Journal
ACS ENERGY LETTERS
Volume 6, Issue 2, Pages 789-798Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c00057
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Funding
- Brain Korea 21 PLUS Project for Center for Creative Industrial Materials [F14SN02D1707]
- POSTECH Basic Science Research Institute Grant
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2018M2A2B3A05074603, NRF-2019R1A2C2007933]
- National Research Foundation of Korea [2018M2A2B3A05074603] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A Co-free Mn-based Li-rich layered material with superior voltage retention for 490 cycles was reported in this study. The material was developed through a one-step solid-state reaction process, resulting in a robust layered structure and improved oxygen redox reversibility for long-term cycles.
Co-free Mn-based Li-rich layered materials have been attracting a lot of attention due to their high capacity via the additional oxygen redox reaction and their low cost. However, their poor capacity retention and voltage fade upon cycling remains a problem for practical applications. Herein, we report on long-term cyclability of a Co-free Mn-based Li-rich layered material with superior voltage retention for 490 cycles. The developed one-step solid-state reaction, which comprises a thorough mixing and a heating process at high temperature followed by a quenching process, can increase substantially the amount of Ni incorporated into the Li2MnO3 phase, and thereby the resulting material has a robust layered structure caused by the increase in the cation disordering, and a facile electron transfer for the oxygen redox reaction leading to the remarkably improved oxygen redox reversibility for long-term cycles. The findings will provide a new strategy for achieving high performance for long-term cycles in Li-rich layered materials.
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