Electrochemical lithium intercalation into Bi2Sr 2CaCu2O8+δ

Takahiro Shimono, Wataru Kobayashi, Hiroaki Nitani, Reiji Kumai, Yutaka Moritomo

Research output: Contribution to journalArticle

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Abstract

We have prepared Li-intercalated LixBi2Sr2CaCu2O8+δ (x =0-2.0) samples by using electrochemical method, and performed synchrotron x-ray diffraction, Cu K-edge x-ray absorption fine structure (XAFS), and magnetic susceptibility measurements. With increasing x, a- and c-lattice parameters monotonically increase, which shows lithium intercalation into Bi2Sr2CaCu2O8+δ. Accompanied by the lithium insertion, the valence of Cu ion changes from Cu2+/Cu3+ to Cu1+/Cu 2+ to realize charge neutrality. This change of the valence was detected by Cu K-edge XAFS measurement. A clear increase of spectral weight that corresponds to 1s→ 4pπ(3d10L) was observed at around 8982 eV with x. The superconducting (SC) transition temperature TC significantly changes from 74 K for x = 0 to 90 K for x = 0.8, which is attributed to modified density of states by the decrease of hole concentration. A volume fraction of the superconducting phase was 1-2 % for x ≥ 0.6 implying phase separation where Li-rich non SC phase and Li-poor SC phase coexist. Such a phase separation is universally seen in electrode active materials.

Original languageEnglish
Article number012021
JournalJournal of Physics: Conference Series
Volume428
Issue number1
DOIs
Publication statusPublished - 2013
Externally publishedYes

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x ray absorption
intercalation
lithium
fine structure
valence
insertion
lattice parameters
synchrotrons
x ray diffraction
transition temperature
magnetic permeability
electrodes
ions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Shimono, T., Kobayashi, W., Nitani, H., Kumai, R., & Moritomo, Y. (2013). Electrochemical lithium intercalation into Bi2Sr 2CaCu2O8+δ . Journal of Physics: Conference Series, 428(1), [012021]. https://doi.org/10.1088/1742-6596/428/1/012021

Electrochemical lithium intercalation into Bi2Sr 2CaCu2O8+δ . / Shimono, Takahiro; Kobayashi, Wataru; Nitani, Hiroaki; Kumai, Reiji; Moritomo, Yutaka.

In: Journal of Physics: Conference Series, Vol. 428, No. 1, 012021, 2013.

Research output: Contribution to journalArticle

Shimono, T, Kobayashi, W, Nitani, H, Kumai, R & Moritomo, Y 2013, 'Electrochemical lithium intercalation into Bi2Sr 2CaCu2O8+δ ', Journal of Physics: Conference Series, vol. 428, no. 1, 012021. https://doi.org/10.1088/1742-6596/428/1/012021
Shimono, Takahiro ; Kobayashi, Wataru ; Nitani, Hiroaki ; Kumai, Reiji ; Moritomo, Yutaka. / Electrochemical lithium intercalation into Bi2Sr 2CaCu2O8+δ . In: Journal of Physics: Conference Series. 2013 ; Vol. 428, No. 1.
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