Han, CJ Eom, WS Lee, SM Cho, WI Jang, H 2024-01-21T04:43:08Z 2024-01-21T04:43:08Z 2021-09-03 2005-06-01 0378-7753 https://pubs.kist.re.kr/handle/201004/136372 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. LiNi0.8Co0.2-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 mu m in diameter. Results showed that gallium-doping had no effect on the crystal structure (alpha-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 LiNi0.8Co0.2O2 slightly decreases the initial discharge capacity. (c) 2005 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV RECHARGEABLE LITHIUM BATTERIES X-RAY-DIFFRACTION CATHODE MATERIAL SECONDARY BATTERIES ION BATTERIES LICOO2 BEHAVIOR LINIO2 CELLS AL Study of the electrochemical properties of Ga-doped LiNi0.8Co0.2O2 synthesized by a sol-gel method Article 10.1016/j.jpowsour.2004.12.021 1 JOURNAL OF POWER SOURCES, v.144, no.1, pp.214 - 219 JOURNAL OF POWER SOURCES 144 1 214 219 scie scopus 000229705800028 2-s2.0-18844369899 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article RECHARGEABLE LITHIUM BATTERIES X-RAY-DIFFRACTION CATHODE MATERIAL SECONDARY BATTERIES ION BATTERIES LICOO2 BEHAVIOR LINIO2 CELLS AL cathode sol-gel method LiNi0.8Co0.2-xGaxO2 phase transition