Journal
FUNCTIONAL MATERIALS LETTERS
Volume 13, Issue 5, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S1793604720500277
Keywords
Cathode materials; Li-rich nickel manganese oxide materials; F-doped; fluorine sources
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Funding
- National Natural Science Foundation of China [51774150, 51974137]
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Li-rich nickel manganese oxide materials are promising cathode materials for their high theoretical capacity and cobalt-free property. However, the poor cycle and rate performance still hamper their commercial application. In this study, fluorine-doped Li1.2Ni0.2Mn0.6O2 (LNMO) materials have been prepared successfully with different fluorine sources. XRD results verified that the (003) and (104) peaks of F-doped samples slightly shift to the lower diffraction angle than bare LNMO, and the large lithium slab distance of F-doped samples is beneficial for the transport and diffusion of Li+. The sample with PVDF as fluorine sources exhibits the best electrochemical performance than other F-doped LNMO samples. Specifically, this sample exhibits a high discharge capacity of 213.5 mAh g(-1) at 0.2 C (2.0-4.8 V), corresponding to a capacity retention of 88.7% after 100 cycles. The excellent electrochemical performance is due to the substitution of fluorine for oxygen sites with the host lattice, which can significantly enhance the Li(+ )migration and stabilize the layer structure of LNMO during the cycle process. These results demonstrated that PVDF was the best fluorine source to facilitate the electrochemical property of LNMO.
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