Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 20, Pages 7778-7782Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202000628
Keywords
layered oxides; N-doped carbon nanolayers; oxygen vacancies; spinel phase; voltage decay
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Funding
- National Natural Science Foundation of China [51874104]
- Key Technology and Supporting Platform of Genetic Engineering of Materials under States Key Project of Research and Development Plan of China [2016YFB0700600]
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Voltage decay and capacity fading are the main challenges for the commercialization of Li-rich Mn-based layered oxides (LLOs). Now, a three-in-one surface treatment is designed via the pyrolysis of urea to improve the voltage and capacity stability of Li1.2Mn0.6Ni0.2O2 (LMNO), by which oxygen vacancies, spinel phase integration, and N-doped carbon nanolayers are synchronously built on the surface of LMNO microspheres. Oxygen vacancies and spinel phase integration suppress irreversible O-2 release and help lithium ion diffusion, while N-doped carbon nanolayer mitigates the corrosion of electrolyte with excellent conductivity. The electrochemical performance of LMNO after the treatment improves significantly; the capacity retention rate after 500 cycles at 1 C is still as high as 89.9 % with a very small voltage fading rate of 1.09 mV cycle(-1). This three-in-one surface treatment strategy can suppress the voltage decay and capacity fading of LLOs.
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