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Technology

The porous fiber starts as a preform containing a hollow region that is filled with a solution.  During drawing, temperature is maintained so that the solution remains fully liquid.  After drawing, the fiber cools to below the phase-separation temperature of the solution.  This causes the solution to separate into solid and liquid regions, creating liquid-filled pores along the fiber length.  If desired, the liquid can be drained from the pores and optionally replaced with another material.  The liquid-filled porous structure can serve as the electrolyte for a battery.  Other battery components (such as the current collector, anode and cathode) can be included in the preform so the drawn fiber becomes a fully functional, flexible battery.  Alternatively, the fiber can be configured for filtration or chemical synthesis.