公开(公告)号：JP2000235873A

公开(公告)日：2000-08-29

申请号：JP2000077738

申请日：2000-03-21

Applicant: CANON KK

Inventor： KAWAKAMI SOICHIRO ,  KOBAYASHI NAOYA ,  ASAO MASAYA

IPC: H01M10/54

Abstract: PROBLEM TO BE SOLVED: To safely collect and renew a structure member of a sealed battery without decomposition and damages. SOLUTION: A method for collecting and renewing a structure member of a sealed battery comprises a step of lowering ion conductivity at least between a positive electrode and a negative electrode, a step of opening a battery housing after the lowering step, a step of collecting the battery structure member out of the battery housing after the opening step, and a step of renewing the collected battery structure member.

公开(公告)号：JPH0982359A

公开(公告)日：1997-03-28

申请号：JP25207095

申请日：1995-09-06

Applicant: CANON KK

Inventor： KAWAKAMI SOICHIRO ,  KOBAYASHI NAOYA ,  ASAO MASAYA

IPC: H01M10/05 ,  H01M10/052 ,  H01M10/0568 ,  H01M10/40

Abstract: PROBLEM TO BE SOLVED: To provide a high capacity lithium secondary battery whose cycle service life is long and which uses intercalative reaction and deintercalative reaction of a lithium ion as charge-discharge reaction. SOLUTION: A lithium secondary battery is composed of at least a negative electrode 101, a separator 104, a positive electrode 102, electrolyte 103, a current collecting electrode and a battery case 107. The electrolyte is composed of salt of an organic fluorine-silicon compound containing at least a silicon element, a fluorine element and a carbon element.

公开(公告)号：JP2000106219A

公开(公告)日：2000-04-11

申请号：JP19428899

申请日：1999-07-08

Applicant: CANON KK

Inventor： ASAO MASAYA ,  KAWAKAMI SOICHIRO

IPC: H02J7/00 ,  H01M10/05 ,  H01M10/052 ,  H01M10/058 ,  H01M10/44 ,  H02J7/10 ,  H01M10/40

Abstract: PROBLEM TO BE SOLVED: To provide a secondary battery charging method which enhanced the charge and discharge cycle characteristic of a battery by reducing the charge and discharge cycle initial irreversible quantity of the battery after fabrication. SOLUTION: A method for charging a secondary battery having a curve of negative electrode potential or positive electrode potential to charging amount or an open voltage curve of the battery to the charging amount, with inflection points present on the curve, includes a process, in which during the operation of charging the battery by means of a charging current or charging voltage of a predetermined waveform, the battery is charged to full by causing the waveform of the charging current or charging voltage to fluctuate before the charging amount reaches one of the inflection points. This fluctuation is accompanied by an increase and/or decrease and the waveform fluctuated is that of a rectangular wave, a stepped wave, a saw-toothed wave, a sign wave, or a combination of two of them.

公开(公告)号：JPH0982312A

公开(公告)日：1997-03-28

申请号：JP25206995

申请日：1995-09-06

Applicant: CANON KK

Inventor： KAWAKAMI SOICHIRO ,  KOBAYASHI NAOYA ,  ASAO MASAYA

IPC: B82Y99/00 ,  H01M4/131 ,  H01M4/36 ,  H01M4/48 ,  H01M4/485 ,  H01M4/50 ,  H01M4/505 ,  H01M4/52 ,  H01M4/525 ,  H01M4/54 ,  H01M4/58 ,  H01M4/587 ,  H01M10/05 ,  H01M10/0525 ,  H01M10/36 ,  H01M4/02 ,  H01M4/04 ,  H01M10/40

Abstract: PROBLEM TO BE SOLVED: To provide a lithium secondary battery with high capacity and high charge/discharge efficiency by constituting a positive electrode with positive active material powder having a particle size of primary particles of 0.5μm or less. SOLUTION: A positive active material 201, a binder 202, and a conducive auxiliary material 203 are mixed, and a solvent is added to the mixture to adjust the viscosity to prepare paste. The paste is placed on a current collector 200, dried to form a positive active material layer 204, an a positive electrode 205 is obtained. The positive electrode 205 is constituted with the positive active material 201 having a particle size of primary particles of 0.5μm or less, and if necessary the thickness is adjusted with a roll press. As the conductive auxiliary material 203, amorphous carbon such as acetylene black is used, and its shape is made powdery or fibrous. As the binder 202, such as fluororesin and polyethylene are used. By using a material with high conductivity and inactive to battery reaction as the current collector of the positive electrode 205, or negative electrode electrons consumed in the electrode reaction are efficiently supplied, and current generated is collected.

公开(公告)号：JPH08213053A

公开(公告)日：1996-08-20

申请号：JP30631195

申请日：1995-11-24

Applicant: CANON KK

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

IPC: H01M10/05 ,  C01B31/02 ,  H01M4/13 ,  H01M4/36 ,  H01M4/40 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M4/58 ,  H01M4/587 ,  H01M10/0525 ,  H01M10/40 ,  H01M4/02

Abstract: PURPOSE: To improve deterioration of a battery service life due to overdischarging by manufacturing an Li secondary battery having a negative electrode containing substance capable of containing Li and/or a positive electrode containing substance into with Li can be inserted. CONSTITUTION: In an Li secondary battery having a positive electrode and a negative electrode separated from each other by a separator in a battery case, a negative electrode 1103 contains positive electrode active material 1102 (for example, Li-Mn oxide) containing Li in addition to negative electrode active material 1101. On the other hand, a positive electrode 1103 contains negative electrode active material 1002 (for example, porous Al powder) into which Li can be inserted in addition to positive electrode active material 1101. Since a substantially usable Li quantity is reduced by repeating charging and discharging, the negative electrode active material 1101 is increased. Therefore, the Li secondary battery which is excellent in overdischarging characteristics with a long cycle service life can be provided.

公开(公告)号：JPH08213008A

公开(公告)日：1996-08-20

申请号：JP30033595

申请日：1995-11-17

Applicant: CANON KK

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

IPC: H01M10/05 ,  H01M4/13 ,  H01M4/139 ,  H01M4/36 ,  H01M4/48 ,  H01M4/66 ,  H01M4/02 ,  H01M4/04 ,  H01M10/40

Abstract: PURPOSE: To suppress generation of a dendrite attendant on repeated charging/ discharging cycles to lengthen the cycle life by arranging a negative electrode covered with a film containing a specified metal oxide, a separator, a positive electrode, and an electrolyte. CONSTITUTION: The surface of a negative substrate 101 is covered with a film 102 comprising metal oxide whose standard electrode potential, or electromotive force is 1.5V or less, capable of inserting/releasing a lithium ion, and organic polymer or (peroxide) polyacid solution. The negative electrode main body 101 covered with the film 102, a separator 105, a positive electrode 103, and an electrolyte 104 are housed in a battery housing 108.

公开(公告)号：JPH0864234A

公开(公告)日：1996-03-08

申请号：JP19884694

申请日：1994-08-23

Applicant: CANON KK

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

IPC: H01M10/05 ,  H01M2/12 ,  H01M2/34 ,  H01M6/50 ,  H01M10/04 ,  H01M10/058 ,  H01M10/42 ,  H01M10/38 ,  H01M10/36 ,  H01M10/40

Abstract: PURPOSE: To provide a secondary battery having improved charging/discharging ability by including a member which is deformed at the predetermined temperature and applying/releasing a pressure to/from a part of the inside of a battery case. CONSTITUTION: A secondary battery is formed by inserting and including a group of electrodes, in which a negative electrode 101 and a positive electrode 102 are opposedly arranged via a separator 103, into a battery case 104 with a member 105 whose shape is changed at a desired temperature. When the battery is heated above the desired first temperature, the member 105 is deformed, so that the volume occupied by the group of electrodes is reduced, the group of electrodes is sufficiently pressurized in the vertical direction in the inside of the case 104, and a battery internal impedance is reduced, and consequently, a secondary battery provided with improved charging/discharging ability is obtained. If a substance whose shape can be reversibly changed is used for the member 105, a pressure applied on the group of electrodes is released at the second temperature other than the actual using temperature, so that the group of electrodes can be easily pulled out when the battery is disassembled.

公开(公告)号：JPH0850922A

公开(公告)日：1996-02-20

申请号：JP12813995

申请日：1995-05-26

Applicant: CANON KK

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

IPC: H01M4/62 ,  H01M4/134 ,  H01M4/38 ,  H01M4/40 ,  H01M4/42 ,  H01M4/46 ,  H01M4/66 ,  H01M10/05 ,  H01M10/058 ,  H01M10/38 ,  H01M4/02 ,  H01M10/40

Abstract: PURPOSE:To prevent each current collecting member from being formed into fine powder, and also prevent current collecting capacity from being degraded because of cracks taken place, which are caused by the precipitation and dissolution of lithium at the time of charging/discharging by letting a negative electrode be composed of, metallic elements capable of making an alloy of lithium, and of metallic elements unable to make an alloy of lithium, and thereby extracting an output terminal at the negative electrode out of the metallic elements unable to make an alloy of lithium. CONSTITUTION:In a cell equipped with a negative electrode 202, a positive electrode 203, electrolyte 204 and with a separator 205, the negative electrode 202 is made up of a member including metallic elements capable of making an alloy of lithium, and of a current collecting section 200 composed of metallic elements unable to make an alloy of lithium. By this constitution, even if charging/discharging are repeated, a current collecting member will never be degraded, and can thereby maintain its current collecting capacity. Therefore, an increase in charging voltage can be prevented at the time of charging at low amperage current, the occurrence of dendrite is thereby restrained, and its cycle life can be extended.

公开(公告)号：JPH0850917A

公开(公告)日：1996-02-20

申请号：JP12814295

申请日：1995-05-26

Applicant: CANON KK

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

IPC: H01M4/66 ,  H01M10/04 ,  H01M10/05 ,  H01M10/058 ,  H01M10/30 ,  H01M12/08 ,  H01M4/02 ,  H01M10/38

Abstract: PURPOSE:To restrain the growth of dendrite taking place at the time of charging, and thereby lengthen the cyclic life of the secondary cell by making a negative electrode larger in size than a positive electrode, and weakening electric field strength in the edge section of the negative electrode. CONSTITUTION:Paste where 3% carbon powder of acetyleneblack by weight and 5% polyfluoridevinylidene by weight are mixed with positive electrode active material composed of lithium manganse oxide, and prepared while N- methylpyrrolidone is being added, is applied to an aluminum foil, dried and formed into a positive electrode 102. An aluminum foil larger than by 2mm in dismeter than the positive electrode 102 is etched with 5% potassium hydroxide solution by weight, and formed into a negative electrode 101. The positive electrode 102 and the negative electrode 101 are disposed face to face with each other while a separator 105 made out of fine porous polypropylene as thin as 25mum is being held in electrolyte 104 which comprises lithiumboratetetrafluoride dissolved by 1mol in equivalent mixed solution of propylenecarbonate and dimethoxyethane, and formed into a lithium secondary cell.