Electrochemical characterization of non-stoichiometric Cu2Sx cathode for lithium batteries

Gulnur Kalimuldina; Izumi Taniguchi

doi:10.1007/s10008-017-3625-0

Electrochemical characterization of non-stoichiometric Cu2Sx cathode for lithium batteries

Gulnur Kalimuldina
, Izumi Taniguchi

Department of Chemical and Materials Engineering

Tokyo Institute of Technology

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Electrochemical performances of non-stoichiometric Cu₂S_x (1.25 ≤ x ≤ 0.625) cathodes prepared by spray pyrolysis and followed annealing were investigated after coating on carbon fiber paper (CFP) and Cu foil current collectors. The chemical composition influence on the electrochemical properties of Cu₂S_x was noticeably observed on a Cu foil current collector, especially at higher charge-discharge rates. Electrochemical impedance spectroscopy revealed that Cu/S ≈ 3.2 M ratio electrode shows lower interfacial charge transfer resistance (R_ct) after 5 cycles at 0.1 C compared with Cu/S ≈ 1.6 M ratio electrode on both current collectors. Accordingly, the electrode with Cu/S ≈ 3.2 M ratio showed the highest discharge capacity of 350 mAh g⁻¹ at 5 C on a Cu foil current collector. The excess of Cu in Cu₂S_x enhanced electrode utilization with the cycle number and facilitated fast charge transfer.

Original language	English
Article number	21
Pages (from-to)	3057-3063
Number of pages	7
Journal	Journal of Solid State Electrochemistry
Volume	21
Issue number	10
DOIs	https://doi.org/10.1007/s10008-017-3625-0
Publication status	Published - Oct 1 2017

Funding

This research was partially supported by the Ministry of Education, Culture, Sports, Science and Technology of Japan (Grant No. 15H04251).

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 3 Good Health and Well-being
SDG 7 Affordable and Clean Energy

Keywords

Cathode
Chemical composition
Copper sulfide
Lithium-ion battery
Spray pyrolysis

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Electrochemistry
Electrical and Electronic Engineering

Access to Document

10.1007/s10008-017-3625-0

Cite this

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title = "Electrochemical characterization of non-stoichiometric Cu2Sx cathode for lithium batteries",

abstract = "Electrochemical performances of non-stoichiometric Cu2Sx (1.25 ≤ x ≤ 0.625) cathodes prepared by spray pyrolysis and followed annealing were investigated after coating on carbon fiber paper (CFP) and Cu foil current collectors. The chemical composition influence on the electrochemical properties of Cu2Sx was noticeably observed on a Cu foil current collector, especially at higher charge-discharge rates. Electrochemical impedance spectroscopy revealed that Cu/S ≈ 3.2 M ratio electrode shows lower interfacial charge transfer resistance (Rct) after 5 cycles at 0.1 C compared with Cu/S ≈ 1.6 M ratio electrode on both current collectors. Accordingly, the electrode with Cu/S ≈ 3.2 M ratio showed the highest discharge capacity of 350 mAh g−1 at 5 C on a Cu foil current collector. The excess of Cu in Cu2Sx enhanced electrode utilization with the cycle number and facilitated fast charge transfer.",

keywords = "Cathode, Chemical composition, Copper sulfide, Lithium-ion battery, Spray pyrolysis",

author = "Gulnur Kalimuldina and Izumi Taniguchi",

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AU - Kalimuldina, Gulnur

AU - Taniguchi, Izumi

N1 - Funding Information: This research was partially supported by the Ministry of Education, Culture, Sports, Science and Technology of Japan (Grant No. 15H04251). Publisher Copyright: © 2017, Springer-Verlag Berlin Heidelberg.

PY - 2017/10/1

Y1 - 2017/10/1

N2 - Electrochemical performances of non-stoichiometric Cu2Sx (1.25 ≤ x ≤ 0.625) cathodes prepared by spray pyrolysis and followed annealing were investigated after coating on carbon fiber paper (CFP) and Cu foil current collectors. The chemical composition influence on the electrochemical properties of Cu2Sx was noticeably observed on a Cu foil current collector, especially at higher charge-discharge rates. Electrochemical impedance spectroscopy revealed that Cu/S ≈ 3.2 M ratio electrode shows lower interfacial charge transfer resistance (Rct) after 5 cycles at 0.1 C compared with Cu/S ≈ 1.6 M ratio electrode on both current collectors. Accordingly, the electrode with Cu/S ≈ 3.2 M ratio showed the highest discharge capacity of 350 mAh g−1 at 5 C on a Cu foil current collector. The excess of Cu in Cu2Sx enhanced electrode utilization with the cycle number and facilitated fast charge transfer.

AB - Electrochemical performances of non-stoichiometric Cu2Sx (1.25 ≤ x ≤ 0.625) cathodes prepared by spray pyrolysis and followed annealing were investigated after coating on carbon fiber paper (CFP) and Cu foil current collectors. The chemical composition influence on the electrochemical properties of Cu2Sx was noticeably observed on a Cu foil current collector, especially at higher charge-discharge rates. Electrochemical impedance spectroscopy revealed that Cu/S ≈ 3.2 M ratio electrode shows lower interfacial charge transfer resistance (Rct) after 5 cycles at 0.1 C compared with Cu/S ≈ 1.6 M ratio electrode on both current collectors. Accordingly, the electrode with Cu/S ≈ 3.2 M ratio showed the highest discharge capacity of 350 mAh g−1 at 5 C on a Cu foil current collector. The excess of Cu in Cu2Sx enhanced electrode utilization with the cycle number and facilitated fast charge transfer.

KW - Cathode

KW - Chemical composition

KW - Copper sulfide

KW - Lithium-ion battery

KW - Spray pyrolysis

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Electrochemical characterization of non-stoichiometric Cu2Sx cathode for lithium batteries

Abstract

Funding

UN SDGs

Keywords

ASJC Scopus subject areas

Access to Document

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