Duracell Inc. (Bethel, CT)International Classification: H01M 452, H01M 616U.S. Classification: 429194Abstract: Heavy metal polysulfides which are insoluble in non-aqueous electrolytes and having the formula M. sub. x. sup. m (S. sub. y). sub. z. sup. -2 (wherein M is a heavy metal such as iron, cobalt, copper or nickel; S is sulfer; mx=2z; and y is greater than two) are utilized as very high energ