Structural Factors of Sulfur Cathodes with Poly(ethylene oxide) Binder for Performance of Rechargeable Lithium Sulfur Batteries

2002 ◽  
Vol 149 (11) ◽  
pp. A1437 ◽  
Author(s):  
Sang-Eun Cheon ◽  
Ji-Hoon Cho ◽  
Ki-Seok Ko ◽  
Chang-Wee Kwon ◽  
Duck-Rye Chang ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Structural Factors ◽  
Lithium Sulfur Batteries ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Sulfur Cathodes ◽  
Lithium Sulfur

scholarly journals Poly(ethylene Glycol-Block-2-Ethyl-2-Oxazoline) as Cathode Binder in Lithium-Sulfur Batteries

2021 ◽  
Author(s):  
Yu-Chuan Chien ◽  
Hohyoun Jang ◽  
Daniel Brandell ◽  
Matthew Lacey
Keyword(s):  
Ethylene Glycol ◽  
Composite Electrodes ◽  
Poly Ethylene Glycol ◽  
Lithium Sulfur Batteries ◽  
Redox Shuttle ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
The Stability ◽  
Power Capability ◽  
Lithium Sulfur

Functional binders constitute a strategy to overcome several challenges that lithium–sulfur (Li–S) batteries are facing due to soluble reaction intermediates in the positive electrode. Poly(ethylene oxide) (PEO) and poly(vinylpyrrolidone) (PVP) are in this context a previously well-explored binder mixture. Their ether and amide groups possess affinity to the dissolved sulfur species, which enhances the sulfur utilization and mitigates the parasitic redox shuttle. However, the immiscibility of PEO and PVP is a concern for electrode stability. Copolymers comprising ether and amide groups are thus promising candidates to improve the stability the system. Here, a series of poly(ethylene glycol-block-2-ethyl-2-oxazoline) with various block lengths is synthesized and explored as binders in S/C composite electrodes in Li-S cells. While the electrochemical analyses show that although the sulfur utilization and capacity retention of the tested electrodes are similar, the integrity of the as-cast electrodes can play a key role for power capability.<br>

scholarly journals A Poly(ethylene oxide)/Lithium bis(trifluoromethanesulfonyl)imide-Coated Polypropylene Membrane for a High-Loading Lithium–Sulfur Battery

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 535
Author(s):  
Li-Ling Chiu ◽  
Sheng-Heng Chung
Keyword(s):  
Ethylene Oxide ◽  
Liquid State ◽  
Coulombic Efficiency ◽  
Active Material ◽  
Gel Polymer Electrolyte ◽  
Lithium Ion ◽  
Polypropylene Membrane ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Lithium Sulfur

In lithium–sulfur cells, the dissolution and relocation of the liquid-state active material (polysulfides) lead to fast capacity fading and low Coulombic efficiency, resulting in poor long-term electrochemical stability. To solve this problem, we synthesize a composite using a gel polymer electrolyte and a separator as a functional membrane, coated with a layer of poly(ethylene oxide) (PEO) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). The PEO/LiTFSI-coated polypropylene membrane slows the diffusion of polysulfides and stabilizes the liquid-state active material within the cathode region of the cell, while allowing smooth lithium-ion transfer. The lithium-sulfur cells with the developed membrane demonstrate a high charge-storage capacity of 1212 mA∙h g−1, 981 mA∙h g−1, and 637 mA∙h g−1 at high sulfur loadings of 2 mg cm−2, 4 mg cm−2, and 6 mg cm−2, respectively, and maintains a high reversible capacity of 534 mA∙h g−1 after 200 cycles, proving its ability to block the irreversible diffusion of polysulfides and to maintain the stabilized polysulfides as the catholyte for improved electrochemical utilization and stability. As a comparison, reference and control cells fabricated using a PEO-coated polypropylene membrane and a regular separator, respectively, show a poor capacity of 662 mA∙h g−1 and a short cycle life of 50 cycles.

scholarly journals Poly(ethylene Glycol-Block-2-Ethyl-2-Oxazoline) as Cathode Binder in Lithium-Sulfur Batteries

2021 ◽  
Author(s):  
Yu-Chuan Chien ◽  
Hohyoun Jang ◽  
Daniel Brandell ◽  
Matthew Lacey
Keyword(s):  
Ethylene Glycol ◽  
Composite Electrodes ◽  
Poly Ethylene Glycol ◽  
Lithium Sulfur Batteries ◽  
Redox Shuttle ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
The Stability ◽  
Power Capability ◽  
Lithium Sulfur

Functional binders constitute a strategy to overcome several challenges that lithium–sulfur (Li–S) batteries are facing due to soluble reaction intermediates in the positive electrode. Poly(ethylene oxide) (PEO) and poly(vinylpyrrolidone) (PVP) are in this context a previously well-explored binder mixture. Their ether and amide groups possess affinity to the dissolved sulfur species, which enhances the sulfur utilization and mitigates the parasitic redox shuttle. However, the immiscibility of PEO and PVP is a concern for electrode stability. Copolymers comprising ether and amide groups are thus promising candidates to improve the stability the system. Here, a series of poly(ethylene glycol-block-2-ethyl-2-oxazoline) with various block lengths is synthesized and explored as binders in S/C composite electrodes in Li-S cells. While the electrochemical analyses show that although the sulfur utilization and capacity retention of the tested electrodes are similar, the integrity of the as-cast electrodes can play a key role for power capability.<br>

The Structure of Radiation Cross-Linked Poly (ethylene oxide) Gels

1971 ◽  
Vol 29 ◽  
pp. 76-77
Author(s):  
C. E. Cluthe ◽  
G. G. Cocks
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
Parallel Plate ◽  
Average Molecular Weight ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Nitrogen Gas ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Initial Viscosity

Aqueous solutions of a 1 weight-per cent poly (ethylene oxide) (PEO) were degassed under vacuum, transferred to a parallel plate viscometer under a nitrogen gas blanket, and exposed to Co60 gamma radiation. The Co60 source was rated at 4000 curies, and the dose ratewas 3.8x105 rads/hr. The poly (ethylene oxide) employed in the irradiations had an initial viscosity average molecular weight of 2.1 x 106.The solutions were gelled by a free radical reaction with dosages ranging from 5x104 rads to 4.8x106 rads.

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