Effect of Cr dopant on the cathodic behavior of LiCoO2

S. Madhavi; G. V. Subba Rao; B. V.R. Chowdari; S. F.Y. Li

doi:10.1016/S0013-4686(02)00594-7

Effect of Cr dopant on the cathodic behavior of LiCoO₂

S. Madhavi, G. V. Subba Rao, B. V.R. Chowdari^*, S. F.Y. Li

^*Corresponding author for this work

National University of Singapore

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

68 Citations (Scopus)

Abstract

Compounds of the formula LiCo_1-yCr_yO₂ (0.0≤y≤0.20 and y=1.0) have been synthesized by high temperature solid-state reaction and were characterized by XRD and FT-IR. Hexagonal a and c lattice parameters increase with increasing y as expected from ionic size effects. Cyclic voltammograms reveal that the phase transformation occurring at x=0.5 in Li_1-x(Co_1-yCr_y)O₂ is suppressed for y=0.05 and 0.10. Low-current (0.01 C; 1 C=140 mA g^-1) galvanostatic charging curves show that the deintercalation voltage for y=0.05 and 0.10 decrease for a given x as compared to LiCoO₂. Galvanostatic charge-discharge cycling of the Li(Co_1-yCr_y)O₂ cathodes at 0.14 C and 2.7-4.3 V (vs. Li) show that increasing amount of chromium content in the LiCoO₂ lattice drastically reduces the amount of Li that can be reversibly cycled. Ex-situ XRD of the cycled cathodes show that slight cation-mixing occurs in the layered structure for y=0.05 and 0.10 and could be the reason for their poor electrochemical performance. Reversible Li intercalation/deintercalation is not possible in LiCrO₂ in the voltage range 2.7-4.3 V.

Original language	English
Pages (from-to)	219-226
Number of pages	8
Journal	Electrochimica Acta
Volume	48
Issue number	3
DOIs	https://doi.org/10.1016/S0013-4686(02)00594-7
Publication status	Published - Dec 11 2002
Externally published	Yes

ASJC Scopus Subject Areas

General Chemical Engineering
Electrochemistry

Keywords

Cathodes
Doping
LiCoO
LiCrO
Lithium ion batteries

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/S0013-4686(02)00594-7

Cite this

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title = "Effect of Cr dopant on the cathodic behavior of LiCoO2",

abstract = "Compounds of the formula LiCo1-yCryO2 (0.0≤y≤0.20 and y=1.0) have been synthesized by high temperature solid-state reaction and were characterized by XRD and FT-IR. Hexagonal a and c lattice parameters increase with increasing y as expected from ionic size effects. Cyclic voltammograms reveal that the phase transformation occurring at x=0.5 in Li1-x(Co1-yCry)O2 is suppressed for y=0.05 and 0.10. Low-current (0.01 C; 1 C=140 mA g-1) galvanostatic charging curves show that the deintercalation voltage for y=0.05 and 0.10 decrease for a given x as compared to LiCoO2. Galvanostatic charge-discharge cycling of the Li(Co1-yCry)O2 cathodes at 0.14 C and 2.7-4.3 V (vs. Li) show that increasing amount of chromium content in the LiCoO2 lattice drastically reduces the amount of Li that can be reversibly cycled. Ex-situ XRD of the cycled cathodes show that slight cation-mixing occurs in the layered structure for y=0.05 and 0.10 and could be the reason for their poor electrochemical performance. Reversible Li intercalation/deintercalation is not possible in LiCrO2 in the voltage range 2.7-4.3 V.",

keywords = "Cathodes, Doping, LiCoO, LiCrO, Lithium ion batteries",

author = "S. Madhavi and \{Subba Rao\}, \{G. V.\} and Chowdari, \{B. V.R.\} and Li, \{S. F.Y.\}",

year = "2002",

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doi = "10.1016/S0013-4686(02)00594-7",

language = "English",

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T1 - Effect of Cr dopant on the cathodic behavior of LiCoO2

AU - Madhavi, S.

AU - Subba Rao, G. V.

AU - Chowdari, B. V.R.

AU - Li, S. F.Y.

PY - 2002/12/11

Y1 - 2002/12/11

N2 - Compounds of the formula LiCo1-yCryO2 (0.0≤y≤0.20 and y=1.0) have been synthesized by high temperature solid-state reaction and were characterized by XRD and FT-IR. Hexagonal a and c lattice parameters increase with increasing y as expected from ionic size effects. Cyclic voltammograms reveal that the phase transformation occurring at x=0.5 in Li1-x(Co1-yCry)O2 is suppressed for y=0.05 and 0.10. Low-current (0.01 C; 1 C=140 mA g-1) galvanostatic charging curves show that the deintercalation voltage for y=0.05 and 0.10 decrease for a given x as compared to LiCoO2. Galvanostatic charge-discharge cycling of the Li(Co1-yCry)O2 cathodes at 0.14 C and 2.7-4.3 V (vs. Li) show that increasing amount of chromium content in the LiCoO2 lattice drastically reduces the amount of Li that can be reversibly cycled. Ex-situ XRD of the cycled cathodes show that slight cation-mixing occurs in the layered structure for y=0.05 and 0.10 and could be the reason for their poor electrochemical performance. Reversible Li intercalation/deintercalation is not possible in LiCrO2 in the voltage range 2.7-4.3 V.

AB - Compounds of the formula LiCo1-yCryO2 (0.0≤y≤0.20 and y=1.0) have been synthesized by high temperature solid-state reaction and were characterized by XRD and FT-IR. Hexagonal a and c lattice parameters increase with increasing y as expected from ionic size effects. Cyclic voltammograms reveal that the phase transformation occurring at x=0.5 in Li1-x(Co1-yCry)O2 is suppressed for y=0.05 and 0.10. Low-current (0.01 C; 1 C=140 mA g-1) galvanostatic charging curves show that the deintercalation voltage for y=0.05 and 0.10 decrease for a given x as compared to LiCoO2. Galvanostatic charge-discharge cycling of the Li(Co1-yCry)O2 cathodes at 0.14 C and 2.7-4.3 V (vs. Li) show that increasing amount of chromium content in the LiCoO2 lattice drastically reduces the amount of Li that can be reversibly cycled. Ex-situ XRD of the cycled cathodes show that slight cation-mixing occurs in the layered structure for y=0.05 and 0.10 and could be the reason for their poor electrochemical performance. Reversible Li intercalation/deintercalation is not possible in LiCrO2 in the voltage range 2.7-4.3 V.

KW - Cathodes

KW - Doping

KW - LiCoO

KW - LiCrO

KW - Lithium ion batteries

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