Curbing polysulfide shuttling by synergistic engineering layer composed of supported Sn4P3 nanodots electrocatalyst in lithium-sulfur batteries

被引：94

作者：

Ye, Zhengqing ^{[1
]}

Jiang, Ying ^{[1
]}

Feng, Tao ^{[1
]}

Wang, Ziheng ^{[1
]}

Li, Li ^{[1
,2
]}

Wu, Feng ^{[1
,2
]}

Chen, Renjie ^{[1
,2
]}

机构：

[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China

[2] Collaborat Innovat Ctr Elect Vehicles Beijing, Beijing 100081, Peoples R China

来源：

NANO ENERGY | 2020年 / 70卷

基金：

中国国家自然科学基金;

关键词：

Polysulfide shuttling; Synergistic engineering layer; Sn4P3 nanodots electrocatalyst; Acorn shell biowaste; Lithium-sulfur batteries; ENERGY-DENSITY; MODIFIED SEPARATOR; REDOX; INTERCALATION; ELECTROLYTE; PERFORMANCE; CAPACITANCE; CONVERSION; NITROGEN; CATHODE;

D O I：

10.1016/j.nanoen.2020.104532

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：

The shuttle effect in lithium-sulfur (Li-S) batteries mainly originates from the diffusion of soluble polysulfides (LiPSs) and their depressed redox kinetics. Herein, we report a synergistic engineering layer composed of acorn shell porous carbon/Sn4P3 nanodots electrocatalyst (AS PC-Sn4P3). The synergistic engineering layer can not only serve as a conductive interface but also provide a dual-adsorption barrier to retain active material and inhibit the LiPSs migrating. More importantly, electrocatalytic Sn4P3 nanodots supported on acorn shell porous carbon (AS PC) within synergistic engineering layer effectively promote lithium ion diffusion, LiPSs conversion, Li2S2/Li2S deposition, and accelerate the electrochemical redox reaction and therefore curb the soluble LiPSs shutting behavior. As a result, enhanced Li-S battery performance is achieved with synergistic engineering layer, e.g., excellent cycling stability over 900 cycles at 1.0C with a low capacity decay of 0.046% per cycle, a good rate performance, and a high areal capacity of 8.7 mAh cm(-2) under lean electrolyte conditions.

引用

页数：9

共 53 条

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