Engineering Solid Electrolyte Interphase for Pseudocapacitive Anatase TiO2 Anodes in Sodium‐Ion Batteries

电解质 材料科学 锐钛矿 电化学 阳极 化学工程 相间 法拉第效率 无定形固体 电极 无机化学 催化作用 有机化学 光催化 化学 冶金 物理化学 生物 工程类 遗传学
作者
Zheng‐Long Xu,Kyungmi Lim,Kyu‐Young Park,Gabin Yoon,Won Mo Seong,Kisuk Kang
出处
期刊:Advanced Functional Materials [Wiley]
卷期号:28 (29) 被引量:120
标识
DOI:10.1002/adfm.201802099
摘要

Abstract Anatase TiO 2 is considered as one of the promising anodes for sodium‐ion batteries because of its large sodium storage capacities with potentially low cost. However, the precise reaction mechanisms and the interplay between surface properties and electrochemical performance are still not elucidated. Using multimethod analyses, it is herein demonstrated that the TiO 2 electrode undergoes amorphization during the first sodiation and the amorphous phase exhibits pseudocapacitive sodium storage behaviors in subsequent cycles. It is also shown that the pseudocapacitive sodium storage performance is sensitive to the nature of solid electrolyte interphase (SEI) layers. For the first time, it is found that ether‐based electrolytes enable the formation of thin (≈2.5 nm) and robust SEI layers, in contrast to the thick (≈10 nm) and growing SEI from conventional carbonate‐based electrolytes. First principle calculations suggest that the higher lowest unoccupied molecular orbital energies of ether solvents/ion complexes are responsible for the difference. TiO 2 electrodes in ether‐based electrolyte present an impressive capacity of 192 mAh g −1 at 0.1 A g −1 after 500 cycles, much higher than that in carbonate‐based electrolyte. This work offers the clarified picture of electrochemical sodiation mechanisms of anatase TiO 2 and guides on strategies about interfacial control for high performance anodes.
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