Ion Flux Self-Regulation Strategy with a Volume-Responsive Separator for Lithium Metal Batteries
Chuan Shi1, Lei Zhang1, Xiuting Wang1
1College of Physics, Qingdao University, 266071Qingdao, China.
ACS Applied Materials & Interfaces
|November 14, 2022
Summary
This study introduces a novel separator for lithium metal batteries (LMBs) that effectively suppresses lithium dendrite growth and accommodates volume changes, enhancing battery safety and longevity. The advanced separator promotes uniform interfaces, enabling 1000 hours of stable operation and improved thermal safety for next-generation energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium metal batteries (LMBs) offer high energy density but face challenges from lithium dendrite formation and volume changes during cycling.
- These issues hinder the commercialization of LMBs by compromising safety and cycle life.
Purpose of the Study:
- To design and evaluate a volume-responsive separator for LMBs that mitigates lithium dendrite growth and volume expansion.
- To enhance the stability and safety of lithium metal batteries through advanced separator technology.
Main Methods:
- Fabrication of a core/shell structured separator using thermoplastic polyurethane (TPU)/polyvinylidene fluoride (PVDF) fibers with SiO2 coating.
- Experimental characterization and ab initio molecular dynamic analysis to study separator performance and ion transport.
- Assembly and testing of Li symmetric cells using the developed TPU/PVDF-SiO2 separator.
Main Results:
- The TPU/PVDF-SiO2 separator effectively restricted lithium dendrite growth and accommodated electrode volume changes.
- Cells with the new separator maintained intimate electrode contact, promoting uniform solid-electrolyte interphase formation.
- Li symmetric cells demonstrated stable operation for 1000 hours at 1.0 mA cm-2, and the separator provided thermal shutdown at 170 °C.
Conclusions:
- The developed TPU/PVDF-SiO2 separator shows significant potential for advancing the commercial viability of lithium metal batteries.
- This innovative separator addresses key challenges in LMB technology, paving the way for safer and more durable energy storage solutions.
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