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Updated: Apr 16, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
Li-ion battery shut-off at high temperature caused by polymer phase separation in responsive electrolytes
Jesse C Kelly1, Nicholas L Degrood, Mark E Roberts
1Department of Chemical & Biomolecular Engineering, Clemson University, 204 Earle Hall, Clemson, SC 29634, USA. mrober9@clemson.edu.
Abstract:
For the purpose of realizing inherently safe high-power Li-ion batteries, a model Li4Ti5O12/LiFePO4 rechargeable battery is investigated using the thermally responsive polymer, poly(benzyl methacrylate), in an ionic liquid. At high temperature, battery operation is inhibited as a result of increased internal resistance caused by polymer and ionic liquid phase separation. Li-ion concentration is shown to affect the phase transition temperature and the extent to which batteries are deactivated.
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