Lithium ion secondary battery comprising an active material and solid electrolyte forming a matrix structure and method for manufacturing same

摘要

A conventional, multilayer, all-solid-state, lithium ion secondary battery where an electrode layer and an electrolyte layer are stacked has a problem that it has a high interface resistance between the electrode layer and the electrolyte layer and has a difficulty in increasing the capacity of the battery. A battery has been manufactured by applying pastes of a mixture of an active material and a solid electrolyte to form electrode layers and baking a laminate of electrode layers and electrolyte layers at a time. As a result, a matrix structure including the active material and the solid electrolyte has been formed in the electrode layers, so that a battery with a large capacity and a reduced interface resistance between the electrode layer and the electrolyte layer has been successfully achieved.

主权项

1. A multilayer, all-solid-state, lithium ion secondary battery, comprising at least a laminate of alternately stacked positive and negative electrode layers having a solid electrolyte layer interposed therebetween,
wherein at least one of the positive electrode layer or the negative electrode layer, in which an active material and a solid electrolyte form a matrix structure, consists essentially of the solid electrolyte, the active material, a collector material, and an additive, the active material is a material that efficiently releases and adsorbs lithium ions, the solid electrolyte is a material having low electron conductivity and high lithium ion conductivity, the additive is a boron compound, a sintering aid, or a combination thereof, the matrix structure is produced by baking the laminate at a temperature in a range of 600-1,100° C., the matrix structure is a structure in which material particles that form the matrix are in contact with one another to be three dimensionally continuous, wherein the three dimensionally continuous structure may have a discontinuous part in a two-dimensional cross-section if at least another cross-section is continuous in the structure, and the baked laminate is a sintered laminate.