Abstract: A cathode material for Li ion secondary batteries has high output and high energy density with excellent electron conductivity and Li ion conductivity. The cathode material contains an electrode active material base containing Li, which is capable of electrode oxidation/reduction accompanied by desorption and absorption of Li ions in a potential range of 4 V or more and 5 V or less based on a metal Li negative electrode and has a reversible charge/discharge capacity accompanying the electrode oxidation/reduction in the potential range described above of 30 mAh or more per 1 g. Surfaces of primary particles of an electrode active material base are coated with a layer containing a conductive polymer and a negative ion that enables the conductive polymer to produce electron conductivity equal to or higher than the electron conductivity of the electrode active material itself.

Abstract: An electrode material is composed of an electrode active material represented by the general formula LiMPO4, where M=[FetMn1-t], and t is a number between 0 inclusive and 1 inclusive. Each of the primary particles of the electrode active material has a layer on its surface, said layer having a Li ion conductive substance including Li, one or both of Fe and Mn, P and O, and conductive carbon C. Minute secondary particles are formed from a plurality of the primary particles that aggregate, and bind to each other via the layer comprising the Li ion conductive substance and the conductive carbon C. The electrode material has an area-equivalent diameter of 45 nm or more determined by a specific surface area obtained from the nitrogen adsorption Brunauer, Emmett and Teller (BET) multipoint method.

Abstract: An electrode material for a secondary battery includes crystal primary particles of an electrode active material which releases or absorbs cations of a monovalent or divalent metal when subjected to electrochemical oxidation or reduction and which has a crystal lattice in which the cations can move only in a one-dimensional movable direction during the process of oxidation or reduction. The electrode material also includes an ion-conductive substance and conductive carbon which coexist on the surface of the primary particles, in which the ion-conductive substance has a property which allows two or three-dimensional movement of the cations, and the cations are movable via a layer in which the ion-conductive substance and the conductive carbon coexist.