Synthesis and electrochemical performance of tetravalent doped LiCoO2 in lithium rechargeable cells

S. Gopukumar, Yonghyun Jeong, Kwang Bum Kim

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

Titanium-doped lithium cobalt oxides having the formula LiTixCo1-xO2 (0 ≤ x ≤ 0.5) have been synthesized using high temperature solid-state technique and its performance in a lithium rechargeable cell is reported. The synthesized oxides were structurally analyzed using X-ray diffraction (XRD) and Raman spectroscopy. It has been observed that single-phase materials were below 10% of Ti doping whereas impurity spinel phases were detected at higher concentrations. Electrochemical behaviors of the prepared powders were analyzed using cyclic voltammetry (CV) and galvanostatic charge/discharge cycling studies in the voltage range 3.0-4.25 V (vs. Li metal) using 1 M LiClO4/PC as electrolyte. The composition with x = 0.01 exhibits an initial charge and discharge capacity of 157 and 148 mA h/g at 0.2C rate, respectively, as compared to 137 and 134 mA h/g of LiCoO2. Further, more than 90% of the capacity is retained even after 10 cycles. The role of tetravalent doping on the electrochemical behavior of LiCoO2 has not been reported previously.

Original languageEnglish
Pages (from-to)223-232
Number of pages10
JournalSolid State Ionics
Volume159
Issue number3-4
DOIs
Publication statusPublished - 2003 Apr

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Synthesis and electrochemical performance of tetravalent doped LiCoO<sub>2</sub> in lithium rechargeable cells'. Together they form a unique fingerprint.

  • Cite this