Flexible charge storage device

A flexible charge storage device including:

• a first sheet electrode having a first terminal extending therefrom;
• a second sheet electrode disposed adjacent to the first electrode and having a second terminal extending therefrom;
• a porous separator disposed between the electrodes;
• and
• a sealed package for containing the electrodes, the separator and an electrolyte, whereby the terminals extend from the package to allow electrical connection to the respective electrodes and the package includes a plurality of layers, one of the layers being an electrolyte barrier layer for enabling the device to retain at least 90% by weight of the electrolyte when the device is maintained at 80° C. for 100 hours.

A flexible charge storage device including:

• a first sheet electrode having a first terminal extending therefrom;
• a second sheet electrode disposed adjacent to the first electrode and having a second terminal extending therefrom;
• a porous separator disposed between the electrodes;
• and
• a sealed package for containing the electrodes, the separator and an electrolyte, whereby the terminals extend from the package to allow electrical connection to the respective electrodes, the packaging including a plurality of layers, one of the layers being an electrolyte barrier layer for enabling the device to retain at least 99% by weight of the electrolyte when the device is maintained at 70° C. for 1000 hours.

A method of producing a flexible charge storage device, the method including the steps of:

• providing a first sheet electrode having a first terminal extending therefrom;
• disposing a second sheet electrode adjacent the first electrode, the second electrode having a second terminal extending therefrom;
• disposing a porous separator between the electrodes;
• providing a package including a plurality of layers, one of the layers being an electrolyte barrier layer and a strengthening layer;
• and
• sealing the electrodes and the separator in the package including an electrolyte, whereby the terminals extend from the package to allow electrical connection to the respective electrodes.