公开(公告)号：US20140234700A1

公开(公告)日：2014-08-21

申请号：US14180573

申请日：2014-02-14

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tamae Moriwaka ,  Satoshi Seo ,  Takuya Hirohashi ,  Kunio Hosoya ,  Shunsuke Adachi

IPC: H01M4/583 ,  H01M4/58 ,  H01M4/62 ,  H01M4/136 ,  H01M10/054 ,  H01M10/0568 ,  H01M4/133

CPC classification number: H01M4/625 ,  H01M4/136 ,  H01M4/5825 ,  H01M4/587 ,  H01M10/054 ,  H01M10/0568

Abstract: With a small amount of a conductive additive, an electrode for a storage battery including an active material layer which is highly filled with an active material is provided. The use of the electrode enables fabrication of a storage battery having high capacity per unit volume of the electrode. By using graphene as a conductive additive in an electrode for a storage battery including a positive electrode active material, a network for electron conduction through graphene is formed. Consequently, the electrode can include an active material layer in which particles of an active material are electrically connected to each other by graphene. Therefore, graphene is used as a conductive additive in an electrode for a sodium-ion secondary battery including an active material with low electric conductivity, for example, an active material with a band gap of 3.0 eV or more.

Abstract translation: 通过少量导电添加剂，提供了包含高活性物质的活性物质层的蓄电池用电极。 使用电极可以制造具有每单位体积电极的高容量的蓄电池。 通过在包含正极活性物质的蓄电池用电极中使用石墨烯作为导电性添加剂，形成通过石墨烯进行电子传导的网络。 因此，电极可以包括活性材料层，其中活性材料的颗粒通过石墨烯彼此电连接。 因此，在包含具有低导电性的活性物质的钠离子二次电池用电极，例如带隙为3.0eV以上的活性物质中，使用石墨烯作为导电性添加剂。