CN1780032A - Production of composite anode with manganese lithium for lithium ion cell - Google Patents
Production of composite anode with manganese lithium for lithium ion cell Download PDFInfo
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- CN1780032A CN1780032A CNA2004100728496A CN200410072849A CN1780032A CN 1780032 A CN1780032 A CN 1780032A CN A2004100728496 A CNA2004100728496 A CN A2004100728496A CN 200410072849 A CN200410072849 A CN 200410072849A CN 1780032 A CN1780032 A CN 1780032A
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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
A composite positive electrode of Li ion battery is prepared through sieving the manganese lithium oxide and carbon powder A and B, mixing, stirring, vacuum baking, cooling to obtain a composite powder, slowly adding adhesive in organic solvent proportionally while stirring to obtain adhesive solution, adding said composite powder to said adhesive solution, vacuum stirring to obtain slurry, and coating it on current collecting plate.
Description
Technical field
The invention belongs to the lithium ion battery material technical field, particularly relate to a kind of preparation method of composite anode with manganese lithium for lithium ion cell.
Background technology
Present disclosed lithium ion cell positive manganese oxide lithium material because its price is low, is extensively developed, but because its capacity is low, cementability is poor, need add conductive agent and bonding agent in this material, to improve battery capacity and adhesive property.Existing technology is to add a kind of carbon dust of model as conductive agent in the manganese oxide lithium powder, this conductive agent addition is bigger, cause active matter manganese oxide lithium content minimizing in the electrode, reduced the capacity of battery, and the electrode that prior art is made ruptures easily in the course of processing, be difficult for to be shaped, and material comes off easily, influence the discharge performance of battery.
Summary of the invention
The present invention is for solving problems of the prior art, a kind of electrode easy-formation of preparing, easy fracture not are provided, and the material difficult drop-off can improve battery capacity and the preparation method who improves the composite anode with manganese lithium for lithium ion cell of cell discharge performance.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is:
A kind of preparation method of composite anode with manganese lithium for lithium ion cell is 40～45% manganese oxide lithium and a kind of model carbon dust 1 of 2～5% with weight ratio; 1～4% another kind of model carbon dust 2; 3～8% adhesive; 40～45% organic solvent mixes, and is characterized in adopting the following step:
1. the back of carbon dust 1, the carbon dust 2 usefulness vibrating sieving machines of the manganese oxide lithium of described ratio and described ratio being sieved is dropped into to mix to mix in the powder machine and is stirred, then mixed powder is put into heating, drying in the vacuum drying chamber, then vacuum drying chamber is evacuated, continue oven dry, be cooled to room temperature, become the composite positive pole powder;
2. under the environment of relative humidity≤3%, the adhesive of described ratio is slowly joined in the organic solvent of described ratio, to stir in the time of reinforced, the reinforced back of finishing is continued stirring and is made adhesive solvent;
3. the composite positive pole powder for preparing being inserted adhesive solvent stirs in mixer, and then be-0.08 in vacuum degree～-stir under the 0.1Mpa state, the paste mixture of making is coated on the collector plate, is composite anode with manganese lithium for lithium ion cell.
The present invention can also adopt following technical measures to realize:
The preparation method of composite anode with manganese lithium for lithium ion cell, the model that is characterized in described a kind of model carbon dust 1 are that the model of KS-15, another kind of model carbon dust 2 is SS.
The preparation method of composite anode with manganese lithium for lithium ion cell is characterized in that described adhesive is a Kynoar.
The preparation method of composite anode with manganese lithium for lithium ion cell is characterized in that described organic solvent is the N methyl pyrrolidone.
The preparation method of composite anode with manganese lithium for lithium ion cell is characterized in that carbon dust 1, carbon dust 2 with the manganese oxide lithium of described ratio and described ratio shakes to be sieved to 200 orders; Described mixing time is 15～20 minutes; The heating, drying temperature is 100 ℃～102 ℃ in the described vacuum drying chamber, and drying time is 7 hours; The evacuated vacuum degree of described vacuum drying chamber remains on-0.08～-0.1Mpa, continuing drying time under this vacuum degree is 1 hour.
The preparation method of composite anode with manganese lithium for lithium ion cell is characterized in that the speed that described adhesive joins in the described organic solvent is 0.5 Grams Per Second, and the time of continuing to stir after described reinforced the finishing is 30 minutes.
The preparation method of composite anode with manganese lithium for lithium ion cell is characterized in that it is 90 minutes that the described composite positive pole powder for preparing is inserted the adhesive solvent mixing time, be-0.08 in vacuum degree～-mixing time under the 0.1Mpa state is 30 minutes.
Advantage and good effect that the present invention has are: by add an amount of model in the manganese oxide lithium material is the carbon dust 1 of KS-15 and the carbon dust 2 that model is SS, and the mixing of sieving, stirring, oven dry, with baking oven be evacuated, process such as natural cooling, add again adhesive solvent be-0.08 in vacuum degree～-stir under the 0.1Mpa state, finally prepare material difficult drop-off on the electrode, improve the composite anode with manganese lithium for lithium ion cell of battery performance.
Description of drawings
Fig. 1 is the battery normal temperature 60A discharge curve of the embodiment of the invention 1;
Fig. 2 is the battery low temperature-20 ℃ of the embodiment of the invention 1, the 20A discharge curve;
Fig. 3 is battery high-temperature+60 ℃ of the embodiment of the invention 1, the 20A discharge curve;
Fig. 4 is the battery short circuit curve chart of the embodiment of the invention 1;
Fig. 5 is the battery overcharge curve chart of the embodiment of the invention 1.
Embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, enumerate following examples now, and conjunction with figs. is described in detail as follows:
Embodiment 1:
With weight ratio is that 45% manganese oxide lithium and model 4% carbon dust 1 that is KS-15, carbon dust 2 and 4% Kynoar, 45% the N methyl pyrrolidone that model is SS 1～2% fully are mixed and made into paste mixture, roll to collector plate, its technical process is as follows:
1. earlier the manganese oxide lithium is sieved the back in mixing in the mixed powder machine of described ratio input with described two kinds of carbon dusts with 200 order vibrating sieving machines, mixing time is 15～20 minutes.Then mixed powder is put into heating, drying in the vacuum drying chamber, bake out temperature is 100 ℃～102 ℃, and drying time is 7 hours, then baking oven is evacuated, vacuum degree remains on-0.08～-0.1Mpa, naturally cool to room temperature after 1 hour continuing oven dry under this vacuum degree.
2. under the environment of relative humidity≤3%, the speed of Kynoar according to 0.5 Grams Per Second is slowly joined in the N methyl pyrrolidone, stir in the time of reinforced, continue to stir after reinforced the finishing and made adhesive solvent in 30 minutes, the solution solid content is 5～10%.
3. powder and the adhesive solvent for preparing stirred in mixer 90 minutes, and then be-0.08 in vacuum degree～-stirred 30 minutes under the 0.1Mpa state, make paste mixture.
4. mixture is coated the two sides of 20 micron thickness aluminium foils, is made electrode after the oven dry down 135 ℃～140 ℃ of temperature conditions, electrode is 180～185 microns through rolling thickness again, cut out partial width be 285 millimeters and and collector bar between welding after as anode.
The electrode that the foregoing description 1 is made is made the performance characterization curve of battery and seen shown in Fig. 1-5 Fig. 1: battery is under 25 ℃ ± 2 ℃ environment of normal temperature, and battery discharges with 60A, drops to 3V at voltage by peak value 4.2V, and the capacity that battery is emitted is 60Ah; Fig. 2: battery under low temperature-20 ℃ ± 2 ℃ environment, shelve 16h after, with the 20A discharge, it is 56Ah that voltage is reduced to the capacity of being emitted in the 3.0V process by 4.2V; Fig. 3: battery under the environment of high temperature+60 ℃ ± 2 ℃, shelve 5h after, with the 20A discharge, it is 58Ah that voltage is reduced to the capacity of being emitted in the 3.0V process by 4.2V; Fig. 4: battery is under full power state, under battery positive and negative electrode short-circuit condition, be that conductive resistance is less than voltage, electric current and temperature variations in the 50 milliohm processes, voltage is reduced to 0V by 4.2V, average current is more than 400A, maximum current is 550A, and temperature is the highest to be no more than 100 ℃, and cell safety is reliable; Fig. 5: the battery that is in full power state is charged with 20A, till making battery failure, this figure curve representation in this process voltage and variation of temperature situation, as a result battery not on fire, do not explode, safe and reliable.
For further specifying advantage of the present invention, the battery that has provided the making of the present invention and prior art processes compares:
| Discharging condition | Performance index | The positive pole that existing technology is made | The positive pole that the present invention is affected |
| Normal temperature | Battery capacity | 50Ah | 60Ah |
| -20℃ | Battery capacity | 42.5Ah | 56Ah |
| +60℃ | Battery capacity | 46.5Ah | 58Ah |
| Short circuit | Average current | 350A | 400A |
| | 100 | 100℃ | |
| Overcharge | Crest voltage | 6V | 12V |
| Maximum temperature | 330℃ | 330℃ |
From the performance index table of comparisons as can be seen, the discharge capacity of electrode under various ambient temperatures that the present invention makes than prior art all improves a lot, and in the short circuit and the process of overcharging, under battery maximum temperature same case, battery bears short circuit and the ability of overcharging all has raising.
Claims (7)
1. the preparation method of a composite anode with manganese lithium for lithium ion cell is 40～45% manganese oxide lithium and a kind of model carbon dust 1 of 2～5% with weight ratio; 1～4% another kind of model carbon dust 2; 3～8% adhesive; 40～45% organic solvent mixes, and it is characterized in that adopting the following step:
1. the back of carbon dust 1, the carbon dust 2 usefulness vibrating sieving machines of the manganese oxide lithium of described ratio and described ratio being sieved is dropped into to mix to mix in the powder machine and is stirred, then mixed powder is put into heating, drying in the vacuum drying chamber, then vacuum drying chamber is evacuated, continue oven dry, be cooled to room temperature, become the composite positive pole powder;
2. under the environment of relative humidity≤3%, the adhesive of described ratio is slowly joined in the organic solvent of described ratio, to stir in the time of reinforced, the reinforced back of finishing is continued stirring and is made adhesive solvent;
3. the composite positive pole powder for preparing being inserted adhesive solvent stirs in mixer, and then be-0.08 in vacuum degree～-stir under the 0.1Mpa state, the paste mixture of making is coated on the collector plate, is composite anode with manganese lithium for lithium ion cell.
2. according to the preparation method of the described composite anode with manganese lithium for lithium ion cell of claim 1, it is characterized in that: the model of described a kind of model carbon dust 1 is that the model of KS-15, another kind of model carbon dust 2 is SS.
3. according to the preparation method of the described composite anode with manganese lithium for lithium ion cell of claim 1, it is characterized in that: described adhesive is a Kynoar.
4. according to the preparation method of the described composite anode with manganese lithium for lithium ion cell of claim 1, it is characterized in that: described organic solvent is the N methyl pyrrolidone.
5. according to the preparation method of claim 1 or 2 described composite anode with manganese lithium for lithium ion cell, it is characterized in that: carbon dust 1, the carbon dust 2 of the manganese oxide lithium of described ratio and described ratio shaken is sieved to 200 orders; Described mixing time is 15～20 minutes; The heating, drying temperature is 100 ℃～102 ℃ in the described vacuum drying chamber, and drying time is 7 hours; The evacuated vacuum degree of described vacuum drying chamber remains on-0.08～-0.1Mpa, continuing drying time under this vacuum degree is 1 hour.
6. according to the preparation method of the described composite anode with manganese lithium for lithium ion cell of claim 5, it is characterized in that: the speed that described adhesive joins in the described organic solvent is 0.5 Grams Per Second, and the time of continuing to stir after described reinforced the finishing is 30 minutes.
7. according to the preparation method of the described composite anode with manganese lithium for lithium ion cell of claim 6, it is characterized in that: it is 90 minutes that the described composite positive pole powder for preparing is inserted the adhesive solvent mixing time, be-0.08 in vacuum degree～-mixing time under the 0.1Mpa state is 30 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100728496A CN1780032A (en) | 2004-11-22 | 2004-11-22 | Production of composite anode with manganese lithium for lithium ion cell |
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| CNA2004100728496A CN1780032A (en) | 2004-11-22 | 2004-11-22 | Production of composite anode with manganese lithium for lithium ion cell |
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| CN1780032A true CN1780032A (en) | 2006-05-31 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332562A (en) * | 2011-07-30 | 2012-01-25 | 珠海锂源动力科技有限公司 | Method for preparing negative electrode slurry of lithium titanate battery |
| CN110311087A (en) * | 2018-03-20 | 2019-10-08 | 安徽瑞科玛电池有限公司 | A kind of anode material of lithium battery preparation process |
| US11105861B2 (en) * | 2017-11-17 | 2021-08-31 | Lg Chem, Ltd. | Device and method for estimating battery resistance |
-
2004
- 2004-11-22 CN CNA2004100728496A patent/CN1780032A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332562A (en) * | 2011-07-30 | 2012-01-25 | 珠海锂源动力科技有限公司 | Method for preparing negative electrode slurry of lithium titanate battery |
| US11105861B2 (en) * | 2017-11-17 | 2021-08-31 | Lg Chem, Ltd. | Device and method for estimating battery resistance |
| CN110311087A (en) * | 2018-03-20 | 2019-10-08 | 安徽瑞科玛电池有限公司 | A kind of anode material of lithium battery preparation process |
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