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Updated: May 23, 2026
Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
Functional CNTs@EMIM+ -Br- Electrode Enabling Polysulfides Confining and Deposition Regulating for Solid-State
Wei Li1, Pengfei Wang2,3, Menghang Zhang1
1Center of Energy Storage Materials & Technology, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid-State Microstructures and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China.
This study introduces a novel cathode for solid-state lithium-sulfur (Li-S) batteries using modified carbon nanotubes. The new material significantly improves cycling performance and capacity retention, addressing key limitations in Li-S battery technology.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Poly(ethylene oxide) (PEO)-based solid-state lithium-sulfur (Li-S) batteries offer high theoretical energy density but suffer from polysulfide shuttling and electrode passivation.
- These issues severely limit the long-term cycling performance and practical application of Li-S batteries.
Purpose of the Study:
- To develop a novel cathode material for PEO-based Li-S batteries that overcomes polysulfide shuttling and electrode passivation.
- To enhance the electrochemical kinetics and long-term cycling stability of solid-state Li-S batteries.
Main Methods:
- Chemically grafting 1-Ethyl-3-methylimidazolium bromide (EMIM+–Br–) to carbon nanotubes (CNTs) to create a CNTs@EMIM-Br/S cathode.
- Investigating the dual function of EMIM+–Br– as a mediator to inhibit polysulfide shuttling and facilitate Li2S formation.
Main Results:
- The CNTs@EMIM-Br/S cathode demonstrated high sulfur utilization with a capacity of up to 1298 mAh g−1.
- Achieved high capacity retention of 80.2% at 0.2 C after 350 cycles, outperforming many reported PEO-based solid-state Li-S batteries.
Conclusions:
- The developed dual-function cathode effectively suppresses polysulfide shuttling and improves Li2S formation, leading to enhanced battery performance.
- This work presents a promising strategy for designing advanced cathode architectures for practical Li-S battery applications.
