Journal
MATERIALS TODAY ENERGY
Volume 27, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2022.101039
Keywords
Li-ions batteries; Li-rich Mn-based materials; Oxygen evolution; Li2MnO3-like domain
Funding
- Development Plan of Zhejiang Province [2022C01071]
- S&T Innovation 2025 Major Special Programme of Ningbo [2018B10081]
- National Natural Science Foundation of China [21773279]
- Youth Innovation Promotion Association of Chinese Academy of Sciences
- Natural Science Foundation of Ningbo [202003N4030, 202003N4347]
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In this study, a strategy to regulate the distribution of Li2MnO3-like domains in Li-rich layered cathodes is proposed to eliminate oxygen evolution. Experimental results demonstrate that dispersed Li2MnO3-like microstructures can withstand higher stress and result in a high specific energy density in the fabricated batteries.
Li-rich layered cathodes suffer from oxygen releasing with the undesired rapid performance decay at subsequent cycles. Herein, we propose a strategy on tuning the distribution of Li2MnO3-like domains to eliminate oxygen evolution. The distribution regulation is turned by the Li+ concentration in the early synthesizing stage, which is caused by the altered participation of Co3+ in the Li2MnO3-like configuration. The detailed local structural evolution is revealed by corresponding extended X-ray absorption fine structures. As calculated and simulated from synchrotron X-ray diffraction results and FAULTS program, the Li2MnO3-like domain can be well-dispersed in the lattice. No oxygen release with little carbon dioxide gas is detected by operando differential electrochemical mass spectrometry. The dispersed Li2MnO3-like microstructures can withstand more stress induced by structural distortion as confirmed by operando X-ray diffraction. The as-fabricated 10.5 Ah pouch cell with Li metal anode exhibits a specific energy density of 504 Wh kg-1 on the basis of cell mass. This work provides an effective approach to suppress oxygen releasing for high-energy-density lithium secondary batteries. (c) 2022 Elsevier Ltd. All rights reserved.
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