Journal
RSC ADVANCES
Volume 6, Issue 72, Pages 67514-67519Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra10155k
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Funding
- Core Research for Evolution Science and Technology
- Super Cluster Program from Japan Science and Technology Agency
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In this study, we propose coating the surface of LiNi1/3Co1/3Mn1/3O2 (NCM) electrodes with 1.1 nm Nb2O5 nanosheets as a new way for enhancing their high-voltage capabilities in galvanostatic charge-discharge performances and long-term storage of the charged state at 60 degrees C. The coatings suppress the oxidative decomposition of the electrolyte and the disordering of the layered structures on the NCM surface, which result in impedance growth. After 100 cycles at voltage ranges 4.6-2.8 V at 1 C rate, more than 70% of the initial discharge capacity was retained in the coated electrodes. In comparison, the discharge capacity completely faded in the bare NCM cathode. Furthermore, the nanosheet coatings stabilize the delithiated NCM lattice charged at 4.6 V and inhibit current generation based on the electrode reactions at 60 degrees C for 300 h.
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