CN1188921C - Acive material for cell electrode and electrode plate surface modifying techuology - Google Patents
Acive material for cell electrode and electrode plate surface modifying techuology Download PDFInfo
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- CN1188921C CN1188921C CNB021538948A CN02153894A CN1188921C CN 1188921 C CN1188921 C CN 1188921C CN B021538948 A CNB021538948 A CN B021538948A CN 02153894 A CN02153894 A CN 02153894A CN 1188921 C CN1188921 C CN 1188921C
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- 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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Abstract
The present invention provides a novel modifying technique for surfaces of active materials of battery electrodes and electrode plates for the purposes of improving the conductivity of active materials of battery electrodes and electrode plates, reducing the internal resistance of batteries, improving high-current discharging capacity of batteries and satisfying requirements of dynamic batteries. The present invention adopts a physical and chemical method to plate conducting film layers on active materials of battery electrodes and electrode plates for modifying surfaces of active materials of battery electrodes and electrode plates. Batteries modified by using the method can reduce internal resistance and improve performance in various aspects of discharge capacity, the utilization rate of active materials of electrodes, high-current discharge, etc.
Description
Technical field
The invention belongs to the battery production technical field.
Background technology
Rechargeable alkaline batteries such as MH/Ni battery are as the green battery of novel high-performance, have energy density height, no cadmium pollution, characteristics such as electric current fast charging and discharging greatly, have obtained to use widely in the small portable electronic device.Along with research work deeply and the continuous development of technology, this class battery also progressively is applied on electric tool, motor vehicle and hybrid vehicle, forms the new motive force of development.In order to satisfy the requirement of electrokinetic cell, the combination property, the especially large current discharging capability that improve battery are the task of top priority.Because battery electrode active material and pole piece conductivity can have a strong impact on its large current discharging capability, listening with the conductivity of improving electrode active material and pole piece is one of key issue that improves the high-rate battery discharge ability.
The report that at present with the method for chemical plating electrode active material particles is carried out surface modification is a lot, but does not appear in the newspapers in the research of pole piece coating surface conducting film with the method for chemical plating.Opened the patent that fair assorted grade has been applied for the positive electrode of rechargeable alkaline battery surface modification in 1997, proposed to use the method for chemical plating at Ni (OH)
2The surface coats one deck Co coating (CN 1200582A).Crane Tian Shensi in 1995 etc. have applied for the patent of surface modifying method, negative electrode battery and the alkaline rechargeable battery of hydrogen bearing alloy, hydrogen bearing alloy, and the processing method that has proposed two kinds of alloy surfaces comprises with R-X compound treatment hydrogen bearing alloy; And with etc. the element of mixed in molar ratio alloy, in vacuum, in inert gas or the nitrogen atmosphere this mixture is carried out mechanical treatment (CN 1323071A).These methods have all increased the redox reversible of electrode to a certain extent, have improved the utilance of active material, have increased discharge capacity.But these methods are with chemical method electrode active material particles to be carried out surface modification basically, and these methods are comparatively complicated on the one hand, and step is more, and cost is higher, wayward; In processing procedure, introduce impurity on the other hand easily, and treatment fluid causes environmental pollution easily.
The objective of the invention is provides a kind of battery electrode active material and pole piece process for modifying surface at above-mentioned battery electrode active material and the relatively poor problem of pole piece conductivity, thereby makes the performance of battery be more suitable for the requirement of electrokinetic cell.
Summary of the invention
Content of the present invention is achieved in that rechargeable alkaline battery electrode active material and pole piece process for modifying surface, it is characterized in that: the surface modification of electrode active material and pole piece being carried out the plating conductive film layer with the method for physics or chemistry.Need to prove that the chemical method that present technique adopts comprises: chemical plating, plating, the physical method of employing comprises: plasma sputtering, plasma vacuum multi sphere plating method, its conducting film is selected from Ag and Ni.
The electrode active material of process said method modification and pole piece be excellent performance after tested, method of testing is: the positive and negative electrode active material of modification is made pole piece, then pole piece is carried out surface modification, the pole piece of modification is reeled with barrier film, the dress shell, the KOH solution of injection 2.2～2.3g 7.2mol/L, spot welding lug, seal, can make battery.After battery is activated, the 0.2C 7h that charges, 0.2C is discharged to 1V; 0.5C charging 140min, 0.5C is discharged to 1V; The 1C 60min that charges, 1C is discharged to 1V; 0.5C charging 140min, 3C is discharged to 0.9V.This battery performance test result measures the internal resistance of this battery as shown in Figure 1 and Figure 2 simultaneously with internal resistance test device.
Fig. 1 is with the battery of method modification provided by the invention and the discharge capacity comparison diagram of battery under different discharging currents of non-modified.In Fig. 1, the A line is represented the battery capacity test curve with method modification provided by the invention, B represents the battery capacity test curve of non-modified, as seen from the figure, is higher than the discharge capacity of the battery of non-modified with the discharge capacity of the battery of method modification provided by the invention.
Fig. 2 is with the battery of method modification provided by the invention and battery discharge voltage comparison diagram when 3C (4.5A) discharges of non-modified.In Fig. 2, the A line is represented the cell voltage test curve with method modification provided by the invention, B represents the cell voltage test curve of non-modified, as seen from the figure, is higher than the discharge voltage of the battery of non-modified with the discharge voltage of the battery of method modification provided by the invention.
The internal resistance test result shows: the internal resistance with the battery of method modification provided by the invention is 18.3m Ω, and the internal resistance of unmodified battery is 26.5m Ω, and as seen the internal resistance through the battery of modification has had certain reduction.
In sum, rechargeable alkaline battery electrode active material provided by the invention and pole piece process for modifying surface, because at electrode active material and pole piece coating surface one deck conducting film, reduced the internal resistance of battery, internal resistance has reduced by 31%, improved the utilance of electrode active material, utilance has improved 12%.The battery high-rate discharge capacity of the method modification that employing the technology of the present invention provides is improved, and brings up to 1220mAh as AA battery 3C rate capability by 988mAh, and the raising of these performances makes battery be more suitable for the requirement of electrokinetic cell.Process for modifying surface provided by the invention compared with prior art, method is easy, easy operating.
Though can be with chemical method and physical method at electrode active material and pole piece surface coating, and can improve the performance of battery, chemical method is compared with physical method, causes environmental pollution easily.At present, industrial development has caused very big pollution to environment, and the serious consequence that environmental pollution brings has caused the concern of the whole society; along with development of human society; people will increase sharply to the demand of battery, and therefore, the environmental protectionization of battery production is imperative.Take all factors into consideration from environmental protection and each side, physical method is better than chemical method, is more suitable for using in industrial production.
Description of drawings
The graph of a relation 2-3C discharge voltage and the time relation of Fig. 1-discharge capacity of the cell and discharging current
Embodiment
Embodiment 1:
With AA battery positive electrode active substance and pole piece (40mm * 80mm * 0.68mm, 8.1g) negative electrode active material and pole piece (40mm * 110mm * 0.38mm, 9.8g) using plasma sputtering at its coating surface layer of metal Ag film, make the internal resistance of cell reduce by 31%, the utilance of electrode active material has improved 12%.
Embodiment 2:
With AA battery positive electrode active substance and pole piece (40mm * 80mm * 0.68mm, 8.1g), negative electrode active material and pole piece (40mm * 110mm * 0.38mm, 9.8g) plate method at its coating surface layer of metal Ni film with plasma vacuum multi sphere, make the internal resistance of cell reduce by 25%, the utilance of electrode active material has improved 10%.
Embodiment 3:
With AA battery positive electrode active substance and pole piece (40mm * 80mm * 0.68mm, 8.1g) negative electrode active material and pole piece (40mm * 110mm * 0.38mm, 9.8g) use the method for chemical plating at its coating surface layer of metal Ni film, make the internal resistance of cell reduce by 24%, the utilance of electrode active material has improved 10%.
Embodiment 4:
With AA battery positive electrode active substance and pole piece (40mm * 80mm * 0.68mm, 8.1g) negative electrode active material and pole piece (40mm * 110mm * 0.38mm, 9.8g) use electric plating method at its coating surface layer of metal Ni film, make the internal resistance of cell reduce by 20%, the utilance of electrode active material has improved 8%.
Claims (4)
1. rechargeable alkaline battery pole piece process for modifying surface is characterized in that: the surface modification of electrode active material and pole piece being carried out the plating conductive film layer with the method for physics or chemistry.
2. according to the rechargeable alkaline battery pole piece process for modifying surface described in the claim 1, it is characterized in that: the chemical method of employing comprises: chemical plating, plating.
3. according to the rechargeable alkaline battery pole piece process for modifying surface described in the claim 1, it is characterized in that: the physical method of employing comprises: plasma sputtering, plasma vacuum multi sphere plating method.
4. according to the rechargeable alkaline battery pole piece process for modifying surface described in the claim 1, it is characterized in that: its conducting film is selected from Ag and Ni.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021538948A CN1188921C (en) | 2002-12-06 | 2002-12-06 | Acive material for cell electrode and electrode plate surface modifying techuology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021538948A CN1188921C (en) | 2002-12-06 | 2002-12-06 | Acive material for cell electrode and electrode plate surface modifying techuology |
Publications (2)
| Publication Number | Publication Date |
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| CN1417875A CN1417875A (en) | 2003-05-14 |
| CN1188921C true CN1188921C (en) | 2005-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021538948A Expired - Fee Related CN1188921C (en) | 2002-12-06 | 2002-12-06 | Acive material for cell electrode and electrode plate surface modifying techuology |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255073A (en) * | 2010-11-04 | 2011-11-23 | 耿世达 | Novel technology for enhancing anode and cathode pole piece structure of lithium ion battery |
| CN103219492B (en) * | 2013-04-09 | 2015-10-28 | 中南大学 | A kind of modification lithium-ion battery manganese system's positive pole and preparation method |
| CN104795562A (en) * | 2015-05-06 | 2015-07-22 | 田东 | Preparation method of modified ternary cathode material |
| TWI631753B (en) * | 2015-12-31 | 2018-08-01 | National Taiwan University Of Science And Technology | Electrode structure |
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2002
- 2002-12-06 CN CNB021538948A patent/CN1188921C/en not_active Expired - Fee Related
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