Patent ID: 6168887
Filing Date: 2001-01-02
Classification: H01M,Y02E

Abstract:
A rechargeable electrochemical cell, including a positive electrode, a negative electrode, and an electrolyte; one of the electrodes comprising a layered bronze, comprised of a structure which comprises a stack of two alternating layers, I and II, layer I having a composition of X(M.sub.y Mn.sub.1-y)X wherein Mn is manganese, M is a 3d transition metal or aluminum or lithium or a mixture thereof, 0.ltoreq.y<0.4, and X is any atom, anion or a mixture thereof, wherein Mn or M is surrounded by six anions forming the corners of an octahedron, and layer II containing lithium atoms on L-sites that form a perfect or distorted hexagonal lattice, said stack being subject to the L-sites of layer II being surrounded by six atoms or anions that form the corners of an octahedron some of the atoms or anions each being surrounded by three of M or Mn of a type-I layer and three L-sites of a type-II layer forming the corners of an octahedron, said bronze comprising Mn in an oxidation state of less than IV.