ChemInform Abstract: Crystal Structure and Electrochemical Properties of A₂MPO₄F Fluorophosphates (A: Na, Li; M: Fe, Mn, Co, Ni).

Abstract

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Amorphous TiO2 Nanotube Anode for Rechargeable Sodium Ion Batteries

“…TiO 2 is one of a few transition-metal oxide materials that intercalates Li ions at reasonably low voltage (∼ 1.5 V vs Li/Li + ) with comparable capacities to the dominant graphite anodes. Although a variety of metal oxide materials have been identified as sodium-ion cathode materials, ,− there are very few materials reported to be suitable for anode materials. With the success of TiO 2 as anode materials for Li-ion batteries, , it is interesting to investigate its utilization for Na-ion batteries.…”

Microstructural Analysis of the Effects of Thermal Runaway on Li-Ion and Na-Ion Battery Electrodes

“…While failure rates of Li-ion batteries are estimated to be as low as one in 40 Â 10 6 , a number of high-profile incidents [4][5][6][7] have resulted in increased concern regarding LIB cell safety [8]. In addition to concerns over the safety of Li-ion cells, the relatively high cost of the cells [9] and potential volatility in Li supply chains [10] have led to increased interest in developing new battery chemistries. 1 Despite the now widespread use of Li-ion cells, recent work has seen an increased focus on developing and commercializing alternative battery types for a range of applications.…”

Electrochemical Performance of Chemically and Solid State-Derived Chevrel Phase Mo6T8 (T = S, Se) Positive Electrodes for Sodium-Ion Batteries

“…However, orthorhombic Na 0.44 MnO 2 ( Pbam symmetry), which consist of MnO 6 octahedra and MnO 5 square pyramids forming S-shape tunnels for Na-ion hopping, showed a constant biphasic phenomena during sodium-ion intercalation/deintercalation between 2 and 3.8 V, leading to very low specific capacity for practical use. ,,, Besides the oxides, the pyrophosphate family of compounds Na 2 MP 2 O 7 (M = Fe, Mn, Co etc. ), NASICON type compounds Na 3 M 2 (PO 4 ) 3 [M = transition metals], fluorophosphates NaVPO 4 F, Na 3 V 2 (PO 4 ) 2 F 3 , Na 2 FePO 4 F, Na 2 MnPO 4 F, and Na 2 (Fe,Mn)PO 4 F, and Prussian blue derivative compounds KMnFe(CN) 6 and Na x MnFe(CN) 6 − have also been explored as cathodes for sodium-ion batteries. However, most of the layered oxides, phosphates, and NASICON type compound exhibit irreversible phase transformation and sloping voltage plateaus; and the large difference in voltages during Na + intercalation/deintercalation phenomena precludes their use as cycle stable cathodes for Na-ion batteries.…”

“…21,23,29,30 Besides the oxides, the pyrophosphate family of compounds Na 2 MP 2 O 7 (M = Fe, Mn, Co etc. ), 31 NASICON type compounds Na 3 M 2 (PO 4 ) 3 [M = transition metals], fl uo ro ph osp h ates NaVPO 4 F, 3 2 Na 3 V 2 (PO 4 ) 2 F 3 , 3 3 Na 2 FePO 4 F, 34 Na 2 MnPO 4 F, 35 and Na 2 (Fe,Mn)PO 4 F, 36 and Prussian blue derivative compounds KMnFe(CN) 6 and Na x MnFe(CN) 6 37−39 have also been explored as cathodes for sodium-ion batteries. However, most of the layered oxides, phosphates, and NASICON type compound exhibit irreversible phase transformation and sloping voltage plateaus; and the large difference in voltages during Na + intercalation/deintercalation phenomena precludes their use as cycle stable cathodes for Na-ion batteries.…”