CN2684385Y - Cathode of lithium-manganese cell - Google Patents
Cathode of lithium-manganese cell Download PDFInfo
- Publication number
- CN2684385Y CN2684385Y CN 200320116031 CN200320116031U CN2684385Y CN 2684385 Y CN2684385 Y CN 2684385Y CN 200320116031 CN200320116031 CN 200320116031 CN 200320116031 U CN200320116031 U CN 200320116031U CN 2684385 Y CN2684385 Y CN 2684385Y
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- Prior art keywords
- cathode
- lithium
- manganese
- manganese dioxide
- cell
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- Expired - Fee Related
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Abstract
The utility model discloses a cathode of a lithium-manganese cell. The utility model comprises a metal net, wherein two surfaces of the metal net are respectively rolled or coated with adhesive agent, manganese dioxide and an electric conduction agent layer. The surface of the adhesive agent, the manganese dioxide and the electric conduction agent layer is compounded with a porous protective film. The structure of the cathode greatly enhances the stability of open circuit voltage of a cell. During the process of the production, the occurrence frequency of the phenomenon of low voltage is less than 1/1000. During the process of the storage and the transportation, the phenomenon of low voltage caused by negative granules inside can not occur.
Description
Technical field
The utility model belongs to battery electrode, is specifically related to a kind of negative electrode of lithium-manganese cell.
Background technology
The performance of a lot of aspects of lithium manganese column type battery depends on the stability of manganese dioxide cathodes manufacture method structure, especially cell voltage.Existing technology is to be adhesive with the polytetrafluoroethylene, after manganese dioxide and conductive agent evenly mix, by the method for roll-in or coating, will mix negative electrode and be pressed together on the wire netting.
Polytetrafluoroethylene is a kind of network structure in cathode systems, and the manganese dioxide of powdery and conductive agent particle link up by this netted tetrafluoroethene.This network structure can produce defective inevitably in the form process.Therefore always have part solid manganese dioxide particle and spin off, be free in the space of entire cell from cloudy surface.In case these particles contact with anode lithium or stab out barrier film, battery can produce self discharge.Battery reduces at the open circuit voltage of depositing, occurring in the transportation, even loses efficacy, and is exactly that this reason causes.
Because defective ubiquity in present lithium battery production technology of above-mentioned mixing negative electrode, and the uncertainty of the time that the voltage that this defective causes reduces (detection of qualified products and control cause operability poor, will inevitably cause substandard product can flow to the user.) low-voltage battery of 5-10% usually can appear in process of production, and the low-voltage phenomenon irregularly appears in subsequently storage and transportation.These problems are troubling manufacturer and user for a long time always.
Summary of the invention
The purpose of this utility model is to provide a kind of negative electrode of lithium-manganese cell, to avoid the problems referred to above.
The technical solution of the utility model is: the negative electrode of lithium-manganese cell comprises wire netting, and wire netting two surperficial roll-ins or be coated with adhesive, manganese dioxide and conductive agent layer have the porous protective film in the surface recombination of adhesive, manganese dioxide and conductive agent layer.
This cathode construction has improved the stability of the open circuit voltage of battery widely.The low-voltage phenomenon low-voltage phenomenon that causes because of the cloudy particle in inside can not occur below 1 ‰ yet in the production process in storage and transportation.
Description of drawings
The cathode construction schematic diagram of accompanying drawing lithium-manganese cell
Embodiment
As shown in Figure 1, wire netting is an aluminium net 1,1 liang of surperficial roll-in of aluminium net or be coated with adhesive, manganese dioxide and conductive agent layer 2, and the surface recombination of adhesive, manganese dioxide and conductive agent layer 2 has porous protective film 3.
Porous protective film 3 must satisfy following requirements: 1. can organic solvent-resistant, and not dissolved or swelling in organic electrolysis pressure system.2. can be high temperature resistant, can fusing in negative electrode high temperature dehydration process, carbonization, distortion.3. have abundant hole, guarantee freely passing through of ion.4. have suitable thickness, make it both have suitable intensity, can not influence the capacity of battery again simultaneously, can adopt cotton paper or other to meet the material of above-mentioned requirements because of occupying too many volume.
The thickness of the film of this porous is 50～200 μ m.In the manufacture process of negative electrode, the method by roll-in is pressed together on the cathodic coating surface, at suitable pressures, through roll-in the film of cathode surface and free powder is embedded in the loose structure of film.
Like this; name in the cathode systems plants component and the top layer perforated membrane forms an intact integral body; those can be by the top layer film absorption of loose structure by the fine bonding particle of polytetrafluoroethylene; and the top layer has particle detachment never again, fundamentally solved by the harm of those powders to battery.
Claims (3)
1, a kind of Cathode of lithium-manganese cell, it comprises wire netting, wire netting two surperficial roll-ins or be coated with adhesive, manganese dioxide and conductive agent layer is characterized in that in the surface recombination of adhesive, manganese dioxide and conductive agent layer the porous protective film being arranged.
2, Cathode of lithium-manganese cell according to claim 1 is characterized in that described protecting film is a cotton paper.
3, Cathode of lithium-manganese cell according to claim 1 is characterized in that the thickness of described protecting film is: 50～200 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320116031 CN2684385Y (en) | 2003-11-27 | 2003-11-27 | Cathode of lithium-manganese cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320116031 CN2684385Y (en) | 2003-11-27 | 2003-11-27 | Cathode of lithium-manganese cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2684385Y true CN2684385Y (en) | 2005-03-09 |
Family
ID=34599498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320116031 Expired - Fee Related CN2684385Y (en) | 2003-11-27 | 2003-11-27 | Cathode of lithium-manganese cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2684385Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100344017C (en) * | 2005-05-25 | 2007-10-17 | 厦门大学 | Method for preparing MnO2/silver composite cathode of Li-Mn cell |
| CN102456925A (en) * | 2010-10-21 | 2012-05-16 | 力佳电源科技(深圳)有限公司 | Method for preparing softly coated lithium manganese battery |
| CN109786661A (en) * | 2019-01-14 | 2019-05-21 | 天能电池集团有限公司 | A kind of lithium battery pole slice and its preparation method and application of full-filling conductive agent |
-
2003
- 2003-11-27 CN CN 200320116031 patent/CN2684385Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100344017C (en) * | 2005-05-25 | 2007-10-17 | 厦门大学 | Method for preparing MnO2/silver composite cathode of Li-Mn cell |
| CN102456925A (en) * | 2010-10-21 | 2012-05-16 | 力佳电源科技(深圳)有限公司 | Method for preparing softly coated lithium manganese battery |
| CN102456925B (en) * | 2010-10-21 | 2014-09-24 | 力佳电源科技(深圳)有限公司 | Method for preparing softly coated lithium manganese battery |
| CN109786661A (en) * | 2019-01-14 | 2019-05-21 | 天能电池集团有限公司 | A kind of lithium battery pole slice and its preparation method and application of full-filling conductive agent |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050309 Termination date: 20111127 |