Han, CJ Yoon, JH Cho, W Jang, H 2024-01-21T06:31:18Z 2024-01-21T06:31:18Z 2021-09-04 2004-09-10 0378-7753 https://pubs.kist.re.kr/handle/201004/137233 Prospective positive-electrode (cathode) materials for a lithium secondary battery, viz., LiNi0.8Co0.2-xAlxO2 (x = 0.00, 0.01, 0.03, and 0.05), were synthesized using a sol-gel method and the structural and electrochemical properties are examined by means of X-ray diffraction, cyclic voltammetry, and charge-discharge tests. The LiNi0.8Co0.2-xAlxO2 maintains the alpha-NaFeO2-type layered structure regardless of the aluminium content in the range x less than or equal to 0.05. On the other hand, as the aluminium content is increased, the capacity retention of LiNi0.8Co0.2-xAlxO2 is improved while initial discharge capacity is slightly decreased. Results also show that the current peaks on the cyclic voltammograms are diminished and merged on aluminium, addition. This suggests that the improved cycle stability of LiNi0.8Co0.2-xAlxO2 is due to suppression of the phase transition. (C) 2004 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV LITHIUM SECONDARY BATTERIES X-RAY-DIFFRACTION CATHODE MATERIALS LICOO2 LINIO2 BEHAVIOR ALUMINUM CELLS R(3)OVER-BAR-M INTERCALATION Electrochemical properties of LiNi0.8Co0.2-xAlxO2 prepared by a sol-gel method Article 10.1016/j.jpowsour.2004.05.006 1 JOURNAL OF POWER SOURCES, v.136, no.1, pp.132 - 138 JOURNAL OF POWER SOURCES 136 1 132 138 scie scopus 000224010200017 2-s2.0-4344662648 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article LITHIUM SECONDARY BATTERIES X-RAY-DIFFRACTION CATHODE MATERIALS LICOO2 LINIO2 BEHAVIOR ALUMINUM CELLS R(3)OVER-BAR-M INTERCALATION lithium secondary battery positive electrode sol-gel method LiNi0.8Co0.2-xAlxO2 phase transition