Structural transformation of Li[Ni0.5-xCo2xMn0.5-x]O-2 (2x <= 0.1) charged in high-voltage range (4.5 V)
- Authors
- Park, B.-C.; Bang, H. J.; Yoon, C. S.; Myung, S.-T.; Prakash, J.; Sun, Y.-K.
- Issue Date
- Jan-2007
- Publisher
- ELECTROCHEMICAL SOC INC
- Citation
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.154, no.6, pp.A520 - A526
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY
- Volume
- 154
- Number
- 6
- Start Page
- A520
- End Page
- A526
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/180577
- DOI
- 10.1149/1.2719627
- ISSN
- 0013-4651
- Abstract
- In order to evaluate the effect of Co on the structural stability of Li[Ni0.5-xCo2xMn0.5-x]O-2 (x <= 0.05), Co-doped Li[Ni0.5-xCo2xMn0.5-x]O-2 samples were synthesized by coprecipitation method. The structural instability, electrochemical properties, reactivity with electrolyte, and thermal stability of the Li[Ni0.5-xCo2xMn0.5-x]O-2 (x <= 0.05) were investigated. Co-substituted Li[Ni0.5-xCo2xMn0.5-x]O-2 (x = 0, 0.025, 0.05) showed increase of the specific discharge capacity and improved rate capability compared to Li[Ni0.5Mn0.5]O-2. However, X-ray diffraction study of Li[Ni0.5-xCo2xMn0.5-x]O-2 (charged at 4.5 V) showed that Co substitution increases the lattice parameter in the c axis dramatically, compared to the Co undoped electrode (Li[Ni0.5Mn0.5]O-2). Electron diffraction analysis confirmed that cobalt substitution induced significant structural transformation during cycling in the high-potential range (4.5 V). Furthermore, increase of Co amount in the Li[Ni0.5-xCo2xMn0.5-x]O-2 (x <= 0.05) accelerated Co dissolution at high-temperature storage. The shift of onset temperature of exothermic reaction on differential scanning calorimetric behaviors of the Co-substituted Li[Ni0.5-xCo2xMn0.5-x]O-2 (x = 0.025 and x = 0.05) was observed.
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