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N-Vacancy Enriched Porous BN Fibers for Enhanced Polysulfides Adsorption and Conversion in High-Performance
Long Cheng1, Yang Huang1, Mehraj Ahmad1
1International Innovation Center for Forest Chemicals & Materials, Jiangsu Co-Innovation Center of Efficient Processing & Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 14, 2024
Summary
Defect-engineered boron nitride (BN) fibers effectively suppress polysulfide shuttle and boost reaction kinetics in lithium-sulfur batteries (LSBs). This leads to high capacity and exceptional cycling stability for advanced energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur batteries (LSBs) face challenges from polysulfide shuttle and slow redox kinetics.
- These issues limit LSBs' practical application and performance.
Purpose of the Study:
- To develop a novel material for LSBs that addresses polysulfide shuttle and sluggish kinetics.
- To enhance the electrochemical performance and cycle life of LSBs.
Main Methods:
- Synthesized one-dimensional boron nitride (1D BN) fibers with pores and N-vacancy defects.
- Incorporated S/Nv-BN@CBC cathode material.
- Investigated ion diffusion, polysulfide immobilization, and reaction kinetics.
Main Results:
- Achieved initial discharge capacity of 1347 mAh g⁻¹ at 200 mA g⁻¹.
- Demonstrated a low decay rate of 0.03% per cycle over 1000 cycles at 1600 mA g⁻¹.
- 1D BN structure facilitated ion diffusion and pore-embedded BN immobilized polysulfides.
Conclusions:
- Defect-engineered 1D BN fibers effectively mitigate the shuttle effect in LSBs.
- The N-vacancy sites on BN accelerate reaction kinetics, improving battery performance.
- This strategy shows significant potential for advancing LSB technology.
