公开(公告)号：DE69701126T2

公开(公告)日：2000-06-21

申请号：DE69701126

申请日：1997-07-30

Applicant: SONY CORP

Inventor： OMARU ATSUO ,  NAKAJIMA NAOYUKI ,  NAGAMINE MASAYUKI

IPC: H01M2/34 ,  H01M4/133 ,  H01M4/48 ,  H01M4/485 ,  H01M4/58 ,  H01M4/587 ,  H01M4/62 ,  H01M6/10 ,  H01M6/16 ,  H01M10/0525 ,  H01M10/0566 ,  H01M10/36 ,  H01M10/40

Abstract: In a non-aqueous electrolyte secondary battery including anode and cathode consisting of material capable of doping/undoping of lithium, and non-aqueous electrolytic solution in which electrolyte is dissolved in non-aqueous solvent, flaky graphite having high crystallinity and high electron conductivity is added as conductive agent into the anode and the cathode. Further, granulated carbon or carbon black having specific material property is added as conductive agent in addition to the flaky graphite. Thus, non-aqueous electrolyte secondary battery having long cycle life time and high reliability can be obtained.

公开(公告)号：CA2163899C

公开(公告)日：2007-09-18

申请号：CA2163899

申请日：1995-04-07

Applicant: SONY CORP

Inventor： OMARU ATSUO ,  NAKAJIMA NAOYUKI ,  NAGAMINE MASAYUKI

IPC: H01M4/24 ,  H01M10/05 ,  H01M4/587 ,  H01M10/0568 ,  H01M10/0569

Abstract: A non-aqueous lithium salt secondary battery includes an anode consisting of carbon material in which doping/undoping of lithium is permitted, a cathode and a non-aqueous electrolyte in which lithium salt is dissolved in a non-aqueous solvent. The carbon material constituting the anode is crushed graphite material having true density of 2.1 g/cm3 or more and bulk density of 0.4 g/cm3 or more. It is necessary that the graphite material is powder in which an average value of shape parameters indicated by the following expression is 125 or less: x = (L/T) x (W/T) x : shape parameter T thickness of the portion thinnest in thickness of the powder L length in a length axis direction of the powder W length in a direction perpendicular to the length axis of the powder Moreover, the graphite material is adapted so that the specific surface area is 9 m2/g or less, and, in the grain size distribution determined by the laser diffraction method, the accumulated 10% particle is 3 .mu.m or more, the accumulated 50% particle diameter is 10 .mu.m or more, and the accumulated 90% particle diameter is 70 .mu.m or less. Such graphite material powder is obtained by crushing the graphitized molding material obtained by allowing the carbon molding material to undergo heat treatment so that it is graphitized. An average of breaking strength values of particles of the graphite material is caused to be 6.0 Kg f/mm2 or more.

公开(公告)号：DE69517572D1

公开(公告)日：2000-07-27

申请号：DE69517572

申请日：1995-04-07

Applicant: SONY CORP

Inventor： OMARU ATSUO ,  NAKAJIMA NAOYUKI ,  NAGAMINE MASAYUKI

IPC: H01M10/05 ,  H01M4/587 ,  H01M10/0568 ,  H01M10/0569 ,  H01M10/40 ,  H01M4/02 ,  H01M4/58

Abstract: A nonaqueous-electrolyte secondary cell having a negative electrode made of a carbon material which can be doped with lithium and from which dopant lithium can be removed, a positive electrode, a nonaqueous electrolyte prepared by dissolving an electrolyte in a nonaqueous solvent. The carbon material is a pulverized graphite material having a true density of 2.1 g/cm and a bulk density of 0.4 g/cm . This graphite material is such a powder that the mean value of the shape parameter (x) expressed by the following formula is below 125.x = (L/T) x (W/T) where x is the shape parameter of the powder, T is the thickness of powder at the thinnest part, L is the length of powder in the length direction. W is the length of powder in the direction normal to the length direction. The graphite material has a specific surface area of 9 m /g and a cumulative 10 % grain size of 3 mu m, a cumulative 50 % grain size of 10 mu m, and a cumulative 90 % grain size of 70 mu m in the particle size distribution found by a laser diffraction method. Such a graphite material powder is prepared by, for example, graphitizing a molded body of a carbon material by heat treatment and grinding the graphitized molded body. The mean fracture strength value of the particles of the graphitic material is greater than 6.0 kgf/mm .

公开(公告)号：DE69729055D1

公开(公告)日：2004-06-17

申请号：DE69729055

申请日：1997-06-27

Applicant: SONY CORP

Inventor： OMARU ATSUO ,  NAKAJIMA NAOYUKI ,  NAGAMINE MASAYUKI

IPC: H01M4/587 ,  D01F9/12 ,  D01F9/15 ,  D01F11/12 ,  H01M4/02 ,  H01M4/04 ,  H01M4/133 ,  H01M4/38 ,  H01M6/16 ,  H01M10/0525 ,  H01M10/0566 ,  H01M4/58

Abstract: Value of fractal dimension of cross section high order structure of random radial type carbon fiber can be utilized as material parameter for evaluating the cross sectional structure. Carbon fiber in which the value of the fractal dimension is caused to fall within the range from 1.1. to 1.8 and the crystallinity has been controlled such that it falls within reasonable range is used as anode material for non-aqueous electrolyte lithium ion secondary battery. Further, carbon fiber having cross section high order structure such that the central portion is radial type structure and the surface layer portion is random radial type structure is used as anode material for improved non-aqueous electrolyte Li-ion secondary battery.

公开(公告)号：DE69422854T2

公开(公告)日：2000-10-19

申请号：DE69422854

申请日：1994-05-31

Applicant: SONY CORP

Inventor： OMARU ATSUO ,  NAGAMINE MASAYUKI ,  NAKAJIMA NAOYUKI

IPC: H01M4/58 ,  H01M10/40

Abstract: A non-aqueous liquid electrolyte secondary battery including an anode (1) formed of a carbon material capable of dope and undope of lithium, a cathode (2) formed of a lithium-containing transition metal composite oxide and a non-aqueous liquid electrolyte (3) is disclosed. The carbon material for the anode contains graphite and a non-graphitic carbon material formed of at least a non-graphitizable carbon material or a graphitizable carbon material. The non-graphitic carbon material preferably exhibits a discharge capacity per gram 80% or more of that of the graphite, measured in the first cycle of intermittent charging and discharging. The non-graphitic carbon material exhibits a ratio of a discharge capacity up to 0.3 V to a discharge capacity up to 1.5 V which is not smaller than 0.5, measured in the first cycle of intermittent charging and discharging with a standard of a lithium potential. Specifically, the graphite has a true density of 2.1 g/cm or greater, an interplanar distance of (002) of less than 0.340 nm found by X-ray diffraction, and a C-axis crystallite size of the (002) plane of 14.0 nm or greater. The non-graphitic carbon material has a true density of 1.70 g/cm or smaller, an interplanar distance of (002) plane of 0.37 nm or greater, and an exothermic peak observed at temperatures except 700 DEG C and higher temperatures in differential thermal analysis in an air stream. The non-aqueous liquid electrolyte is a liquid electrolyte formed by dissolving an electrolyte into a non-aqueous solvent containing ethylene carbonate.

公开(公告)号：DE69701126D1

公开(公告)日：2000-02-17

申请号：DE69701126

申请日：1997-07-30

Applicant: SONY CORP

Inventor： OMARU ATSUO ,  NAKAJIMA NAOYUKI ,  NAGAMINE MASAYUKI

IPC: H01M2/34 ,  H01M4/133 ,  H01M4/48 ,  H01M4/485 ,  H01M4/58 ,  H01M4/587 ,  H01M4/62 ,  H01M6/10 ,  H01M6/16 ,  H01M10/0525 ,  H01M10/0566 ,  H01M10/36 ,  H01M10/40

Abstract: In a non-aqueous electrolyte secondary battery including anode and cathode consisting of material capable of doping/undoping of lithium, and non-aqueous electrolytic solution in which electrolyte is dissolved in non-aqueous solvent, flaky graphite having high crystallinity and high electron conductivity is added as conductive agent into the anode and the cathode. Further, granulated carbon or carbon black having specific material property is added as conductive agent in addition to the flaky graphite. Thus, non-aqueous electrolyte secondary battery having long cycle life time and high reliability can be obtained.

公开(公告)号：CA2233128A1

公开(公告)日：1998-02-05

申请号：CA2233128

申请日：1997-07-30

Applicant: SONY CORP

Inventor： OMARU ATSUO ,  NAKAJIMA NAOYUKI ,  NAGAMINE MASAYUKI

IPC: H01M2/34 ,  H01M4/133 ,  H01M4/48 ,  H01M4/485 ,  H01M4/58 ,  H01M4/587 ,  H01M4/62 ,  H01M6/10 ,  H01M6/16 ,  H01M10/0525 ,  H01M10/0566 ,  H01M10/36 ,  H01M10/24

Abstract: In a nonaqueous electrolyte secondary cell having positive and negative electrodes made of a material capable of doping and removing (de-doping) lithium and a nonaqueous electrolyte prepared by dissolving an electrolyte in a nonaqueous solvent, flake-like graphite which is highly crystalline and has high electron conductivity is added as a conductor agent to the positive and negative electrodes. In addition to this flake-like graphite, granular carbon having specific physical properties or carbon black is added as the conductor agent. As a result, a nonaqueous electrolyte secondary cell having a long cycle life and a high reliability can be obtained.

公开(公告)号：CA2163899A1

公开(公告)日：1995-10-19

申请号：CA2163899

申请日：1995-04-07

Applicant: SONY CORP

Inventor： OMARU ATSUO ,  NAKAJIMA NAOYUKI ,  NAGAMINE MASAYUKI

IPC: H01M10/05 ,  H01M4/587 ,  H01M10/0568 ,  H01M10/0569 ,  H01M4/24

Abstract: A nonaqueous-electrolyte secondary cell having a negative electrode made of a carbon material which can be doped with lithium and from which dopant lithium can be removed, a positive electrode, a nonaqueous electrolyte prepared by dissolving an electrolyte in a nonaqueous solvent. The carbon material is a pulverized graphite material having a true density of 2.1 g/cm3 and a bulk density of 0.4 g/cm3. This graphite material is such a powder that the mean value of the shape parameter (x) expressed by the following formula is below 125.x = (L/T) x (W/T) where x is the shape parameter of the powder, T is the thickness of powder at the thinnest part, L is the length of powder in the length direction. W is the length of powder in the direction normal to the length direction. The graphite material has a specific surface area of 9 m2/g and a cumulative 10 % grain size of 3 .mu.m, a cumulative 50 % grain size of 10 .mu.m, and a cumulative 90 % grain size of 70 .mu.m in the particle size distribution found by a laser diffraction method. Such a graphite material powder is prepared by, for example, graphitizing a molded body of a carbon material by heat treatment and grinding the graphitized molded body. The mean fracture strength value of the particles of the graphitic material is greater than 6.0 kgf/mm2.

公开(公告)号：CA2125003A1

公开(公告)日：1994-12-04

申请号：CA2125003

申请日：1994-06-02

Applicant: SONY CORP

Inventor： OMARU ATSUO ,  NAGAMINE MASAYUKI ,  NAKAJIMA NAOYUKI

IPC: H01M4/58 ,  H01M4/40

Abstract: A non-aqueous liquid electrolyte secondary battery including an anode formed of a carbon material capable of dope and undope of lithium, a cathode formed of a lithium-containing transition metal composite oxide and a non-aqueous liquid electrolyte is disclosed. The carbon material for the anode contains graphite and a non-graphitic carbon material formed of at least a nongraphitizable carbon material or a graphitizable carbon material. The non-graphitic carbon material preferably exhibits a discharge capacity per gram 80% or more of that of the graphite, measured in the first cycle of intermittent charging and discharging. The non-graphitic carbon material exhibits a ratio of a discharge capacity up to 0.3 V to a discharge capacity up to 1.5 V which is not smaller than 0.5, measured in the first cycle of intermittent charging and discharging with a standard of a lithium potential. Specifically, the graphite has a true density of 2.1 g/cm3 or-greater, an interplanar distance of (002) of less than 0.340 nm found by X-ray diffraction, and a C-axis crystallite size of the (002) plane of 14.0 nm or greater. The non-graphitic carbon material has a true density of 1.70 g/cm3 or smaller, an interplanar distance of (002) plane of 0.37 nm or greater, and an exothermic peak observed at temperatures except 700.degree.C and higher temperatures in differential thermal analysis in an air stream. The non-aqueous liquid electrolyte is a liquid electrolyte formed by dissolving an electrolyte into a nonaqueous solvent containing ethylene carbonate.

公开(公告)号：CA2175297C

公开(公告)日：2008-07-08

申请号：CA2175297

申请日：1996-04-29

Applicant: SONY CORP

Inventor： NAGAMINE MASAYUKI ,  OMARU ATSUO ,  NAKAJIMA NAOYUKI

IPC: C01B31/04 ,  C01B31/02 ,  C04B35/528 ,  C04B35/64 ,  C25B11/12 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/58 ,  H01M4/587 ,  H01M10/04 ,  H01M10/05 ,  H01M10/0525 ,  H01M10/0566 ,  H01M10/36

Abstract: A material for a negative electrode of a cell, which is prepared according to a process of the present invention, can provides a cell having a high true specific gravity, a high charging capacity and an excellent cycle characteristic. The process of the present invention comprises the steps of carbonizing an organic compound to form a carbide thereof, pulverizing said carbide to form a powder having an average particle size of 10 .mu. to 2 mm, and sintering said powder of the carbide at a temperature of 2, 000 C or higher to produce a graphite. In addition, in accordance with the present invention, there is also provided non-aqueous electrolyte secondary cell comprising a negative electrode, which is prepared by carbonizing an organic compound to form a carbide thereof, pulverizing the carbide to form a powder having an average particle size of 10 .mu.m to 2 mm, and sintering the powder of the carbide at a temperature of 2, 000.degree. C to form a graphite.