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Controlling the water absorption and improving the high C-rate stability: a coated Li-ion battery separator using β-cyclodextrin as binder

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The water absorption property of the coated separator directly affects the electrochemical performance of a Lithium-ion battery. For the water-based coated separator, the water absorption is directly dependent on the binder and ceramic components. In this work, β-cyclodextrin is chosen as the binder, and its hydrophilicity is regulated by chemical oxidation, while titanium dioxide (TiO2) is used as the ceramic component. It is found that the water absorption of the coated separator using modified β-cyclodextrin is lower than that of commercial aqueous binders such as PVA. In addition, the Li-ion battery assembled with the coated separator shows better discharge capacity retention. At 8 C rate discharge, the discharge capacity of the battery using coated separator is measured at 123 mAhg− 1, and the capacity retention is up to 88%. This work provides a new idea to modify the water-based coated separator with reduced water absorption in the storage stage.

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The authors would like to thank the National Science Foundation of China under Grant No. 51773044, 51603047, Guangdong Province Major Key Projects of Applied Research and Development of Science and Technology (2015B090925021), Guangdong Province special fund for science and technology development (research and capacity building) (2016A010103030) for financial support. They also want to thank Shenzhen Senior Materials Company, Ltd., for generously supplying raw materials.

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Correspondence to Ruijie Xu or Caihong Lei.

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Xu, R., Lin, X., Xu, J. et al. Controlling the water absorption and improving the high C-rate stability: a coated Li-ion battery separator using β-cyclodextrin as binder. Ionics 26, 3359–3365 (2020).

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