公开(公告)号：US09755237B2

公开(公告)日：2017-09-05

申请号：US14893027

申请日：2014-05-22

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Akira Kano ,  Nobuhiko Hojo ,  Masahisa Fujimoto

IPC: H01M4/587 ,  H01M4/133 ,  C01B31/00 ,  C01B31/02 ,  H01M10/054 ,  H01M4/02

CPC classification number: H01M4/587 ,  C01B32/00 ,  C01B32/05 ,  C01B32/30 ,  C01B32/318 ,  H01M4/133 ,  H01M10/054 ,  H01M2004/021 ,  H01M2004/027

Abstract: A negative-electrode active material for a sodium-ion secondary battery contains a porous carbon material which has a plurality of open pores that extend through to the surface, a plurality of closed pores that do not extend through to the surface, and a solid portion made of carbon material. The distance between (002) planes of carbon in at least a part of the solid portion is 0.36 nm or more. The plurality of closed pores account for a volume ratio of not less than 30% and not more than 90% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion.

公开(公告)号：US09728784B2

公开(公告)日：2017-08-08

申请号：US14569304

申请日：2014-12-12

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Kiyohiro Hine ,  Naomi Nishiki ,  Akira Kano ,  Masahisa Fujimoto

IPC: H01M4/88 ,  H01M4/587 ,  C01B31/04 ,  H01M10/054 ,  H01M4/02

CPC classification number: H01M4/587 ,  C01B32/20 ,  C01B32/205 ,  H01M10/054 ,  H01M2004/021

Abstract: A method for producing a vitreous carbon material which can serve as a carbon material for a power storage device. In the method, a polymer material, having six-membered ring structures in its basic carbon skeleton and having a nitrogen atom, is heated at a temperature of 1000° C. to 2100° C. under an inert gas environment, and then, the polymer material is pulverized, to thereby control graphitization and crystal growth of the carbon material, thus producing a vitreous carbon material which serves as a carbon material for a power storage device.