Insights into the sodium storage mechanism of Bi₂Te₃ nanosheets as superior anodes for sodium-ion batteries

Abstract

Although bismuth-based anode materials for sodium-ion batteries (SIBs) are widely attracted, however, the large volume variation hinders the actual applications, especially in the Bi2Te3 system. In this study, the Bi2Te3...

Proton Irradiation Effects on the Pyroelectric Properties of P‐Type Bismuth Antimonide/Poly(vinylidene fluoride–trifluoroethylene) Composite Films

“…[49] The specific thermal capacities of P-Bi 2 Te 3 and P(VDF-TrFE) are 154 J kg −1 K −1 and 1170 J kg −1 K −1 , respectively. [50,51] The bulk thermal capacity of each composite film was obtained by calculating a weighted average according to the mass ratio of P-Bi 2 Te 3 and P(VDF-TrFE), with results shown in Figure 2a. The bulk thermal capacity is lower for composite films with higher P-Bi 2 Te 3 content.…”

Bismuth Telluride Nanoplates Hierarchically Confined by Graphene and N‐Doped C as Conversion‐Alloying Anode Materials for Potassium‐Ion Batteries

“…Since XPS can only measure the chemical state of element within a few nanometers depth, there are strong Bi─O and Te─O peaks for Bi 2 Te 3 @rGO and Bi 2 Te 3 @rGO@NC composites, which is due to the surface oxidation induced by the introduction of carbon. [28][29][30][31][32][33][34][35][36][37][38][39] High-resolution C 1s spectra can be fitted into three peaks of C─C/C═C, C─N/C─O, and C═O bonds with the binding energy of 284.8, 285.5, and 288.0 eV in Figure 2i. [29,15] Figure 2j presents the O 1s spectra for Bi 2 Te 3 @rGO@NC and Bi 2 Te 3 @rGO, in which the three fitting peaks at 530.3, 531.5, and 533.3 eV are assigned to Bi─O, Bi─O─C, and C─O─C, respectively.…”

“…In the first five scans, the shape of the redox peaks is similar, which shows excellent electrochemical reversibility and stability. [41] In the cathodic and anodic scans after the initial discharge process, the stable reduction and oxidation peaks at 1.09/1.80 V and 0.72/1.28 V correspond to the conversion reaction between Bi 2 Te 3 and Bi/K 2 Te, and the peaks at 0.11/0.63 V are ascribed to the alloying/dealloying process be-tween Bi and K. [28,42] The corresponding redox platforms can be observed in the charge-discharge curves in Figure 3b. By comparison, Bi 2 Te 3 @rGO (Figure S6, Supporting Information) and bare Bi 2 Te 3 (Figure S7, Supporting Information) exhibit weak or evanescent redox peaks, which highlights the high electrochemical reversibility of Bi 2 Te 3 @rGO@NC.…”

Theoretical prediction and characterization of novel two-dimensional ternary tetradymite compounds La2X2Y (X = I, Br, Cl; Y = Ge, Te) as anode materials for metal-ion batteries

“…Very recently, Pang et al synthesized ultrathin nanosheets of Bi 2 Te 3 and reported that the 2D nature of this unique structure promoted the electrochemical properties by achieving an outstanding rate and long cycling performance. 22 Despite these advantages, capacity fading is a serious problem in these materials, which is mainly attributed to the volume expansion during the lithiation/delithiation process. Thus, exploring new suitable electrode materials with desirable properties is currently an urgent task for the future development of metal-ion batteries.…”

“…(a) and (b) top view, (d) and (e) side view. (c) and (f) depicts the comparison of the theoretical specific capacities of 2D anode materials for LIBs and SIBs 15,22,[48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65].…”