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A Desolvated Solid–Solid Interface for a High‐Capacitance Electric Double Layer
Author(s) -
Wang YuZuo,
Shan XuYi,
Ma LiPo,
Wang JiaWei,
Wang DaWei,
Peng ZhangQuan,
Cheng HuiMing,
Li Feng
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201803715
Subject(s) - materials science , capacitance , electrochemistry , solid solution , electrode , capacitor , supercapacitor , electric double layer capacitor , layer (electronics) , voltage , optoelectronics , nanotechnology , electrical engineering , chemistry , metallurgy , engineering
Understanding the electric double layer is essential for achieving efficient electrochemical energy storage technologies. A conventional solid–liquid electrode interface suffers from serious self‐discharge and a narrow voltage window, which makes the development of a solid–solid interface imperative. However, an in‐depth understanding of the electric double layer with a solid–solid interface is lacking. Here, a solid–solid interfacial electric double layer is proposed with excellent electrochemical performance. The solid layer is constructed by the electrochemical decomposition of lithium difluoro(oxalate)borate, which provides a desolvated environment for the establishment of a electric double layer. This makes a stronger interaction between the electrode surface and the ions. Based on this unique property, it is found that the solid–solid interfacial electric double layer has an increased capacitance, which suggests a way to develop high‐energy electrochemical capacitors.