 1 ] ; Zuo, SY (Zuo, Shiyong)[ 1 ] ; Xu, XJ (Xu, Xijun)[ 1 ] ; Shen, JD (Shen, Jiadong)[ 1 ] ; Liu, ZB (Liu, Zhengbo)[ 1 ] ; Li, FK (Li, Fangkun)[ 1 ] ; Li, PH (Li, Peihang)[ 1 ] ; Wang, XY (Wang, Xinyi)[ 1 ] ; Liu, J (Liu, Jun)[ 1 ]
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ACS APPLIED MATERIALS & INTERFACES
卷: 13 期: 1 页: 816-826
DOI: 10.1021/acsami.0c21328
出版年: JAN 13 2021
文献类型:Article
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摘要
Sodium vanadate NaV6O15 (NVO) is one of the most promising cathode materials for sodium-ion batteries because of its low cost and high theoretical capacity. Nevertheless, NVO suffers from fast capacity fading and poor rate capability. Herein, a novel free-standing NVO/multiwalled carbon nanotube (MWCNT) composite film cathode was synthesized and designed by a simple hydrothermal method followed by a dispersion technique with high safety and low cost. The kinetics analysis based on cyclic voltammetry measurements reveals that the intimate integration of the MWCNT 3D porous conductive network with the 3D pillaring tunnel structure of NVO nanorods enhances the Na+ intercalation pseudocapacitive behavior, thus leading to exceptional rate capability and long lifespan. Furthermore, the NVO/MWCNT composite exhibits excellent structural stability during the charge/discharge process. With these benefits, the composite delivers a high discharge capacity of 217.2 mA h g(-1) at 0.1 A g(-1) in a potential region of 1.5-4.0 V. It demonstrates a superior rate capability of 123.7 mA h g(-1) at 10 A More encouragingly, it displays long lifespan; impressively, 96% of the initial capacity is retained at 5 A g(-1) for over 500 cycles. Our work presents a promising strategy for developing electrode materials with a high rate capability and a long cycle life.
关键词
作者关键词:sodium-ion battery; NaV6O15; carbon nanotube; freestanding; 3D tunnel structure; pseudocapacitive
KeyWords Plus:ENERGY-STORAGE; HIGH-CAPACITY; NAV6O15 NANORODS; LITHIUM; PERFORMANCE; CHALLENGES; LI; BETA-NA0.33V2O5; VOLTAGE; CARBON
作者信息
通讯作者地址:
South China University of Technology South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Peoples R China.
通讯作者地址: Zuo, SY; Liu, J (通讯作者)
显示更多 South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Peoples R China.
地址:
显示更多 [ 1 ] South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Peoples R China
电子邮件地址:shyzuo@scut.edu.cn; msjliu@scut.edu.cn
基金资助致谢
基金资助机构显示详情 授权号
National Natural Science Foundation of China (NSFC)
51771076
National Natural Science Foundation of China (NSFC)
NSFC51621001
Guangdong Pearl River Talents Plan
2017GC010218
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出版商
AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
期刊信息
Impact Factor (影响因子): Journal Citation Reports
类别 / 分类
研究方向:Science & Technology - Other Topics; Materials Science
Web of Science 类别:Nanoscience & Nanotechnology; Materials Science, Multidisciplinary