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Tuning Rational Micropore/Mesopores Network Structure of Biomass-Derived Carbon/Sulfur Cathode for High-Performance Na-S Batteries
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DOI：10.1002/eem2.70081.png)
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Abstract
En 中文
Sluggish electrode kinetics and polysulfide dissolution severely hinder room-temperature sodium-sulfur batteries (RT Na-S) from achieving high-theoretical capacity and low cost. Metal-based catalysts are often used to absorb polysulfide intermediates against the shuttle effect in Na-S batteries, but rationalization of an electrode pore structure to improve battery performance is ignored. Herein, a rational micropore/mesopore network structure of macadamia nut shell-derived carbon is constructed as a carbon/sulfur cathode by tuning the ratio of micro to mesopore. The cathode simultaneously boosts mass transport for high-rate performance while confining the shuttle effect for long cycles, thus delivering excellent Na-storage performance with high capacities of 912 mAh g−1 at 0.1 A g−1 and 360 mAh g−1 at 5 A g−1, ranking the best among all reported plain carbon-based sodium-sulfur electrodes. This work holds great promise for biomass-derived inexpensive plain carbon-based electrodes in practical high-rate applications, while shedding light on the fundamentals of pore structure effects of a carbon electrode on high-performance batteries, thus possessing universal significance in the designs of rational pore structures in energy conversions.
Keywords:
biomass
carbon–sulfur cathode
mass transfer
micro-/mesopore ratio
sodium-sulfur battery
Journal
IF:
14.1
Papers:
1.1K
Citations:
9.8K
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