期刊
CHEMISTRY OF MATERIALS
卷 34, 期 21, 页码 9711-9721出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.2c02519
关键词
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资金
- National Key Research and Development Program of China [2018YFB0905400, 2016YFB0901502]
- National Natural Science Foundation of China [21935009, 21761132030, 21973107]
- Shanghai Academic Research Leader [20XD1404100]
- Metrohm Foundation
- US DOE Office of Science (Office of Basic Energy Sciences) [DE-AC02-05CH11231]
- Advanced Battery Materials Research (BMR) program
- DRX project
- Assistant Secretary for Energy Efficiency and Renewable Energy, Vehicle Technologies Office (VTO) of the US DOE [DEAC02-05CH11231]
Li-rich rock-salt oxide LVTO with high capacity and low capacity decay is reported as a promising material for Li-ion batteries.
Li-rich oxide cathodes are drawing increasing attention as next-generation cathode materials for the development of high-energy-density Li-ion batteries due to their strikingly high capacities. However, transition-metal migration, irreversible structural phase transformations, and the irreversible release of oxygen are responsible for rapid capacity and voltage decay. This study reports a Li-rich cation-ordered rock-salt oxide LixV0.4Ti0.4O2 (LVTO, x = 0.97/1.2) with space group Fd (3) over barm that delivers a high capacity of over 250 mAh g(-1) and capacity retention up to 89% after 50 cycles. A comprehensive experimental analysis confirms that the capacity can be attributed to the reversible V3+/V5+ multielectron cationic redox reactions and a minor contribution from reversible anionic redox reactions. Importantly, LVTO exhibits nearly zero-strain behavior upon (dis)charge cycling cycles, which is associated with reversible V migration from octahedral to tetrahedral sites. Our results demonstrate that Li-rich rock-salt oxide LVTO could be a promising cobalt-free cathode material for Li-ion batteries.
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