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Title: Enhanced Cycling Stability of Sulfur Electrodes through Effective Binding of Pyridine-Functionalized Polymer

Porous carbons have previously been widely used as host materials for sulfur (S) electrodes because of their high conductivity and high surface area. However, they generally lack strong chemical affinity to stabilize polysulfide species. Therefore, conducting polymers have been employed to stabilize S electrodes. Integrating conducting polymers with high-surface-area carbons can create a new materials platform and synergize their functions. However, the previously used conducting polymers were often insoluble, and coating them uniformly from solution onto a nonpolar carbon substrate is a challenge. Here, we report that solution-processable isoindigo-based polymers incorporating polar substituents provide critical features: the conjugated backbone provides good conductivity; functional pyridine groups provide high affinity to polysulfide species; and they possess high solubility in organic solvents. Here, these lead to effective coating on various carbonaceous substrates to provide highly stable sulfur electrodes. Importantly, the electrodes exhibit good capacity retention (80% over 300 cycles) at sulfur mass loading of 3.2 mg/cm 2, which significantly surpasses the performance of others reported in polymer-enabled sulfur cathodes.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ; ORCiD logo [5] ;  [1] ;  [1] ;  [1] ;  [6] ; ORCiD logo [1]
  1. Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States); Univ. of California, San Diego, La Jolla, CA (United States)
  3. Stanford Univ., Stanford, CA (United States); Univ. of Windsor, Windsor, ON (Canada)
  4. Beihang Univ., Beijing (People's Republic of China)
  5. Univ. of Science and Technology of China, Hefei (People's Republic of China)
  6. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Volume: 2; Journal Issue: 10; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1457111

Tsao, Yuchi, Chen, Zheng, Rondeau-Gagne, Simon, Zhang, Qianfan, Yao, Hongbin, Chen, Shucheng, Zhou, Guangmin, Zu, Chenxi, Cui, Yi, and Bao, Zhenan. Enhanced Cycling Stability of Sulfur Electrodes through Effective Binding of Pyridine-Functionalized Polymer. United States: N. p., Web. doi:10.1021/acsenergylett.7b00772.
Tsao, Yuchi, Chen, Zheng, Rondeau-Gagne, Simon, Zhang, Qianfan, Yao, Hongbin, Chen, Shucheng, Zhou, Guangmin, Zu, Chenxi, Cui, Yi, & Bao, Zhenan. Enhanced Cycling Stability of Sulfur Electrodes through Effective Binding of Pyridine-Functionalized Polymer. United States. doi:10.1021/acsenergylett.7b00772.
Tsao, Yuchi, Chen, Zheng, Rondeau-Gagne, Simon, Zhang, Qianfan, Yao, Hongbin, Chen, Shucheng, Zhou, Guangmin, Zu, Chenxi, Cui, Yi, and Bao, Zhenan. 2017. "Enhanced Cycling Stability of Sulfur Electrodes through Effective Binding of Pyridine-Functionalized Polymer". United States. doi:10.1021/acsenergylett.7b00772. https://www.osti.gov/servlets/purl/1457111.
@article{osti_1457111,
title = {Enhanced Cycling Stability of Sulfur Electrodes through Effective Binding of Pyridine-Functionalized Polymer},
author = {Tsao, Yuchi and Chen, Zheng and Rondeau-Gagne, Simon and Zhang, Qianfan and Yao, Hongbin and Chen, Shucheng and Zhou, Guangmin and Zu, Chenxi and Cui, Yi and Bao, Zhenan},
abstractNote = {Porous carbons have previously been widely used as host materials for sulfur (S) electrodes because of their high conductivity and high surface area. However, they generally lack strong chemical affinity to stabilize polysulfide species. Therefore, conducting polymers have been employed to stabilize S electrodes. Integrating conducting polymers with high-surface-area carbons can create a new materials platform and synergize their functions. However, the previously used conducting polymers were often insoluble, and coating them uniformly from solution onto a nonpolar carbon substrate is a challenge. Here, we report that solution-processable isoindigo-based polymers incorporating polar substituents provide critical features: the conjugated backbone provides good conductivity; functional pyridine groups provide high affinity to polysulfide species; and they possess high solubility in organic solvents. Here, these lead to effective coating on various carbonaceous substrates to provide highly stable sulfur electrodes. Importantly, the electrodes exhibit good capacity retention (80% over 300 cycles) at sulfur mass loading of 3.2 mg/cm2, which significantly surpasses the performance of others reported in polymer-enabled sulfur cathodes.},
doi = {10.1021/acsenergylett.7b00772},
journal = {ACS Energy Letters},
number = 10,
volume = 2,
place = {United States},
year = {2017},
month = {9}
}