Effect of preparation methods of LiNi{sub 1{minus}x}Co{sub x}O{sub 2} cathode materials on their chemical structure and electrode performance
The authors have studied effects of different starting materials on preparation of LiNi{sub 1{minus}x}Co{sub x}O{sub 2} cathode material for a Li-ion cell where x = 0.1, 0.2, and 0.3, and the electrochemical properties of resulting compounds from two different preparation methods. A preparation method (method B) which uses spherical powder of Ni{sub 1{minus}x}Co{sub x}(OH){sub 2} as one of the starting material produced a much superior cathode material than the other method (method A) which uses Ni(OH){sub 2} and Co(OH){sub 2}. Method A produced compounds with relatively high degrees of cation mixing which reduces electrochemical utilization (discharge capacity), increases irreversible capacity, and reduces stability on cycling of the cathode material. Method B, in contrast, produced cathode material with a much reduced degree of cation-mixing, thus improving the electrochemical properties. The spherical particle of material prepared by method B has the additional advantage of improved packing density of the electrode with improved volumetric energy density. The ratio of c/a was increased and the electrochemical stability on cycling of the material was improved as the content of Co (value of x) is increased.
- Research Organization:
- Samsung Display Devices Co., Chonan City (KR)
- OSTI ID:
- 20001065
- Journal Information:
- Journal of the Electrochemical Society, Vol. 146, Issue 10; Other Information: PBD: Oct 1999; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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