A Scalable Approach to Na2FeP2O7@Carbon/Expanded Graphite as a Low-Cost and High-Performance Cathode for Sodium-Ion Batteries

时间:2020-12-10作者:浏览量:251


A Scalable Approach to Na2FeP2O7@Carbon/Expanded Graphite as a Low-Cost and High-Performance Cathode for Sodium-Ion Batteries

作者:Zeng, LY (Zeng, Liyan)[ 1,2 ] ; Li, FK (Li, Fangkun)[ 1,2 ] ; Xu, XJ (Xu, Xijun)[ 1,2 ] ; Liu, ZB (Liu, Zhengbo)[ 1,2 ] ; Shen, JD (Shen, Jiadong)[ 1,2 ] ; Zhang, DC (Zhang, Dechao)[ 1,2 ] ; Li, Y (Li, Yu)[ 1,2 ] ; Liu, J (Liu, Jun)[ 1,2 ]


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CHEMELECTROCHEM


卷: 7 期: 18 页: 3874-3882

DOI: 10.1002/celc.202001087


出版年: SEP 15 2020


文献类型:Article


摘要

Sodium-ion batteries (SIBs) are the most promising candidates as alternatives to lithium-ion batteries (LIBs), owing to the natural abundance of sodium salt and the low cost. However, the commercial application of SIBs is principally hampered by the absence of suitable cathode materials. Herein, a novel Na2FeP2O7@carbon/expanded graphite (NFPO@C/EG) composite with a unique microstructure was developed through a scalable sol-gel process followed by a ball-milling procedure with expanded graphite. Benefiting from the multiscale carbon-modified structure, the NFPO@C/EG effectively improves the electronic conductivity and, at the same time, shortens the path of sodium ion transmission. As a consequence, the NFPO@C/EG cathode presents a much higher specific capacity and more stable cycling stability than NFPO@C and NFPO. The unique design of NFPO@C/EG endows a high ratio of pseudocapacitance contribution and a large Na(+)diffusion coefficient. As a consequence, the NFPO@C/EG cathode displays stable cycle performance (82 mAh g(-1)over 400 cycles at 232 mA g(-1)) and superior rate capability (60 mAh g(-1)at a high charge/discharge density of 2320 mA g(-1)). This multiscale carbon-modified design concept builds an avenue for the practical application of polyanionic cathode materials and promotes the development of low-cost SIBs.


关键词

作者关键词:Na2FeP2O7; carbon encapsulation; expanded graphite; cathode materials; sodium-ion batteries


KeyWords Plus:IRON-BASED CATHODE; LONG-CYCLE; LITHIUM; PYROPHOSPHATE; NA3V2(PO4)(3); NA2FEP2O7; GRAPHENE; ANODE; NANOTUBES; COMPOSITE


作者信息

通讯作者地址:


South China University of Technology South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China.

South China University of Technology South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Peoples R China.

通讯作者地址: Xu, XJ; Liu, J (通讯作者)


显示更多South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China.

通讯作者地址: Xu, XJ; Liu, J (通讯作者)

显示更多South China Univ Technol, 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, Guangzhou 510641, Peoples R China

显示更多[ 2 ]‎ South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Peoples R China

电子邮件地址:xuxijun2013@163.com; msjliu@scut.edu.cn


出版商

WILEY-V C H VERLAG GMBH, POSTFACH 101161, 69451 WEINHEIM, GERMANY


期刊信息

Impact Factor (影响因子): Journal Citation Reports

类别 / 分类

研究方向:Electrochemistry


Web of Science 类别:Electrochemistry