Hydrogel and sulfur co-coating on semispherical TiO2 as polysulfides-immobilized cathodes for high capacity and stable rate performance lithium-sulfur batteries

被引：28

作者：

Cheng, Mengying ^{[1
]}

Han, Tianli ^{[1
]}

Zhang, Min ^{[1
]}

Zhang, Haikuo ^{[2
]}

Sun, Bai ^{[3
]}

Zhu, Shuguang ^{[3
]}

Zhai, Muheng ^{[1
]}

Wu, Yaohua ^{[4
]}

Liu, Jinyun ^{[1
]}

机构：

[1] Anhui Normal Univ, Coll Chem & Mat Sci, Anhui Higher Educ Inst,Key Lab Electrochem Clean, Key Lab Funct Mol Solids,Minist Educ,Anhui Lab Mo, Wuhu 241000, Anhui, Peoples R China

[2] Shanghai Jiao Tong Univ, Ctr High Performance Comp, Dept Micro Nano Elect, Key Lab Thin Film & Micro Fabricat,Minist Educ, Shanghai 200240, Peoples R China

[3] Anhui Jianzhu Univ, Coll Environm & Energy Engn, Hefei 230601, Anhui, Peoples R China

[4] Chinese Acad Sci, Inst Intelligent Machines, Hefei 230031, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2020年 / 513卷

基金：

中国国家自然科学基金;

关键词：

Energy-storage; Layer-by-layer coating; Sulfur cathode; Hydrogel; Capacity; ELECTROCHEMICAL PERFORMANCE; CARBON; COMPOSITES; ENHANCEMENT; MECHANISMS; DFT;

D O I：

10.1016/j.apsusc.2020.145887

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Li-S batteries are promising new energy-storage systems owing to their high theoretical energy density. However, the volume-change and poor conductivity of S, and shuttle effect severely restrict applications. Here, we present a novel semispherical composite consisting of sulfur and polyaniline (PANI) hydrogel coating on a bowl-shaped hollow TiO2. The TiO2@PANI@S composites show an excellent performance with a high capacity of 1058 mAh g(-1) after 200 cycles at 0.2 C, and a stable Columbic efficiency of 99.8%. The composites also possess a recoverable rate-performance under repeated tests. The Li+ ion diffusion co-efficiency is studied, which indicates that the semispherical composite enables a rapid Li+ ion transportation. In addition, the density functional theory calculations confirm a strong adsorption of TiO2 towards polysulfides including for Li2S4, Li2S6, and Li2S8, which efficiently suppress the shuttle effect.

引用

页数：9

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