WO2004078653A1 - 斜方晶マンガン酸リチウム粉体の製造方法 - Google Patents
斜方晶マンガン酸リチウム粉体の製造方法 Download PDFInfo
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- WO2004078653A1 WO2004078653A1 PCT/JP2003/002664 JP0302664W WO2004078653A1 WO 2004078653 A1 WO2004078653 A1 WO 2004078653A1 JP 0302664 W JP0302664 W JP 0302664W WO 2004078653 A1 WO2004078653 A1 WO 2004078653A1
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- orthorhombic
- lithium
- firing
- lithium manganate
- producing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/0095—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes in which two different types of particles react with each other
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G45/00—Compounds of manganese
- C01G45/12—Manganates manganites or permanganates
- C01G45/1221—Manganates or manganites with a manganese oxidation state of Mn(III), Mn(IV) or mixtures thereof
- C01G45/1228—Manganates or manganites with a manganese oxidation state of Mn(III), Mn(IV) or mixtures thereof of the type [MnO2]n-, e.g. LiMnO2, Li[MxMn1-x]O2
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
- C01P2006/13—Surface area thermal stability thereof at high temperatures
Definitions
- the present invention relates to a method for producing a lithium manganese oxide (L IMn_ ⁇ 2) based powder having a structure of orthorhombic, it is possible to increase the battery capacity because particular are fired at low temperatures and the hydrogen concentration in the sintering atmosphere gas, the firing temperature, firing time Ri by the adjusting the orthorhombic L i Mn 0 2 particles having an average particle diameter and orthorhombic capable of easily controlling the specific surface area L IMnO of The present invention relates to a method for producing a system 2 powder.
- Background art
- Rechargeable batteries using lithium-ion have the advantages of high discharge potential (operating voltage), light weight and high energy density, so they can be used in mobile phones, notebook personal computers, video cameras with integrated cameras. The demand for power supplies for such devices is rapidly expanding.
- This lithium ion secondary battery is composed of a positive electrode containing an active material capable of reversibly occluding and releasing lithium ions, a carbon negative electrode, and a non-aqueous electrolyte in which a lithium salt is dissolved in a non-aqueous solvent.
- the positive electrode material of 4 V-class battery of low cost with Mn, L i Mn 2 0 4 and L iMn0 2 is noted conventionally, are being developed.
- L IMn0 average valence of 2 manganese is trivalent, 3. high capacity can be expected as compared with the pentavalent L IMN 2 0 4, is expected as a positive electrode material of the next generation.
- the secondary particles of the lithium manganese composite oxide have a spherical or elliptical spherical shape, and the tap density is 1.5 g / cm 3 or more, so that the formability and filling when forming the positive electrode are improved.
- a secondary battery has also been proposed that has improved dischargeability and increased discharge capacity per unit volume (for example, see Patent Document 1).
- Synthesis of the conventional i MnO 2 has been performed by a solid phase reaction method.
- the solid-phase reaction method has attracted attention because of its low production cost.
- the solid phase reaction method has good crystallinity because it is sintered at a high temperature range of 800 ° C to 100 ° C, and has good cycle characteristics when used as a cathode material for batteries. It is known.
- low capacity (less than 30mAh / g) is a disadvantage.
- a low-temperature synthesis method using a sintering temperature of 450 ° C or less by a sol-gel reaction method, a hydrothermal reaction method, or the like is widely practiced.
- high capacity about 20 O mAh / g
- the cycle characteristics due to structural changes are poor, and a temporary decrease in capacity is a problem.
- the production cost is higher than that of the solid phase method because the solution must be dried after the synthesis treatment and the ice heat synthesis requires a long time (about 8 hours). I have. Therefore, it is desired to develop a practical manufacturing process to replace them.
- fine LiMn ⁇ ⁇ 2 is sintered in a temperature range of 800 ° C to 100 ° C. since n 0 2 crystal particles tend to coarsen, high capacity characteristics as the battery that is difficult to obtain had been raised as a problem.
- Li MnO 2 as a positive electrode active material had a larger specific surface area and a smaller particle diameter, and thus had a larger electric capacity.
- the specific surface area of LiMnO 2 is excessively large and the particle diameter is excessively small, the handleability of LiMnO 2 as a powder is deteriorated, and iMnO 2 as a positive electrode active material is adhered to the electrode surface. Requires a large amount of binder, and the content of the positive electrode active material decreases relatively. As a result, high-capacity batteries have not been obtained.
- the present invention has been made in order to solve the problems of the prior art as described above. Since the battery is fired at a low temperature, the battery capacity can be increased, and the hydrogen concentration of the firing atmosphere gas, the firing temperature by adjusting the firing time, orthorhombic L i M n 0 2 the method of producing particles having an average particle size and the orthorhombic capable of easily controlling the specific surface area L i M n 0 2 system powder The purpose is to provide. Disclosure of the invention
- the mechanochemical reaction means that the particles are given a mechanical energy (compression, shear, rubbing, stretching, bending, impact, etc.) to activate and amorphous the particle surface, so that it can be easily compounded.
- This is a reaction method for
- the soft mechanochemical reaction used in the present invention means that the surface of the particles is activated by the mechanical energy, and a hydroxide is used as one of the raw materials to be composited, so that the hydroxyl group on the surface becomes different. It produces a heterometaoxane bond with a functional group on the surface of the oxide or hydroxide, which has a dehydration reaction, and this strong bond has an advantage that a complexing reaction is likely to occur.
- the reaction for example, in the case of manufacturing a composite oxide ceramic, the reaction can be easily progressed under soft conditions as compared with the case of using the mechanochemical reaction, such as lowering the sintering temperature. It has the feature of.
- the lithium source material and the manganese source material have a Li: Mn molar ratio of 0.5 to 1.5: 1.5 to 0.5.
- a milling treatment in which the milling compression force acting on the obtained raw material mixture is in the range of more than 1 to 200 G or less. For 10 minutes to 100 hours to activate the raw material mixture particles and to prepare a precursor sample by amorphizing the surface of each particle. ⁇ Baking at a temperature of 300 to 600 ° C. for 30 minutes to 24 hours in a hydrogen mixed gas atmosphere.
- the crystal system of the lithium manganate powder be a single phase.
- the mixture is mixed so that the molar ratio of L i: Mn is in the range of 0.5 to 1.5: 1.5 to 0.5, so that the orthorhombic crystal (orthor homb) can be obtained.
- L iMn0 2 particles o- L iMn0 2 particles than less that the crystal phase appears in high purity orthorhombic L iMn0 2 particles.
- the raw material mixture is mixed by performing a grinding treatment for 10 minutes to 100 hours so that the milling compression force acting on the obtained raw material mixture is in the range of more than 1 G and not more than 200 G.
- a precursor sample is prepared by activating the body particles and making the surface of each particle amorphous. Even if the milling compressive force acting on the raw material mixture is set to exceed 200 G, the effect is saturated. Therefore, the milling compression force is set to be in a range of more than 1 G and not more than 200 G, more preferably in a range of 20 to 150.
- various types of particulate material processing apparatuses based on various wet methods and dry methods such as a multi-ring medium mill, a ball mill, a medium stirring mill, and a planetary ball mill can be used.
- the dry grinding apparatus 1 shown in FIG. 1 has a rotating shaft for enabling the generation of a swirling flow center of the particulate material in a cylindrical region formed by the rotation of the pressing body 5 in the casing 3.
- a space area 6 having no extension or the like of 201 is formed, and the rotation of the casing 3 and the rotation of the rotating body 4 are configured to be rotationally controlled in the same or opposite directions at different rotation speeds,
- the pressing body 5 is configured to be supported in a laterally cantilevered manner with respect to the rotating body 4.
- the dry grinding apparatus 1 comprises a housing 2 mounted on a gantry 101 and a casing 3 forming a processing chamber for the particulate material. This is a so-called double rotating shaft mechanism in which the sub-rotating shaft 202 inserted and fitted with the main rotating shaft 201 is integrally fitted.
- a gas supply pipe 205 for supplying the shaft sealing gas G and a material supply pipe 206 for continuously supplying the processed material are each provided in a double-tube structure. Piped. Further, a supply port 210 for supplying the processed material supplied to the material supply pipe 206 into the casing 3 is provided.
- Pulleys 203 and 204 are provided, each of which is independently rotatable, and its rotation control is individually controlled in the same direction or in the opposite direction by a control device (not shown). It is configured such that rotation control synchronized with one of the rotation speeds is possible.
- a cylindrical container 301 constituting the casing 3 is attached to the other end side of the auxiliary rotary shaft 202 via a port 211 via a sleeve 211.
- a rotating body 4 provided in the container 301 is attached to the other end side of the main rotating shaft 201 so that a center portion thereof can be fitted by a nut 209,
- Reference numeral 4 denotes a shape in which the same number of arms as the number of pressing bodies 5 are radially extended from the center.
- the container 301 and the rotating body 4 are configured to be rotatable in association with the rotation of the rotating shafts 202 and 201, respectively.
- the pressing bodies 5 are spaced apart from each other at equal intervals on the arm edge side of the rotating body 4 that is equidistant from the rotation axis of the main rotating shaft 201, and the three bodies are cantilevered at one end. The other end is connected and supported by a ring-shaped support plate 401 having a large opening in the center. Then, when the pressing body 5 is turned in cooperation with the rotation of the rotating body 4 accompanying the rotation of the main rotating shaft 201, a laterally cylindrical shape having an opening on the front cover 304 side is formed. An area is formed, and the cylindrical area is provided with a space area 6 having no members such as an extension of the rotary shaft 201.
- Each pressing body 5 is disposed at an equal interval so as to be rotatable and swingable on the support shaft 502, which is parallel to and at the same distance from the rotation axis of the main rotation shaft 201.
- Four grinding rings 501 as a ring body and a grinding ring 503 smaller in diameter than the grinding ring 501 interposed between them so as to keep the distance between the grinding rings 501.
- the crushing rings 501, 501,... Contact the inner cylindrical wall 302 while rotating by centrifugal force in cooperation with the rotation of the rotating body 4. Be composed.
- FIG. 3 is a view showing an arrangement of the crushing ring 501.
- the sliding rings 503 are interposed between the adjacent crushing rings 501 and 501 so that they are exactly separated by an interval of twice the thickness of the crushing ring 501.
- the crushing rings 5 0 1 and 5 0 1 of the other two pressing members 5 and 5 are set so as to be arranged at corresponding positions between the adjacent crushing rings 5 0 1 and 5 0 1 of the pressing body 5.
- the structure in which the crushing ring 501 is dispersively pressed is such that the surface area of the cylindrical inner wall 302 that is not pressed by the turning of the crushing ring 501 shown in FIG.
- the particulate material is retained in a part of the casing 3. And move the entirety of the inner wall to keep the swirling flow of the particulate material in the casing 3 in a good circulating flow state, and evenly distribute the energy such as the compressive force and shear force of the pressing body 5 based on the centrifugal force.
- the crystal structure becomes amorphous near the particle surface, and the solid-phase reaction by mechanochemical reaction can be promoted.
- the grinding time is 10 minutes to 100 hours, but from the viewpoint of preventing contamination, it is desirable to perform the processing in as short a time as possible.
- Air In the friction ⁇ adjusted to control the amount of adsorption of OH group derived from H 2 0 nascent surface moisture by powder from the outside, nitrogen gas, nitrogen hydrogen mixed gas, the moisture It is desirable to use
- the precursor sample obtained by the grinding treatment by the above-described grinding treatment device 1 is then subjected to a temperature of 300 to 600 ° C. in a nitrogen / hydrogen mixed gas atmosphere for 30 minutes to 24 hours. by firing time, fine orthorhombic lithium manganate powder (o- L i M n 0 2 particles) is obtained.
- the mixing ratio of hydrogen in the nitrogen / hydrogen mixed gas is preferably 0.1 to 15% by volume (vol.%). If the mixing ratio of hydrogen is too large so as to exceed 15% by volume, the reducing power becomes too strong, Mn is reduced, and changes to Mn0 to form an impurity phase.
- a dense o-Li can be obtained even at a low temperature of 500 ° C by a soft mechanochemical reaction involving an acid-base reaction. M n 0 2 particles are obtained.
- L i OH ⁇ H 2 0 as a lithium source material
- L i OH and L i 2 C_ ⁇ least hand to use a kind of 3
- the manganese source trivalent using Mn 2 0 3 is a manganese oxide as a raw material, it is preferred to combine lithium (L i) hydroxide and manganese (Mn) oxide.
- the lithium source material as well as using L i 2 C0 3 is a carbonate, using MnO 0 H is a trivalent Manganokishi hydroxide as manganese source material, Manganokishi hydroxide and lithium carbonate It is preferred to combine with a substance.
- the milling of the raw material mixture is preferably performed in air, nitrogen gas, or a mixed gas of nitrogen and hydrogen with adjusted moisture. If the moisture in the grinding atmosphere is high and the relative humidity exceeds 20%, the moisture will adhere to the surface of the highly active particles, reducing the reactivity of the particles.
- the precursor sample is fired within 24 hours immediately after the completion of the grinding treatment. Immediately after the completion of the grinding process, the activated state and amorphous state of each particle are extremely high, but if left for 24 hours or more, the activated state is greatly lost. It becomes difficult to prepare lithium oxide powder (baked product particles).
- the firing temperature, the firing time, the type of the atmosphere gas, and the hydrogen gas concentration in the atmosphere gas are adjusted.
- Te by firing the precursor sample L i M n 0 1 ⁇ 3 2 specific surface area of the fired product particles. While controlling the range of 5 m 2 / g, 0 the particle size of the calcined product particles. [Delta] [delta] ⁇ ⁇ It becomes possible to control preferably in the range of 1 to 3 m.
- L i M n 0 2 sintered product particles that have a the specific surface area or particle size may be the binder amount used in securing the positive electrode Sumutame in small amounts to increase the active material loading in the cathode, A battery with a high charge / discharge capacity can be obtained.
- crystal grain size can synthesize small L i M n 0 2 particles, simultaneously sintering temperature, sintering time, ambient gas species, by using a sintering method to control the hydrogen concentration in the atmospheric gas, the desired particle size Ya specific surface area L i M n 0 2 particles with can efficiently manufacture child of.
- the firing temperature is low, the positive electrode active material in a fine powder state having a dense crystal structure without abnormal growth of particles can be obtained.
- FIG. 1 is an overall sectional view showing a configuration example of a grinding treatment apparatus used in a method for producing orthorhombic lithium manganese powder according to the present invention.
- FIG. 2 is a side view showing a state where a front cover of the grinding apparatus shown in FIG. 1 is removed.
- FIG. 3 is a front view illustrating a state in which a pulverizing ring is provided in the pressing body of the attrition processing apparatus shown in FIG.
- FIG. 4 is a graph showing an X-ray diffraction pattern of the lithium manganate powder according to each of Examples and Comparative Examples after the calcination treatment.
- FIG. 5 is a graph showing the relationship between the average particle size and the specific surface area of the lithium manganate powder according to each of the examples and the comparative examples after the baking treatment.
- FIG. 6 is a graph showing the relationship between the firing temperature and the specific surface area of the lithium manganate powder according to each of the examples and comparative examples after the firing treatment.
- FIG. 7 is a graph showing the relationship between the sintering temperature and the average particle diameter of the lithium manganate powder according to each of Examples and Comparative Examples after the sintering treatment.
- the hydroxide as the lithium source material (L i OH ⁇ H 2 0 : Co. Ltd. Kojundo Chemical Laboratory) and carbonates (L i 2 C0 3: manufactured by Wako Pure Chemical Industries Co., Ltd.), manganese oxide as manganese MinamotoGen fee (Mn 2 0 3: Co. Kojundo Chemical Laboratory, Ltd.) was prepared, the molar ratio between the L i source material and Mn source material (L i: Mn) is 0.5 5 Various raw material mixtures were prepared by mixing so that the ratio became 1.5: 1.5 to 0.5.
- the obtained raw material mixture was subjected to the grinding and compressing force of the grinding media using a grinding processing apparatus (dry grinding machine: Mechanomicros, manufactured by Nara Machinery Co., Ltd.) shown in FIGS.
- the milling treatment was carried out for 5 to 420 minutes so that the value was in the range of 10 to 200 G.
- the rotational speed of the vessel as a grinding treatment conditions while you with 200mi n- 1 the rotational speed of the rotor was set to 1 0 0 0 min- 1.
- the amount of mixed starting materials for the dry grinding machine Mechano Micros was set at 40.
- air, nitrogen gas or nitrogen-hydrogen mixed gas whose humidity was constantly adjusted was continuously fed into the machine at a flow rate of 10 to 100 m1 min.
- the average particle size is 0.82 to 3 ⁇ 08 in the firing temperature range of 400 to 600 ° C. and the holding time range of 20 minutes to 15 hours. It was found that the specific surface area could be controlled, and the specific surface area could be easily controlled in the range of 1.47 to 3.31 m 2 / g. It was also found that the particle diameter of the lithium manganate powder could be easily controlled by changing only the firing temperature within the firing temperature range of 300 ° C to 600 ° C.
- the orthorhombic Li the average particle diameter of mn0 2 are each 0. 9 2 zm and 2. 2 m, and can control the average particle diameter of the burned material by varying the hydrogen mixing ratio in the mixed gas.
- Example 5 when the firing temperature was changed from 400 ° C. to 500 ° C. in a nitrogen-hydrogen mixed gas atmosphere containing 4 vol.% Of hydrogen, At that time, the average particle diameter was found to change from 1.26 ⁇ m to 2.20 m. Furthermore, the specific surface area could be controlled from 2.71 ⁇ 2 / to 1.83 m 2 / g.
- Fig. 4 shows lithium manganate powders after firing treatment according to each of the examples and comparative examples.
- 3 is a graph showing an X-ray diffraction pattern of a body.
- FIG. 5 is a graph showing the relationship between the average particle size and the specific surface area of the lithium manganate powder according to each of the examples and comparative examples after the baking treatment.
- the average particle size in the range of 0.8 to 3.1 ⁇ m and the specific surface area in the range of 1.5 to 3.3 m 2 / g are obtained. That is, by adjusting the firing temperature, the atmosphere gas composition (hydrogen content), or the firing time, it is possible to easily control the average particle size and the specific surface area of the lithium manganate powder as the active material.
- the average particle size in the range of 0.8 to 3.1 ⁇ m and the specific surface area in the range of 1.5 to 3.3 m 2 / g are obtained. That is, by adjusting the firing temperature, the atmosphere
- FIG. 6 is a graph showing the relationship between the firing temperature and the specific surface area of the lithium manganate powder according to each of the examples and comparative examples after the firing treatment.
- the specific surface area was adjusted to 1.5 to 3.3 m 2 / g by adjusting the baking conditions. Is obtained as the lithium manganate powder.
- the sample fired at a temperature of 600 ° C as in Example 9 since the firing temperature was relatively high, some crystal grains became coarse and coarse, and the specific surface area decreased. A tendency was observed.
- FIG. 7 is a graph showing the relationship between the sintering temperature and the average particle size of the lithium manganate powder according to each of the examples and comparative examples after the sintering treatment.
- the average particle size was in the range of 0.8 to 3.1 ⁇ m by adjusting the baking conditions.
- a lithium manganate powder was obtained.
- the sample fired at a temperature of 600 ° C as in Example 9 since the firing temperature was relatively high, agglomeration and coarsening of some crystal particles occurred, increasing the average particle diameter. A tendency was observed.
- the positive electrode material having a strong crystal structure and excellent cycle life due to the high firing temperature was obtained. Although it is obtained, it is presumed that the battery capacity is about half of that of Example 8 and the practicability is poor.
- a sintering operation is performed at a low temperature of about 400 to 600 ° C. in a reducing atmosphere containing a predetermined amount of hydrogen. It was thereby possible to easily manufacture the orthorhombic L i Mn 0 2.
- the average particle size and specific surface area of the orthorhombic LiMnO 2 could be strictly controlled by adjusting the firing atmosphere gas, the firing temperature, and the firing time.
- a solid-phase low-temperature synthesis method mainly comprising a soft mechanochemical reaction different from the conventional solid-state reaction method is employed. and for which excellent crystalline grain size can synthesize small L iMn0 2 particles, simultaneously sintering temperature, sintering time, ambient gas species, by using a sintering method in which the control of hydrogen concentration in the atmosphere gas, desired LiMnO 2 particles having a particle diameter of ⁇ specific surface area can be efficiently produced. Further, since the firing temperature is low, the positive electrode active material in a fine powder state having a dense crystal structure without abnormal growth of particles can be obtained.
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2003/002664 WO2004078653A1 (ja) | 2003-03-06 | 2003-03-06 | 斜方晶マンガン酸リチウム粉体の製造方法 |
AU2003211757A AU2003211757A1 (en) | 2003-03-06 | 2003-03-06 | Process for producing powder of orthorhombic lithium manganate |
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PCT/JP2003/002664 WO2004078653A1 (ja) | 2003-03-06 | 2003-03-06 | 斜方晶マンガン酸リチウム粉体の製造方法 |
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WO2004078653A1 true WO2004078653A1 (ja) | 2004-09-16 |
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PCT/JP2003/002664 WO2004078653A1 (ja) | 2003-03-06 | 2003-03-06 | 斜方晶マンガン酸リチウム粉体の製造方法 |
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WO (1) | WO2004078653A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0952773A (ja) * | 1995-08-09 | 1997-02-25 | Nara Kikai Seisakusho:Kk | 複合酸化物セラミックスの製造方法 |
JP2000243399A (ja) * | 1998-12-25 | 2000-09-08 | Seiko Instruments Inc | 非水電解質二次電池 |
JP2000294242A (ja) * | 1999-04-09 | 2000-10-20 | Seimi Chem Co Ltd | 非水電解液二次電池用正極活物質、その製造方法及び非水電解液二次電池 |
-
2003
- 2003-03-06 AU AU2003211757A patent/AU2003211757A1/en not_active Abandoned
- 2003-03-06 WO PCT/JP2003/002664 patent/WO2004078653A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0952773A (ja) * | 1995-08-09 | 1997-02-25 | Nara Kikai Seisakusho:Kk | 複合酸化物セラミックスの製造方法 |
JP2000243399A (ja) * | 1998-12-25 | 2000-09-08 | Seiko Instruments Inc | 非水電解質二次電池 |
JP2000294242A (ja) * | 1999-04-09 | 2000-10-20 | Seimi Chem Co Ltd | 非水電解液二次電池用正極活物質、その製造方法及び非水電解液二次電池 |
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