Evolution of the electrochemical interface in sodium ion batteries with ether electrolytes

Kaikai Li, Jun Zhang, Dongmei Lin, Da-Wei Wang, Baohua Li, Wei Lv, Sheng Sun, Yan-Bing He, Feiyu Kang, Quan-Hong Yang (), Limin Zhou () and Tong-Yi Zhang ()
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Kaikai Li: Tsinghua University
Jun Zhang: Tsinghua University
Dongmei Lin: The Hong Kong Polytechnic University
Da-Wei Wang: The University of New South Wales
Baohua Li: Tsinghua University
Wei Lv: Tsinghua University
Sheng Sun: Shanghai University
Yan-Bing He: Tsinghua University
Feiyu Kang: Tsinghua University
Quan-Hong Yang: Tsinghua University
Limin Zhou: The Hong Kong Polytechnic University
Tong-Yi Zhang: Shanghai University

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Ether based electrolytes have surfaced as alternatives to conventional carbonates allowing for enhanced electrochemical performance of sodium-ion batteries; however, the primary source of the improvement remains poorly understood. Here we show that coupling titanium dioxide and other anode materials with diglyme does enable higher efficiency and reversible capacity than those for the combination involving ester electrolytes. Importantly, the electrolyte dependent performance is revealed to be the result of the different structural evolution induced by a varied sodiation depth. A suit of characterizations show that the energy barrier to charge transfer at the interface between electrolyte and electrode is the factor that dominates the interfacial electrochemical characteristics and therefore the energy storage properties. Our study proposes a reliable parameter to assess the intricate sodiation dynamics in sodium-ion batteries and could guide the design of aprotic electrolytes for next generation rechargeable batteries.

Date: 2019
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DOI: 10.1038/s41467-019-08506-5

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