A Strategy for Polysulfides/Polyselenides Protection Based on Co9S8@SiO2/C Host in Na-SeS2 Batteries

被引：48

作者：

Yang Tingting ^{[1
,2
]}

Qi Yuruo ^{[1
,2
]}

Zhong Wei ^{[1
,2
]}

Tao Mengli ^{[1
,2
]}

Guo Bingshu ^{[1
,2
]}

Wu Yuanke ^{[1
,2
]}

Bao Shu-Juan ^{[1
,2
]}

Xu Maowen ^{[1
,2
]}

机构：

[1] Southwest Univ, Inst Clean Energy & Adv Mat, Fac Mat & Energy, Chongqing 400715, Peoples R China

[2] Southwest Univ, Chongqing Key Lab Adv Mat & Clean Energies Techno, Chongqing 400715, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2021年 / 31卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Co9S8@SiO2; C; hollow sulfides; Na-SeS2; batteries; shuttle effect; METAL-ORGANIC FRAMEWORK; POROUS CARBON; LITHIUM; SULFUR; PERFORMANCE; SELENIUM; CATHODE; COBALT; CO9S8; SE;

D O I：

10.1002/adfm.202001952

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

To obtain unbroken sulfides with delicate morphology from metal-organic frameworks (MOFs), a method for in situ growth of SiO2 protective layers on the surface of MOFs is proposed. This strategy can be successfully expanded to a variety of MOFs (ZIF-67, Cu-MOF, ZIF-8, and PBA). Importantly, room-temperature Na-SeS2 batteries with Co9S8@SiO2/C prepared from ZIF-67 as cathode host are assembled. Due to the hollow structure that can relieve the volume expansion and the co-adsorption of sodium polysulfides/sodium polyselenides by Co9S8@SiO2/C, the SeS2/Co9S8@SiO2/C cathode shows excellent rate performance and Coulombic efficiency. In addition, ex situ X-ray diffraction and in situ Raman results show that S-8 and Se-8 are generated after the discharge of SeS2, and Se-8 is preferentially oxidized during charging.

引用

页数：8

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