公开(公告)号：US20190288280A1

公开(公告)日：2019-09-19

申请号：US16429716

申请日：2019-06-03

Applicant: DENKA COMPANY LIMITED

Inventor： Takashi KAWASAKI ,  Nobuyuki YOSHINO ,  Hiroshi MURATA ,  Takehiko SAWAI ,  Shinji SAITO ,  Kazunori URAO

IPC: H01M4/36 ,  C01B32/05 ,  H01M10/052 ,  H01M4/136 ,  C01B25/45 ,  H01M4/583 ,  H01M4/58

Abstract: Provided is positive electrode material for a highly safe lithium-ion secondary battery that can charge and discharge a large current while having long service life. Disclosed are composite particles comprising: particles of lithium-containing phosphate; and carbon coating comprising at least one carbon material selected from the group consisting of (i) fibrous carbon material, (ii) chain-like carbon material, and (iii) carbon material produced by linking together fibrous carbon material and chain-like carbon material, wherein each particle is coated with the carbon coating. The fibrous carbon material is preferably a carbon nanotube with an average fiber size of 5 to 200 nm. The chain-like carbon material is preferably carbon black produced by linking, like a chain, primary particles with an average particle size of 10 to 100 nm. The lithium-containing phosphate is preferably LiFePO4, LiMnPO4, LiMnxFe(1-x)PO4, LiCoPO4, or Li3V2(PO4)3.