SECONDARY BATTERY AND METHOD FOR MANUFACTURING SECONDARY BATTERY

PROBLEM TO BE SOLVED: To provide a technique enhancing charge/discharge characteristics of a secondary battery without causing a short circuit between a positive electrode layer and a negative electrode layer.SOLUTION: In a secondary battery 100, a current collector 104, a positive electrode layer 106, an electrolyte layer 108 and a negative electrode layer 110 are laminated in order on a substrate 102. The positive electrode layer 106 contains a positive electrode active material AM comprising a powdery body having a weight average particle size of 2 μm or less. At least a part of the powdery body constitutes an aggregation structure AS in the whole region of the positive electrode layer 106 or in a partial region that is located on an electrolyte layer 108 side of the positive electrode layer 106.SELECTED DRAWING: Figure 1 【課題】正極層および負極層間を短絡することなく、二次電池の充放電特性を高める技術を提供する。【解決手段】基板１０２上に、集電体１０４、正極層１０６、電解質層１０８および負極層１１０が順次積層された二次電池であって、正極層１０６は、重量平均粒子径が２μｍ以下である粉状体からなる正極活物質ＡＭを含み、正極層１０６の全領域、または、正極層１０６の電解質層１０８側に位置する一部領域において、上記の粉状体の少なくとも一部は凝集構造ＡＳを構成している二次電池１００。【選択図】図１