soteras™ CCS-V binder

Ashland PVP K120 and Soteras™ CCS-V – facilitating safety coating on ceramic-coated separators

Lithium ion batteries hold a lot of energy and shorts or damage can result in potential fires or potential injury. There have been many well-publicized cases of such battery events. As lithium ion batteries grew in popularity, cell producers were looking to increase safety, and conceived of putting a thin ceramic barrier on separator layer between the anode and cathode.
Battery separator and cell producers approached Ashland for an electrochemically-stable binder to lock this ceramic layer in place. Ashland scientists from a newly formed battery materials group worked with the rechargeable battery industry to identify PVP as material meeting this need.
The primary aim of a ceramic-coated separator is to increase temperature tolerance and provide mechanical stability. The coating provides a safety benefit to the lithium-ion battery cell by forming a heat resistant layer. Ashland’s PVP chemistry has been shown to have excellent attributes for this application. The unique, extremely high molecular weight variant PVP K-120 polymer ensures outstanding high temperature performance as well as strong adhesion to the substrate. Ashland scientists made further innovations – developing a crosslinked, even more stable polymer system for an improved next generation Soteras™ binders that are now available.

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