Solid‐Adsorbed Polymer‐Electrolyte Interphases for Stabilizing Metal Anodes in Aqueous Zn and Non‐Aqueous Li Batteries

Polymers are known to adsorb spontaneously from liquid solutions in contact with high‐energy substrates to form configurationally complex, but robust phases that often exhibit higher durability than might be expected from the individual physical bonds formed with the substrate. Rational control of t...

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Published in:Angewandte Chemie (International ed.) 2023-04, Vol.62 (18), p.e202300823-n/a
Main Authors: Jin, Shuo, Deng, Yue, Chen, Pengyu, Hong, Shifeng, Garcia‐Mendez, Regina, Sharma, Arpita, Utomo, Nyalaliska W., Shao, Yiqi, Yang, Rong, Archer, Lynden A.
Format: Article
Language:English
Subjects:
Adsorbed Polymer Interphases
Aqueous Zn Battery
Batteries
Conformation
Durability
Electrochemistry
Electrolytes
Energy resources
Energy storage
Li Metal Battery
Molecular weight
Polyethylene glycol
Polymer-Induced Organic/Inorganic SEI
Polymers
Substrates
Transport properties
Zinc
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Summary:Polymers are known to adsorb spontaneously from liquid solutions in contact with high‐energy substrates to form configurationally complex, but robust phases that often exhibit higher durability than might be expected from the individual physical bonds formed with the substrate. Rational control of the physical, chemical, and transport properties of such interphases has emerged as a fundamental opportunity for scientific and technological advances in energy storage technology but requires in‐depth understanding of the conformation states and electrochemical effect of the adsorbed polymers. Here, we analyze the interfacial adsorption of oligomeric polyethylene glycol (PEG) chains of moderate sizes dissolved in protic and aprotic liquid electrolytes and find that there is an optimum polymer molecular weight of approximately 400 Da at which the highest columbic efficiency is achieved for both Zn and Li deposition. These findings point to a simple, versatile approach for extending the lifetime of batteries. The optimized PEG adsorption interphases realize highly reversible Zn/Li anodes. The organic/inorganic SEI layer induced by the adsorbed PEG interphases plays a key role in the stability of the metal anode and the low N/P ratio full cells.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202300823