Ultrastable Orthorhombic Na₂TiSiO₅ Anode for Lithium‐Ion Battery

Abstract

Lithium‐ion batteries (LIBs) play an important role in the storage of electrical energy in modern society, and there is an urgent need to develop anode materials that can meet the ever‐increasing demand for high energy density. The use of titanosilicate anode materials in high‐performance LIBs has attracted great attention due to their proper potential between graphite and Li4Ti5O12. A novel anode material prepared by an electrospinning method, orthorhombic Na2TiSiO5 (O‐NTSO) shows excellent cycle stability (capacity retention after 1000 cycles is 97.8%) and a usable reversible capacity (230 mAh g−1 at 50 mA g−1) with a safe average storage voltage of 0.8 V. The specific capacity of O‐NTSO is constituted by both capacitive and diffusion behavior. As a new member of the silicate anode materials, this orthorhombic Na2TiSiO5 has excellent electrochemical performance and is a promising LIB anode material with long cycle stability.

Rb4Li2TiOGe4O12: a novel high-performance titanyl germanate anode for Li-ion batteries

“…As shown in Fig. 3e, compared with graphite 27 and other titanyl-based anodes, 2,8–13 the RLTG anode material has balanced electrochemical performances with higher specific capacity and lower operating voltage, which indicates that the whole battery composed of the RLTG anode will have higher energy density. The good electrochemical performance of RLTG comes from three aspects.…”

“…6 With the vision of improving overall performance, polyanionic compounds such as titanyl silicate/germanate anode materials have shown enhanced electrochemical performances with reduced working potentials compared to that of pure titanylbased anode materials. Taking the A 2 TiMO 5 (A = Li, Na; M = Si, Ge) [7][8][9][10][11][12][13] family as an example, this family of crystals exhibits an obvious layered structure, which consists of {TiO[MO 4 ]} N layers alternating with Li + or Na + cation layers. Li 2 TiSiO 5 delivers a specic capacity of 308 mA h g −1 and works below 1 V with a discharge voltage plateau of 0.28 V at 20 mA g −1 .…”

“…During discharge/charge, it undergoes both insertion and conversion reactions. 8 Na 2 TiSiO 5 presents a reversible capacity of about 320 mA h g −1 at 100 mA g −1 , and more than 84% of the capacity is below the working potential of 1 V. [10][11][12] Li 2 -TiGeO 5 possesses an encouraging reversible specic capacity of 691 mA h g −1 with a suitable working potential of 0.5 V at 20 mA g −1 . The compounds Li 2 O, Li-Ge alloy and TiO formed during the initial discharge process participate in the conversion reaction of subsequent charge/discharge cycles.…”

Defect Engineering of Hexagonal MAB Phase Ti2InB2 as Anode of Lithium‐Ion Battery with Excellent Cycling Stability

“…These values are comparable to diffusion barriers observed in other commonly used anodes for LIBs. [ 48 , 49 ] Additionally, significantly lower energy barriers of 0.027 and 0.018 eV were obtained for Li diffusion between neighboring In‐hol sites on the In‐terminated (001) surface and In‐top sites on the In‐terminated (010) surface of V In ‐Ti 2 InB 2 , respectively (Figure 4h ; Figure S30b , Supporting Information).…”

Thermodynamic Origin‐Based In Situ Electrochemical Construction of Reversible p‐n Heterojunctions for Optimal Stability in Potassium Ion Storage

“…Figure 6a presents an analysis of capacitive effect on CPS-h/G at these rates, with increased similarity in shape as scan rate grows, suggesting its outstanding electrochemical stability. [75] The relationship between peak current (i) and scan rate (v), described by Equation ( 14), indicates capacitive effect: a b-value of 0.5 reveals a diffusion-controlled process, while a b-value of 1.0 implies a capacitive-controlled process. Plotting log(i) against log(𝜈) helps calculate the b-value.…”