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Double Ionic–Electronic Transfer Interface Layers for All‐Solid‐State Lithium Batteries
Author(s) -
Zheng Jingang,
Sun Chengguo,
Wang Zhenxing,
Liu Shaojun,
An Baigang,
Sun Zhenhua,
Li Feng
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202104183
Subject(s) - electrolyte , materials science , anode , ionic bonding , electrode , chemical engineering , cathode , oxide , polarization (electrochemistry) , ionic conductivity , chemistry , ion , organic chemistry , engineering , metallurgy
Large‐scale implementation of all‐solid‐state lithium batteries is impeded by the physical limitations of the interface between the electrode and solid electrolyte; specifically, high resistance and poor stability, as well as poor compatibility with Li + migration. We report double ionic–electronic transfer interface layers grown at electrode–electrolyte interfaces by in situ polymerization of 2,2′‐bithiophene in polyethylene oxide (PEO) electrolyte. For all‐solid‐state LiFePO 4 ∥PT‐PEO‐PT∥Li cells, the formation of a conductive polythiophene (PT) layer at the cathode–electrolyte interface resulted in an at least sevenfold decrease in interface resistance, and realized a capacity retention of about 94 % after 1000 cycles along with a lower polarization voltage under a rate of 2 C. The mixed ionic–electronic conductive layers imparted superior interface stability and contact while keeping good compatibility with the Li anode.