Study of the electrochemical properties of Ga-doped LiNi 0.8Co0.2O2 synthesized by a sol-gel method

Chang Joo Han; Won Sob Eom; Sang Myoung Lee; Won Il Cho; Ho Jang

doi:10.1016/j.jpowsour.2004.12.021

Study of the electrochemical properties of Ga-doped LiNi _0.8Co_0.2O₂ synthesized by a sol-gel method

Chang Joo Han, Won Sob Eom, Sang Myoung Lee, Won Il Cho, Ho Jang

Department of Materials Science and Engineering

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

33 Citations (Scopus)

Abstract

The effects of gallium doping on the structure and electrochemical properties of LiNi_0.8Co_0.2O₂ were investigated by X-ray diffraction, cyclic voltammetry and charge-discharge tests. LiNi _0.8Co_0.2-xGa_xO₂ (x = 0.01, 0.03, 0.05) was synthesized using a sol-gel method and it showed the average particle size less than 1 μm in diameter. Results showed that gallium-doping had no effect on the crystal structure (α-NaFeO₂) of the cathode material in the range x ≤ 0.05. On the other hand, two transitions at 3.7-3.9 and 4.2-4.7 V observed during the cycle test were merged into one when the amount of gallium doping increases to 0.05, implying that the enhanced capacity retention with gallium doping is attributed to the suppression of the phase transition of the cathode. However, the increase of gallium content in LiNi _0.8Co_0.2O₂ slightly decreases the initial discharge capacity.

Original language	English
Pages (from-to)	214-219
Number of pages	6
Journal	Journal of Power Sources
Volume	144
Issue number	1
DOIs	https://doi.org/10.1016/j.jpowsour.2004.12.021
Publication status	Published - 2005 Jun 1

Keywords

Cathode
LiNiCoGa O
Phase transition
Sol-gel method

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

UN SDGs

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

Access to Document

10.1016/j.jpowsour.2004.12.021

Cite this

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title = "Study of the electrochemical properties of Ga-doped LiNi 0.8Co0.2O2 synthesized by a sol-gel method",

abstract = "The effects of gallium doping on the structure and electrochemical properties of LiNi0.8Co0.2O2 were investigated by X-ray diffraction, cyclic voltammetry and charge-discharge tests. LiNi 0.8Co0.2-xGaxO2 (x = 0.01, 0.03, 0.05) was synthesized using a sol-gel method and it showed the average particle size less than 1 μm in diameter. Results showed that gallium-doping had no effect on the crystal structure (α-NaFeO2) of the cathode material in the range x ≤ 0.05. On the other hand, two transitions at 3.7-3.9 and 4.2-4.7 V observed during the cycle test were merged into one when the amount of gallium doping increases to 0.05, implying that the enhanced capacity retention with gallium doping is attributed to the suppression of the phase transition of the cathode. However, the increase of gallium content in LiNi 0.8Co0.2O2 slightly decreases the initial discharge capacity.",

keywords = "Cathode, LiNiCoGa O, Phase transition, Sol-gel method",

author = "Han, {Chang Joo} and Eom, {Won Sob} and Lee, {Sang Myoung} and Cho, {Won Il} and Ho Jang",

note = "Funding Information: The research was performed with financial support from the Center for Nanostructure Materials Technology under {\textquoteleft}21st century Frontier R&D Programs{\textquoteright} of the Ministry of Science and Technology, Korea.",

year = "2005",

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T1 - Study of the electrochemical properties of Ga-doped LiNi 0.8Co0.2O2 synthesized by a sol-gel method

AU - Han, Chang Joo

AU - Eom, Won Sob

AU - Lee, Sang Myoung

AU - Cho, Won Il

AU - Jang, Ho

N1 - Funding Information: The research was performed with financial support from the Center for Nanostructure Materials Technology under ‘21st century Frontier R&D Programs’ of the Ministry of Science and Technology, Korea.

PY - 2005/6/1

Y1 - 2005/6/1

N2 - The effects of gallium doping on the structure and electrochemical properties of LiNi0.8Co0.2O2 were investigated by X-ray diffraction, cyclic voltammetry and charge-discharge tests. LiNi 0.8Co0.2-xGaxO2 (x = 0.01, 0.03, 0.05) was synthesized using a sol-gel method and it showed the average particle size less than 1 μm in diameter. Results showed that gallium-doping had no effect on the crystal structure (α-NaFeO2) of the cathode material in the range x ≤ 0.05. On the other hand, two transitions at 3.7-3.9 and 4.2-4.7 V observed during the cycle test were merged into one when the amount of gallium doping increases to 0.05, implying that the enhanced capacity retention with gallium doping is attributed to the suppression of the phase transition of the cathode. However, the increase of gallium content in LiNi 0.8Co0.2O2 slightly decreases the initial discharge capacity.

AB - The effects of gallium doping on the structure and electrochemical properties of LiNi0.8Co0.2O2 were investigated by X-ray diffraction, cyclic voltammetry and charge-discharge tests. LiNi 0.8Co0.2-xGaxO2 (x = 0.01, 0.03, 0.05) was synthesized using a sol-gel method and it showed the average particle size less than 1 μm in diameter. Results showed that gallium-doping had no effect on the crystal structure (α-NaFeO2) of the cathode material in the range x ≤ 0.05. On the other hand, two transitions at 3.7-3.9 and 4.2-4.7 V observed during the cycle test were merged into one when the amount of gallium doping increases to 0.05, implying that the enhanced capacity retention with gallium doping is attributed to the suppression of the phase transition of the cathode. However, the increase of gallium content in LiNi 0.8Co0.2O2 slightly decreases the initial discharge capacity.

KW - Cathode

KW - LiNiCoGa O

KW - Phase transition

KW - Sol-gel method

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