Boosting the Electrochemical Performance of Lithium‐Rich Cathodes by Oxygen Vacancy Engineering
نویسندگان
چکیده
The challenges of voltage decay and irreversible oxygen release for lithium-rich layered oxide cathode materials have hindered their commercial application despite high energy density low cost. Herein, a facile post-annealing strategy is developed to pre-introduce vacancies (OVs) into Li1.2Mn0.457Ni0.229Co0.114O2 materials. induced OVs modify the local Mn coordination environments, enhance structural stability, suppress release. modified exhibits discharge capacity 224.1 mAh g−1 at 0.1 C after 100 cycles with 97.7 % retention. Even 2 C, excellent retention 93.3 300 can be achieved. In situ ex X-ray diffraction are used elucidate reaction mechanisms crystal structure during cycling tests. Ex photoelectron spectroscopy confirmed suppressed release, enhanced reduced cathode-electrolyte interfacial layer post-annealed cathode. Our results show that presence through thermal expansion diminishes phase transitions in heating process. These findings contribute developing next-generation Li-ion batteries (LIBs) by vacancy engineering new improved electrochemical performances.
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ژورنال
عنوان ژورنال: Batteries & supercaps
سال: 2023
ISSN: ['2566-6223']
DOI: https://doi.org/10.1002/batt.202300123