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A Two‐Dimensional Mesoporous Polypyrrole–Graphene Oxide Heterostructure as a Dual‐Functional Ion Redistributor for Dendrite‐Free Lithium Metal Anodes
Author(s) -
Shi Haodong,
Qin Jieqiong,
Huang Kai,
Lu Pengfei,
Zhang Chuanfang John,
Dong Yanfeng,
Ye Mao,
Liu Zhongmin,
Wu ZhongShuai
Publication year - 2020
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.202004284
Subject(s) - materials science , graphene , anode , lithium (medication) , mesoporous material , heterojunction , oxide , overpotential , nanotechnology , current density , dendrite (mathematics) , chemical engineering , electrochemistry , optoelectronics , electrode , chemistry , catalysis , medicine , biochemistry , physics , geometry , mathematics , quantum mechanics , endocrinology , engineering , metallurgy
Guiding the lithium ion (Li‐ion) transport for homogeneous, dispersive distribution is crucial for dendrite‐free Li anodes with high current density and long‐term cyclability, but remains challenging for the unavailable well‐designed nanostructures. Herein, we propose a two‐dimensional (2D) heterostructure composed of defective graphene oxide (GO) clipped on mesoporous polypyrrole (mPPy) as a dual‐functional Li‐ion redistributor to regulate the stepwise Li‐ion distribution and Li deposition for extremely stable, dendrite‐free Li anodes. Owing to the synergy between the Li‐ion transport nanochannels of mPPy and the Li‐ion nanosieves of defective GO, the 2D mPPy‐GO heterostructure achieves ultralong cycling stability (1000 cycles), even tests at 0 and 50 °C, and an ultralow overpotential of 70 mV at a high current density of 10.0 mA cm −2 , outperforming most reported Li anodes. Furthermore, mPPy‐GO‐Li/LiCoO 2 full batteries demonstrate remarkably enhanced performance with a capacity retention of >90 % after 450 cycles. Therefore, this work opens many opportunities for creating 2D heterostructures for high‐energy‐density Li metal batteries.