Electrochemical properties and thermal stability of Li{sub {alpha}}Ni{sub 1{minus}x}Co{sub x}O{sub 2} cathode materials
Conductive and electrochemical properties as well as thermal stability of Li{sub a}Ni{sub 1{minus}x}Co{sub x}O{sub 2} where x = 0--0.3 and a = 1.0--0.4 have been studied using impedance spectroscopy, galvanostatic intermittent titration technique, cyclic voltammetry, electrochemical cycling, and differential scanning calorimetry (DSC). The electronic conductivity of partially charged material (a {le} 0.8) increases substantially when the cobalt content is increased to x = 0.3 from 0.2. The mobility, chemical diffusion coefficient, and Li{sup +} ion diffusion coefficient in the partially charged material are in the neighborhood of 10{sup {minus}6}cm{sup {minus}2}/V x, 10{sup {minus}8}cm{sup 2}/s, and 5 x 10{sup {minus}10}cm{sup 2}/s, respectively, and are rather insensitive to the values of a and x. Results of electrochemical and DSC studies show that LiNi{sub 0.7}Co{sub 0.3}O{sub 2} is the best cathode material for a Li cell of all materials studied here in view of the best cycle stability, the smallest irreversible capacity, and the greatest thermal stability with minimal reduction of specific capacity from that of LiNiO{sub 2}.
- Research Organization:
- Samsung Display Devices Co., Chonan (KR)
- OSTI ID:
- 20014478
- Journal Information:
- Journal of the Electrochemical Society, Vol. 147, Issue 1; Other Information: PBD: Jan 2000; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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