SCHEDULED MAINTENANCE
Low-tortuous and dense single-particle-layer electrode for high-energy lithium-sulfur batteries†
a
Yucheng
Fu,
c
Zhuo
Li,
de
Yulong
Wang,
de
Zhijie
Xu,
c
Guosheng
Li,
a
Lili
Shi,
a
Yuehe
Lin,
b
Peter G.
Khalifah,
de
Wei
Wang,
a
Dongping
Lu
*a
Abstract
Reducing cathode porosity is essential to balancing the electrolyte distribution in lithium–sulfur (Li–S) cells, conserving more pore-filling electrolyte to extend cell cycle life. However, low-porosity electrodes built with nanosized sulfur/carbon (S/C) materials suffer from high tortuosity that significantly deteriorates electrode wetting and hence sulfur utilization. Enabling operation of high-loading sulfur electrodes under both low-porosity and lean-electrolyte conditions is still a challenge and is seldom discussed. In this study, we demonstrated a facile strategy for constructing low-tortuosity through-pores across both vertical and planar directions of electrodes by casting large particles into single-particle-layer electrodes. Through multi-scale characterizations and simulations, correlations between material/electrode structures, electrolyte permeability, polysulfide migration, and sulfur reactions were elucidated. The high-loading and dense sulfur cathode fabricated by this method delivers a high specific capacity (>1000 mA h g−1) at a very low electrolyte/sulfur (E/S) ratio of 4 μL mg−1. This study provides a practical approach to reducing the tortuosity of dense sulfur electrodes by manipulating the porosity distribution, which would be also applicable to improving the rate capability of other high-energy electrodes.
- This article is part of the themed collection: Recent Open Access Articles
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