公开(公告)号：CA2150412A1

公开(公告)日：1995-12-01

申请号：CA2150412

申请日：1995-05-29

Applicant: CANON KK

Inventor： KAWAKAMI SOICHIRO ,  MISHINA SHINYA ,  KOBAYASHI NAOYA ,  ASAO MASAYA

IPC: H01M4/02 ,  H01M4/04 ,  H01M4/13 ,  H01M4/134 ,  H01M4/38 ,  H01M4/40 ,  H01M4/42 ,  H01M4/46 ,  H01M4/66 ,  H01M6/16 ,  H01M6/22 ,  H01M10/052 ,  H01M10/0525 ,  H01M10/36 ,  H01M10/44 ,  H01M4/24

Abstract: A rechargeable lithium cell comprising an anode, a separator, a cathode, and an electrolyte or an electrolyte solution, characterized in that said anode comprises (a) a metal capable of being alloyed with lithium and (b) a metal incapable of being alloyed with lithium, said anode contains lithium when charging is operated, and wherein an anode terminal is extended from a portion formed of said metal (b). Said metal (a) may comprise one or more metals selected from the group consisting of Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In and Zn, said metal (b) may comprise one or more metals selected from the group consisting of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W and Mo.

公开(公告)号：JPH09245794A

公开(公告)日：1997-09-19

申请号：JP7308096

申请日：1996-03-05

Applicant: CANON KK

Inventor： KAWAKAMI SOICHIRO ,  KOBAYASHI NAOYA ,  ASAO MASAYA

IPC: C01B31/02 ,  C01B31/04 ,  C04B35/536 ,  H01M4/02 ,  H01M4/04 ,  H01M4/1393 ,  H01M4/36 ,  H01M4/587 ,  H01M10/05 ,  H01M10/0525 ,  H01M4/58 ,  H01M10/40

Abstract: PROBLEM TO BE SOLVED: To provide a secondary battery using a carbon material for a negative pole having a high electric capacity, a long cycle life, and proper charging and discharging efficiency. SOLUTION: In a secondary battery having at least a negative pole 101, a separator 103, a positive pole 102, an electrolyte 103, an electric connecting electrode, and a battery housing 104 and utilizing intercalation reaction and deintercalation reaction for charging and discharging, a host material constituting the nagative pole 101 and intercalating a lithium ion during charging has two or more peaks when 2θ=22 to 27 degrees based on a (002) face in a chart obtained by means of X-ray wide range diffraction of CuK α-ray. And, this secondary battery consists of a carbon material in which a crystal part with its developed graphite structure and a non-crystal part with its undeveloped graphite structure coexist.

公开(公告)号：JPH08124568A

公开(公告)日：1996-05-17

申请号：JP27987394

申请日：1994-10-19

Applicant: CANON KK

Inventor： KAWAKAMI SOICHIRO ,  KOBAYASHI NAOYA ,  MISHINA SHINYA ,  ASAO MASAYA

IPC: B82Y99/00 ,  H01M4/13 ,  H01M4/24 ,  H01M4/36 ,  H01M4/38 ,  H01M10/05 ,  H01M10/24 ,  H01M10/30 ,  H01M12/06 ,  H01M12/08 ,  H01M4/02 ,  H01M10/40

Abstract: PURPOSE: To provide a secondary battery of long cycle life having high energy desity, by arranging a negative electrode, constituted of metal powder made alloy with a bisexual metal, and a positive electrode separated by a separator in an electrolyte in a battey case. CONSTITUTION: A negative electrode of a secondary battery is constituted of metal powder made alloy with an amphoteric metal of making reaction at least with both acid and alkali preferably made alloy with one kind or more of Al, Zn, Sn, Pb. Non- amphoteric metal made alloy with the amphoteric metal is preferable, for instance, Ni, Co, Cu, Ti, Fe, etc., and elemental ratio of this metal to the amphoteric metal is prefereble 60% or less. This metal powder is set preferable to a 10m /g or more specific surface area and a 100μm or less grain size, to form into a microcapsule with a skin film, to form a layer on a negative electrode current collector through a binding agent, so as to obtain the negative electrode. Here is formed the skin film of metal oxide of WO3 or the like or organic polymer of fluororesin or the like, preferable to be formed stable with no reaction or solution with an electrolyte further to be formed ion permeable porosity.

公开(公告)号：JPH0888022A

公开(公告)日：1996-04-02

申请号：JP16367595

申请日：1995-06-29

Applicant: CANON KK

Inventor： KAWAKAMI SOICHIRO ,  MISHINA SHINYA ,  KOBAYASHI NAOYA ,  ASAO MASAYA

IPC: H01M4/62 ,  H01M4/66 ,  H01M10/05 ,  H01M10/058 ,  H01M10/38 ,  H01M4/02 ,  H01M10/40

Abstract: PURPOSE: To increase the energy density and lengthen the cycle life by covering the projecting part of a conductive body of a negative electrode with an insulator or a semiconductor film. CONSTITUTION: A projecting part 110 of a negative electrode conductor 100 is covered with an insulator or a semiconductor film 101 except for a region coming in contact with an electrolyte between the projecting parts 110. By charging, an active material 105 is deposited in the part coming in contact with the electrolyte of the conductor 100, but since the projecting part 110 is covered with the film 101, electric field is not concentrated on the projecting part 110. The electric field is concentrated on the bottom of a pore, coming in contact with the electrolyte, between the projecting parts to deposit the active material 105, and the active material 105 comes in contact with the projecting part 110 or the film 101 by continuing deposition. The growing direction of the active material 105 is suppressed, and the growth of dendrites is prevented or suppressed. If the total volume of pores formed with the film 101 is more than the total volume of the active material 105 deposited on charging, the contact area of the active material 105 with the electrolyte can be reduced, the growth of dendrites is retarded to lengthen the cycle life.

公开(公告)号：JP2000100429A

公开(公告)日：2000-04-07

申请号：JP28208698

申请日：1998-09-18

Applicant: CANON KK

Inventor： KAWAKAMI SOICHIRO ,  ASAO MASAYA ,  KOSUZU TAKESHI

IPC: H01M4/38 ,  H01M4/134 ,  H01M4/36 ,  H01M4/66 ,  H01M10/05 ,  H01M4/02 ,  H01M10/40

Abstract: PROBLEM TO BE SOLVED: To lengthen the cycle service life of a battery, and to enhance energy density by constituting an electrode structure of a current collecting body composed of a material unalloyed with lithium in electrochemical reaction and a layer composed of metallic tin or a tin alloy, and reducing the concentration of a tin element in the vicinity of the current collecting body more than that of the central part of a tin layer. SOLUTION: In this electrode structure 104, an electrode material layer 103 composed of tin particles 101 and conductive auxiliary materials 102 is arranged on a current collecting body 100, the tin concentration of a current collecting body interface of the electrode material layer 103 becomes low, and the tin concentration on the opposite side of the current collecting body side becomes high. Or the electrode structure 104 is composed of an electrode material layer of a two-layer structure having an electrode material layer 105 having the low tin concentration formed on the current collecting body 100 and an electrode material layer 106 having the high tin concentration formed on it. A material of the conductive auxiliary material 102 is desirably a material being unalloyed with lithium when depositing the lithium in electrochemical reaction and having an ionization tendency smaller than tin, thus, copper, nickel and titanium can be cited.

公开(公告)号：JPH10241748A

公开(公告)日：1998-09-11

申请号：JP6560397

申请日：1997-03-05

Applicant: CANON KK

Inventor： KAWAKAMI SOICHIRO ,  KOBAYASHI NAOYA ,  ASAO MASAYA

IPC: H01M10/54

Abstract: PROBLEM TO BE SOLVED: To safely recover a battery component, without decomposition or damages by taking out an electrolyte in a battery housing, or a solvent in the electrolyte, to lower the ion conductivity between negative and positive electrodes, and then opening the battery housing. SOLUTION: A space is formed which is composed of part of the housing external wall of the sealded type battery 100, an electrolyte extracting tube 103, and a storage tank 104. A system inside is decompressed by an exhausting means 105, connected to the tank 104 via an exhaust tube 107, to reduce pressure in the space to be lower than that in the inside of the battery 100. A safety valve 102 attached to the battery 100 is opened, and an electrolyte in the inside of the battery 100 is extracted into the tank 104 via the extracting tube 103 to be recovered. This causes the absence of the electrolyte between positive and negative electrodes in the battery 100 to reduce the ion conductivity. Then, a leak valve 113 is actuated to introduce air and nitrogen, etc., into the system, and the battery housing is opened under a condition, such that the ion conductivity between the positive and negative electrodes is reduced, thereby recovering a content member.

公开(公告)号：JPH08171901A

公开(公告)日：1996-07-02

申请号：JP26037795

申请日：1995-10-06

Applicant: CANON KK

Inventor： KAWAKAMI SOICHIRO ,  MISHINA SHINYA ,  KOBAYASHI NAOYA ,  ASAO MASAYA

IPC: H01M4/134 ,  H01M4/62 ,  H01M4/66 ,  H01M10/05 ,  H01M4/04 ,  H01M4/02 ,  H01M10/40

Abstract: PURPOSE: To restrain the occurrence and growth of dendrite by letting the negative electrode for a secondary battery be equipped with conductors and a negative electrode active material holder having insulators and semiconductors which hardly transmit precipitated negative electrode active material, and also having a void ratio of more than 10%. CONSTITUTION: The negative electrode is equipped at least with a conductor and a negative electrode active material holder. The holder is composed of conductors and semiconductors where they are made of organic and inorganic high polymers and the like which allow ions concerned with a battery reaction to be transmitted, but allow negative electrode active material such as L1 and Zn to hardly be transmitted, and have a void ratio of more than 10% formed. When the negative electrode is manufactured, void forming material is furthermore added to the aforesaid material so as to be given thereto by coating the aforesaid forming material to a current collector and the like. In the negative electrode as mentioned above, a large specific surface area can be made, there is little chance for the negative electrode active material precipitated at the time of charging to directly come in contact with electrolyte, and furthermore the electrode is restrained from being expanded because of prcipitation. By this constitution, the occurrence and growth of dendrite is restrained, its cyclic life is thereby lengthened, and furthermore energy density is also made high.

公开(公告)号：JP2000311681A

公开(公告)日：2000-11-07

申请号：JP26151699

申请日：1999-09-16

Applicant: CANON KK

Inventor： KAWAKAMI SOICHIRO ,  ASAO MASAYA

IPC: C22C13/00 ,  C22C45/00 ,  H01M4/134 ,  H01M4/1395 ,  H01M4/38 ,  H01M4/40 ,  H01M4/62 ,  H01M4/66 ,  H01M10/05 ,  H01M10/052 ,  H01M10/058 ,  H01M10/36 ,  H01M4/02 ,  H01M4/04 ,  H01M10/40

Abstract: PROBLEM TO BE SOLVED: To provide an electrode structural body capable of contributing to a lithium secondary battery having a long cycle life, high capacity and high energy density. SOLUTION: This electrode structural body is composed of a collector 100 and a negative electrode material layer 101 for a lithium secondary battery containing particles 103 containing, as a main constituent, an amorphous alloy having a nonstoichiometric ratio composition expressed by a formula Sn.A.X. In the formula, A represents at least one kind of transition metal, and X represents at least one kind selected from a group comprising O, F, N, Mg, Ba, Sr, Ca, La, Ce, Si, Ge, C, P, B, Bi, Sb, Al, In, S, Se, Te and Zn. However, X may not be contained. In the number of atoms of the respective atoms in the formula, a relationship of Sn/(Sn+A+X)=20-80 atom.% should be satisfied.

公开(公告)号：JPH11242954A

公开(公告)日：1999-09-07

申请号：JP3064298

申请日：1998-01-28

Applicant: CANON KK

Inventor： KAWAKAMI SOICHIRO ,  ASAO MASAYA ,  KOBAYASHI NAOYA ,  KOSUZU TAKESHI ,  KIMURA HIRONAO

IPC: H01M4/38 ,  H01M4/13 ,  H01M4/131 ,  H01M4/134 ,  H01M4/139 ,  H01M4/1395 ,  H01M4/36 ,  H01M4/62 ,  H01M4/66 ,  H01M4/70 ,  H01M10/05 ,  H01M10/052 ,  H01M10/058 ,  H01M10/24 ,  H01M12/08 ,  H01M4/02 ,  H01M4/04 ,  H01M4/58 ,  H01M10/40

Abstract: PROBLEM TO BE SOLVED: To provide an electrode structural body with a long cycle life, large capacity and high energy density, contributing to a secondary battery. SOLUTION: This electrode structural body has a plate-like collector 100, and an electrode-material layer 102 containing 35 wt.% or more main material composed of grains 101 having a mean grain size of 0.5 to 60 μm on one surface or both surfaces of the collector 101. Thereby, an electrode structural body is provided capable of solving the problem of a negative electrode being pulverized by repeated charging/discharging and suppressing internal short-circuiting caused by growth of deposited dendrite of lithium metal or zinc metal generated at the time of charging and causing performance deterioration. Hence, a secondary battery utilizing an oxidation-reduction reaction of lithium ions can be obtained, long having a cycle life, large capacity, and high energy density.

公开(公告)号：JPH09231962A

公开(公告)日：1997-09-05

申请号：JP35544096

申请日：1996-12-24

Applicant: CANON KK

Inventor： KAWAKAMI SOICHIRO ,  KOBAYASHI NAOYA ,  ASAO MASAYA

IPC: H01M10/05 ,  H01M4/13 ,  H01M4/133 ,  H01M4/134 ,  H01M4/139 ,  H01M4/1393 ,  H01M4/1395 ,  H01M10/052 ,  H01M10/0587 ,  H01M4/02 ,  H01M4/04 ,  H01M4/58 ,  H01M10/40

Abstract: PROBLEM TO BE SOLVED: To restrict deposition of dendrites at a cathode by a method wherein at least the surface of the anode is provided with a magnetic field generating means for generating a magnetic line of force crossing at a right angle with an electric field. SOLUTION: The surface of a cathode 101 is not uniformly flat, but some irregular corrugations or projections are present there. In this case, it is possible to restrict a dendrite-like deposition of lithium or zinc, for example, at some conductive projections where an electric line of force is concentrated by disturbing an electric line of force with a magnetic force and reducing an electric field concentrating location at the surface of a cathode at a location where some conductive projections are made. That is, the cathode 101 is provided with at least a magnetic field generating means 100 for generating a magnetic line of force crossing at a right angle with an electrical field during an electric charging operation. As a result, deposition of lithium or zinc can be uniformly produced during an electrical charging, growth of dendrites can be restricted and then a cycle life of the battery can be extended. In addition, the magnetic field generating means 100 is formed by magnetizing a magnetic member arranged at the cathode 101, no complex mechanism is not required and it can be arranged in lest-expensive manner.