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Open AccessArticle

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

1
Electrochemistry Division, IMDEA Materials Institute, 28906 Madrid, Spain
2
Faculty of Science, Universidad Autónoma de Madrid, 28049 Madrid, Spain
*
Author to whom correspondence should be addressed.
Batteries 2021, 7(1), 1; https://doi.org/10.3390/batteries7010001
Received: 20 November 2020 / Revised: 14 December 2020 / Accepted: 21 December 2020 / Published: 24 December 2020
(This article belongs to the Special Issue Battery Systems and Energy Storage beyond 2020)
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. View Full-Text
Keywords: electrolyte; additive; interface; pseudocapacitance; intercalation; energy storage; secondary battery; sodium-ion electrolyte; additive; interface; pseudocapacitance; intercalation; energy storage; secondary battery; sodium-ion
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MDPI and ACS Style

Maça, R.R.; Etacheri, V. Effect of Vinylene Carbonate Electrolyte Additive on the Surface Chemistry and Pseudocapacitive Sodium-Ion Storage of TiO2 Nanosheet Anodes. Batteries 2021, 7, 1. https://doi.org/10.3390/batteries7010001

AMA Style

Maça RR, Etacheri V. Effect of Vinylene Carbonate Electrolyte Additive on the Surface Chemistry and Pseudocapacitive Sodium-Ion Storage of TiO2 Nanosheet Anodes. Batteries. 2021; 7(1):1. https://doi.org/10.3390/batteries7010001

Chicago/Turabian Style

Maça, Rudi R.; Etacheri, Vinodkumar. 2021. "Effect of Vinylene Carbonate Electrolyte Additive on the Surface Chemistry and Pseudocapacitive Sodium-Ion Storage of TiO2 Nanosheet Anodes" Batteries 7, no. 1: 1. https://doi.org/10.3390/batteries7010001

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