Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 763, Issue -, Pages 228-240Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.05.286
Keywords
Graft polymerization; Polyvinyl alcohol-g-poly (acrylic acid); Water-soluble binder; Si anode; Lithium-ion battery
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Funding
- K.C. Wong Education Foundation
- National Natural Science Foundation of China [21573239]
- Guangdong Province for High-Level Talents [2014TX01N014]
- Science & Technology project of Guangdong province [2015B010135008, 2016B010114003]
- Guangzhou Municipal Project for Science Technology [201509010018]
- Natural Science Foundation of Guangdong Province [2015A030313721]
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Polyvinyl alcohol grafted poly (acrylic acid) (PVA-g-PAA) is synthesized through graft polymerization of acrylic acid (AA) onto PVA backbone via a free radical reaction. PVA-g-PAA is used as a water-soluble binder for silicon (Si) anodes in lithium-ion batteries (LIBs). The enhanced adhesion strength, excellent flexibility and high electrolyte uptake after grafting reaction render PVA-g-PAA a robust binder for Si anodes. Compared to linear PVA, PAA and CMC, optimal Si-PVA-g-10PAA electrode exhibits better cycle stability, higher Coulombic efficiency and more excellent rate capability, possessing a high electrical conductivity, low SEI/charge transfer resistance and fast lithium-ion diffusion coefficient. PVA-g-PAA binder not only maintains the electrode's mechanical and electrical integrity, facilitates a favorable electrochemical kinetics, but also assists in forming a stable SEI layer on Si surface upon long-term cycling. Such a strategy sheds light on the design of novel polymer binders for practical applications of high-capacity active materials with great volume change. (C) 2018 Elsevier B.V. All rights reserved.
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