| Autor: |
Yulong Liu, Haohan Wu, Kui Li, Hongyang Li, Ouyang, Dongxu, Arab, Phillip Peter, Phattharasupakun, Nutthaphon, Rathore, Divya, Johnson, Michel, Yiqiao Wang, Shuo Yin, Dahn, J. R. |
| Předmět: |
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| Zdroj: |
Journal of The Electrochemical Society; Sep2020, Vol. 167 Issue 12, p1-8, 8p |
| Abstrakt: |
Reduction of the Co content in Ni-rich positive electrode materials is an intense research area of great interest. Despite high specific capacity, Co-free Ni-rich materials normally suffer from poor cycling performance. In this work, a Co-free precursor with a 16 μm Ni(OH)2 core and 1 μm Ni0.8Mn0.2(OH)2 shell was reacted with LiOH . H2O at 750 °C (CS-750) or 800 °C (CS-800). CS-750 was found to retain the well-defined core-shell structure after heating, while CS-800 became homogeneous in composition due to Ni/ Mn interdiffusion at the higher temperature. Although both of materials exhibit higher specific capacity than LiNi0.8Mn0.1Co0.1O2 (NMC811) the charge-discharge capacity retention shows a dramatic difference. The cycling performance of CS-750 is equivalent to NMC811 samples, whereas CS-800 experiences significant capacity fade, suggesting the importance of a core-shell structure for Ni-rich materials with no Co. The electrical resistivity of CS-750 and CS-800 materials are comparable to NCA and are slightly lower than single crystal NMC811 suggesting that Co may not be essential to maintain good electrical properties. The authors believe CS-750 and related materials represent excellent Co-free options for high energy density Li-ion cells. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
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