ALL-SOLID BATTERY

• Main Authors: ITO AKIHIRO, HAYASHI GOJI, ISHIKURA TAKERO, YOSHIOKA MITSURU, ONOUCHI YASUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 09.04.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a baking type all-solid battery which has a good capacity characteristic enough to ensure a large capacity even when used under a high-temperature atmosphere, and has good self stability enough to minimize the worsening of battery characteristics.SOLUTION: An all-solid battery comprises a solid electrolytic layer 4, and a positive electrode layer 5 and a negative electrode layer 6 which are provided on opposing principal surfaces of the solid electrolytic layer 4 respectively. The solid electrolytic layer 4 includes a first solid electrolytic material. The positive electrode layer 5 and the negative electrode layer 6 each include a second solid electrolytic material. The activation energy of the first solid electrolytic material is larger than that of the second solid electrolytic material, preferably 50 kJ/mol or larger. In the first and second solid electrolytic materials, the basic skeleton of the crystalline structure is formed by a nasicon type structure. Each of the activation energies of the first and second solid electrolytic materials is controlled by a crystalline system in a material of the same composition such as a lithium-containing phosphoric acid-based compound. 【課題】高温雰囲気で使用しても大きな容量を確保できる良好な容量特性を有し、かつ保存性が良好で電池特性の劣化を極力抑制できる焼結式の全固体電池を実現する。【解決手段】正極層５及び負極層６が固体電解質層４の両主面にそれぞれ設けられている。固体電解質層４には第１の固体電解質材料が含有されると共に、正極層５及び負極層６第２の固体電解質材料が含有されている。第１の固体電解質材料の活性化エネルギーは、第２の固体電解質材料の活性化エネルギーよりも大きく、好ましくは５０ｋＪ／mol以上である。第１及び第２の固体電解質材料は、結晶構造の基本骨格がナシコン型構造で形成されており、第１及び第２の固体電解質材料の各活性化エネルギーは、リチウム含有リン酸系化合物等の同一組成系における結晶系によって制御されている。【選択図】図１