Polyhedral TiO2 particle-based cathode for Li-S batteries with high volumetric capacity and high performance in lean electrolyte

被引：31
作者：
Lee, Jaehyun [1 ]
Moon, Jun Hyuk [1 ]
机构：
[1] Sogang Univ, Dept Chem & Biomol Engn, 35 Baekbeom Ro, Seoul 04107, South Korea
来源：
CHEMICAL ENGINEERING JOURNAL | 2020年 / 399卷
基金：
新加坡国家研究基金会;
关键词：
Polyhedral structure; Tap density; Lean electrolyte; Titanium dioxide; Lithium sulfur batteries; POROUS CARBON; SULFUR HOST; LITHIUM; GRAPHENE; NANOPARTICLES; MICROSPHERES; INTERLAYER;
D O I：
10.1016/j.cej.2020.125670
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Achieving high volumetric capacity in Li-S batteries featuring light weight opens up unique applications. To address this, we demonstrate a high tap-density cathode based on polyhedral TiO2 (poly-TiO2) particles. The poly-TiO2 particles are obtained by fracturing 3D ordered macroporous TiO2 structure. Poly-TiO2 particles achieve high packing densities by assembly of surface-to-surface contact. Compared to commercial TiO2 nanoparticles, poly-TiO2 exhibits an apparent tap-density of about 6 times higher. We prepare a Li-S battery with a poly-TiO2 particle-assembled film as the host of the sulfur. The poly-TiO2 particle cell exhibits a volumetric capacity of 1145 mAh/cm(3), which is about 9 times higher than the TiO2 nanoparticle cathode cell. The poly-TiO2 cathode with high tap-density shows excellent performance in lean electrolyte condition. Under extremely lean electrolyte conditions with an E/S value of 2.8, the poly-TiO2 cell exhibits a high capacity of 607 mAh/g at 1C-rate.
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页数：7
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