Journal
CORROSION SCIENCE
Volume 168, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.108553
Keywords
LiNi0.8Co0.15Al0.05O2; Acid corrosion; Amorphous phosphate; Surface degradation; Lithium-ion battery
Funding
- National Natural Science Foundation of China (NSFC) [21805083, 21776068]
- State Scholarship Fund of China Scholarship Council [201808430295]
- Natural Science Foundation of Hunan Province [2018JJ3331]
- Science and Technology Planning Project of Hunan Province [2018TP1017]
- Opening Fund of Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research [KLCBTCMR201805]
- Collaborative Innovation Center of New Chemical Technologies for Environmental Benignity and Efficient Resource Utilization
- NSFC [51,728,202]
- project Nanotechnology Based Functional Solutions - Norte Portugal Regional Operational Programme (NORTE2020) under the PORTUGAL 2020 Partnership Agreement through the European Regional Development Fund (ERDF) [NORTE-01-0145-FEDER-000019]
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We report a surface modification of LiNi0.8Co0.15Al0.05O2 (NCA) materials with a phosphate layer via a room-temperature corrosion approach from H3PO4-ethanol solution. The phosphate layer is of amorphous nature with a thickness of 2 similar to 3 nm, and consequently, NCA maintains its bulk structure during cycling and possesses significantly enhanced rate property of 153.7 mA h g(-1) at 5C. Simultaneously, such a modified system demonstrates an excellent cycling stability (107.5 mA h g(-1)) and coulombic efficiency (> 90 %) after 300 cycles at 5C. The findings highlight that the acid corrosion treatment represents a facile and efficient way in developing advanced NCA cathodes.
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