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Long life thin film battery and method therefor

  • US 6,994,933 B1
  • Filed: 09/16/2002
  • Issued: 02/07/2006
  • Est. Priority Date: 09/16/2002
  • Status: Expired due to Fees
First Claim
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1. A method for improving the life of a thin film rechargeable battery having a solid electrolyte comprising the steps of:

  • providing a thin film battery having an anode layer reactive with oxygen and water vapor;

    applying a planarization material over the anode layer and thin film battery to provide a relatively smooth, substantially pinhole free planarization layer, wherein the surface roughness of the planarization layer is no more than about 1.0 nanometers root mean square, and the planarization material in the planarization layer is substantially non-reactive with the anode layer; and

    applying one or more barrier layers to the planarization layer, the barrier layers being selected from the group consisting of metal materials, ceramic materials, and polymeric materials;

    whereby the planarization layer and the one or more barrier layers are effective to provide a thin film battery having an extended life.

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