Enhanced Anion-Derived Inorganic-Dominated Solid Electrolyte Interphases for High-Rate and Stable Sodium Storage

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外文摘要：It is highly desirable for the promising sodium storage possessing high rate and long stable capability,which are mainly hindered by the unstable yet conventional solvent-derived organic-rich solid electrolyte interphases.Herein,an electrolyte solvation chemistry is elaborately manipulated to produce an enhanced anion-derived and inorganic components-dominated solid electrolyte interphases by introducing a low permittivity(4.33)bis(2,2,2-trifluoroethyl)ether diluent into the sodium bis(trifluoromethylsulfonyl)imide-di methoxy ethane-based high concentration electrolyte to obtain a localized high concentration electrolyte.The bis(2,2,2-trifluoroethyl)ether breaks the balance of original cation solvation structure and tends to interact with Na+-coordinated dimethoxyethane solvent rather than Na+in high concentration electrolyte,leaving an enhanced Coulombic interaction between Na+and(FSO2)2N,and more(FSO2)2N-can enter the Na+solvation shell,forming a further increased number of Na+-(FSO2)2N--dimethoxyethane clusters(from 82.0％for high concentration electrolyte to 94.3％for localized high concentration electrolyte)at a low salt dosage.The preferential reduction of this(FSO2)2N--enriched clusters rather than the dimethoxyethane-dominated Na+solvation structure produces an enhanced anion-derived and inorganic components-dominated solid electrolyte interphases.The reversible charge storage process of Na is decoupled by operando Raman along with a shift of D and G peaks.Benefiting from the enhanced anion-derived electrode-electrolyte interface,the commercial hard carbon anode in localized high concentration electrolyte shows a well rate capability(5 A g-1,70 mAh g-1),cycle performance and stability(85％of initial capacity after 700 cycles)in comparison to that of high concentration electrolyte(68％)and low concentration electrolyte(only 5％after 400 cycles),indicative of uniqueness and superiorities towards stable Na storage.

外文关键词：

anion-derived inorganic-dominated SEIelectrolyte solvation chemistryhigh rate and stabilitysodium storage

作者：

Jinhe Yu、Weicheng Ren、Chang Yu、Zhao Wang、Yuanyang Xie、Jieshan Qiu

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作者单位：

State Key Lab of Fine Chemicals,School of Chemical Engineering,Liaoning Key Lab for Energy Materials and Chemical Engineering,Dalian University of Technology,Dalian 116024,China

State Key Lab of Chemical Resource Engineering,College of Chemical Engineering Beijing University of Chemical Technology,Beijing 100029,China

基金：

Innovation Program of Dalian City of Liaoning ProvinceNational Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)

项目编号：

2019RJ035187203522078052

出版年：

2023

DOI：

10.1002/eem2.12602

能源与环境材料(英文)

CSCD

ISSN：

年,卷(期)：2023.6(4)

参考文献量42