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| Type |
Poster Presentation |
| Area |
Environmental Energy |
| Room No. |
Exhibition Hall 2+3 |
| Time |
10월 19일 (목요일) 11:00~12:30 |
| Code |
ENVR.P-506 |
| Subject |
Structural Stability of LiNiO2 Cycled above 4.2 V |
| Authors |
Un-Hyuck Kim
Hanyang University, Korea |
| Abstract |
The spherical stoichiometric LNO particle, which was composed of compactly packed was prepared by lithiation of the Ni(OH)2 precursor and cycled at different cutoff voltages(4.1, 4.2, and 4.3V). It was demonstrated that the Li+ ion intercalation stability can be greatly improved through suppression of the H2 → H3 phase transition at 4.15 V during charging by limiting the upper cutoff voltage to 4.1 V. Structural damage incurred by repeated H2 → H3 phase transition was shown by TEM analysis and correlated well with the electrochemical data. Above 4.1 V, the LNO cathode was susceptible to structural damage due to microcracking due to the H2 → H3 phase transition, which led to rapid capacity fading, whereas by avoiding the H2 → H3 phase transition below 4.1 V, the cycling stability was markedly improved.
As the composition of the newly developed NCM cathodes is edging toward increasingly Ni-rich compositions, the detrimental phase transition at high voltages needs be closely addressed to ensure long-term life of the NCM cathode-based battery.
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| E-mail |
djkasa2@gmail.com |
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120th General Meeting of the KCS