Synthesis and electrochemical characterization of xLi(Ni 0.8Co0.15Mg0.05)O2-(1-x)Li[Li 1/3Mn2/3]O2 (0.0 ≤ x ≤ 1.0) cathodes for Li rechargeable batteries

A. Pramanik, C. Ghanty, S. B. Majumder

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Using solution based processing route, we have successfully synthesized xLi(Ni0.8Co0.15Mg0.05)O2-(1-x) Li[Li1/3Mn2/3]O2 (0.0 ≤ x ≤ 1.0) cathode materials for lithium rechargeable batteries. The phase formation behavior of these cathode materials is characterized by X-ray diffraction measurements. The Galvanostatic charge-discharge characteristic of these cathodes is reported in various cut-off voltage limits. When these composite cathodes are charged to 4.8 V, electrochemical extraction of lithium takes place from active (Li[Ni 0.8Co0.15Mg0.05]O2) as well as inactive (Li[Li1/3Mn2/3]O2) components. Good cycleability of these cathodes is obtained when cycled in the cut-off voltage limits of 4.6-3.0 V. The cycleability of these cathodes are deteriorated when charged above 4.8 V and deep discharged up to 1.2 V followed by repeated cycling in these voltage limits. Based on the analyses of impedance spectra at various charge and discharge states, the probable reasons for such findings are discussed.

Original languageEnglish
Pages (from-to)1797-1802
Number of pages6
JournalSolid State Sciences
Volume12
Issue number10
DOIs
StatePublished - Oct 2010
Externally publishedYes

Bibliographical note

Funding Information:
The research work was partially supported by the research grants from the Council of Scientific and Industrial Research (CSIR), Govt. of India vide their grant 80(0066)/06/EMR-II . One of the authors (Mr. C. Ghanty) would also like to acknowledge CSIR for providing him a Junior Research Fellowship. The authors would like to thank SPECLAB, University of Puerto Rico, San Juan, USA for the coin cell fabrication and some electrochemical measurements. We would also like to thank Dr. S. Sivaprakash for many fruitful discussions.

Keywords

  • Cathode material
  • Chemical synthesis
  • Electrochemical properties
  • Impedance spectroscopy
  • Lithium ion battery

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