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Surface Engineering in Covalent Organic Polymers for High-Performance Li-S Batteries
Bing-Yi Lu1,2, Zhi-Peng Chen1, Hong-Rui Wang3
1Advanced Catalytic Engineer Research Center of the Ministry of Education College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 10, 2023
Summary
Surface engineering of covalent organic polymers (COPs) enhances lithium-sulfur (Li-S) battery performance. Increasing pore wall polarity in COPs effectively suppresses polysulfide shuttling, boosting energy storage capacity and longevity.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur (Li-S) batteries offer high theoretical energy density but are limited by polysulfide shuttling and active material loss.
- Developing effective cathode materials is crucial for overcoming these challenges and advancing Li-S battery technology.
Purpose of the Study:
- To investigate the impact of pore wall polarity in covalent organic polymers (COPs) on the performance of Li-S battery cathodes.
- To explore the synergistic effects of polarity, nano-confinement, and surface engineering in COP-based sulfur hosts.
Main Methods:
- Experimental synthesis and characterization of COP materials with tailored pore wall polarity.
- Electrochemical testing of COP-based cathodes in Li-S batteries.
- Theoretical calculations to elucidate the mechanisms of polysulfide interaction and confinement.
Main Results:
- Increased pore surface polarity in COPs significantly improved Li-S battery performance.
- A synergistic effect between polarized functionalities and nano-confinement within COPs was observed.
- Achieved outstanding Coulombic efficiency (99.0%) and minimal capacity decay (0.08% over 425 cycles at 1.0 C).
Conclusions:
- Surface engineering of COPs by enhancing pore wall polarity is a viable strategy for developing advanced Li-S batteries.
- Polarized COPs act as effective sulfur hosts, promoting high utilization of active materials and suppressing polysulfide shuttling.
- This study provides a design guideline for future high-performance cathode materials in Li-S energy storage systems.
