GB2329755A - A method of preparing a positive electrode for nickel-based battery and a slurry composition for the same - Google Patents
A method of preparing a positive electrode for nickel-based battery and a slurry composition for the same Download PDFInfo
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- GB2329755A GB2329755A GB9820992A GB9820992A GB2329755A GB 2329755 A GB2329755 A GB 2329755A GB 9820992 A GB9820992 A GB 9820992A GB 9820992 A GB9820992 A GB 9820992A GB 2329755 A GB2329755 A GB 2329755A
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- Prior art keywords
- cobalt
- active material
- positive active
- hydroxide
- material slurry
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/24—Electrodes for alkaline accumulators
- H01M4/26—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/24—Alkaline accumulators
- H01M10/28—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/24—Alkaline accumulators
- H01M10/30—Nickel accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/34—Gastight accumulators
- H01M10/345—Gastight metal hydride accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0416—Methods of deposition of the material involving impregnation with a solution, dispersion, paste or dry powder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/626—Metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
A positive electrode for a nickel-based battery is prepared by mixing a nickel hydroxide powder containing nickel hydroxide, a cobalt compound and a viscosity increasing agent with an alkaline solution to form a positive active material slurry, agitating the positive active material slurry at a temperature ranging from 50 to 150‹C for a time period of 0.5 to 2 hours, and applying the agitated positive active material slurry onto a substrate.
Description
2329755 A METHOD OF PREPARING A POSITIVE ELECTRODE FOR NICKELBASED BATTERY
AND A SLURRY COMPOSITION FOR THE SAME
CROSS REFERENCE TO RELATED APPLICATION
This application claims priority to Korean patent application No. 9748988 filed September 26, 1997, the content of which is incorporated herein by reference as if set forth in full.
BACKGROUND OF THE INVENTION (a) Field of the Invention
The present invention relates to a positive electrode for a nickel-based battery and a method of preparing the same and, more particularly, to a positive electrode preparing method which does not require an aging process and an electrochemical oxidation process.
(b) Description of the Related Art
Generally, nickel based batteries use nickel hydroxide for the positive electrode active material. Since nickel hydroxide exhibits a lower conductivity, a cobalt compound such as Co, CoO, CoOOH, C0203, C03041 COSO4and COC12 is usually applied thereto as the conductive agent. For example, during the positive active material preparing process, cobalt hydroxide may be co precipitated with nickel hydroxide, or simply added thereto. Furthermore, in order to stabilize the structure of nickel hydroxide and increase its conductivity, zinc, calcium, magnesium and manganese may be co-precipitated with nickel hydroxide in addition to the cobalt compound.
Thereafter, nickel hydroxide applied with cobalt hydroxide is mixed with water to prepare a positive active material slurry. The positive active material slurry is applied onto a substrate and dried to prepare a positive electrode. The resulting positive electrode is assembled with a negative electrode while interposing an alkali electrolyte to fabricate a nickel based cell. The negative electrode may be formed with cadmium or a hydrogen storage metal alloy.
After the cell fabrication, the process of converting cobalt hydroxide into cobalt oxyhydroxide should be performed to form a conductive network on the surface of the positive active material. This conductive network enhances conductivity of the positive active material.
First, cobalt hydroxide added into nickel hydroxide dissolves in the alkali electrolyte and elutes on the surface of the positive active material through an aging process. The cobalt hydroxide eluted on the surface of the positive active material is then converted into cobalt oxyhydroxide through an electrochemical oxidation reaction process. In this way, a conductive network is formed on the surface of the positive active material. Usually, the aging process is performed by allowing the cell to stand at a high temperature of about 801C for a time period of one to two days. The electrochemical oxidation process is performed by low rate charge and discharges of the cell.
However, with the above-described method, the aging process and the electrochemical oxidation process performed after the cell fabrication require a long time up to two days. This means that a cumbersome and inefficient work should be taken. Furthermore, these processes are liable to lower a cycle life and an available capacity of the resulting cell.
SUMMARY OF THE INVENTION
2 It is an object of the present invention to provide a positive electrode suitable for enhancing the life cycle and available capacity characteristics of a nickel-based battery.
It is another object of the present invention to provide a method of preparing a positive electrode for a nickel-based cell which does not require an aging process and an electrochemical oxidation process.
In order to achieve these objects and others, the present invention provides a positive electrode for a nickel-based battery using a positive active material slurry including nickel hydroxide, a cobalt compound, a viscosity increasing agent, and an alkaline solution.
According to one aspect of the present invention, a method of preparing the positive electrode for a nickel-based battery is performed by mixing a nickel hydroxide powder containing nickel hydroxide, a cobalt compound and a viscosity increasing agent with an alkaline solution to form a positive active material slurry, agitating the positive active material slurry at a temperature ranging from 50 to 150 IC for a time period of 0.5 to 2 hours, and applying the agitated positive active material slurry onto a substrate.
According to another aspect of the present invention, a method of preparing the positive electrode for a nickel-based battery is performed by applying a positive active material slurry containing nickel hydroxide, a cobalt compound, a viscosity increasing agent and water onto a substrate, and treating the positive active material slurry with an alkaline solution.
BRIEF DESCRIPTION OF THE DRAWINGS
A more complete appreciation of the invention, and many of the 3 attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawing, wherein:
Fig. 1 is a graph illustrating voltages of the cells of Example 1 and Comparative Example 1 at their initially charged states as a function of time.
DETAILED DESCRIPTION OF THE INVENTION
It is known that the cobalt compound used as a conductive agent for a nickel-based cell such as a nickel-metal hydride cell and a nickelcadmium cell usually dissolves in an alkaline solution in the form of (Co(OH),,) - ' and exists with a form of Co(O1-1)2. As shown in Formula 1, Co(O1-1)2 suffers oxidation reaction in the presence of OH - and is converted into CoOOH.
Formula 1:
Co(O1-1)2+OW- CoOOH+H2o+e E0=0.17V Conventionally, the chemical reaction operation of Formula 1 is performed by the aging process and the electrochemical process after the cell fabrication. However, with the present invention, the cobalt compound is oxidized into cobalt oxyhydroxide at the preparation of the positive active material slurry so that it is no longer required to perform the aging and electrochemical oxidation processes after the cell fabrication.
According to one aspect of the present invention, a cobalt compound, such as cobalt, cobalt oxide and cobalt hydroxide, for the conductive agent is first added into nickel hydroxide to form a mixed nickel hydroxide powder. At this time, it is preferable that metals such as zinc, cobalt, magnesium, manganese, cadmium or calcium are co-precipitated with nickel hydroxide.
4 The weight ratio of the cobalt compound is preferably 2 to 10 weight percent based on the total mixed nickel hydroxide powder. When the weight ratio is less than 2 weight percent, the resulting positive electrode exhibits relatively lower conductivity so that its available capacity is reduced. When the weight ratio exceeds 10 weight percent, the amount of the nickel hydroxide component is obliged to be reduced so that the cell capacity decreases.
In order to enhance viscosity of the mixed nickel hydroxide power, a viscosity increasing agent is added thereto. The amount of the viscosity increasing agent added is controlled such that the mixed nickel hydroxide powder can be provided with a viscosity enough to be coated on the entire portion of a positive substrate. Preferably, it is added by 0.5 weight percent of the mixed nickel hydroxide powder. The viscosity increasing agent may include hydroxy propyl methyl cellulose or methyl cellulose.
Thereafter, an alkaline solution is added to the mixed nickel hydroxide powder such that the resulting nickel hydroxide slurry is provided with a total moisture content of 20 to 30 weight percent. The alkaline solution can be prepared by dissolving an alkali compound such as potassium hydroxide, sodium hydroxide and lithium hydroxide into deionized water. The alkali compound is preferably 1 to 5 weight percent based on the alkaline solution. When the weight ratio of the alkali compound is less than 1 weight percent, the conversion of the cobalt compound into cobalt oxyhydroxide is not sufficiently made so that it becomes difficult to obtain desired conductivity. When the weight ratio of the alkali compound exceeds 5 weight percent, the resulting positive active material loses a binding strength with the substrate in the alkaline electrolyte and may be detached from the substrate.
The resulting positive active material slurry is then agitated at a temperature ranging from 50 to 150Cfor a time period of 0.5 to 2 hours. The agitated positive active material slurry is applied onto a nickel foam substrate and dried to prepare a positive electrode. When the agitation operation is performed out of the above-identified conditions, the cobalt compound cannot be satisfactorily converted into cobalt oxyhydroxide.
According to another aspect of the present invention, a positive active material slurry containing nickel hydroxide, a cobalt compound, a viscosity increasing agent and water is first applied onto a nickel foam substrate and then treated with an alkaline solution. At this time, the substrate applied with the positive active material slurry preferably allows to stand in the hermetically sealed space for 0.5 to 2 hours on condition that the relative humidity of the alkaline solution is kept to be 60 to 100% and the atmospheric temperature is in the range of 60 to 1001C. Out of the conditions, the conversion of the cobalt compound into cobalt oxyhydroxide is not sufficiently made. The alkaline solution is prepared by dissolving an alkali compound such as potacium hydroxide, sodium hydroxide and lithium hydroxide into deionized water. The weight ratio of the alkali compound dissolved in the alkaline solution is preferably 20 to 35 weight percent. When the weight ratio of the alkali compound is less than 20 weight percent, the CoOOH conductive network is not sufficiently formed so that the available cell capacity is reduced. In contrast, when the weight ratio of the alkali compound exceeds 35 weight percent, an additional water-cleaning process should be introduced, resulting in 6 reduced production efficiency.
EXAMPLE1
A nickel hydroxide powder containing 3 weight percent of zinc and 3 weight percent of cobalt was mixed with 5 weight percent of cobalt oxide and 0.5 weight percent of hydroxy propyl methyl cellulose to form a mixed nickel hydroxide powder. A solution of 2 weight percent of potassium hydroxide was added into the mixed nickel hydroxide powder to form a mixed nickel hydroxide slurry having a moisture content of 27.5 weight percent. The mixed nickel hydroxide slurry was poured into a rotary mixer and agitated at 11001C for an hour. At this time, the color of the agitated solution was changed from green to pale brown. The resulting nickel hydroxide slurry was applied onto a nickel foam substrate and dried to prepare a positive electrode.
The negative active material slurry was prepared by mixing AB5 based hydrogen storage metal alloy for the active material, ketjen black for the conductive agent, styrene butadiene rubber for the binder, carboxy methyl cellulose for the viscosity increasing agent, and water for the solvent. This slurry was applied onto a substrate and dried to prepare a negative electrode.
The positive and negative electrodes interposing a separator were wound centering around a winding axis and inserted into a cell container. A solution of 31 weight percent of potassium hydroxide for an electrolyte was injected into the cell container and assembled to prepare a cell.
EXAMPLE2
A positive active material slurry was prepared by mixing 3,000 g of nickel hydroxide for the active material, 25g of cobalt oxide for the conductive 7 agent, 16g of hydroxy propyl methyl cellulose for the viscosity increasing agent, and 615g of water for the solvent. This slurry was applied onto a nickel foam substrate and dried to prepare a positive electrode. The positive electrode allowed to stand at WC for 15 hours under the alkali atmosphere by using a solution of 30 weight percent of potassium hydroxide and controlling its humidity to be 90 percent. A cell was prepared with the resulting positive electrode by the method of Example 1.
COMPARATIVE EXAMPLE 1 A nickel hydroxide powder containing 3 weight percent of zinc and 3 weight percent of cobalt was mixed with 5 weight percent of cobalt oxide and 0.5 weight percent of hydroxy propyl methyl cellulose to form a mixed nickel hydroxide powder. Water was added into the mixed nickel hydroxide powder to form a mixed nickel hydroxide slurry having a moisture content of 27.5 weight percent. The mixed nickel hydroxide slurry was applied onto a nickel foam substrate and dried to prepare a positive electrode. A cell was prepared with the positive electrode by the method of Example 1. The cell allowed to stand at 80 IC for two days.
COMPARATIVE EXAMPLE 2 A positive active material slurry was prepared by mixing 3,000 g of nickel hydroxide for the active material, 25g of cobalt oxide for the conductive agent, 16g of hydroxy propyl methyl cellulose for the viscosity increasing agent, and 615g of water for the solvent. This slurry was applied onto a nickel foam substrate and dried to prepare a positive electrode. A cell was prepared with the positive electrode by the method of Example 1. The cell allowed to stand 8 at 80 IC for two days.
Fig. 1 is a graph illustrating voltages of the cells of Example 1 and Comparative Example 1 when the cells are charged by 150% at 0.1C. As shown in Fig. 1, with the cell of Example 1, since a conductive network of cobalt oxyhydroxide was formed during the positive active material slurry preparing process, the potential of cobalt hydroxide around 0.8V to 1.OV is not generated at the initial charge, but only the oxidation reaction of nickel hydroxide was observed. On the contrary, with the cell of Comparative Example 1, the formation region of cobalt oxyhydroxide around 0.8V to 1.OV was observed at the initial charge. Therefore, in order to form a cobalt oxyhydroxide conductive network, the cell of Comparative Example 1 should necessarily pass the electrochemical oxidation process after the cell fabrication.
Furthermore, the cycle life characteristics of the cells of Example 1 and Comparative Example 1 were measured in the following way.
The cell of Comparative Example 1 was charged by 150% at 0.1 C and again cut-off discharged by 1.OV at 0.2C with a relaxing term of one hour.
Thereafter, the cells of Example 1 and Comparative Example 1 were recharged with a cut-off voltage of LN= - 10 W and cut-off discharged by 1V at 1C with a relaxing time of 30 minutes. The charge and discharge processes were repeated by 500 times and then the cell capacity was measured. The capacity of the cell of Example 1 exhibited 85% of the initial capacity while the capacity of the cell of Comparative Example 1 exhibited 83% of the initial capacity.
Therefore, it can be known that the cell of Example 1 has a better cycle life characteristic compared to that of Comparative Example 1.
9 Furthermore, the cycle life and the available capacity of the cells of Example 2 and Comparative Example 2 were measured and the results are shown in Table 1.
Table 1
Available capacity of Cell capacity (500 positive active material cycles) Cell of Example 2 103.1% 87.5% of initial capacity Cell of Comparative 101.1% 75.2% of initial capacity Example 2
The available capacity of the positive active material was determined by the following division: (practical discharge capacity at 0.2C X 100(%)) 1 (theoretical electrochemical reaction capacity of nickel hydroxide).
As shown in Table 1, the available capacity of the cell of Example 2 is improved by 2% compared to that of Comparative Example 2. The cell capacity of Example 2 has a better life cycle characteristic compared to that of Comparative Example 2. Furthermore, with the present invention, since the aging process and the electrochemical oxidation process after the cell fabrication may be omitted, the time for fabricating the cell can be reduced by 1.5 day compared to the conventional cell fabrication.
While the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that various modifications and substitutions can be made thereto without departing from the spirit and scope of the present invention as set forth in the appended claims.
11
Claims (17)
1. A method of preparing a positive electrode for a nickel-based battery, the method comprising the steps of:
mixing a nickel hydroxide powder containing nickel hydroxide, a cobalt compound and a viscosity increasing agent with an alkaline solution to form a positive active material slurry; agitating the positive active material slurry at a temperature ranging from 50 to 150C for a time period of 0.5 to 2 hours; and applying the agitated positive active material slurry onto a substrate.
2. The method of claim 1 wherein the cobalt compound is selected from the group consisting of cobalt, cobalt oxide and cobalt hydroxide.
3. The method of claim 1 wherein the nickel hydroxide powder comprises 2 to 10 weight percent of the cobalt compound.
4. The method of claim 1 wherein the alkaline solution comprises at least one alkali compound selected from the group consisting of potassium hydroxide, sodium hydroxide and lithium hydroxide.
5. The method of claim 4 wherein the alkaline solution comprises 1 to 5 weight percent of the alkali compound.
6. The method of claim 1 wherein the positive active material slurry has a total moisture content of 20 to 30 weight percent.
7. The method of claim 1 wherein the viscosity increasing agent is selected from the group consisting of hydroxy propyl methyl cellulose and methyl cellulose.
8. The method of claim 1 wherein the nickel hydroxide is co- 12 precipitated with at least one material selected from the group consisting of zinc, cobalt, magnesium, manganese, cadmium and calcium.
9. A method of preparing a positive electrode for a nickel-based battery, the method comprising the steps of:
applying a positive active material slurry containing nickel hydroxide, a cobalt compound, a viscosity increasing agent and water onto a substrate; and treating the positive active material slurry with an alkaline solution.
10. The method of claim 9 wherein the cobalt compound is selected from the group consisting of cobalt, cobalt oxide and cobalt hydroxide.
11. The method of claim 9 wherein the step of treating the positive active material slurry with the alkaline solution is performed by allowing to stand the substrate applied with the positive active material slurry in a hermetically sealed space for 1 to 24 hours on condition that the relative humidity of the alkaline solution is kept to be 60 to 100% and the atmospheric temperature is in the range of 60 to 100 IC.
12. The method of claim 11 wherein the alkaline solution comprises at least one alkali compound selected from the group consisting of potassium hydroxide, sodium hydroxide and lithium hydroxide.
13. The method of claim 11 wherein the alkaline solution comprises 20 to 35 weight percent of the alkali compound.
14. A positive active material slurry for a nickel-based battery comprising:
nickel hydroxide; a cobalt compound; 13 a viscosity increasing agent; and an alkaline solution.
15. The positive active material slurry of claim 14 wherein the nickel hydroxide is co-precipitated with at least one material selected from the group consisting of zinc, cobalt, magnesium, manganese, cadmium and calcium, and wherein the cobalt compound is selected from the group consisting of cobalt, cobalt oxide and cobalt hydroxide.
16. The positive active material slurry of claim 14 wherein the alkaline solution comprises at least one alkali compound selected from the group consisting of potassium hydroxide, sodium hydroxide and lithium hydroxide.
17. The positive active material slurry of claim 16 wherein the alkaline solution comprises 1 to 5 weight percent of the alkali compound.
14
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970048988A KR19990026737A (en) | 1997-09-26 | 1997-09-26 | How to Form a Cathode Conductive Network for Nickel-based Batteries |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9820992D0 GB9820992D0 (en) | 1998-11-18 |
| GB2329755A true GB2329755A (en) | 1999-03-31 |
Family
ID=19521742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9820992A Withdrawn GB2329755A (en) | 1997-09-26 | 1998-09-25 | A method of preparing a positive electrode for nickel-based battery and a slurry composition for the same |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH11162461A (en) |
| KR (1) | KR19990026737A (en) |
| DE (1) | DE19844158A1 (en) |
| GB (1) | GB2329755A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1372201A1 (en) * | 2001-02-26 | 2003-12-17 | FDK Corporation | Alkaline primary battery |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001332257A (en) * | 1999-10-08 | 2001-11-30 | Hitachi Maxell Ltd | Non-baking type positive electrode for alkaline battery, its manufacturing method and the alkaline battery using the non-baking type positive electrode |
| US9997777B2 (en) * | 2013-06-20 | 2018-06-12 | The Regents Of The University Of Michigan | Electrochemical device electrode including cobalt oxyhydroxide |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1426708A (en) * | 1973-08-13 | 1976-03-03 | Varta Batterie | Positive electrode for an alkaline accumulator |
| EP0757395A1 (en) * | 1995-07-31 | 1997-02-05 | Sanyo Electric Co., Ltd. | A non-sintered nickel electrode, an alkaline storage cell and manufacturing method |
| EP0757726A1 (en) * | 1994-04-12 | 1997-02-12 | Henkel Corporation | Method of pre-treating metal substrates prior to painting |
-
1997
- 1997-09-26 KR KR1019970048988A patent/KR19990026737A/en not_active Application Discontinuation
-
1998
- 1998-09-24 JP JP10269505A patent/JPH11162461A/en active Pending
- 1998-09-25 DE DE19844158A patent/DE19844158A1/en not_active Withdrawn
- 1998-09-25 GB GB9820992A patent/GB2329755A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1426708A (en) * | 1973-08-13 | 1976-03-03 | Varta Batterie | Positive electrode for an alkaline accumulator |
| EP0757726A1 (en) * | 1994-04-12 | 1997-02-12 | Henkel Corporation | Method of pre-treating metal substrates prior to painting |
| EP0757395A1 (en) * | 1995-07-31 | 1997-02-05 | Sanyo Electric Co., Ltd. | A non-sintered nickel electrode, an alkaline storage cell and manufacturing method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1372201A1 (en) * | 2001-02-26 | 2003-12-17 | FDK Corporation | Alkaline primary battery |
| EP1372201A4 (en) * | 2001-02-26 | 2008-06-18 | Fdk Corp | Alkaline primary battery |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19844158A1 (en) | 1999-04-01 |
| KR19990026737A (en) | 1999-04-15 |
| GB9820992D0 (en) | 1998-11-18 |
| JPH11162461A (en) | 1999-06-18 |
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| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |