Electrochemical properties of yolk-shell structured layered-layered composite cathode powders prepared by spray pyrolysis
- Authors
- Kim, Jung Hyun; Kang, Yun Chan; Choi, Yun Ju; Kim, Yang Soo; Lee, Jong-Heun
- Issue Date
- 20-10월-2014
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Yolk-shell; Layered material; Cathode material; Lithium ion batteries; Spray pyrolysis
- Citation
- ELECTROCHIMICA ACTA, v.144, pp.288 - 294
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 144
- Start Page
- 288
- End Page
- 294
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/97076
- DOI
- 10.1016/j.electacta.2014.08.015
- ISSN
- 0013-4686
- Abstract
- Layered-layered yolk-shell powders with composition 0.6Li(Li1/3Mn2/3)O-2 center dot 0.4Li(Ni1/3Co1/3Mn1/3)O-2 are prepared by spray pyrolysis. Metal oxides-carbon composite powders are first formed as an intermediate product near the reactor entrance by drying and decomposition of droplets. Combustion, contraction, and recombustion processes of intermediate product produce yolk-shell-structured powders. The yolk-shell structure of the powders prepared directly by spray pyrolysis is maintained even after post-treatment at 800 degrees C; this treatment temperature yields the best electrochemical performance. The composition of the powders post-treated at 800 degrees C is Li1.12Ni0.14Co0.14Mn0.59O2. Mean grain sizes of the yolk-shell 0.6Li(Li1/3Mn2/3)O-2 center dot 0.4Li(Ni1/3Co1/3Mn1/3)O-2 powders, post-treated at 700, 750, and 800 degrees C, measured from high resolution TEM images, are 47, 54, and 79 nm, respectively, and their BET surface areas are 14, 9, and 7 m(2) g(-1). The initial discharge capacities of the powders, post-treated at the above temperatures, are 188, 280, and 239 mA h g(-1), respectively, and their initial Coulombic efficiencies are 87, 80, and 78%. Discharge capacities after 50 cycles of the post-treated powders are 81, 194, and 183 mA h g(-1), respectively, and the corresponding capacity retentions are 43, 70, and 77%. (C) 2014 Elsevier Ltd. All rights reserved.
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