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Lithium ion storage mechanism exploration of copper selenite as anode materials for lithium-ion batteries

Authors
Hong, Jeong HooPark, Gi DaeJung, Dae SooKang, Yun Chan
Issue Date
25-6월-2020
Publisher
ELSEVIER SCIENCE SA
Keywords
Copper selenite; Heterostructure; Spray pyrolysis; Conversion mechanism; Anode materials; Li-ion batteries
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.827
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF ALLOYS AND COMPOUNDS
Volume
827
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/54970
DOI
10.1016/j.jallcom.2020.154309
ISSN
0925-8388
Abstract
Copper-based materials as electrode materials have been attracted attention for their various merits such as nature abundance, low-cost, easy preparation, chemical stability, high theoretical specific capacity, and environmental friendliness. Metal selenite materials transforming into heterostructured metal oxide and selenide during the first cycle was considered as efficient anode materials for lithium-ion batteries. Herein, copper selenite microspheres were synthesized by applying facile spray pyrolysis process and for the first time, their conversion reaction mechanism with lithium-ions was systematically comprehended by various in-situ and ex-situ analysis. The selenization of spray pyrolysis product (Cu nitrate-polyvinylpyrrolidone composite) yielded cooper selenide (CuxSe)-C composite. Subsequently, partial oxidation process produced carbon-free hollow cooper selenite (Cu2O(SeO3)) microspheres. Through the various technical measurements, the following reversible reaction mechanism of Cu2O(SeO3) phase could be confirmed from the second cycle onward: CuO + CuSe + 4Li(+) + 4e(-) <-> 2Cu + Li2O + Li2Se. Moreover, hollow Cu2O(SeO3) microspheres showed excellent cycling and rate performances. The discharge capacity of Cu2O(SeO3) for 500th cycle at a current density of 3.0 A g(-1) is 645 mA h g(-1) and exhibited a stable reversible capacity even at extremely high current density of 30 A g(-1). (C) 2020 Elsevier B.V. All rights reserved.
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