In Situ-Cross-linked Supramolecular Eco-Binders for Improved Capacity and Stability of Lithium-Sulfur Batteries

Man，Limin1,3; Yang，Yu1,3,4; Wang，Hui2; Wang，Yinyan2; An，Yanan2; Bao，Jiali1,3; Wang，Chaoyang2,4; Yang，Zhuohong1,3

2021

10.1021/acsaem.1c00207

ACS Applied Energy Materials   影响因子和分区

2574-0962

Rechargeable lithium-sulfur batteries (LSBs) have caused widespread concern because of their high theoretical energy density and environmental benefits. However, LSBs accompany a series of phase transitions of which occur significant volume changes during charging and discharging, which severely reduce the lifetimes of LSBs. In this study, a supramolecular eco-binder with in situ-cross-linking is investigated to extend the charge-discharge cycle of LSBs. Specifically, a vegetable-oil-based cationic waterborne polyurethane polymer with phytic acid (WPUP) is developed as an eco-binder for sulfur cathodes. A low-viscosity WPUP is used in the electrode fabrication process to achieve homogeneous, dense coating of the active materials. The WPUP participates in an in situ covalent cross-linking reaction to produce a three-dimensional network with excellent mechanical properties. This ensures robust adhesion and much shorter ion- and electron-transfer paths. The resultant sulfur cathodes compose of high initial discharge capacity of 1051 mAh g-1 at 0.5 C, promising long-term battery cycling stability (632 mAh g-1 after 600 charge/discharge cycles at 0.5 C), and high rate cycling performance (634 mAh g-1 at 4 C). As proof-of-concept, a Li-S full cell is fabricated with a 350% oversized lithium anode. It provides a good capacity of 1.3 mA h cm-2 and high capacity retention of 99.83% per cycle over 300 cycles. This binder-design strategy will be important in developing high-capacity and long cycle stable LSBs.

biopolymer lithium-sulfur battery polymer binder polysulfide sulfur cathode

SCI ; EI

英语

通讯

WOS:000644737800086

20211910309533

Binders ; Cathodes ; Crosslinking ; Electron transport properties ; Lithium batteries ; Lithium compounds ; Supramolecular chemistry

Primary Batteries:702.1.1 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Chemical Agents and Basic Industrial Chemicals:803

2-s2.0-85105091288

Scopus

1.Key Laboratory for Biobased Materials and Energy of Ministry of Education,College of Materials and Energy,South China Agricultural University,Guangzhou,483 Wushan Road,510642,China
2.Research Institute of Materials Science,South China University of Technology,Guangzhou,381 Wushan Road,510640,China
3.Guangdong Laboratory for Lingnan Modern Agriculture,South China Agricultural University,Guangzhou,483 Wushan Road,510642,China
4.Department of Materials Science and Engineering,Guangdong Provincial Key Laboratory of Energy Materials for Electric Power,Southern University of Science and Technology,Shenzhen,1088 Xueyuan Avenue,518055,China

Man，Limin,Yang，Yu,Wang，Hui,et al. In Situ-Cross-linked Supramolecular Eco-Binders for Improved Capacity and Stability of Lithium-Sulfur Batteries[J]. ACS Applied Energy Materials,2021,4:3803-3811.

Man，Limin.,Yang，Yu.,Wang，Hui.,Wang，Yinyan.,An，Yanan.,...&Yang，Zhuohong.(2021).In Situ-Cross-linked Supramolecular Eco-Binders for Improved Capacity and Stability of Lithium-Sulfur Batteries.ACS Applied Energy Materials,4,3803-3811.

Man，Limin,et al."In Situ-Cross-linked Supramolecular Eco-Binders for Improved Capacity and Stability of Lithium-Sulfur Batteries".ACS Applied Energy Materials 4(2021):3803-3811.