(JP10116515-A)      The flame retardant solid electrolyte comprises an ion conductive polymer matrix having moieties derived from a halogen or phosphorus-bearing polymer and capable of imparting flame retardance to the polymer matrix, and an electrolyte salt dispersed in the polymer matrix.    Also claimed are: (i) a lithium secondary cell comprising the above electrolyte; (ii) a flame retardant solid electrolyte comprising a non-ion-conductive polymer matrix having moieties derived from a halogen or phosphorus-bearing compound, capable of imparting flame retardance to the polymer matrix, and a liquid electrolyte comprising an electrolyte salt dissolved in a solvent, the liquid electrolyte being dispersed in the polymer matrix; and (iii) a lithium secondary cell comprising the electrolyte in (ii).    USE -   Used for the manufacture of high energy density cells or batteries.    ADVANTAGE -   The cell does not rely on an excited safety mechanism, thereby enhancing the safety of the cell. Any flame retardant would not be dissolved out.    (US5972539-A)      The flame retardant solid electrolyte comprises an ion conductive polymer matrix having moieties derived from a halogen or phosphorus-bearing polymer and capable of imparting flame retardance to the polymer matrix, and an electrolyte salt dispersed in the polymer matrix.    Also claimed are: (i) a lithium secondary cell comprising the above electrolyte; (ii) a flame retardant solid electrolyte comprising a non-ion-conductive polymer matrix having moieties derived from a halogen or phosphorus-bearing compound, capable of imparting flame retardance to the polymer matrix, and a liquid electrolyte comprising an electrolyte salt dissolved in a solvent, the liquid electrolyte being dispersed in the polymer matrix; and (iii) a lithium secondary cell comprising the electrolyte in (ii).    USE -   Used for the manufacture of high energy density cells or batteries.    ADVANTAGE -   The cell does not rely on an excited safety mechanism, thereby enhancing the safety of the cell. Any flame retardant would not be dissolved out.