公开(公告)号：CA2911440C

公开(公告)日：2021-08-24

申请号：CA2911440

申请日：2014-05-19

Applicant: TORAY INDUSTRIES

Inventor： TAMAKI EIICHIRO ,  KUBOTA YASUO ,  KAWAMURA HIROAKI ,  MATSUSHITA MIYUKI

IPC: H01M4/58 ,  H01M4/36

Abstract: There is provided a method for producing polyanionic positive electrode active material composite particles which may be used as a positive electrode material of a lithium ion secondary battery. The method comprises mixing a polyanionic positive electrode active material precursor and graphite oxide in a solid phase to form precursor composite granulated bodies, wherein water and/or alcohol is added to a combined total of 2.5% to 20%; and heating the precursor composite granulated bodies at 500 C or higher in an inert or reducing atmosphere. In the X-ray diffraction intensity of (i) the precursor composite granulated bodies and (ii) the polyanionic positive electrode active material composite particles, the maximum intensity of the peak based on the positive electrode active material is less than 50% of, and is 50% or more of, respectively, the maximum intensity of the peak based on materials other than the positive electrode active material.

公开(公告)号：CA2911440A1

公开(公告)日：2014-11-27

申请号：CA2911440

申请日：2014-05-19

Applicant: TORAY INDUSTRIES

Inventor： TAMAKI EIICHIRO ,  KUBOTA YASUO ,  KAWAMURA HIROAKI ,  MATSUSHITA MIYUKI

IPC: H01M4/58 ,  H01M4/36

Abstract: Conventional polyanionic positive electrode active material-graphene composite particles have not been able to achieve high conductivity since the contact area between the graphene and the polyanionic positive electrode active material is small. The present invention is a method for producing polyanionic positive electrode active material composite particles, which comprises: a step 1 wherein precursor composite granulated bodies, each of which contains a polyanionic positive electrode active material precursor particle in graphite oxide, are formed by mixing a polyanionic positive electrode active material precursor and graphite oxide; and a step 2 wherein the precursor composite granulated bodies obtained in step 1 are heated at 500°C or higher in an inert atmosphere or in a reducing atmosphere. With respect to the X-ray diffraction intensity of the precursor composite granulated bodies, the maximum intensity of the X-ray diffraction peak based on the positive electrode active material is less than 50% of the maximum intensity of the X-ray diffraction peak based on the materials other than the positive electrode active material. With respect to the X-ray diffraction intensity of the polyanionic positive electrode active material composite particles, the maximum intensity of the X-ray diffraction peak based on the positive electrode active material is 50% or more of the maximum intensity of the X-ray diffraction peak based on the materials other than the positive electrode active material.

公开(公告)号：CA2893574A1

公开(公告)日：2014-07-31

申请号：CA2893574

申请日：2014-01-20

Applicant: TORAY INDUSTRIES

Inventor： KAWAMURA HIROAKI ,  KUBOTA YASUO ,  TAMAKI EIICHIRO ,  MATSUSHITA MIYUKI ,  YANG HANXIAO

IPC: H01M4/58 ,  H01M4/36

Abstract: [Problem] To provide: positive electrode active material/graphene composite particles, which are for a positive electrode active material of a lithium ion battery having low electron conductivity, and with which electron conductivity is improved while suppressing hindrance of lithium ion deintercalation into active material particles; and a positive electrode material for a lithium ion battery, said positive electrode material comprising said composite particles. [Solution] The present invention provides: positive electrode active material/graphene composite particles; and a composite particle-like positive electrode material which is used in a lithium ion battery, and which is obtained by combining, with a matrix including graphene, positive electrode active material particles, said positive electrode material wherein, a value obtained by dividing the proportion of carbon (%) in a material surface measured by way of an X-ray photoelectron measurement, by the proportion of carbon (%) in the whole material, is in the range 1.5 to 7 inclusive.

公开(公告)号：EP3001485A4

公开(公告)日：2017-04-05

申请号：EP14801413

申请日：2014-05-19

Applicant: TORAY INDUSTRIES

Inventor： TAMAKI EIICHIRO ,  KUBOTA YASUO ,  KAWAMURA HIROAKI ,  MATSUSHITA MIYUKI

IPC: H01M4/58 ,  H01M4/04 ,  H01M4/36 ,  H01M4/62

CPC classification number: H01M4/364 ,  H01M4/0471 ,  H01M4/362 ,  H01M4/5825 ,  H01M4/625 ,  H01M2004/028

Abstract: Conventional polyanionic positive electrode active material-graphene composite particles have not been able to achieve high conductivity since the contact area between the graphene and the polyanionic positive electrode active material is small. The present invention is a method for producing polyanionic positive electrode active material composite particles, which comprises: a step 1 wherein precursor composite granulated bodies, each of which contains a polyanionic positive electrode active material precursor particle in graphite oxide, are formed by mixing a polyanionic positive electrode active material precursor and graphite oxide; and a step 2 wherein the precursor composite granulated bodies obtained in step 1 are heated at 500°C or higher in an inert atmosphere or in a reducing atmosphere. With respect to the X-ray diffraction intensity of the precursor composite granulated bodies, the maximum intensity of the X-ray diffraction peak based on the positive electrode active material is less than 50% of the maximum intensity of the X-ray diffraction peak based on the materials other than the positive electrode active material. With respect to the X-ray diffraction intensity of the polyanionic positive electrode active material composite particles, the maximum intensity of the X-ray diffraction peak based on the positive electrode active material is 50% or more of the maximum intensity of the X-ray diffraction peak based on the materials other than the positive electrode active material.

公开(公告)号：EP2950373A4

公开(公告)日：2016-10-26

申请号：EP14743353

申请日：2014-01-20

Applicant: TORAY INDUSTRIES

Inventor： KAWAMURA HIROAKI ,  KUBOTA YASUO ,  TAMAKI EIICHIRO ,  MATSUSHITA MIYUKI ,  YANG HANXIAO

IPC: H01M4/587 ,  H01M4/36 ,  H01M4/505 ,  H01M4/525 ,  H01M4/58 ,  H01M4/62 ,  H01M10/0525

CPC classification number: H01M4/364 ,  H01M4/505 ,  H01M4/525 ,  H01M4/5825 ,  H01M4/587 ,  H01M4/625 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/028

Abstract: To provide: positive electrode active material/graphene composite particles, which are for a positive electrode active material of a lithium ion battery having low electron conductivity, and with which electron conductivity is improved while suppressing hindrance of lithium ion extraction/insertion into active material particles; and a positive electrode material for a lithium ion battery, said positive electrode material comprising said composite particles. [Solution] The present invention provides: positive electrode active material/graphene composite particles; and a composite particle-like positive electrode material which is used in a lithium ion battery, and which is obtained by combining, with a matrix including graphene, positive electrode active material particles, said positive electrode material wherein, a value obtained by dividing the proportion of carbon (%) in a material surface measured by way of an X-ray photoelectron measurement, by the proportion of carbon (%) in the whole material, is in the range 1.5 to 7 inclusive.