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High-Electrochemical-Activity Composite Cathode Enabled by Fast Segmental Relaxation for Solid-State Lithium-Sulfur
Yong An1, Qianchuan Yu2, Xiaoqin He1
1Science and Technology Department, Chongqing Vocational Institute of Engineering, Chongqing 402260, China.
ACS Applied Materials & Interfaces
|August 15, 2024
Summary
Researchers developed a novel hyperbranched ionic conducting polymer to overcome challenges in solid-state lithium-sulfur batteries (SSLSBs). This polymer enhances lithium polysulfide conversion, improving battery performance and stability for safer, high-energy applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Solid-state lithium-sulfur batteries (SSLSBs) offer high theoretical energy density and safety.
- Practical application is hindered by slow redox kinetics and poor cycling stability, often due to lithium polysulfide aggregation.
Purpose of the Study:
- To investigate the detrimental effect of lithium polysulfide aggregation on SSLSB performance.
- To develop a multifunctional polymer electrolyte and cathode binder to enhance SSLSBs.
Main Methods:
- Introduction of a hyperbranched ionic conducting (HIC) polymer as both a solid polymer electrolyte (SPE) and cathode binder.
- Electrochemical characterization of a Li|HIC SPE|HIC-S battery.
Main Results:
- The HIC polymer effectively dissociates lithium polysulfide clusters and accelerates conversion kinetics.
- The fabricated battery demonstrated high initial capacity (910.1 mA h gS-1), excellent cycling stability (73.7% retention over 200 cycles), and high Coulombic efficiency (~99.0%).
Conclusions:
- The HIC polymer's unique structure significantly improves the electrochemical activity and cycling stability of SSLSBs.
- This work provides valuable insights for designing advanced solid polymer electrolytes for high-performance and safe SSLSBs.
