(JP9050824-A)      A battery comprises a positive electrode, a negative electrode and a solid ion conductive polymer electrolyte layer formed by curing a compsn. comprising hydroxyalkyl polysaccharide and/or its deriv., an ester cpd. contg. a polyoxyalkylene component, and an ion conductive metallic salt.    Pref. the compsn. comprises 100 pts.wt. hydroxyalkyl polysaccharide and/or its deriv. and 20-2,000 pts.wt. ester cpd. contg. polyoxyalkylene component. The hydroxyalkyl polysaccharide deriv. contains hydroxy gps. bearing substituents through ester or ether bonding. The ester cpd. is a mixt. of diester cpd. contg. a polyoxyalkylene component of formula (I) and monoester cpd. contg. a polyoxyalkylene component of formula (II), the wt. ratio of diester:monoester being 2.0-0.2.    R1, R2 and R3 = H or 1-5C alkyl; and x is greater than or equal to 1, y is greater than or equal to 0 and x+y is no more than 50, or x is greater than or equal to 0, y is greater than or equal to 1, and x+y is no more than 50.    R4, R5 and R6 = H or 1-5C alkyl, and a is greater than or equal to 1, b is greater than or equal to 0 and a+b is no more than 50, or a is greater than or equal to 0, b is greater than or equal to 1, and a+b is no more than 50.    ADVANTAGES -   The electrolyte has high ion conductivity, excellent film formability, high film toughness and strength, excellent handling properties, and battery is rechargeable.    (EP757397-B1)      A battery comprises a positive electrode, a negative electrode and a solid ion conductive polymer electrolyte layer formed by curing a compsn. comprising hydroxyalkyl polysaccharide and/or its deriv., an ester cpd. contg. a polyoxyalkylene component, and an ion conductive metallic salt.    Pref. the compsn. comprises 100 pts.wt. hydroxyalkyl polysaccharide and/or its deriv. and 20-2,000 pts.wt. ester cpd. contg. polyoxyalkylene component. The hydroxyalkyl polysaccharide deriv. contains hydroxy gps. bearing substituents through ester or ether bonding. The ester cpd. is a mixt. of diester cpd. contg. a polyoxyalkylene component of formula (I) and monoester cpd. contg. a polyoxyalkylene component of formula (II), the wt. ratio of diester:monoester being 2.0-0.2.    R1, R2 and R3 = H or 1-5C alkyl; and x is greater than or equal to 1, y is greater than or equal to 0 and x+y is no more than 50, or x is greater than or equal to 0, y is greater than or equal to 1, and x+y is no more than 50.    R4, R5 and R6 = H or 1-5C alkyl, and a is greater than or equal to 1, b is greater than or equal to 0 and a+b is no more than 50, or a is greater than or equal to 0, b is greater than or equal to 1, and a+b is no more than 50.    ADVANTAGES -   The electrolyte has high ion conductivity, excellent film formability, high film toughness and strength, excellent handling properties, and battery is rechargeable.