ELECTRODE MATERIAL AND METHOD FOR PRODUCING ELECTRODE MATERIAL

摘要

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.

主权项

1. An electrode material comprising:
an electrode active material that is represented by a general formula LiMPO4, where M=[FetMn1-t], and t is a number between 0 inclusive and 1 inclusive, wherein each primary particles of the electrode active material has a layer on its surface, said layer having a Li ion conductive substance and conductive carbon C, said Li ion conductive substance including Li, one or both of Fe and Mn, P, and O, minute secondary particles are formed from a plurality of the primary particles that aggregate, and bind to each other via the layer, and an area-equivalent diameter of the electrode material determined by the following equation (1) with a specific surface area obtained from the nitrogen adsorption Brunauer, Emmett, Teller (BET) multipoint method is 45 nm or more, where Equation (1) is (Area-equivalent diameter)=6/{(true density of electrode active material)×(specific surface area)}.