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

S. Gopukumar, Yonghyun Jeong, Kwang Bum Kim

Research output: Contribution to journalArticle

77 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 1

Fingerprint

Lithium
lithium
Doping (additives)
lithium oxides
cycles
Oxides
cobalt oxides
synthesis
Titanium
cells
Powders
Electrolytes
Cyclic voltammetry
spinel
Raman spectroscopy
Cobalt
titanium
Metals
electrolytes
Impurities

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Synthesis and electrochemical performance of tetravalent doped LiCoO2 in lithium rechargeable cells",
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.",
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Synthesis and electrochemical performance of tetravalent doped LiCoO2 in lithium rechargeable cells. / Gopukumar, S.; Jeong, Yonghyun; Kim, Kwang Bum.

In: Solid State Ionics, Vol. 159, No. 3-4, 01.04.2003, p. 223-232.

Research output: Contribution to journalArticle

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N2 - 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.

AB - 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.

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