In-situ polymerized cross-linked binder for cathode in lithium-sulfur batteries

被引：42

作者：

Ye, Heng ^{[1
,2
]}

Lei, Danni ^{[1
]}

Shen, Lu ^{[1
]}

Ni, Bin ^{[1
,2
]}

Li, Baohua ^{[1
]}

Kang, Feiyu ^{[1
,2
]}

He, Yan-Bing ^{[1
]}

机构：

[1] Tsinghua Univ, Shenzhen Geim Graphene Ctr, Grad Sch Shenzhen, Shenzhen 518055, Peoples R China

[2] Tsinghua Univ, Dept Mat Sci & Engn, Lab Adv Mat, Beijing 100084, Peoples R China

来源：

CHINESE CHEMICAL LETTERS | 2020年 / 31卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Cross-linked binder; In-situ polymerization; Volume expansion of sulfur; Shuttle effect suppression; Lithium-sulfur batteries; SILICON ANODES; PERFORMANCE; CARBON; BIOPOLYMER;

D O I：

10.1016/j.cclet.2019.04.047

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Volume expansion and polysulfide shuttle effect are the main barriers for the commercialization of lithium-sulfur (Li-S) battery. In this work, we in situ polymerized a cross-linked binder in sulfur cathode to solve the aforementioned problems using a facile method under mild conditions. Polycarbonate diol (PCDL), triethanolamine (TEA) and hexamethylene diisocyanate (HDI) were chosen as precursors to prepare the cross-linked binder. The in situ polymerized binder (PTH) builds a strong network in sulfur cathode, which could restrain the volume expansion of sulfur. Moreover, by adopting functional groups of oxygen atoms and nitrogen atoms, the binder could effectively facilitate transportation of Li-ion and adsorb polysulfide chemically. The Li-S battery with bare sulfur and carbon/sulfur composite cathodes and cross-linked PTH binder displays much better electrochemical performance than that of the battery with PVDF. The PTH-bare S cathode with a mass loading of 5.97 mg/cm(2) could deliver a capacity of 733.3 mAh/g at 0.2 C, and remained 585.5 mAh/g after 100 cycles. This in situ polymerized binder is proved to be quite effective on restraining the volume expansion and suppressing polysulfide shuttle effect, then improving the electrochemical performance of Li-S battery. (C) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.

引用

页码：570 / 574

页数：5