GB2328684A - A lithium manganese oxide powder and preparation thereof - Google Patents
A lithium manganese oxide powder and preparation thereof Download PDFInfo
- Publication number
- GB2328684A GB2328684A GB9818461A GB9818461A GB2328684A GB 2328684 A GB2328684 A GB 2328684A GB 9818461 A GB9818461 A GB 9818461A GB 9818461 A GB9818461 A GB 9818461A GB 2328684 A GB2328684 A GB 2328684A
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- lithium
- manganese oxide
- lithium manganese
- powder
- positive electrode
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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
- H01M4/36—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
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
-
- 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
- C01G45/1242—Manganates or manganites with a manganese oxidation state of Mn(III), Mn(IV) or mixtures thereof of the type [Mn2O4]-, e.g. LiMn2O4, Li[MxMn2-x]O4
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/41—Particle morphology extending in three dimensions octahedron-like
-
- 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
- C01P2006/40—Electric properties
-
- 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)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
A lithium manganese oxide (LixMn2O4, where x is 1#1.05) powder has an octahedrol particle shape, and preferably has a particle size of 0.3 1 micron and is used as a positive electrode in a lithium secondary battery. In the preparation method lithium acetate and manganese acetate are dissolved in a solvent, gelatine is added to the obtained solution, and the solvent is removed to form a gel. A lithium manganese oxide powder is then formed by calcinating the gel at 300 # 500'C, and the powder is ground and sintered at 750 # 850‹C for 6 #12 hours. The lithium secondary battery adopting a positive electrode containing the lithium manganese oxide as an active material has an improved capacity characteristic and a high-rate changing/discharging characteristic.
Description
2328684 A LITHIUM MANGANESE OXIDE POWDER, PREPARATION METHOD THEREOF, AND
A LITHIUM SECONDARY BATTERY ADOPTING A POSITIVE ELECTRODE CONTAINING THE SAME AS AN ACTIVE MATERIAL The present invention relates to a lithium (Li) secondary battery, and more particularly, lithium manganese oxide in a fine powder form, a preparation method thereof, and a Li secondary battery adopting a positive electrode containing the lithium manganese oxide as an active material.
In a Li secondary battery, the charging/discharging capacity of an active material depends on the particle size of the active material and the particle structure. That is, as the particle size of the active material is smaller, the diffusion rate of Li ions increases, thereby increasing the charging/discharging capacity of a positive electrode. Also, in the case the particle structure facilitates diffusion of Li ions, the charging/discharging capacity of the positive electrode increases.
Lithium manganese oxide (LiMn,)04) has been used as a positive electrode active material in a Li secondary battery, like lithium nickel oxide (LiNiO2) and lithium cobalt oxide (LiCoO2). In particular, lithium manganese oxide has been preferred because lithium manganese oxide provides a high energy density at low costs without causing pollution.
There are various methods for preparing such positive electrode active material: two of them are as follows.
First, according to a solid solution synthesis method, lithium manganese oxide can be obtained by mixing lithium salt and manganese oxide using a ball mill and the.fi heating 1 the mixture. During the thermal process, lithium salt is decomposed and decomposed lithium ions are incorporated into the lattice - structure of manganese oxide, thereby resulting in lithium manganese oxide. Here, as the thermal process temperature and time increase, the particle size increases. Thus, it is important to appropriately control the temperature and time of the thermal process.
As another method, there is a sol-gel method which has been widely used for ceramic synthesis. Because the sol-gel method can synthesis oxides having a comparatively stable structure, the method has been used to prepare lithium metal oxide which is used as a positive electrode active material of the Li secondary battery. According to the sol-gel method, a sol-state solution containing row material and a chelate compound is prepared, and then Li and metal cation are combined with the chelate compound under appropriate conditions. Then, the chelate is decomposed and then removed through a thermal process, thereby resulting in lithium metal oxide having a stable structure. The sol-gel method results in a lithium metal oxide powder, which is finer than that obtained by the above solid solution synthesis method. However, additives (particularly, chelate compound) are expensive, and the overall process is also complicated because hydrolysis-condensation, and flocculation must be repeated.
According to a first aspect of the present invention, there is provided a lithium manganese oxide (LixMn204, where x is 1 1.05), in which the lithium manganese oxide is in a fine powder form and the particle of the powder has an octahedron shape.
Preferably, the size of the particle is 0.3 IgM, and a specific surface area thereof is 3 - 4.5m 21g.
2 According to a second aspect of the present invention, there is provided a method of preparing a fine lithium manganese oxide (LixN1n204, where x is 1 1.05) powder, comprising the steps of. (a) dissolving lithium acetate and manganese acetate in a solvent., (b) adding gelatin in the solution obtained in the step (a), and removing the solvent to form a gel; (c) forming a lithium manganese oxide powder by calcinating the gel at 300 SOCC; (d) grinding the powder and sintering the ground product at 750 8STC for 6 12 hours; and (e) cooling the sintered product.
Preferably, the particle of the fine lithium manganese oxide powder has an octahedron shape, the size of the particle is 0. 3 lgM, and the specific surface area thereof is 3 4.5m2ig.
According to a third aspect of the present invention, there is provided a lithium secondary battery including a positive electrode using a lithium metal oxide as a positive electrode active material, a carbonic negative electrode and a hydrophobic electrolyte, wherein the lithium metal oxide of the positive electrode is lithium manganese oxide (LixMn,)04, where x is 1 1.05) having octahedron particle shape.
Examples of the present invention will now be described in detail with reference to the accompanying drawings, in which: FIG. 1 is a graph showing changes in the capacity of active material according to the repeated chargings and dischargings, in a lithium (Li) secondary battery containing lithium manganese oxide sintered at 80CC for 6 hours, according to a first example of the present 20 invention (at a charging/discharging rate of 0.3Q 3 FIG. 2 is a graph illustrating a high-rate charging/discharging characteristic (1Q of the Li secondary battery containing the lithium manganese oxide sintered at 80WC for 6 hours, according to the first example of the present invention; FIG. 3 is a scanning electron microscopic photograph of a lithium manganese oxide according to a third example of the present invention; FIG. 4 is a graph illustrating changes in the capacity of active material according to repeated chargings and dischargings, in the lithium (Li) secondary battery containing lithium manganese oxide according to the third example of the present invention (at a charging/discharging rate of 0.3Q and, FIG. 5 is a graph illustrating changes in the capacity of active material according to repeated chargings and dischargings, in a lithium (Li) secondary battery containing lithium manganes e oxide according to a fourth example of the present invention.
In the present invention, gelatin is used in a process of preparing a lithium manganese oxide powder. Gelatin, a protein, has an amino group and a carbonyl group. These functional groups act as reactive sites for chelating cations. In the case of gelatin, the number of reactive sites per molecule is approximately 550 times that of citrate used as a chelate in a conventional sol-gel method. Thus, the reactivity of gelatin is very high, thereby lowering preparation costs of the positive electrode active material. When using gelatin in order to prepare the positive electrode active material by the sol-gel method, the gelatin chelates Li, as the major component of the positive electrode active material, with manganese cation, thereby stabilizing the structure of the resultant lithium manganese oxide. Because a small amount of gelatin can change inorganic cations into a gel in a frozen state, the conventional problem related to the complicated process including flocculation or hydrolysis-condensation is minimized, thereby reducing the time required for the overall synthesis process. The 4 structure determined by the gelatin is maintained after the gelatin is removed through the following calcination and sintering processes, so that most lithium manganese oxide particles have an octahedron shape, thereby increasing a specific surface area.
A method of preparing lithium manganese oxide according to the present invention will be described in detail. After dissolving lithium acetate and manganese acetate in a solvent, gelatin is added to the solution. Here, lithium acetate and lithium manganese are mixed with a mole ratio of 1:2 1.05:2, which is similar to a general ratio applied for lithium manganese oxide used as a positive electrode active material of the Li secondary battery. Preferably, the gelatin is added in amount of 5 15 Wt% based on the total amount of the lithium acetate and the lithium manganese. The effect of the present invention is not affected by the amount of gelatin. However, the above range of the gelatin provides an appropriate solubility. Also, alcohol or distilled water, preferably, methanol or ethanol, is used as the solvent.
Then, when completely dissolving the gelatin by increasing the temperature to 90 1STC, the solvent is spontaneously evaporated and removed during this process, resulting in a viscous material. By cooling the temperature to room temperature, a transparent gel is obtained. When calcinating the gel by increasing the temperature to 300SOCC, the gel is slowly solubilized at the initial stage, generating bubbles. 71en, decomposition of polymer starts. During this process, carbon dioxide and vapor are generated, thereby resulting in lithium manganese oxide powders. After grinding the lithium manganese oxide powder, a sintering process is performed for 6 12 hours while the temperature is increased to approximately 7508STC, preferably, 80TC, at a temperature increase rate of l3TIminute. Here, the sintering for 6 hours or less at 800T is not sufficient. Onthe contrary, sintering for 12 hours or more at 800T causes growth of the particles, thereby reducing a specific surface area. Also, the reduced specific surface area reduces capacity.
Then, the resultant of the sintering process. is cooled at a rate of 0. 1 2 0 C/minute, resulting in fine lithium manganese oxide powder, the particle of which has an octahedron shape, as the positive electrode active material of the present invention. The octahedron shape of the fine particle of the lithium manganese oxide powder allows easy intercalation/deintercalation of the lithium ions, thereby increasing capacity of the battery.
A positive electrode can be formed from the positive electrode active material by a general method without restrictions in the method therefor. Also, when manufacturing a Li secondary battery using the formed positive electrode, a conductor and a bonding agent, which have been widely used, are used. Acetylene black or carbon black may be used as the conductor, and polyvinyl idenfluoride may be used as the bonding agent.
Hereinafter, the present invention will be described in detail through the following examples. However, the present invention is not limited to the following examples.
Example 1
0.5M of lithium acetate (CH3COP-H20) and 0.2M of manganese acetate (CH3COI-)2Mn.4H,O) were slowly added to 50mI of methanol and completely dissolved by stirring. Then, 4g of gelatin was added to the solution, and then the mixture was heated at UTC to remove the solvent, thereby forming a gel. The gel was calcinated at 40WC to form a lithium manganese oxide (LiMn, 04) powder. Then, the powder was ground with a mortar. The ground lithium manganese oxide was sintered by increasing the temperature to approximately 80WC at a rate of I'Clmin for 6 hours, and then cooled to room temperature at a rate of 0.5'C/min, resulting a fine powdered lithium manganese oxide. The specific surface area of the obtained lithium manganese oxide was 4.5m2ig.
6 6m1 of N-methylpyrrolidone was added to a mixture containing the obtained lithium manganese oxide powder, carbon black and polyvi nylidenfluoride (88:5:7wt%) and then mixed until a paste was formed. After putting the paste in a vacuum oven to remove bubbles, the paste was coated on an aluminum foil to a thickness of 20Ogm using a doctor blade. The coated resultant was dried in a 1STC vacuum oven for 2 hours and then pressed to form a polar plate. The polar plate was cut into a 2cm-diameter circle to form a positive electrode for a coin cell. Then, lithium foil was cut into the same size as the anode, and then compressed with a nickel foil, resulting in an anode. The obtained anode is welded into a gloove box in the cap of the coin cell. Lastly, a separator (3M) and an electrolyte (ECIDNIC (ethylenecarbonateldimethylenecarbonate) + LiPF6) were incorporated, resulting in a coin cell.
The obtained coin cell was charged and discharged at a rate of 0.3C, and the result is shown in FIG. 1. As shown in FIG. 1, the initial capacity of the active material was 129mAh/g and the capacity of the active material after 30 charging/discharging cycles was nearly the same as that at 20 charging/discharging cycles.
Also, the change in capacity of the active material was measured after charging and discharging the coin cell at a high rate QC) up to 100 cycles. and the result is shown in FIG. 2.
As is evident from FIG. 2, the capacity of the active material has rather slightly increased after 80 chargings and dischargings. Also, the capacity of the active material after 100 chargings and dischargings at a high rate reaches 75% of the initial capacity of the active material. From the above result, it is obvious that a good cell having a high-rate charging/ 7 discharging characteristic can be obtained if the lithium manganese oxide of the present invention is used as a positive electrode active material of the lithium secondary battery.
ExaMle 2 4g of gelatin was completely dissolved in 5OmI of distilled water. Then, 1M of lithium acetate (CH3CO3Li.2H20) and 2M of manganese acetate ((CH3C02)2Mn.4H20) were added to the solution and completely dissolved by stirring. Then, the resultant solution was heated to WC to remove the solvent, thereby forming a gel. Other than the above, a fine powdered lithium manganese oxide (LiMn204) in a fine powder form and a lithium coin cell using the lithium manganese oxide as a positive electrode active material were fabricated by the same method as Example 1.
The charging/discharging test was performed on the obtained lithium coin cell. As a result, the capacity characteristic of the active material and a high-rate charging/discharging characteristic was good as in the result of Example 1.
Example 3
A fine powdered lithium manganese oxide was prepared by the same method as Example 1, except that the ground lithium manganese oxide was sintered at 800C for 12 hours. The specific surface area of the fine lithium manganese oxide powder was 3. 7m2/g. A photograph of the fine powder. taken by a scanning electron microscope (SEM), is shown in FIG. 3. As shown in FIG. 3, the fine powder has a octahedron shape, and the particle size is less than Igm or less.
8 A coin cell was fabricated using the lithium manganese oxide as a positive electrode active material by the same method as Example 1. Also, the charging/discharging test was on the coin cell, and the result is shown in FIG. 4.
As shown in FIG. 4, the initial capacity of the active material was 123mAhlg, which is still above a preferred capacity level. Also, the capacity of the active material was decreased as the charging/discharging cycle was repeated. However, such decrease in capacity of the active material was within an allowable range. It is believed that the reason why the initial capacity of the active material is decreased compared to Example 1 is because the specific surface area of the powder is decreased as the powders are grown with the increase of the sintering duration.
le 4 A fine lithium manganese oxide (L.05Mn204) powder was prepared and a lithium coin cell was fabricated using the lithium manganese oxide powder as a positive electrode active material. by the same method as Example 3, except that lithium acetate and manganese oxide were added with a mole ratio of 1.05:2. A charging/discharging test was performed on the lithium coin cell, and the result is shown in FIG. 5.
As shown in FIG. 5, the initial capacity of the active material was 117mAhlg, and the capacity of the active material was scarcely decreased by repeating the charging/discharging cycles.
As described above, the fine powdered lithium manganese oxide powder of the present invention has an octahedron shape and can increase the capacity due to its fineness when 9 being used as a positive electrode active material for a lithium secondary battery. Also, the lithium manganese oxide can be easily.prepated at low cost compared with the conventional case. Thus, the lithium secondary battery adopting a positive electrode containing the lithium manganese oxide as a positive electrode active material has an improved capacity characteristic and a high-rate charging/discharging characteristic, which expands the applicable range thereof.
Claims (9)
1. A lithium manganese oxide (LixMn204, where x is 1 1.05), in which the lithium manganese oxide is in a fine powder form and the particle of the powder has an octahedron shape.
2. A lithium manganese oxide according to claim 1, wherein the size of the particle is 0. 3 lgM, and a specific surface area thereof is 3 4. 5m2ig.
3. A method of preparing a fine lithium manganese oxide (LixMn204, where x is 1 1.05) powder, comprising the steps of.
(a) dissolving lithium acetate and manganese acetate in a solvent; (b) adding gelatine in the solution obtained in the step (a), and removing the solvent to form a gel; (c) forming a lithium manganese oxide powder by calcinating the gel at 300SOCC; (d) grinding the powder and sintering the ground product at 750 8STC for 6 12 hours; and, (e) cooling the sintered product.
4. A method according to claim 3, wherein the particle of the fine lithium manganese oxide powder has an octahedron shape.
5. A method according to claim 3 or 4, wherein the size of the particle is 0.3 lgM, and the specific surface area thereof is 3 4. 5 m2/g.
6. A method according to any of claims 3 to 5, wherein the solvent used in the step (a) is alcohol or distilled water.
7. The method of claim 3, wherein the content of the gelatine in the step (b) is 5 15Wt % based on the total weight of lithium acetate and manganese acetate.
8. A lithium secondary battery including a positive electrode using a lithium metal oxide as a positive electrode active material, a carbonic negative electrode and a hydrophobic electrolyte, wherein the lithium metal oxide of the positive electrode is lithium manganese oxide (LixMn204, where x isA 1.05) having octahedron particle shape.
9. A lithium secondary -battery according to claim 8, wherein the size of the particle is 0.3 lgM, and the specific surface area thereof is 3 4.5m2ig.
12
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970041170A KR100261120B1 (en) | 1997-08-26 | 1997-08-26 | Lithium manganese oxide, method for manufacturing the same and secondary lithiumion ion battery having same |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9818461D0 GB9818461D0 (en) | 1998-10-21 |
| GB2328684A true GB2328684A (en) | 1999-03-03 |
| GB2328684B GB2328684B (en) | 2000-03-29 |
Family
ID=19518678
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB9818096.1A Pending GB9818096D0 (en) | 1997-08-26 | 1998-08-19 | A lithium manganese oxide powder, preparation method thereof, and a lithium secondary battery adopting a positive electrode containing the same |
| GB9818461A Expired - Fee Related GB2328684B (en) | 1997-08-26 | 1998-08-24 | A lithium manganese oxide powder, preparation thereof, and a lithium secondary battery adopting a positive electrode containing the same as an active material |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB9818096.1A Pending GB9818096D0 (en) | 1997-08-26 | 1998-08-19 | A lithium manganese oxide powder, preparation method thereof, and a lithium secondary battery adopting a positive electrode containing the same |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH11149926A (en) |
| KR (1) | KR100261120B1 (en) |
| DE (1) | DE19837625A1 (en) |
| GB (2) | GB9818096D0 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0993058A1 (en) * | 1998-10-01 | 2000-04-12 | Ngk Insulators, Ltd. | Lithium secondary battery |
| US6881393B2 (en) | 2002-03-08 | 2005-04-19 | Altair Nanomaterials Inc. | Process for making nano-sized and sub-micron-sized lithium-transition metal oxides |
| US7547490B2 (en) | 2001-07-31 | 2009-06-16 | Altairnano Inc. | High performance lithium titanium spinel Li4Ti5012 for electrode material |
| US8420264B2 (en) | 2007-03-30 | 2013-04-16 | Altairnano, Inc. | Method for preparing a lithium ion cell |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010002210A (en) * | 1999-06-12 | 2001-01-05 | 김순택 | Positive active material for secondary battery and method of preparing thereof |
| KR100399025B1 (en) * | 2000-11-23 | 2003-09-19 | 한국과학기술원 | Preparation of lithium manganese oxide for Li-secondary battery |
| KR100490784B1 (en) * | 2002-05-27 | 2005-05-19 | 니폰 가가쿠 고교 가부시키가이샤 | Powder of lithium manganese composite oxide, manufacturing method thereof, positive electrode active material for lithium secondary batteries containing the same and lithium secondary batteries containing the same |
| KR100903610B1 (en) * | 2002-11-22 | 2009-06-18 | 삼성에스디아이 주식회사 | Method of preparing negative active material for lithium secondary battery and negative active material prepared by same |
| JP5423253B2 (en) * | 2009-08-31 | 2014-02-19 | 株式会社村田製作所 | Method for producing electrode active material |
| KR101440678B1 (en) * | 2012-08-10 | 2014-09-18 | 한국과학기술원 | Lithium manganese oxide for active material of electrode in Lithium Secondary Battery and manufacturing method for the same |
| US9905851B2 (en) | 2013-07-26 | 2018-02-27 | Lg Chem, Ltd. | Cathode active material and method of preparing the same |
| US9905850B2 (en) | 2013-07-26 | 2018-02-27 | Lg Chem, Ltd. | Polycrystalline lithium manganese oxide particles, preparation method thereof, and cathode active material including the same |
| CN104507866B (en) | 2013-07-26 | 2017-02-22 | 株式会社Lg 化学 | Anode active material and method for manufacturing same |
| CN108232154A (en) * | 2017-12-30 | 2018-06-29 | 国联汽车动力电池研究院有限责任公司 | A kind of lithium ion battery composite cathode material and preparation method thereof and lithium ion battery |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0413313A2 (en) * | 1989-08-15 | 1991-02-20 | Sanyo Electric Co., Ltd | Non-aqueous secondary cell |
| WO1996012676A1 (en) * | 1994-10-19 | 1996-05-02 | Valence Technology, Inc. | Lithium manganese oxide, method of preparation and uses thereof |
| EP0712173A1 (en) * | 1994-11-11 | 1996-05-15 | Japan Storage Battery Co., Ltd. | Positive electrode active material for nonaqueous cell and its process of preparation |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US549664A (en) * | 1895-11-12 | Apparatus for heating and lighting | ||
| JP3028582B2 (en) * | 1990-10-09 | 2000-04-04 | ソニー株式会社 | Non-aqueous electrolyte secondary battery |
| KR100378005B1 (en) * | 1997-06-30 | 2003-06-12 | 삼성에스디아이 주식회사 | Cathode active material for lithium ion battery having high capacity and stability, and method for producing the same |
-
1997
- 1997-08-26 KR KR1019970041170A patent/KR100261120B1/en not_active IP Right Cessation
-
1998
- 1998-08-19 DE DE19837625A patent/DE19837625A1/en not_active Withdrawn
- 1998-08-19 GB GBGB9818096.1A patent/GB9818096D0/en active Pending
- 1998-08-24 GB GB9818461A patent/GB2328684B/en not_active Expired - Fee Related
- 1998-08-26 JP JP10240634A patent/JPH11149926A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0413313A2 (en) * | 1989-08-15 | 1991-02-20 | Sanyo Electric Co., Ltd | Non-aqueous secondary cell |
| WO1996012676A1 (en) * | 1994-10-19 | 1996-05-02 | Valence Technology, Inc. | Lithium manganese oxide, method of preparation and uses thereof |
| EP0712173A1 (en) * | 1994-11-11 | 1996-05-15 | Japan Storage Battery Co., Ltd. | Positive electrode active material for nonaqueous cell and its process of preparation |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0993058A1 (en) * | 1998-10-01 | 2000-04-12 | Ngk Insulators, Ltd. | Lithium secondary battery |
| US7547490B2 (en) | 2001-07-31 | 2009-06-16 | Altairnano Inc. | High performance lithium titanium spinel Li4Ti5012 for electrode material |
| US6881393B2 (en) | 2002-03-08 | 2005-04-19 | Altair Nanomaterials Inc. | Process for making nano-sized and sub-micron-sized lithium-transition metal oxides |
| US8420264B2 (en) | 2007-03-30 | 2013-04-16 | Altairnano, Inc. | Method for preparing a lithium ion cell |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11149926A (en) | 1999-06-02 |
| KR100261120B1 (en) | 2000-07-01 |
| GB9818096D0 (en) | 1998-10-14 |
| KR19990018077A (en) | 1999-03-15 |
| GB9818461D0 (en) | 1998-10-21 |
| GB2328684B (en) | 2000-03-29 |
| DE19837625A1 (en) | 1999-03-04 |
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