Cubic pyrite nickel sulfide nanospheres decorated with Ketjen black@ sulfur composite for promoting polysulfides redox kinetics in lithium-sulfur batteries

被引：49

作者：

Liang, Yazhou ^{[1
]}

Ma, Chao ^{[1
]}

Wang, Youqiang ^{[1
]}

Yu, Heli ^{[1
]}

Shen, Xiangqian ^{[1
]}

Yao, Shanshan ^{[1
]}

Li, Tianbao ^{[2
]}

Qin, Shibiao ^{[2
]}

机构：

[1] Jiangsu Univ, Coll Mat Sci & Engn, Inst Adv Mat, Zhenjiang 212013, Jiangsu, Peoples R China

[2] Changsha Res Inst Min & Met, Hunan Engn Lab Power Battery Cathode Mat, Changsha 410012, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2022年 / 907卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Lithium-sulfur batteries; Anchoring polysulfides; Electrocatalytic activity; Cubic pyriteNiS2 nanospheres; DOPED CARBON NANOFIBERS; NIS2; NANOPARTICLES; EVOLUTION; ELECTRODES; INTERLAYER; MEMBRANE; CATHODE;

D O I：

10.1016/j.jallcom.2022.164396

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：

Lithium polysulfides shuttle effect and their sluggish redox kinetics have seriously affected the development of lithium-sulfur batteries. To solve these issues, we have designed cubic pyrite-structure NiS2 nanospheres modification of Ketjen black@sulfur (NiS2/KB@S) composite as cathode materials for lithium-sulfur batteries. The NiS2 nanospheres have a positive effect on the adsorption and catalysis performance of the lithium polysulfides, which further facilitates the redox kinetics. Consequently, the NiS2/KB@S cathode with 3.1 mg cm-2 sulfur loading attains a discharge capacity of 869 mAh g-1 at 0.5 C and reversible capacity is 461 mAh g(-1) after 500 cycles. Even at high sulfur loading of 5.3 mg cm-2, the NiS2/KB@S electrode still delivers a high initial area capacity of 4.82 mAh cm-2 at 0.2 C with capacity retention capacity of 3.74 mAh cm(-2) after 120 cycles. The cyclic and rate properties of NiS2/KB@S are greatly improved over that of KB@S. The results suggest that multifunction cubic pyrite-structure NiS2 nanospheres that anchors effectively and catalysis is beneficial to the large-scale application for lithium-sulfur batteries. (C) 2022 Elsevier B.V. All rights reserved.

引用

页数：11