Graphite//LiNi_0.5Mn_1.5O₄ Cells Based on Environmentally Friendly Made-in-Water Electrodes

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• 作者：Dr. Francesca De Giorgio ; Dr. Nina Laszczynski ; Dr. Jan von Zamory ; Prof. Marina Mastragostino ; Prof. Catia Arbizzani and Prof. Stefano Passerini
• 刊名：ChemSusChem
• 出版年：2017
• 出版时间：January 20, 2017
• 年：2017
• 卷：10
• 期：2
• 页码：379-386
• 全文大小：1732K
• ISSN：1864-564X

文摘

The performance of graphite//LiNi_0.5Mn_1.5O₄ (LNMO) cells, both electrodes of which are made using water-soluble sodium carboxymethyl cellulose (CMC) binder, is reported for the first time. The full cell performed outstandingly over 400 cycles in the conventional electrolyte ethylene carbonate/dimethyl carbonate–1 m LiPF₆, and the delivered specific energy at the 100th, 200th, 300th, and 400th cycle corresponded to 82, 78, 73, and 66 %, respectively, of the initial energy value of 259 Wh kg^−1 (referring to the sum of the two electrode-composite weights). The good stability of high-voltage, LNMO–CMC-based electrodes upon long-term cycling is discussed and the results are compared to those of LNMO-composite electrodes with polyvinylidene fluoride (PVdF). LNMO–CMC electrodes outperformed those with PVdF binder, displaying a capacity retention of 83 % compared to 62 % for the PVdF-based electrodes after 400 cycles at 1 C. CMC promotes a more compact and stable electrode surface than PVdF; undesired interfacial reactions at high operating voltages are mitigated, and the thickness of the passivation layer on the LNMO surface is reduced, thereby enhancing its cycling stability.