CN111326713A - Power battery cathode material and preparation method thereof - Google Patents
Power battery cathode material and preparation method thereof Download PDFInfo
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- CN111326713A CN111326713A CN202010102801.4A CN202010102801A CN111326713A CN 111326713 A CN111326713 A CN 111326713A CN 202010102801 A CN202010102801 A CN 202010102801A CN 111326713 A CN111326713 A CN 111326713A
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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
- H01M4/14—Electrodes for lead-acid accumulators
- H01M4/16—Processes of manufacture
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/06—Lead-acid accumulators
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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
- H01M4/362—Composites
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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
- H01M4/56—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of lead
- H01M4/57—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of lead of "grey lead", i.e. powders containing lead and lead oxide
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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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
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to the technical field of battery preparation, and particularly discloses a power battery cathode material and a preparation method thereof. The negative electrode material of the power battery comprises lead powder, dilute sulfuric acid, water, sodium lignosulphonate, humic acid, carbon black and barium sulfate. The preparation method comprises the following steps: (1) mixing sodium lignosulphonate, humic acid, carbon black and barium sulfate to obtain a negative electrode bag mixture; (2) performing ball milling on the negative electrode bag mixture for 5-60 min to obtain a ball-milled negative electrode bag; (3) and mixing the ball-milled negative electrode package with lead powder, dilute sulfuric acid and water, and adding the mixture into a paste mixer to neutralize paste to obtain the negative electrode material of the power battery. The negative electrode material of the power battery prepared by the method can fully disperse the raw material lead powder and the components in the ball-milled negative electrode package, thereby improving the low-temperature capacity performance of the power battery.
Description
Technical Field
The invention relates to the technical field of battery material preparation, in particular to a power battery cathode material and a preparation method thereof.
Background
The power battery is a power supply for providing power for tools such as an electric automobile and the like; the lead-acid storage battery is one of the commonly used power batteries, and comprises a positive electrode, a negative electrode, a diaphragm and electrolyte. The negative electrode of the lead-acid battery is a lead plate filled with spongy lead, the negative electrode material of the lead-acid battery generally contains components such as lead powder, sodium lignosulfonate (dispersing agent), barium sulfate (nucleating agent), carbon black (conductive material) and the like, the components, water, sulfuric acid and the like are added into a paste mixer (horizontal low-speed stirring mixer) for neutralization to form a negative electrode material at one time, and then the negative electrode material is coated to form a negative electrode green plate.
The traditional mixing method of the paste mixer has the defects that the components are not uniformly mixed, the compounds such as barium sulfate, lead powder and the like are heavy, the lignin is light, and the carbon black is lighter, the carbon black which is thrown (with small bulk density) cannot be mixed into the mixture by the mixing method, so that agglomeration and uneven distribution are serious, black lines appear as soon as a mould forming scraper scrapes, the nucleating agent barium sulfate of about several microns cannot be dispersed and distributed by lignin which is not well dispersed, the nucleating effect of the barium sulfate cannot be well played, and the lead sulfate is seriously salted. And the consistency of the negative electrode of the lead-acid battery is poor, the cycle charging and discharging consistency, the low-temperature capacity and the high-temperature resistance of the whole lead-acid battery product are poor, and the service life of the final battery is short. Wherein, the low-temperature capacity is an important index for power battery investigation; therefore, the power battery cathode material with excellent low-temperature capacity performance is provided, and has important significance for improving the performance of the power battery.
Disclosure of Invention
The invention aims to solve the technical problem of providing a power battery cathode material and a preparation method thereof. The battery cathode material prepared by the invention has excellent low-temperature capacity performance.
The technical problem to be solved by the invention is realized by the following technical scheme:
a negative electrode material of a power battery comprises lead powder, dilute sulfuric acid, water, sodium lignosulphonate, humic acid, carbon black and barium sulfate; wherein, taking the weight of the lead powder as a measurement standard, the weight and the dosage of each component are respectively as follows: 8-15% of dilute sulfuric acid, 10-20% of water, 0.1-1% of sodium lignosulfonate, 0.1-1% of humic acid, 0.1-1% of carbon black and 0.5-1.5% of barium sulfate.
Preferably, the weight of the lead powder is taken as a metering standard, and the weight amounts of the components are respectively as follows: 8-12% of dilute sulfuric acid, 10-15% of water, 0.1-0.5% of sodium lignosulfonate, 0.1-0.5% of humic acid, 0.1-0.5% of carbon black and 0.5-1.5% of barium sulfate.
Preferably, the dilute sulfuric acid is dilute sulfuric acid with the concentration of 1.0-2.0 g/mL.
The preparation method of the power battery negative electrode material comprises the following steps:
(1) mixing sodium lignosulphonate, humic acid, carbon black and barium sulfate to obtain a negative electrode bag mixture;
(2) performing ball milling on the negative electrode bag mixture for 5-60 min to obtain a ball-milled negative electrode bag;
(3) and mixing the ball-milled negative electrode package with lead powder, dilute sulfuric acid and water, and adding the mixture into a paste mixer to neutralize paste to obtain the negative electrode material of the power battery.
In the preparation process of the battery cathode material, firstly, the components such as sodium lignosulphonate, humic acid, carbon black, barium sulfate and the like are taken out and dispersed separately to form a ball-milling cathode bag; and then, the negative electrode package is mixed with lead powder, dilute sulfuric acid and water in the process of mixing the negative electrode of the lead-acid battery with paste, so that the components in the raw material lead powder and the ball-milling negative electrode package can be fully dispersed, and the low-temperature capacity performance of the power battery is improved.
Preferably, the mixing in step (1) is carried out in a mixer; and (3) performing ball milling in a ball mill in the step (2).
Preferably, the grinding medium in the ball mill is selected to have a density of 2.7-9 g/cm3The metal balls and/or metal oxide ceramic balls of (a); the volume filling rate of the grinding medium in the ball mill is 20-60%.
Further preferably, the metal ball is selected from 304 stainless steel balls; the metal oxide ceramic ball is selected from a zirconium dioxide ceramic ball or an aluminum oxide ceramic ball.
Preferably, the grinding media in the ball mill are graded by metal balls and/or metal oxide ceramic balls with three sizes; respectively are metal balls or metal oxide ceramic balls with the diameter of 2-15 mm; metal balls or metal oxide ceramic balls with the diameter of 15-50 mm; metal balls or metal oxide ceramic balls with a diameter of 50-100 mm.
More preferably, the weight ratio of the metal balls or metal oxide ceramic balls with the diameter of 2-15 mm to the metal balls or metal oxide ceramic balls with the diameter of 15-50 mm to the metal balls or metal oxide ceramic balls with the diameter of 50-100 mm is 1-50: 1-50: 1-50;
more preferably, the weight ratio of the metal balls or metal oxide ceramic balls with the diameter of 2-15 mm to the metal balls or metal oxide ceramic balls with the diameter of 15-50 mm to the metal balls or metal oxide ceramic balls with the diameter of 50-100 mm is 1-5: 1-5: 1-5;
most preferably, the grinding media in the ball mill are graded by selecting metal balls and/or metal oxide ceramic balls with three sizes; 304 stainless steel balls with the diameter of 2-15 mm are respectively arranged; zirconium dioxide ceramic balls with the diameter of 15-50 mm; alumina ceramic balls with the diameter of 50-100 mm; the weight ratio of the 304 stainless steel balls to the zirconium dioxide ceramic balls to the aluminum oxide ceramic balls is 3-5: 1-2: 1.
the inventor further researches and discovers that the ball milling step is crucial in the preparation process, even though the technicians in the field can think that the components such as sodium lignosulphonate, humic acid, carbon black, barium sulfate and the like are taken out and dispersed separately to form a ball milling negative electrode bag; however, if only the components such as sodium lignosulfonate, humic acid, carbon black and barium sulfate are mixed by a common mixer, a high-speed mixer, a horizontal coulter mixer and the like, the components in the negative electrode bag are still not well mixed because the carbon black is too light and has too large difference with the bulk density of the sodium lignosulfonate and the barium sulfate, and the components in the negative electrode bag are still layered and agglomerated after being mixed by the mixers, and the carbon black cannot be distributed and dispersed into other two components. In order to ensure that the components in the negative electrode package can be fully dispersed, the inventor finds that the ball-milled negative electrode package with excellent dispersion performance can be obtained only by carrying out ball milling on the components such as sodium lignosulfonate, humic acid, carbon black, barium sulfate and the like in the negative electrode package through a horizontal colter mixer and then a ball mill.
After one step, if a person skilled in the art can think that a horizontal coulter mixer is used for mixing components such as sodium lignosulfonate, humic acid, carbon black and barium sulfate, but the components are not subjected to ball milling and dispersing by a subsequent ball mill, the uniformity and the consistency of the obtained composition are still not good enough, the nucleating effect of barium sulfate cannot be well exerted, lead sulfate salinization is serious, the consistency of a power battery is poor, the cyclic charge-discharge consistency and the low-temperature capacitance of the whole lead-acid battery product are poor, and the service life of the final battery is not long.
The inventor researches to show that: the ball milling conditions such as the material of the inner wall of the ball mill, the material of the grinding balls, the size of the grinding balls, the grading of the large and small grinding balls, the filling rate of the grinding balls and the like play a very crucial role in whether a ball milling cathode bag with excellent dispersion performance can be obtained or not; under the ball milling condition, the ball milling negative electrode package components are not agglomerated and have uniform specific gravity, no wall adhesion and good material fluidity in the grinding process. The improper selection of the ball milling conditions easily causes the components in the ball milling negative electrode bag to be easily agglomerated and uneven in specific gravity, the material flow is easily adhered to the wall in the ball milling process, and the flowability of the material is also poor, so that the problem that a large amount of cleaning work needs to be performed from the material ball milling stage to the packaging stage, time and labor are consumed, the efficiency is low, continuous production cannot be performed, and the operation difficulty in industrial production is increased.
The invention also provides a negative electrode plate of the power battery, which is obtained by coating the negative electrode material of the power battery.
Detailed Description
The present invention is further explained below with reference to specific examples, but the scope of protection of the present invention is not limited to the specific examples.
Example 1 preparation of negative electrode material for power battery
The raw material ratio is as follows: taking the weight of the lead powder as a measurement standard, the weight and the dosage of each component are respectively as follows: 10% of dilute sulfuric acid (1.40g/mL), 12% of water, 0.3% of sodium lignosulfonate, 0.3% of humic acid, 0.3% of carbon black and 0.9% of barium sulfate;
the preparation method comprises the following steps:
(1) mixing sodium lignosulfonate, humic acid, carbon black and barium sulfate in a horizontal coulter mixer for 30min to obtain a negative electrode bag mixture;
(2) ball-milling the negative electrode pack mixture in a ball mill for 30min to obtain a ball-milled negative electrode pack; the inner wall of the ball mill is made of 304 stainless steel; the volume filling rate of the grinding medium in the ball mill is 45 percent; the grinding medium in the ball mill is graded by metal balls and metal oxide ceramic balls with three sizes; 304 stainless steel balls with the diameter of 10mm are respectively arranged; zirconium dioxide ceramic balls with the diameter of 25 mm; alumina ceramic balls with the diameter of 75 mm; the weight ratio of the stainless steel balls to the zirconium dioxide ceramic balls to the aluminum oxide ceramic balls is 4: 2: 1;
(3) and mixing the ball-milled negative electrode package with lead powder, dilute sulfuric acid and water, and adding the mixture into a paste mixer to neutralize paste to obtain the negative electrode material of the power battery.
Example 2 preparation of negative electrode material for power battery
The raw material ratio is as follows: taking the weight of the lead powder as a measurement standard, the weight and the dosage of each component are respectively as follows: 12% of dilute sulfuric acid (1.40g/mL), 10% of water, 0.5% of sodium lignosulfonate, 0.5% of humic acid, 0.5% of carbon black and 1.5% of barium sulfate;
the preparation method comprises the following steps:
(1) mixing sodium lignosulfonate, humic acid, carbon black and barium sulfate in a horizontal coulter mixer for 60min to obtain a negative electrode bag mixture;
(2) ball-milling the negative electrode bag mixture in a ball mill for 60min to obtain a ball-milled negative electrode bag; the inner wall of the ball mill is made of 304 stainless steel; the volume filling rate of the grinding medium in the ball mill is 30 percent; the grinding medium in the ball mill is graded by metal balls and metal oxide ceramic balls with three sizes; 304 stainless steel balls with the diameter of 2mm are respectively arranged; zirconium dioxide ceramic balls with the diameter of 15 mm; alumina ceramic balls with the diameter of 50 mm; the weight ratio of the stainless steel balls to the zirconium dioxide ceramic balls to the aluminum oxide ceramic balls is 10: 5: 3;
(3) and mixing the ball-milled negative electrode package with lead powder, dilute sulfuric acid and water, and adding the mixture into a paste mixer to neutralize paste to obtain the negative electrode material of the power battery.
Example 3 preparation of negative electrode material for power battery
The raw material ratio is as follows: taking the weight of the lead powder as a measurement standard, the weight and the dosage of each component are respectively as follows: 8% of dilute sulfuric acid (1.40g/mL), 15% of water, 0.1% of sodium lignosulfonate, 0.1% of humic acid, 0.1% of carbon black and 0.5% of barium sulfate;
the preparation method comprises the following steps:
(1) mixing sodium lignosulfonate, humic acid, carbon black and barium sulfate in a horizontal coulter mixer for 30min to obtain a negative electrode bag mixture;
(2) ball-milling the negative electrode bag mixture in a ball mill for 60min to obtain a ball-milled negative electrode bag; the inner wall of the ball mill is made of 304 stainless steel; the volume filling rate of the grinding medium in the ball mill is 60 percent; the grinding medium in the ball mill is graded by metal balls and metal oxide ceramic balls with three sizes; 304 stainless steel balls with the diameter of 5mm are respectively arranged; zirconium dioxide ceramic balls with the diameter of 50 mm; alumina ceramic balls with the diameter of 100 mm; the weight ratio of the stainless steel balls to the zirconium dioxide ceramic balls to the aluminum oxide ceramic balls is 20: 10: 1;
(3) and mixing the ball-milled negative electrode package with lead powder, dilute sulfuric acid and water, and adding the mixture into a paste mixer to neutralize paste to obtain the negative electrode material of the power battery.
Comparative example 1 preparation of negative electrode material for power battery
The raw material ratio is as follows: taking the weight of the lead powder as a measurement standard, the weight and the dosage of each component are respectively as follows: 10% of dilute sulfuric acid (1.40g/mL), 12% of water, 0.3% of sodium lignosulfonate, 0.3% of humic acid, 0.3% of carbon black and 0.9% of barium sulfate;
the preparation method comprises the following steps:
(1) mixing sodium lignosulfonate, humic acid, carbon black and barium sulfate in a horizontal coulter mixer for 30min to obtain a negative electrode bag mixture;
(2) mixing the negative electrode bag mixture in a high-speed mixer for 60min to obtain a negative electrode bag;
(3) and mixing the ball-milled negative electrode package with lead powder, dilute sulfuric acid and water, and adding the mixture into a paste mixer to neutralize paste to obtain the negative electrode material of the power battery.
Comparative example 2 preparation of negative electrode material for power battery
The raw material ratio is as follows: taking the weight of the lead powder as a measurement standard, the weight and the dosage of each component are respectively as follows: 10% of dilute sulfuric acid (1.40g/mL), 12% of water, 0.3% of sodium lignosulfonate, 0.3% of humic acid, 0.3% of carbon black and 0.9% of barium sulfate;
the preparation method comprises the following steps:
(1) mixing sodium lignosulfonate, humic acid, carbon black and barium sulfate in a horizontal coulter mixer for 30min to obtain a negative electrode bag mixture;
(2) ball-milling the negative electrode pack mixture in a ball mill for 30min to obtain a ball-milled negative electrode pack; the inner wall of the ball mill is made of 304 stainless steel; the volume filling rate of the grinding medium in the ball mill is 45 percent; the grinding medium in the ball mill is graded by metal balls and metal oxide ceramic balls with two sizes; 304 stainless steel balls with the diameter of 10mm are respectively arranged; a 304 stainless steel ball with the diameter of 25 mm; the weight ratio of the 10mm 304 stainless steel ball to the 25mm 304 stainless steel ball is 2: 1;
(3) and mixing the ball-milled negative electrode package with lead powder, dilute sulfuric acid and water, and adding the mixture into a paste mixer to neutralize paste to obtain the negative electrode material of the power battery.
Examples of the experiments
Coating the power battery negative electrode materials prepared in the examples 1-3 and the comparative examples 1 and 2 respectively to prepare power battery negative electrode plates; the 12V20Ah electric bicycle power cells were then assembled and tested for-15 ℃ low temperature capacity (evaluated in terms of discharge time/min) and-15 ℃ low temperature capacity (evaluated in terms of discharge time/min) after 50 cycles according to standard GB22199-2008, with the test results shown in table 1.
TABLE 1 test results of low temperature capacity of power battery
| Negative electrode material of power battery | Low temperature capacity of-15 deg.C | Low temperature capacity of-15 ℃ after 50 times of circulation |
| Example 1 negative electrode Material | 124min | 89min |
| Example 2 negative electrode Material | 119min | 82min |
| Example 3 negative electrode Material | 112min | 78min |
| Comparative example 1 negative electrode Material | 86min | 50min |
| Comparative example 2 negative electrode Material | 95min | 54min |
According to the low-temperature capacity test results of the power battery negative electrode materials prepared in the embodiments 1-3, the-15 ℃ low-temperature capacity and the-15 ℃ low-temperature capacity after 50 times of circulation have excellent performances. The preparation method is characterized in that in the preparation process of the battery cathode material, the components such as sodium lignosulphonate, humic acid, carbon black and barium sulfate are firstly taken out and dispersed separately to form a ball-milling cathode bag; and then, the negative electrode package is mixed with lead powder, dilute sulfuric acid and water in the process of mixing the negative electrode of the lead-acid battery with paste, so that the components in the raw material lead powder and the ball-milling negative electrode package can be fully dispersed, and the low-temperature capacity performance of the power battery can be greatly improved.
From the low-temperature capacity test result of the power battery negative electrode material prepared in the comparative example 1, it can be seen that the-15 ℃ low-temperature capacity and the-15 ℃ low-temperature capacity performance after 50 times of circulation are far lower than those of the example 1, which shows that in the preparation process of the battery negative electrode material, the power battery negative electrode material with excellent low-temperature capacity performance cannot be obtained by mixing the components such as sodium lignosulfonate, humic acid, carbon black and barium sulfate according to the conventional method.
The low-temperature capacity test result of the power battery cathode material prepared in the comparative example 2 shows that the-15 ℃ low-temperature capacity and the-15 ℃ low-temperature capacity after 50 times of circulation are much lower than those of the example 1, which shows that the ball milling step is very critical in the preparation process of the battery cathode material, and the power battery cathode material with excellent low-temperature capacity can be obtained only under the ball milling condition of the invention.
Claims (10)
1. The negative electrode material of the power battery is characterized by comprising lead powder, dilute sulfuric acid, water, sodium lignosulphonate, humic acid, carbon black and barium sulfate; wherein, taking the weight of the lead powder as a measurement standard, the weight and the dosage of each component are respectively as follows: 8-15% of dilute sulfuric acid, 10-20% of water, 0.1-1% of sodium lignosulfonate, 0.1-1% of humic acid, 0.1-1% of carbon black and 0.5-1.5% of barium sulfate.
2. The negative electrode material for the power battery as claimed in claim 1, wherein the weight of the lead powder is taken as a measurement standard, and the weight of each component is as follows: 8-12% of dilute sulfuric acid, 10-15% of water, 0.1-0.5% of sodium lignosulfonate, 0.1-0.5% of humic acid, 0.1-0.5% of carbon black and 0.5-1.5% of barium sulfate.
3. The negative electrode material for the power battery as claimed in claim 1, wherein the dilute sulfuric acid is dilute sulfuric acid with a concentration of 1.0-2.0 g/mL.
4. The preparation method of the power battery negative electrode material of any one of claims 1 to 4, characterized by comprising the following steps:
(1) mixing sodium lignosulphonate, humic acid, carbon black and barium sulfate to obtain a negative electrode bag mixture;
(2) performing ball milling on the negative electrode bag mixture for 5-60 min to obtain a ball-milled negative electrode bag;
(3) and mixing the ball-milled negative electrode package with lead powder, dilute sulfuric acid and water, and adding the mixture into a paste mixer to neutralize paste to obtain the negative electrode material of the power battery.
5. The preparation method of the negative electrode material for the power battery, according to claim 4, characterized in that the mixing in the step (1) is carried out in a mixer; and (3) performing ball milling in a ball mill in the step (2).
6. The preparation method of the power battery negative electrode material as claimed in claim 5, wherein the grinding medium in the ball mill has a density of 2.7-9 g/cm3The metal balls and/or metal oxide ceramic balls of (a); the volume filling rate of the grinding medium in the ball mill is 20-60%.
7. The preparation method of the power battery negative electrode material as claimed in claim 6, wherein the metal ball is selected from 304 stainless steel ball; the metal oxide ceramic ball is selected from a zirconium dioxide ceramic ball or an aluminum oxide ceramic ball.
8. The preparation method of the power battery negative electrode material according to claim 7, characterized in that metal balls and/or metal oxide ceramic balls with three sizes are selected as grinding media in the ball mill for grading; respectively are metal balls or metal oxide ceramic balls with the diameter of 2-15 mm; metal balls or metal oxide ceramic balls with the diameter of 15-50 mm; metal balls or metal oxide ceramic balls with a diameter of 50-100 mm.
9. The preparation method of the power battery negative electrode material is characterized in that the weight ratio of the metal balls or metal oxide ceramic balls with the diameter of 2-15 mm to the metal balls or metal oxide ceramic balls with the diameter of 15-50 mm to the metal balls or metal oxide ceramic balls with the diameter of 50-100 mm is 1-50: 1-50: 1-50;
preferably, the weight ratio of the metal balls or metal oxide ceramic balls with the diameter of 2-15 mm to the metal balls or metal oxide ceramic balls with the diameter of 15-50 mm to the metal balls or metal oxide ceramic balls with the diameter of 50-100 mm is 1-5: 1-5: 1-5;
most preferably, the grinding media in the ball mill are graded by selecting metal balls and/or metal oxide ceramic balls with three sizes; 304 stainless steel balls with the diameter of 2-15 mm are respectively arranged; zirconium dioxide ceramic balls with the diameter of 15-50 mm; alumina ceramic balls with the diameter of 50-100 mm; the weight ratio of the 304 stainless steel balls to the zirconium dioxide ceramic balls to the aluminum oxide ceramic balls is 3-5: 1-2: 1.
10. the negative pole plate of the power battery is characterized in that the negative pole plate of the power battery is obtained by coating the negative pole material of the power battery in claim 1 or 2.
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| CN102931398A (en) * | 2012-10-18 | 2013-02-13 | 双登集团股份有限公司 | Anode lead paste for pure lead battery and preparation method of anode lead paste |
| CN103456930A (en) * | 2013-09-26 | 2013-12-18 | 湖北骆驼蓄电池研究院有限公司 | Negative electrode diachylon used for high-performance AGM battery and preparing method thereof |
| CN108832090A (en) * | 2018-06-11 | 2018-11-16 | 陕西科技大学 | Lithium ion battery SiO2/ AG composite negative pole material and preparation method thereof |
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2020
- 2020-02-19 CN CN202010102801.4A patent/CN111326713A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101161347A (en) * | 2006-10-13 | 2008-04-16 | 南京理工大学 | Bidirectional tosh grinding ultra-fine crashing objects and its method |
| CN101847718A (en) * | 2010-05-31 | 2010-09-29 | 张天任 | Negative pole lead plaster for enhancing charging receptivity of lead-acid battery and preparation method thereof |
| CN102931398A (en) * | 2012-10-18 | 2013-02-13 | 双登集团股份有限公司 | Anode lead paste for pure lead battery and preparation method of anode lead paste |
| CN103456930A (en) * | 2013-09-26 | 2013-12-18 | 湖北骆驼蓄电池研究院有限公司 | Negative electrode diachylon used for high-performance AGM battery and preparing method thereof |
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Application publication date: 20200623 |