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Enhanced sodium-ion storage capability of P2/O3 biphase by Li-ion substitution into P2-type Na0.5Fe0.5Mn0.5O2 layered cathode

Title
Enhanced sodium-ion storage capability of P2/O3 biphase by Li-ion substitution into P2-type Na0.5Fe0.5Mn0.5O2 layered cathode
Author
김동원
Keywords
Sodium-ion battery; Cathode; Layered material; P2/O3 structure; Electrochemical performance
Issue Date
2019-02
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v. 296, Page. 1027-1034
Abstract
Integration of P2 and O3 phases in Na0.5Fe0.5Mn0.5O2 cathode via Li-ion substitution is proposed to enhance its electrochemical performance for sodium-ion battery applications. The formation of P2 and the combination of P2/O3 intergrowth were confirmed by X-ray diffraction refinement, high resolution transmission electron microscopy and X-ray photoelectron microscopy analyses. Various content of lithium was used to find optimum P2+O3 combinations. The optimized Li-ion substituted Na-0.5(Li0.10-Fe0.45Mn0.45)O-2 showed a high initial discharge capacity of 146.2 mAh g(-1) with improved cycling stability, whereas the pristine Na0.5Fe0.5 Mn0.5O2 initially delivered a discharge capacity of 127.0 mAh g(-1). In addition, the combination of P2+O3 increased its average voltage, which is important for achieving high energy density sodium-ion batteries. Overall, the prepared Na-0.5 (Li0.10Fe0.45Mn0.45)O(2)electrode exhibited the improved cycling performance in terms of reversible capacity and rate capability compared to pristine Na0.5Fe0.5Mn0.5O2 electrode material. (C) 2018 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0013468618326446?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/108277
ISSN
0013-4686; 1873-3859
DOI
10.1016/j.electacta.2018.11.160
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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