DataVXACS Applied Materials & InterfacesPaper
journal article·2020-11-25

Boosting Capacitive Sodium-Ion Storage in Electrochemically Exfoliated Graphite for Sodium-Ion Capacitors

Ting Huang, Zaichun Liu, Feng Yu, Faxing Wang, Dongqi Li, Lijun Fu, Yuhui Chen, Hongxia Wang, Qingji Xie, Shouzhuo Yao, Yuping Wu

ACS Applied Materials & Interfaces· Volume 12· Issue 47
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Source abstract

Abstract

Sodium (Na)-ion capacitors possess higher energy density than supercapacitors and higher power density than Na-ion batteries. However, kinetic mismatches between fast capacitive charge storage on the cathode and sluggish battery-type reactions on the anode lead to a poor charge/discharge rate capability and insufficient power output of Na-ion capacitors. Thus, developing suitable anode materials for Na-ion capacitors is urgently desirable. This work demonstrates an electrochemically exfoliated graphite (EEG) anode with enhanced capacitive charge storage, greatly boosting the Na-ion reaction kinetics of co-intercalation. The EEG anode shows a high reversible capacity of 109 mAh g–1 and maintains a good capacity retention of 90% after 1000 cycles. The assembled Na-ion capacitor using the EEG anode can finish the charge/discharge process in less than 10 s, which achieves an ultrahigh power density of 17,500 W kg–1 with an energy density of 17 Wh kg–1. The high capacitive contributions at both the anode and cathode contribute to the fast rate capability and high power output of the fabricated Na-ion capacitors. This work will promote the development of ultrafast charging sodium-ion storage devices.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Supercapacitor Materials and Fabrication · Advanced Battery Materials and Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research (Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, Hunan, China

School of Energy Science and Engineering & Institute of Advanced Materials, Nanjing Tech University, Nanjing 211816, Jiangsu Province, China

Institute of Advanced Materials and Flexible Electronics (IAMFE), School of Chemistry and Materials Science, Nanjing University of Information Science and Technology, Nanjing 210044, China

School of Chemistry and Physics, Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD 4001, Australia

Department of Chemistry and Food Chemistry & Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden, 01062 Dresden, Germany

Funding

Hunan Provincial Innovation Foundation for Postgraduate · National Natural Science Foundation of China · Foundations of the Education Department, Science & Technology Department of Hunan Province · Sanyo Chemical Co. Ltd. · Research Foundation of State Key Lab · Hunan Lotus Scholars Program

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