Journal
NANO ENERGY
Volume 65, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.103988
Keywords
High voltage cathode; Hybrid Li3PO4-TiO2 coating; Ionic and electronic conductivity; Side-reactions
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada
- General Motors R&D Center at Warren (GM)
- Canada Research Chair Program (CRC)
- Canada Foundation for Innovation (CFI)
- Canadian Light Source (CLS) at the University of Saskatchewan
- University of Western Ontario (UWO)
- Argonne National Laboratory
- US DOE, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office
- DOE Office of Science [DE-AC02-06CH11357]
- National Science Foundation [DMR-1620901]
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A stable and conductive interface is one of the decisive factors in manipulating the performance of high voltage LiNi0.5Mn1.5O4 (LNMO) cathode for Li-ion batteries. Herein, a hybrid Li3PO4-TiO2 coating layer is designed as an interfacial material via controllable atomic layer deposition (ALD) on LNMO. The coating acts not just as a physical barrier to prevent the side-reactions between cathode and electrolyte at high voltage, more importantly, the hybrid coating material improves both interfacial ionic and electronic conductivities to build facile Li-ion and electron diffusion pathways for LNMO. The optimized LNMO demonstrates improved rate capability and long-life stability. The capacity retention is 81.2% comparing with 47.4% of bare LNMO at 0.5C after 300 cycles. Detailed surface structural evolution is studied via X-ray absorption near edge spectroscopy and transmission electron microscopy. This work provides new insights of hybrid interfacial design via ALD and promotes novel electrode architectures for batteries.
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