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The Electrical Double Layer

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

In Situ Constructing Robust Interface by Deep Eutectic Polymeric Electrolyte Enables High Performance Lithium Metal

Zixuan Fang¹, Ming Zhang¹, Zhihao Zhang¹

¹School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, Sichuan, 611731, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|October 28, 2024

Summary

A novel polymerizable deep eutectic electrolyte enhances lithium-ion transport and interface stability in Polyacrylonitrile (PAN)-based composite solid-state electrolytes (PCPE) for improved battery performance.

Keywords:

anchoring effect deep eutectic electrolytes high‐loading cathode lithium metal batteries solid state batteries

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Area of Science:

Materials Science
Electrochemistry
Polymer Science

Background:

Low lithium-ion (Li+) transport and poor interfacial stability hinder the practical application of Polyacrylonitrile (PAN)-based composite solid-state electrolytes (PCPE).
Addressing these limitations is crucial for developing advanced solid-state batteries.
Existing electrolytes often struggle with efficient ion conduction and maintaining integrity with high-loading electrodes.

Purpose of the Study:

To design and synthesize a polymerizable deep eutectic electrolyte with enhanced fluidity.
To improve Li+ transport and interfacial properties of PCPE.
To enable high-performance solid-state batteries with high-loading cathodes.

Main Methods:

A polymerizable deep eutectic electrolyte was formulated using Poly (Ethylene Glycol) Diacrylate (PEGDA), Fluoroethylene Carbonate (FEC), Succinonitrile (SN), and dual lithium salts (LiTFSI/LiDFOB).
The electrolyte was polymerized to form a 3D network structure.
Electrochemical performance, including conductivity and lithium stability, was evaluated.
LiCoO2 (LCO)/SP-PCPE/Li batteries with varying cathode loadings were assembled and cycled.

Main Results:

The modified PCPE exhibited an enhanced ionic conductivity of 4.47 × 10⁻⁴ S cm⁻¹ and a Li-ion transference number of 0.60.
The polymerizable electrolyte demonstrated excellent lithium metal stability.
LiCoO2 (LCO)/SP-PCPE/Li batteries operated effectively for over 300 cycles at 0.5 C with a cathode loading of 6 mg cm⁻².
Exceptional cycling performance was achieved even with an ultra-high cathode loading of 16 mg cm⁻².

Conclusions:

The developed polymerizable deep eutectic electrolyte effectively promotes Li+ transport and ameliorates the interface in PCPE.
The formation of a 3D polymeric network enhances electrode wettability and suppresses side reactions.
This approach offers a promising strategy for constructing robust interfaces in solid-state batteries, particularly for high-loading cathode applications.