Effect of Vinylene Carbonate Electrolyte Additive on the Surface Chemistry and Pseudocapacitive Sodium-Ion Storage of TiO2 Nanosheet Anodes

Abstract

Although titanium dioxide has gained much attention as a sodium-ion battery anode material, obtaining high specific capacity and cycling stability remains a challenge. Herein, we report significantly improved surface chemistry and pseudocapacitive Na-ion storage performance of TiO2 nanosheet anode in vinylene carbonate (VC)-containing electrolyte solution. In addition to the excellent pseudocapacitance (~87%), the TiO2 anodes also exhibited increased high-specific capacity (219 mAh/g), rate performance (40 mAh/g @ 1 A/g), coulombic efficiency (~100%), and cycling stability (~90% after 750 cycles). Spectroscopic and microscopic studies confirmed polycarbonate based solid electrolyte interface (SEI) formation in VC-containing electrolyte solution. The superior electrochemical performance of the TiO2 nanosheet anode in VC-containing electrolyte solution is credited to the improved pseudocapacitive Na-ion diffusion through the polycarbonate based SEI (coefficients of 1.65 × 10−14 for PC-VC vs. 6.42 × 10−16 for PC). This study emphasizes the crucial role of the electrolyte solution and electrode–electrolyte interfaces in the improved pseudocapacitive Na-ion storage performance of TiO2 anodes.

High‐Performance Mg−Li Hybrid Batteries Based on Pseudocapacitive Anatase Ti1‐xCoxO2‐y Nanosheet Cathodes

“…The sharp peak at 1.33 V can be attributed to the diffusion‐controlled process, and it disappeared at higher scan rates simultaneously with considerable increase in pseudocapacitance. Anodic/cathodic peaks of both systems exhibited a slightly different potentials for the second cycle due to the SEI formation [32] . Relative area and the intensity of CVs also experienced a reduction in the second cycle, representing irreversible capacity loss.…”

“…formation. [32] Relative area and the intensity of CVs also experienced a reduction in the second cycle, representing irreversible capacity loss. However, changes are more prominent in the case of anatase Ti 0.88 Co 0.12 O 2-δ nanosheets due to its increased redox activity.…”

Reduced Graphene Oxide Aerogels with Functionalization-Mediated Disordered Stacking for Sodium-Ion Batteries

“…Additional advantages for the development of the sodium-ion batteries are associated with the utilization of the infrastructure and technologies that were established for the commercialization of the lithium-ion batteries [19][20][21][22].…”

High Energy, Long Cycle, and Superior Low Temperature Performance Aqueous Na–Zn Hybrid Batteries Enabled by a Low-Cost and Protective Interphase Film-Forming Electrolyte

“…Scissoring vibrations for OCO 2 − from the same species appear at 877 cm −1 . 54 The peak at 1093 cm −1 assigned to C−O stretching transformation is derived from the organic species containing (−OCO 2 ) 2− functional groups and double bonds. Peaks that are obviously seen at 1398 cm −1 /1507 cm −1 in the spectra are the carbonate group of CO 3 2−…”