Solid state battery and solid state battery manufacturing method

Abstract

What is provided is a solid state battery which can be manufactured with a high yield, has little variation in initial performance, and has a long lifespan and a method of manufacturing the same. Thesolid state battery includes a flat laminated structure which is obtained by winding an electrode laminated sheet extending from a first end to a second end. In the electrode laminated sheet, a firstsheet and a second sheet are disposed while a first connection portion and a second connection portion face each other in a plan view, a first region in which a first solid electrolyte sheet, a firstelectrode, a second solid electrolyte sheet, and a second electrode piece are laminated in this order and a second region in which a second electrode piece, a first solid electrolyte sheet, a first electrode, and a second solid electrolyte sheet are laminated in this order are alternately formed in a longitudinal direction between the first connection portion and the second connection portion, andthe electrode laminated sheet is wound around the first end so that the first electrode and the second electrode piece are alternately laminated so as to overlap each other in a plan view.

Description

Technical field [0001] The invention relates to an all-solid-state battery and a manufacturing method of the all-solid-state battery. Background technique [0002] Compared with conventional lithium secondary batteries, all-solid-state batteries in which a solid electrolyte is arranged between the positive electrode and the negative electrode have higher safety, a wide range of usable temperatures, and a short charging time, so they are attracting attention. [0003] As a manufacturing method of an all-solid-state battery, for example, a method is proposed in which a first laminate formed by pressing and joining the positive electrode mixture layer of the positive electrode layer and the first solid electrolyte layer, and the negative electrode mixture of the negative electrode layer The second laminate formed by pressure bonding of the layer and the second solid electrolyte layer is pressure bonded to be integrated (for example, refer to Patent Document 1). [0004] In addition, as...

AI Technical Summary

Problems solved by technology

Therefore, in an all-solid-state battery having a wound solid electrolyte layer, there is a difference in battery performance between the flat part and the curved part, and variations in initial performance and poor deterioration characteristics are likely to occur.

[0011] In addition, in an all-solid-state battery having a wound solid electrolyte layer, the positive electrode active material layer and the negative electrode active material layer are easily broken or chipped due to the restraint pressure applied during use, and sufficient life may not be obtained.

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