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Multidimensional Na4VMn0.9Cu0.1(PO4)(3)/C cotton-candy cathode materials for high energy Na-ion batteries

Title
Multidimensional Na4VMn0.9Cu0.1(PO4)(3)/C cotton-candy cathode materials for high energy Na-ion batteries
Author
선양국
Keywords
HIGH-VOLTAGE; SODIUM; LITHIUM; ELECTRODE; NA3V2(PO4)(3); NANOCOMPOSITE; CONSTRUCTION; EXPLORATION; MIGRATION; COMPOSITE
Issue Date
2020-05
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v. 8, no. 24, page. 12055-12068
Abstract
Sodium-ion batteries (SIBs) have attracted great attention for day-to-day applications as a replacement for lithium-ion batteries (LIBs) that deliver high voltage and high energy because of the low battery-preparation cost and vast availability of sodium resources. The recent exploration of Na(+)superionic conductor or NASICON-type Na4VMn(PO4)(3)(NVMP) cathodes for SIBs is a pioneering approach because of the high working voltage, high theoretical capacity, and stable three-dimensional framework of the NVMP cathodes. However, the inherently low electronic conductivity results in mediocre rate outputs and poor exploitation of the active material. Herein, we report, for the first time, the preparation of a cotton candy-like carbon-coated Cu-doped NVMP or Na4VMn0.9Cu0.1(PO4)(3)(NVMCP/C/CC) cathode by a facile and ultrafast pyro-synthetic method. The robust structure of the NVMCP/C/CC and the highly reversible two-phase reaction upon Na-ion insertion/extraction were systematically revealed by thein situsynchrotron XRD and GITT studies, while the DFT calculations established the crucial reasons behind the enhanced electronic conduction of the NVMCP/C/CC. The superior electrochemical properties of the NVMCP/C/CC cathode at low (79 mA h g(-1)after 450 cycles at 1.5C) and high current rates (68 mA h g(-1)after 3000 cycles at 30C) demonstrate that the combination of a three-dimensional nanoarchitecture, uniform carbon-coating, and Cu-doping is favorable for improving the electrochemical properties of the NVMP cathodes.
URI
https://pubs.rsc.org/en/content/articlelanding/2020/TA/D0TA03767Bhttps://repository.hanyang.ac.kr/handle/20.500.11754/166215
ISSN
2050-7488; 2050-7496
DOI
10.1039/d0ta03767b
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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