Effects of Island-Coated PVdF-HFP Composite Separator on the Performance of Commercial Lithium-ion Batteries

The widespread industrialization of high-energy density commercial lithium-ion batteries has long been challenged by issues of safety and efficiency stemming from uncontrollable lithium dendritic growths. Here, an island-coated composite separator has been fabricated using a pre-swelling process wit...

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Bibliographic Details
Published inCoatings (Basel) Vol. 8; no. 12; p. 437
Main Authors Zhao, Junhua, Hu, Qin, Wang, Jun, Zhang, Pinjie, Zhu, Youliang, Wu, Guoqiang, Lv, Yanwen, Lv, Liang, Zhao, Yongjin, Yang, Meiting
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.12.2018
Subjects
Contact angle
Deformation
Dendritic structure
Design
Dispersions
Electrodes
Electrolytes
Electrolytic cells
Energy storage
Flux density
Graphite
Humidity
Industrial development
Lithium
Lithium-ion batteries
Mechanical properties
Morphology
Polyethylene
Polymers
Rechargeable batteries
Separators
Surface structure
Swelling
Wettability
United States > US
China
Japan
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Summary:The widespread industrialization of high-energy density commercial lithium-ion batteries has long been challenged by issues of safety and efficiency stemming from uncontrollable lithium dendritic growths. Here, an island-coated composite separator has been fabricated using a pre-swelling process with water-based dispersions to address the issue of dendrite growth. The pre-swelling of the polymer particle surface balances the contradiction between the high crystallinity and electrolyte compatibility showing high electrolyte wettability and electrolyte uptake ability. Furthermore, the point-to-point surface structure can balance the high interfacial adhesion of electrodes and anti-deformation ability well, which is beneficial for preventing ripple-shaped and pot-shaped deformation, smoothing the solid particle morphology of the electrode and achieving a steady interfacial structure for lithium diffusion in cells. This new strategy constructs a non-continuous novel structure, achieving greatly improved dendrite growth suppressing and cell interface stabilization. This paper has opened up a new method for the development of low cost, simple process and easy industry of the lithium-ion pouch cell with improved quality and efficiency.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings8120437