Dawson-type polyoxometalate modified separator for anchoring/catalyzing polysulfides in high-performance lithium-sulfur batteries

被引：18

作者：

Zhang, Hangyu ^{[1
]}

Ma, Zhiyuan ^{[1
]}

Duan, Suqin ^{[1
]}

Liu, Yi ^{[1
]}

Jiang, Xinyuan ^{[1
]}

Zhou, Qiuping ^{[1
]}

Chen, Ming ^{[1
]}

Ni, Lubin ^{[1
]}

Diao, Guowang ^{[1
]}

机构：

[1] Yangzhou Univ, Sch Chem & Chem Engn, Yangzhou 225002, Jiangsu, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2022年 / 428卷

基金：

中国国家自然科学基金;

关键词：

Lithium -sulfur batteries; Shuttle effect; Dawson -type polyoxometalate; Modified separator; Electrospinning; METAL-ORGANIC FRAMEWORKS; LI-S BATTERIES; WATER OXIDATION; MEMBRANE SEPARATOR; CATHODE MATERIAL; CARBON; ELECTRODE; NANOFIBERS; COMPOSITE; ELECTROCATALYSTS;

D O I：

10.1016/j.electacta.2022.140868

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Considering ultrahigh energy density as well as the cost-effectiveness of lithium-sulfur batteries (Li-S, LSBs), it is considered the most outstanding battery. However, the shuttling behavior and sluggish conversion of poly -sulfides (LiPSs), and the dendrite formation seriously impede the practical applications of LSBs. The modified separator is an effective method to solve the above problems. Herein, we propose a Dawson-type poly-oxometalate (K6P2W18O62, P2W18) modified polypropylene membrane (P2W18/PVDF/PP) with multiple func-tions for inhibiting the diffusion of LiPSs, promoting the redox kinetics of LiPSs conversion, avoiding the dendrite formation, and promoting Li+ rapid transfer. Based on spectroscopic techniques as well as electrochemical dates, it was confirmed that P2W18 can effectively adsorb LiPSs and accelerate LiPSs conversion kinetics to improve the electrochemical performance of LSBs. As a result, LSBs with P2W18/PVDF/PP separator show an initial specific capacity of 724 mAh g-1 at 3.0 C with excellent cycling stability over 400 cycles. The result offers a new perspective for exploring the role of Dawson-type polyoxometalate in extending cycling life and increasing specific capacity in LSBs.

引用

页数：9

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