Recent Advances on F-Doped Layered Transition Metal Oxides for Sodium Ion Batteries

Abstract

With the development of social economy, using lithium-ion batteries in energy storage in industries such as large-scale electrochemical energy storage systems will cause lithium resources to no longer meet demand. As such, sodium ion batteries have become one of the effective alternatives to LIBs. Many attempts have been carried out by researchers to achieve this, among which F-doping is widely used to enhance the electrochemical performance of SIBs. In this paper, we reviewed several types of transition metal oxide cathode materials, and found their electrochemical properties were significantly improved by F-doping. Moreover, the modification mechanism of F-doping has also been summed up. Therefore, the application and commercialization of SIBs in the future is summarized in the ending of the review.

Origins of High Air Sensitivity and Treatment Strategies in O3-Type NaMn1/3 Fe1/3Ni1/3O2

“…14 For example, doping F on the NMFNO-(110) surface has been proven to inhibit both hydrolysis reactions and carbonate formation (Figure 8(a)). Experimental results demonstrate that F doping also enhances the structural stability of sodium-ion layered oxides, 35 which may contribute to prevent structural collapses and phase transitions caused by air sensitivity issues. However, our calculations show that the Na−F bonds (0.37 eV) are weaker than the Na−O bonds (0.60 eV), which may attenuate the thermal stability of surface Na; therefore, the practical effectiveness of this strategy remains to be verified.…”