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

Jeong Hoo Hong, Gi Dae Park, Dae Soo Jung, Yun Chan Kang

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish
Article number154309
JournalJournal of Alloys and Compounds
Volume827
DOIs
Publication statusPublished - 2020 Jun 25

Keywords

  • Anode materials
  • Conversion mechanism
  • Copper selenite
  • Heterostructure
  • Li-ion batteries
  • Spray pyrolysis

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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