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

S. Gopukumar; Yonghyun Jeong; Kwang Bum Kim

doi:10.1016/S0167-2738(03)00081-X

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

S. Gopukumar, Yonghyun Jeong, Kwang Bum Kim

Department of Materials Science and Engineering

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

97 Citations (Scopus)

Abstract

Titanium-doped lithium cobalt oxides having the formula LiTi_xCo_1-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 language	English
Pages (from-to)	223-232
Number of pages	10
Journal	Solid State Ionics
Volume	159
Issue number	3-4
DOIs	https://doi.org/10.1016/S0167-2738(03)00081-X
Publication status	Published - 2003 Apr

Bibliographical note

Funding Information:
One of the authors, GK, would like to thank KOFST, Seoul, Korea, for offering a Brain Pool Visiting Fellowship. GK also thanks CECRI, Karaikudi and CSIR, New Delhi, for grant of leave. The authors thank the referees for their valuable suggestions. This work was also supported by the Ministry of Information and Communication of Korea (Support Project of University Information Technology Research Center supervised by KIPA). The authors would like to thank Cheil Industries Inc. for supporting electrolyte.

All Science Journal Classification (ASJC) codes

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

Access to Document

10.1016/S0167-2738(03)00081-X

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.",

author = "S. Gopukumar and Yonghyun Jeong and Kim, {Kwang Bum}",

note = "Funding Information: One of the authors, GK, would like to thank KOFST, Seoul, Korea, for offering a Brain Pool Visiting Fellowship. GK also thanks CECRI, Karaikudi and CSIR, New Delhi, for grant of leave. The authors thank the referees for their valuable suggestions. This work was also supported by the Ministry of Information and Communication of Korea (Support Project of University Information Technology Research Center supervised by KIPA). The authors would like to thank Cheil Industries Inc. for supporting electrolyte.",

year = "2003",

month = apr,

doi = "10.1016/S0167-2738(03)00081-X",

language = "English",

volume = "159",

pages = "223--232",

journal = "Solid State Ionics",

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T1 - Synthesis and electrochemical performance of tetravalent doped LiCoO2 in lithium rechargeable cells

AU - Gopukumar, S.

AU - Jeong, Yonghyun

AU - Kim, Kwang Bum

N1 - Funding Information: One of the authors, GK, would like to thank KOFST, Seoul, Korea, for offering a Brain Pool Visiting Fellowship. GK also thanks CECRI, Karaikudi and CSIR, New Delhi, for grant of leave. The authors thank the referees for their valuable suggestions. This work was also supported by the Ministry of Information and Communication of Korea (Support Project of University Information Technology Research Center supervised by KIPA). The authors would like to thank Cheil Industries Inc. for supporting electrolyte.

PY - 2003/4

Y1 - 2003/4

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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