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公开(公告)号：JPH10255802A
公开(公告)日：1998-09-25
申请号：JP7281997
申请日：1997-03-11
Applicant: ASAHI CHEMICAL IND
Inventor： NAKAI IZUMI , NISHIKAWA FUMISHIGE , HIMEDA TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To provide a lithium secondary battery with a long life, in which decrease of its capacity is very small even if charging and discharging is repeated in a high energy density and a high temperature or if it is preserved at a high temperature. SOLUTION: This lithium secondary battery is equipped with nonaqueous electrolyte and a positive electrode while having lithium or a substance which can occlude and discharge lithium for a negative electrode. In this case, for the positive electrode active substance, a substance which is lithium manganese oxide with a spinel structure, and of which peak strength in the neighbourhood of 6548-6550eV is smaller in comparison with peak strength in the neighbourhood of 6556-6557eV is adopted, in a differential curve of a X-ray absorbing end neighbouring structure(XANES) spectrum at a MnK absorbing end obtained from a X-ray absorption spectrum measured by X-ray apsorbing fine structure analysis(XAFS) method.
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公开(公告)号：JPH10241686A
公开(公告)日：1998-09-11
申请号：JP5546497
申请日：1997-02-25
Applicant: ASAHI CHEMICAL IND
Inventor： TSUBATA TOSHIO , NISHIKAWA FUMISHIGE
IPC: H01M10/05 , H01M4/505 , H01M10/052 , H01M10/0566 , H01M4/58 , H01M4/02 , H01M10/40
Abstract: PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery in which cycle performances are superior, even at the temperature of a room temperature or more as keeping high capacity having such a structure as lithium containing metal oxide is spinel lithium manganese oxide, an X-ray diffraction peak exists in specified ranges, and the half-value width of the X-ray diffraction peak exists in a specified range. SOLUTION: In a nonaqueous electrolyte secondary battery, lithium-containing metal oxide is spinel lithium manganese oxide which is shown by a general formula Li[Lix Mn2-x ]O4 (where 0.05
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公开(公告)号：JPH1173962A
公开(公告)日：1999-03-16
申请号：JP24757897
申请日：1997-08-29
Applicant: ASAHI CHEMICAL IND
Inventor： YOSHIO MASAYUKI , NISHIKAWA FUMISHIGE
IPC: H01M10/05 , H01M4/505 , H01M4/525 , H01M10/052 , H01M10/0566 , H01M4/58 , H01M4/02 , H01M10/40
Abstract: PROBLEM TO BE SOLVED: To provide a nonaqueous system secondary battery with high voltage, high capacity, superior cycle characteristic, and high storage characteristic and cycle characteristic at high temperature. SOLUTION: In a nonaqueous system secondary battery having a negative active material capable of absorbing/releasing lithium ions, a positive active material comprising a lithium-containing complex oxide capable of absorbing/ releasing lithium ions, and a lithium ion conductive nonaqueous electrolyte, a spinel lithium manganese complex oxide represented by a general formula LiXMn(2- Y- Z) MYCrZO(4+ P) (where M represents Ni or Co, X, Y, Z, P are 0.85 is used as the positive active material.
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公开(公告)号：JPH059064A
公开(公告)日：1993-01-19
申请号：JP21648591
申请日：1991-08-02
Applicant: ASAHI CHEMICAL IND
Inventor： MATSUSHITA FUMIO , NISHIKAWA FUMISHIGE , AKASHI HIROYASU
IPC: C04B35/111 , C04B35/10
Abstract: PURPOSE:To improve smoothness, stability, electric insulating property, heat conductivity, mechanical strength, etc., by adding a sintering aid to specified powder and sintering them in vacuum so that the total amt. of impurities except MgO is made very small. CONSTITUTION:High purity amorphous aluminum hydroxide is fired to obtain alpha-alumina powder having 3-15m /g specific surface area, 0.6-1.4mum average particle diameter and particle size distribution divided every 0.2mum in which a section accounting for the max. percentage is 0.1-0.6 time the average particle diameter and the percentage is >=1.5 times that of any other section. A sintering aid such as MgO is added to the alumina powder and they are fired in vacuum or in H2 or O2 produce a high purity alumina sintered body having =-3.85g/cm density and such surface smoothness as 0.05-0.020mum average roughness along the center line and contg. 0.07-0.15wt.% MgO and
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公开(公告)号：JPH11154512A
公开(公告)日：1999-06-08
申请号：JP33666397
申请日：1997-11-21
Applicant: ASAHI CHEMICAL IND
Inventor： TSUBATA TOSHIO , NISHIKAWA FUMISHIGE
IPC: H01M10/05 , H01M4/505 , H01M10/0525 , H01M10/0566 , H01M4/58 , H01M4/02 , H01M10/40
Abstract: PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery that can improve its reliability during high temperature storage by using a composite oxide, as a positive electrode active material, in which the content of sulfur is not more than 4000 ppm and which includes lithium and manganese. SOLUTION: In a nonaqueous electrolyte secondary battery that includes a negative electrode active material capable of occluding and effusing lithium ions, a lithium ion conductive nonaqueous electrolyte and a positive electrode active material formed from a lithium containing metal oxide capable of occluding and effusing lithium ions, this nonaqueous electrolyte secondary battery is characterized by such features that the lithium containing metal oxide is a composite oxide including spinel group lithium and manganese that is expressed by a general formula, Li[Lix Mn2-x ]O4 , where the value x is in the range of 0
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Patent Agency Ranking
公开(公告)号：JPH10139443A
公开(公告)日：1998-05-26
申请号：JP29660896
申请日：1996-11-08
Applicant: ASAHI CHEMICAL IND
Inventor： NISHIKAWA FUMISHIGE , YOSHIO MASAYUKI
Abstract: PROBLEM TO BE SOLVED: To stably produce a lithium double oxide of uniform composition by mixing a compound containing transition metal and a compound containing an alkali metal element, firing the mixture and firing the resultant oxide together with a lithium-containing compound. SOLUTION: In the production of a lithium double oxide represented by the formula: Liw Ax My Oz (A is an alkali metal element; M is a transition metal element and comprises 1 or 2 or more kinds of elements; 0
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公开(公告)号：JPS6291462A
公开(公告)日：1987-04-25
申请号：JP22788385
申请日：1985-10-15
Applicant: ASAHI CHEMICAL IND
Inventor： MATSUSHITA FUMIO , NISHIKAWA FUMISHIGE , AKASHI HIROYASU
IPC: C04B35/111 , C04B35/10
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公开(公告)号：JPH11111291A
公开(公告)日：1999-04-23
申请号：JP27242197
申请日：1997-10-06
Applicant: MITSUI MINING & SMELTING CO , ASAHI CHEMICAL IND
Inventor： OHARA MUNEHARU , NUMATA KOICHI , YAMAGUCHI MUNETOSHI , NISHIKAWA FUMISHIGE , TSUBATA TOSHIO
Abstract: PROBLEM TO BE SOLVED: To enhance capacity of a battery, reduce self-discharge at high temperature preserving time, improve a cycle characteristic at a high temperature, and restrain generation of gas by using lithium manganese compound oxide as a positive electrode material. SOLUTION: Spinel compound oxide used as a positive electrode material is expressed by a general formula (Li1+ AMn2 A+2 BMBO4 CXC). Here, M represents one or more kinds of elements among Cr, Fe, Co and Ni, and A, B and C respectively represent (0.02
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公开(公告)号：JPH11102703A
公开(公告)日：1999-04-13
申请号：JP27801497
申请日：1997-09-26
Applicant: ASAHI CHEMICAL IND
Inventor： NAKAI IZUMI , SHIRAISHI YOHEI , NISHIKAWA FUMISHIGE , TSUBATA TOSHIO , HIMEDA TAKAHIRO , KONISHI TOKUZO
Abstract: PROBLEM TO BE SOLVED: To provide a nonaqueous secondary battery which is superior in high- temperature characteristic. SOLUTION: In a secondary battery using lithium or a material capable of absorbing/releasing lithium in a negative electrode, having a nonaqueous electrolyte, and a positive electrode, a positive active material is a lithium manganese oxide having spinel structure, in which in an X-ray absorption spectrum measured by an X-ray absorption fine structure (XAFS) analysis method, peak, intensity in the vicinity of 2.5 Å in a radius vector structure function obtained by Fourier transform of a wide region X-ray absorption fine structure spectrum (EXAFS) of MnK absorption edge is 17.5 or less, when 90% of lithium capable of theoretically being discharged is discharged.
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公开(公告)号：JPH10139444A
公开(公告)日：1998-05-26
申请号：JP29996496
申请日：1996-11-12
Applicant: ASAHI CHEMICAL IND
Inventor： NISHIKAWA FUMISHIGE , YOSHIO MASAYUKI
IPC: C01G53/00 , C01D15/00 , H01M4/485 , H01M4/525 , H01M10/05 , H01M4/02 , H01M4/04 , H01M4/58 , H01M10/40
Abstract: PROBLEM TO BE SOLVED: To obtain Li(CrNi)O2 that can heighten the charge-discharge cycle characteristics, when it is used as a positive electrode for a non-aqueous electrolyte battery by mixing and firing a chromium-containing compound and a lithium-containing compound and mixing the resultant oxide with a lithium-containing compound and firing the mixture. SOLUTION: In the production process for Li double oxide represented by the formula: Liw Crx My Oz (M is a transition metal element; 0
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