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Rational Design of a Composite Electrode to Realize a High‐Performance All‐Solid‐State Battery
Author(s) -
Kim KyungSu,
Park Jesik,
Jeong Goojin,
Yu JiSang,
Kim YongChan,
Park MinSik,
Cho Woosuk,
Kanno Ryoji
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201900010
Subject(s) - electrolyte , composite number , electrode , materials science , fast ion conductor , battery (electricity) , chemical engineering , conductivity , ionic liquid , ionic conductivity , lithium (medication) , composite material , chemistry , organic chemistry , catalysis , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
A potential solid electrolyte for realizing all‐solid‐state battery (ASB) technology has been discovered in the form of Li 10 GeP 2 S 12 (LGPS), a lithium superionic conductor with a high ionic conductivity (≈12 mS cm −1 ). Unfortunately, the achievable Li + conductivity of LGPS is limited in a sheet‐type composite electrode owing to the porosity of this electrode structure. For the practical implementation of LGPS, it is crucial to control the pore structures of the composite electrode, as well as the interfaces between the active materials and solid‐ electrolyte particles. Herein, the addition of an ionic liquid, N ‐methyl‐ N ‐butylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([Py 14 ][TFSI]), is proposed as a pore filler for constructing a highly reliable electrode structure using LGPS. [Py 14 ][TFSI] is coated onto the surface of LGPS powder through a wet process and a sheet‐type composite electrode is prepared using a conventional casting procedure. The [Py 14 ][TFSI]‐embedded composite electrode exhibits significantly improved reversible capacity and power characteristics. It is suggested that pore‐filling with [Py 14 ][TFSI] is effective for increasing contact areas and building robust interfaces between the active materials and solid‐electrolyte particles, leading to the generation of additional Li + pathways in the composite electrode of ASBs.