Particle size effect of Li[Ni0.5Mn0.5]O-2 prepared by co-precipitation
- Authors
- Lee, Kwang Seop; Myung, Seung-Taek; Moon, J. S. Myung; Sun, Yang Kook
- Issue Date
- Aug-2008
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- co-precipitation; hydroxide; LiNi0.5Mn0.5O2; positive electrode; lithium; battery
- Citation
- ELECTROCHIMICA ACTA, v.53, no.20, pp.6033 - 6037
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 53
- Number
- 20
- Start Page
- 6033
- End Page
- 6037
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/171929
- DOI
- 10.1016/j.electacta.2008.02.106
- ISSN
- 0013-4686
- Abstract
- Spherical (Ni0.5Mn0.5)(OH)(2) with different secondary particle size (3 mu m, 10 mu m in diameter) was synthesized by co-precipitation method. Mixture of the prepared hydroxide and lithium hydroxide was calcined at 950 degrees C for 20 h in air. X-ray diffraction patterns revealed that the prepared material had a typical layered structure with R (3) over barm space group. Spherical morphologies with mono-dispersed powders were observed by scanning electron microscopy. It was found that the layered Li[Ni0.5Mn0.5]O-2 delivered an initial discharge capacity of 148 mAh g(-1) (3.0-4.3 V)though the particle sizes were different. Li[Ni0.5Mn0.5]O-2 having smaller particle size (3 mu m) showed improved area specific impedance due to the reduced Li+ diffusion path, compared with that of Li[Ni0.5Mn0.5]O-2 possessing larger particle size (10 mu m). Although the Li[Ni0.5Mn0.5]O-2 (3 mu m) was electrochemically delithiated to Li-0.39[Ni0.5Mn0.5]O-2, the resulting exother. mic onset temperature was around 295 degrees C, of which the value is significantly higher than that of highly delithiated Li1-delta CoO2 (similar to 180 degrees C).
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