New anatase phase VTi_2.6O_7.2 ultrafine nanocrystals for high-performance rechargeable magnesium-based batteries

Abstract

A new kind of VTi2.6O7.2 ultrafine nanocrystals is designed via constructing substitutional solid solution, and it exhibits improved Mg2+ and Li+ storage performances.

Spinel Li4Mn5O12 as 2.0 V Insertion Materials for Mg‐Based Hybrid Ion Batteries

“…It is similar to LIBs and operates by shuttling the Li ions between the electrodes. [20][21] Currently, a plenty of literatures have been reported on hybrid MgÀ Li batteries with different cathodes, such as TiS 2 (1.4 V, vs. Mg/ Mg 2 + ), [22] Li 4 Ti 5 O 12 (0.5 V, vs. Mg/Mg 2 + ), [19] LiCrTiO 4 (0.62 V, vs. Mg/Mg 2 + ), [23] FeS 2 (0.7 V, vs. Mg/Mg 2 + ), [24] MLi 2 Ti 6 O 14 (0.62 V, vs. Mg/Mg 2 + ). [25] Nevertheless, the limited electrochemical performance of these hybrid MgÀ Li batteries is not satisfactory.…”

“…The working principle of a hybrid Mg−Li batteries is shown in Figure a. It is similar to LIBs and operates by shuttling the Li ions between the electrodes . Currently, a plenty of literatures have been reported on hybrid Mg−Li batteries with different cathodes, such as TiS 2 (1.4 V, vs. Mg/Mg 2+ ), Li 4 Ti 5 O 12 (0.5 V, vs. Mg/Mg 2+ ), LiCrTiO 4 (0.62 V, vs. Mg/Mg 2+ ), FeS 2 (0.7 V, vs. Mg/Mg 2+ ), MLi 2 Ti 6 O 14 (0.62 V, vs. Mg/Mg 2+ ) .…”

Mg2+storage and mobility in anatase TiO2: the role of frustrated coordination

“…24,64 The isovalent substitution of V 4+ (r ¼ 0.58Å) for Ti 4+ by Sheng et al was not found to improve intercalation capacity for Mg in anatase, but instead offered improved pseudocapacitive storage. 22 In light of the current discussion, we speculate that the smaller size of V 4+ compared to Ti 4+ does not cause lattice expansion, and is unlikely to inhibit the distortions discussed above.…”

“…However the charge storage was predominantly of a faradaic pseudocapacitive type, rather than a diffusion-controlled intercalation mechanism. 22 The enhanced capacity reported by Koketsu et al suggests that there may be doping strategies that can make anatase a viable Mg battery cathode material. Conveniently, doped anatase has been studied as a Li-ion battery electrode material in previous experimental literature, and with improvements and changes in performance noted for a range of dopants including Ni, 23 Nb, 24,25 Sn, 26 Fe, 27 and Mo, 28 providing an indication of routes to explore.…”

Recent Progress and Challenges in the Optimization of Electrode Materials for Rechargeable Magnesium Batteries

“…[ 27–31 ] However, the divalent Mg 2+ ions exhibit sluggish kinetics which originates from the strong polarizing nature and results in low or even no capacity in most cathode materials established for Li‐storage. [ 32–35 ] Choosing Mo 6 S 8 as the cathode material is a breakthrough on the way to RMBs and it still surpasses many of cathodes even today, especially in cycling stability. The Chevrel phase (CP) compound was first introduced in LIB in 1985, and also demonstrated high mobility of various ions (Ni 2+ , Zn 2+ , and Mg 2+ ).…”