Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 4, Pages 2375-2384Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta09859k
Keywords
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Funding
- National Natural Science Foundation of China [52072118, 21872046, 51772089, 51904098]
- Outstanding Youth Scientist Foundation of Hunan Province [2018JJ1009]
- Youth 1000 Talent Program of China
- Science and Technology Innovation Platform and Talent Plan of Hunan Province [2017XK2023]
- Research and Development Plan of Key Areas in Hunan Province [2019GK2235]
- Youth Scientist Foundation of Hunan Province [2019JJ50087, 2019JJ50050]
- China Postdoctoral Science Foundation [2018M642971]
- Key Research and Development Program of Ningxia [2020BDE03007]
- Natural Science Foundation of Hunan Province [2020JJ4174]
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A low-cost and water-soluble polyelectrolyte binder (D-PAA/C-EA) was developed by neutralizing commercially available polyacrylic acid (PAA) with ethanolamine, forming a 3D cross-linked network. Electrodes fabricated using this binder exhibit strong adhesion strength, improved polysulfide adsorption, and high porosity for efficient electrolyte wetting and fast Li+ diffusion.
Binders as a necessary component in sulfur cathodes play an important role in maintaining the mechanical integrity/stability of electrodes and anchoring lithium polysulfide (LiPS) for lithium-sulfur (Li-S) batteries. In this work, we developed a low-cost and water-soluble polyelectrolyte binder (D-PAA/C-EA) by simply neutralizing commercially available polyacrylic acid (PAA) with a small molecule, ethanolamine. D-PAA/C-EA is expected to form a 3D cross-linked network by virtue of the abundant electrostatic interaction and hydrogen bonds between -COO-, -NH3+ and -OH. Compared to cathodes with PAA and poly(vinylidene fluoride) (PVDF) binders, cathodes fabricated using D-PAA/C-EA exhibit strong adhesion strength to accommodate the volume change of active materials, comparable or improved polysulfide adsorption, good dispersion of composite nanoparticles and high porosity to allow efficient electrolyte wetting and fast Li+ diffusion. Consequently, a remarkable capacity of 638.6 mA h g(-1) at a high rate (10C) is achieved for Li-S batteries with a sulfur loading of 1 mg cm(-2). Even at high sulfur loadings of 3 and 5 mg cm(-2), the discharge capacities can remain at 920.7 and 679.0 mA h g(-1) at 0.2C after 100 cycles.
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