Journal
ENERGY STORAGE MATERIALS
Volume 35, Issue -, Pages 388-399Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2020.11.034
Keywords
Lithium ion batteries; Li-rich layered oxide cathodes; Energy efficiency; Oxygen redox
Funding
- National Key Research and Development Program of China [2016YFB0100100]
- National Natural Science Foundation of China [21703271, 21773279]
- Natural Science Foundation of Ningbo [202003N4030]
- S&T Innovation 2025 Major Special Programme of Ningbo [2018B10081]
- UCAS Joint PhD Training Program of China [UCAS[2015]37]
- DOE Office of Science [DE-SC0012704]
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This study focuses on the rational design of an energy-efficient Li-rich layered cathode with high energy, power density and cycling stability by tuning oxygen redox activity. The target material Li1.12Ni0.22Co0.13Mn0.52O2 shows ultra-high energy efficiency (90.6%) at 1C, high capacity (>200 mAh g(-1)) with 98.9% retention, and less than 150 mV of decay after 200 cycles. The compositional change greatly improves the oxygen redox kinetics and reversibility, leading to enhanced energy efficiency and narrowing the gap between scientific interest and practical application in oxygen-redox chemistry.
In developing electrode materials for next-generation Li-ion batteries, significant efforts have been given to the energy, power density and cycling stability, with much less (if any) attention paid to the energy efficiency - arguably, the most important practical measure for large-scale applications. This is particularly true for the oxygen-redox active electrodes, such as Li1.2Ni0.13Co0.13Mn0.54O2, the notorious energy-inefficient cathode that has an extremely high capacity but comes with large voltage hysteresis and voltage decay. Herein, we report the rational design of an energy-efficient Li-rich layered cathode along with high energy, power density and cycling stability enabled by tuning oxygen redox activity. Specifically, the target material Li1.12Ni0.22Co0.13Mn0.52O2 exhibits an ultrahigh energy efficiency at 1 C (90.6%), high capacity (> 200 mAh g(-1)) with 98.9% retention and less than 150 mV decay at the extended 200 cycles. Through direct comparison between the material and Li1.2Ni0.13Co0.13Mn0.54O2, we show that the compositional change, although slightly, greatly improves the oxygen redox kinetics and reversibility, thereby boosts energy efficiency. The findings offer a strategy to narrow the gap between scientific interest and practical application of oxygen-redox chemistry.
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