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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Constructing multifunctional solid electrolyte interface via in-situ polymerization for dendrite-free and low N/P
Dan Luo1,2, Lei Zheng3, Zhen Zhang2
1Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering & International Academy of Optoelectronics at Zhaoqing, South China Normal University, Guangdong, 510006, China.
Nature Communications
|January 9, 2021
Summary
A new strategy uses electrolyte additives to create a stable solid electrolyte interface (SEI) for lithium metal batteries (LMBs). This improves lithium deposition, enabling dendrite-free anodes and enhanced battery performance.
Area of Science:
- Electrochemistry
- Materials Science
- Battery Technology
Background:
- Stable solid electrolyte interface (SEI) is crucial for lithium metal batteries (LMBs) to suppress electrolyte consumption and inhibit lithium dendrite growth.
- Current SEI strategies often result in non-uniform, inflexible films, hindering uniform lithium nucleation and leading to dendrite formation and poor cycling stability.
Purpose of the Study:
- To develop a novel strategy for constructing a stable, multifunctional SEI in LMBs.
- To improve lithium nucleation and growth orientation for dendrite-free lithium deposition.
- To enhance the overall cycling performance and lifespan of LMBs.
Main Methods:
- Employing electrolyte additives with catechol and acrylic groups.
- Constructing the SEI via in-situ anionic polymerization.
- Investigating the SEI's self-smoothing, robustness, and ability to influence Li adsorption and nucleation.
Main Results:
- A self-smoothing and robust multifunctional SEI was formed, promoting homogenized Li nanosphere formation.
- The isotropic nanosphere formation led to uniform Li deposition and a dendrite-free anode.
- Achieved remarkable cycling performance: 10 mA cm⁻² current density, >8500 hrs cycle life, 4.25 Ah cm⁻² cumulative capacity, and stable cycling at 60°C.
Conclusions:
- The facile strategy enables the construction of a stable, multifunctional SEI for dendrite-free lithium metal anodes.
- Demonstrated prolonged lifespan in various battery chemistries (Li-S, Li-LiFePO₄) under challenging conditions.
- This approach holds significant potential for the practical application of LMBs and SEI design in related fields.
