CN102386379A - Manufacturing method of lithium iron phosphate-cobalt acid lithium composite anode plate of lithium ion battery - Google Patents
Manufacturing method of lithium iron phosphate-cobalt acid lithium composite anode plate of lithium ion battery Download PDFInfo
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Abstract
The invention discloses a manufacturing method of a lithium iron phosphate-cobalt acid lithium composite anode plate of a lithium ion battery, which comprises the following steps: A, ball-milling and uniformly mixing a nanometer cobalt acid lithium anode active material with a nanometer Super-C conductive agent in proportion to obtain a cobalt acid lithium active material mixture; uniformly mixing the mixture with polyvinylidene fluoride; mixing the mixture with sodium carboxymethylcellulose to obtain anode active material slurry; B, preparing the anode active material slurry: ball-milling and uniformly mixing nanometer lithium iron phosphate with the nanometer Super-C conductive agent in proportion to obtain a lithium iron phosphate active material mixture; mixing the mixture with the sodium carboxymethylcellulose in proportion; adding distilled water into the mixture, ball-milling and mixing uniformly to obtain anode active material slurry B; and C, coating the slurry A on a single surface of an anode current collector, and coating the slurry B on double surfaces of an initial pole piece according to coating process, thus obtaining an anode pole piece. A nickel-metal hydride battery prepared by the invention has high volume, high multiplying power, a good discharging effect, and long circulating service life.
Description
Technical field
The present invention relates to battery and make the field; The manufacturing approach that more specifically relates to a kind of lithium-ion-power cell LiFePO4-cobalt acid lithium anode composite pole piece; Can be used for making various types of once, secondary lithium battery, especially for making lithium-ion-power cell.
Background technology
At present; The manufacturing of the based lithium-ion battery positive plate that lithium ion battery industry is produced; General all is by active material simple LiFePO4 or cobalt acid lithium or so-called ternary material isoreactivity material, conductive agent superfine graphite powder (Super-C), binding agent Kynoar (PVDF), molten stick (swelling or the deliquescent reagent of increase binding agent) N-methyl pyrrolidone (NMP), blowing agent or thickener sodium carboxymethylcellulose (CMC) and other additive mixing manufacture form slurry; Slurry is through coating process; Individual layer is coated on the aluminium foil plus plate current-collecting body, and operations such as spot welding lug are made.And not only exist by the lithium ion battery of the anodal manufacturing that has the manufacturing of anode slice of lithium ion battery technology now: shortcomings such as specific capacity is low, heavy-current discharge weak effect, cycle life weak point.And the lithium ion battery operating voltage of lithium cobaltate cathode active material manufacturing is higher merely (is 3.6～3.7V); But there is great potential safety hazard in it; Cobalt acid lithium possibly decompose under the higher stable condition and discharges oxygen, oxygen and organic electrolyte generation redox and blast; Though the lithium ion battery of simple iron phosphate lithium positive pole active material manufacturing does not exist and the similar potential safety hazard of cobalt acid lithium; But the lithium ion battery open circuit voltage and the operating voltage of the manufacturing of iron phosphate lithium positive pole active material are all lower; Its open circuit voltage is about 3.05～3.30V, and operating voltage is generally between 3.00～3.20V.
Summary of the invention
In order to solve the problems referred to above that prior art exists; The objective of the invention is to be to provide the manufacturing approach of a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece; The application of this lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece; Do not changing existing battery manufacturing process step and utilizing fully under the prerequisite of existing equipment; Adopt cobalt acid lithium active material and lithium-iron phosphate active material duplex coating structure, and suitably increase the ratio of acetylene black or super fine activated carbon conductive agent, and a kind of lithium ion battery LiFePO4 of making-cobalt acid lithium anode composite pole piece; Can improve effectively lithium ion battery discharge capacity, improve the heavy-current discharge effect of lithium ion battery, and prolong lithium ion battery useful life effectively.In addition,, can effectively utilize the advantage of two kinds of positive electrode active materials, shortcoming and defect that again can two kinds of materials of customer service owing to used the sour lithium duplex coating of two kinds of active compound lithium iron phosphates and cobalt.The advantage of cobalt acid lithium be operating voltage high (cobalt acid lithium 3.6～3.7V), deficiency is a poor safety performance, the advantage of LiFePO4 is that security performance is good.
The present invention is achieved through following technical proposals: the manufacturing approach of described a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece comprises that mainly double-deck positive active material slurry, plus plate current-collecting body aluminium foil and three parts such as nickel strap or nickel plated steel strip lug 3 constitute.
Further, the present invention includes following content:
The manufacturing approach of described a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece comprises that mainly double-deck positive active material slurry, plus plate current-collecting body aluminium foil and three parts such as nickel strap or nickel plated steel strip lug constitute;
The manufacturing approach of described a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece; It is characterized in that: the annexation of double-deck positive active material slurry, collector and lug three parts is: the ground floor active material slurry is coated on the collector through coating process; Second layer active material slurry is coated on the ground floor slurry through coating process, and lug is welded on the collector through spot-welding technology.
The manufacturing approach of a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece the steps include:
A, ground floor positive active material slurry are prepared by following steps:
The first step: is that 1: 5～10: 1 ratio ball mill mixing evenly obtains cobalt acid lithium active material admixture with class lithium cobaltate by nm positive active material and nanometer Super-C conductive agent in mass ratio;
In second step, mixture that the first step is obtained and Kynoar binding agent are that 1: 100～3: 100 mixed is even according to mass ratio;
The 3rd step; With second mixture that obtain of step and content be that the CMC (thickener) of 1% (mass ratio) is 1: 10～1: 5 a mixed according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) the solvent ball mill mixing of suitable Kynoar 50% (mass ratio);
In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 10～25% adding distil water ball mill mixing are even, obtains ground floor positive active material slurry A;
B, second layer positive active material slurry 1b are prepared by following steps:
The first step: is that 1: 5～10: 1 ratio ball mill mixing evenly obtains the lithium-iron phosphate active material mixture with nano-grade lithium iron phosphate and nanometer Super-C conductive agent in mass ratio;
In second step, mixture that the first step is obtained and Kynoar binding agent are that 1: 100～5: 100 ratio ball mill mixing is even according to mass ratio;
The 3rd step was 1: 10～1: 5 mixed with second mixture and the CMC (dispersant) that obtain of step according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) ball mill mixing of suitable Kynoar quality 50%;
In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 10～25% adding distil water ball mill mixing are even, obtains second layer positive active material slurry B;
C, slurry A that the A step is obtained according to coating process single face or double-coated on plus plate current-collecting body, dry under 65～95 ℃ of conditions, roller is pressed into the elementary pole piece that gross thickness is 0.015～0.25mm; Two-sided or single face is coated on the elementary pole piece slurry B that once more the B step is obtained with coating process, and drying is pressed into the anode pole piece that gross thickness is 0.015～0.35mm to roller under 65～95 ℃ of conditions; Reserve on the blank position in collector through cutting, 1～6 lug of spot welding.
Described a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece is characterized in that: described collector is that the aluminium foil of 0.01～0.10mm is processed by thickness.
Described a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece is characterized in that: described lug is that metal nickel strap or the nickel plated steel strip of 0.01～0.25mm processed by thickness.
Adopt the technical scheme of inventing type; Can obtain following obvious effects: with the battery that a kind of lithium ion battery LiFePO4 of technical scheme of the present invention-cobalt acid lithium anode composite pole piece is produced; Owing to adopted lithium-iron phosphate active material and the higher lithium cobaltate cathode active material duplex coating structure anode pole piece of discharge voltage that a certain proportion of specific discharge capacity is higher, thermal stability is high; Thereby improved the specific discharge capacity of lithium ion battery more effectively; Under 5C～30C discharged and recharged condition, the highest anodal specific discharge capacity was all above 120mAh/g, and had higher discharge voltage average above 3.5V (accompanying drawing 3); Owing to added a certain proportion of nanometer acetylene black or superfine graphite conductive agent; Thereby improved the heavy-current discharge effect of lithium ion battery; Because used simultaneously height ratio capacity, high conduction performance and adopted comparatively advanced manufacturing process to make LiFePO4-cobalt acid lithium anode composite sheet; The lithium ion battery of make making recycle the short significant prolongation that is able to of life-span, the anode composite pole piece of making is assembled into 18650 type lithium ion batteries, 5C～30C than the high power charging-discharging condition under; The cycle life of Experimental cell (the charge and discharge cycles number of times of discharge capacity during less than design capacity 70%, below under similarity condition, measure) is all above 650 times.
The present invention is applicable to the common lithium ion battery of all kinds, various models and the manufacturing of lithium-ion-power cell.
Description of drawings
Fig. 1 is the schematic perspective view of a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite single face monopole ear pole piece
Fig. 2 is the schematic perspective view of a kind of lithium ion battery LiFePO4-two-sided bipolar ear pole piece of cobalt acid lithium anode composite
Fig. 3 is the schematic perspective view of a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite single face three lug pole pieces
Fig. 4 is the schematic perspective view of a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite single face four lug pole pieces
Fig. 5 is the schematic perspective view of a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite single face five lug pole pieces
Fig. 6 is the schematic perspective view of a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite single face sextupole ear pole piece
Fig. 7 is the charging and discharging curve of a kind of lithium ion battery LiFePO4-1～5 circulation of cobalt acid lithium anode composite Experimental cell
Fig. 8 is the charging and discharging curve of a kind of lithium ion battery LiFePO4-605 circulations of cobalt acid lithium anode composite Experimental cell
Wherein: 1a～lithium cobaltate cathode coating layer of active substance, 1b～iron phosphate lithium positive pole coating layer of active substance, 2～collector, 3～lug, 4～reservation blank position.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is made further detailed description.
Embodiment 1:
The manufacturing approach of a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece the steps include:
A, ground floor positive active material slurry 1a are prepared by following steps: the first step: is that 1: 5 ratio ball mill mixing evenly obtains cobalt acid lithium active material admixture with class lithium cobaltate by nm positive active material and nanometer Super-C conductive agent in mass ratio; In second step, mixture that the first step is obtained and Kynoar binding agent are that 1: 100 mixed is even according to mass ratio; The 3rd step; With second mixture that obtain of step and content be that 1% CMC (thickener) is 1: 10～1: 5 a mixed according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) the solvent ball mill mixing of suitable Kynoar quality 50%; In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 10% adding distil water ball mill mixing is even, obtains ground floor positive active material slurry A;
B, second layer positive active material slurry 1b are prepared by following steps: the first step: is that 1: 5 ratio ball mill mixing evenly obtains the lithium-iron phosphate active material mixture with nano-grade lithium iron phosphate and nanometer Super-C conductive agent in mass ratio; In second step, mixture that the first step is obtained and Kynoar binding agent are that 1: 100 ratio ball mill mixing is even according to mass ratio; The 3rd step was 1: 10 mixed with second mixture and the CMC (dispersant) that obtain of step according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) ball mill mixing of suitable Kynoar quality 50%; In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 10% adding distil water ball mill mixing is even, obtains second layer positive active material slurry B;
C, slurry A that the A step is obtained according to coating process single face or double-coated on 0.01 aluminium foil plus plate current-collecting body, dry under 65 ℃ of conditions, roller is pressed into the elementary pole piece that gross thickness is 0.015mm; Two-sided or single face is coated on the elementary pole piece slurry B that once more the B step is obtained with coating process, and drying is pressed into the anode pole piece that gross thickness is 0.015mm to roller under 65 ℃ of conditions; Reserve on the blank position (Fig. 1) in collector through cutting, 1 lug of spot welding.
The electrode pad set of making is dressed up the experiment lithium ion battery, and the specific discharge capacity that under 5C discharges and recharges condition, obtains the 610th circulation of battery is 113mAh/g, and the cycle life of Experimental cell is 629 times.
Embodiment 2:
The manufacturing approach of a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece the steps include:
A, ground floor positive active material slurry 1a are prepared by following steps: the first step: is that 3: 5 ratio ball mill mixing evenly obtains cobalt acid lithium active material admixture with class lithium cobaltate by nm positive active material and nanometer Super-C conductive agent in mass ratio; In second step, mixture that the first step is obtained and Kynoar binding agent are that 1.5: 100 mixed is even according to mass ratio; The 3rd step, with second mixture that obtain of step and content be that 1% CMC (thickener) is 1: 66 a mixed according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) the solvent ball mill mixing of suitable Kynoar quality 50%; In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 15% adding distil water ball mill mixing is even, obtains ground floor positive active material slurry A;
B, described second layer positive active material slurry 1b are prepared by following steps: the first step: is that 2: 5 ratio ball mill mixing evenly obtains the lithium-iron phosphate active material mixture with nano-grade lithium iron phosphate and nanometer Super-C conductive agent in mass ratio; In second step, mixture that the first step is obtained and Kynoar binding agent are that 2: 100 ratio ball mill mixing is even according to mass ratio; The 3rd step was 2: 10 mixed with second mixture and the CMC (dispersant) that obtain of step according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) ball mill mixing of suitable Kynoar quality 50%; In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 15% adding distil water ball mill mixing is even, obtains second layer positive active material slurry B;
C, the slurry A that the A step is obtained are coated on according to the coating process single face on the aluminium foil plus plate current-collecting body of 0.015mm, and be dry under 75 ℃ of conditions, and roller is pressed into the elementary pole piece that gross thickness is 0.025mm; Two-sided or single face is coated on the elementary pole piece slurry B that once more the B step is obtained with coating process, and drying is pressed into the anode pole piece that gross thickness is 0.035mm to roller under 75 ℃ of conditions; Metallic nickel lug through cutting, 2 thickness of spot welding are 0.02mm is reserved on the blank position (Fig. 2) in collector.
The electrode pad set of making is dressed up Experimental cell, and under 20C discharges and recharges condition, obtaining anodal the 600th the charge and discharge cycles specific discharge capacity of battery nickel is 119mAh/g, and the cycle life of battery is 606 times.
Embodiment 3:
The manufacturing approach of a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece the steps include:
A, ground floor positive active material slurry 1a are prepared by following steps: the first step: is that 4: 5 ratio ball mill mixing evenly obtains cobalt acid lithium active material admixture with class lithium cobaltate by nm positive active material and nanometer Super-C conductive agent in mass ratio; In second step, mixture that the first step is obtained and Kynoar binding agent are that 2.5: 100 mixed is even according to mass ratio; The 3rd step; With second mixture that obtain of step and content be that 1% CMC (thickener) is 1.5: 10 a mixed according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) the solvent ball mill mixing of suitable Kynoar quality 50%; In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 20% adding distil water ball mill mixing is even, obtains ground floor positive active material slurry A;
B, described second layer positive active material slurry 1b are prepared by following steps: the first step: is that 4: 5 ratio ball mill mixing evenly obtains the lithium-iron phosphate active material mixture with nano-grade lithium iron phosphate and nanometer Super-C conductive agent in mass ratio; In second step, mixture that the first step is obtained and Kynoar binding agent are that 2.5: 100 ratio ball mill mixing is even according to mass ratio; The 3rd step was 1.5: 10 mixed with second mixture and the CMC (dispersant) that obtain of step according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) ball mill mixing of suitable Kynoar quality 50%; In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 20% adding distil water ball mill mixing is even, obtains second layer positive active material slurry B;
On the aluminium foil plus plate current-collecting body of 0.065mm, dry under 85 ℃ of conditions, it is 0.10 elementary pole piece that roller is pressed into gross thickness according to coating process single face or double-coated for C, slurry A that the A step is obtained; Two-sided or single face is coated on the elementary pole piece slurry B that once more the B step is obtained with coating process, and drying is pressed into the anode pole piece that gross thickness is 0.15mm to roller under 80 ℃ of conditions; A metallic nickel lug that through cutting, spot welding 3 thickness is 0.10mm is reserved on the blank position in collector.
The electrode pad set of making is dressed up the lithium ion Experimental cell, and under 15C discharges and recharges condition, obtaining the 625th charge and discharge cycles specific discharge capacity of battery is 118mAh/g, and the cycle life of battery is 685 times.
Embodiment 4:
The manufacturing approach of a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece the steps include:
A, ground floor positive active material slurry 1a are prepared by following steps: the first step: is that 5: 1 ratio ball mill mixing evenly obtains cobalt acid lithium active material admixture with class lithium cobaltate by nm positive active material and nanometer Super-C conductive agent in mass ratio; In second step, mixture that the first step is obtained and Kynoar binding agent are that 2.5: 100 mixed is even according to mass ratio; The 3rd step, with second mixture that obtain of step and content be that 1% CMC (thickener) is 1: 8 a mixed according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) the solvent ball mill mixing of suitable Kynoar quality 50%; In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 15% adding distil water ball mill mixing is even, obtains ground floor positive active material slurry A;
B, described second layer positive active material slurry 1b are prepared by following steps: the first step: is that 5: 1 ratio ball mill mixing evenly obtains the lithium-iron phosphate active material mixture with nano-grade lithium iron phosphate and nanometer Super-C conductive agent in mass ratio; In second step, mixture that the first step is obtained and Kynoar binding agent are that 2.5: 1005 ratio ball mill mixing is even according to mass ratio; The 3rd step was 1: 8 mixed with second mixture and the CMC (dispersant) that obtain of step according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) ball mill mixing of suitable Kynoar quality 50%; In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 105% adding distil water ball mill mixing is even, obtains second layer positive active material slurry B;
C, slurry A that the A step is obtained according to coating process single face or double-coated on the aluminium foil plus plate current-collecting body of 0.08mm, dry under 75 ℃ of conditions, roller is pressed into the elementary pole piece that gross thickness is 0.15mm; Two-sided or single face is coated on the elementary pole piece slurry B that once more the B step is obtained with coating process, and drying is pressed into the anode pole piece that gross thickness is 0.20mm to roller under 75 ℃ of conditions; Through cutting, 4 thickness of spot welding is that 0.20mm metallic nickel lug is reserved on the blank position in collector.
The electrode pad set of making is dressed up the lithium ion Experimental cell, and under 20C discharges and recharges condition, obtaining the 610th charge and discharge cycles specific discharge capacity of battery is 120mAh/g, and the cycle life of battery is 639 times.
Embodiment 5:
The manufacturing approach of a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece the steps include:
A, ground floor positive active material slurry 1a are prepared by following steps: the first step: is that 8: 1 ratio ball mill mixing evenly obtains cobalt acid lithium active material admixture with class lithium cobaltate by nm positive active material and nanometer Super-C conductive agent in mass ratio; In second step, mixture that the first step is obtained and Kynoar binding agent are that 3: 100 mixed is even according to mass ratio; The 3rd step, with second mixture that obtain of step and content be that 1% CMC (thickener) is 1: 5 a mixed according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) the solvent ball mill mixing of suitable Kynoar quality 50%; In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 25% adding distil water ball mill mixing is even, obtains ground floor positive active material slurry A;
B, described second layer positive active material slurry 1b are prepared by following steps: the first step: is that 10: 1 ratio ball mill mixing evenly obtains the lithium-iron phosphate active material mixture with nano-grade lithium iron phosphate and nanometer Super-C conductive agent in mass ratio; In second step, mixture that the first step is obtained and Kynoar binding agent are that 5: 100 ratio ball mill mixing is even according to mass ratio; The 3rd step was 1: 5 mixed with second mixture and the CMC (dispersant) that obtain of step according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) ball mill mixing of suitable Kynoar quality 50%; In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 25% adding distil water ball mill mixing is even, obtains second layer positive active material slurry B;
C, with described slurry A according to coating process single face or double-coated on the aluminium foil plus plate current-collecting body of 0.10mm, dry under 85 ℃ of conditions, roller is pressed into the elementary pole piece that gross thickness is 0.25mm; Two-sided or single face is coated on the elementary pole piece slurry B that once more the B step is obtained with coating process, and drying is pressed into the anode pole piece that gross thickness is 0.35mm to roller under 85 ℃ of conditions; Metallic nickel lug through cutting, 5 thickness of spot welding are 0.25mm is reserved on the blank position in collector.
The electrode pad set of making is dressed up the lithium ion Experimental cell; Under 10C discharges and recharges condition, obtaining the 550th charge and discharge cycles specific discharge capacity of battery is 118mAh/g; 1～5 charge and discharge cycles specific discharge capacity is all above 120mAh/g (Fig. 7), and the cycle life of battery is 608 times.
Embodiment 6:
The manufacturing approach of a kind of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece the steps include:
A, ground floor positive active material slurry 1a are prepared by following steps: the first step: is that 10: 1 ratio ball mill mixing evenly obtains cobalt acid lithium active material admixture with class lithium cobaltate by nm positive active material and nanometer Super-C conductive agent in mass ratio; In second step, mixture that the first step is obtained and Kynoar binding agent are that 3: 100 mixed is even according to mass ratio; The 3rd step, with second mixture that obtain of step and content be that 1% CMC (thickener) is 1: 5 a mixed according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) the solvent ball mill mixing of suitable Kynoar quality 50%; In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 25% adding distil water ball mill mixing is even, obtains ground floor positive active material slurry A;
B, second layer positive active material slurry 1b are prepared by following steps: the first step: is that 10: 1 ratio ball mill mixing evenly obtains the lithium-iron phosphate active material mixture with nano-grade lithium iron phosphate and nanometer Super-C conductive agent in mass ratio; In second step, mixture that the first step is obtained and Kynoar binding agent are that 5: 100 ratio ball mill mixing is even according to mass ratio; The 3rd step was 1: 5 mixed with second mixture and the CMC (dispersant) that obtain of step according to mass ratio, and it is even to add N-methyl pyrrolidone (NMP) ball mill mixing of suitable Kynoar quality 50%; In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 25% adding distil water ball mill mixing is even, obtains second layer positive active material slurry B;
C, the slurry A that the A step is obtained are coated on according to the coating process single face on the aluminium foil plus plate current-collecting body of 0.10mm, and be dry under 95 ℃ of conditions, and roller is pressed into the elementary pole piece that gross thickness is 0.25mm; Two-sided or single face is coated on the elementary pole piece slurry B that once more the B step is obtained with coating process, and drying is pressed into the anode pole piece that gross thickness is 0.35mm to roller under 95 ℃ of conditions; Nickel-plated steel lug through cutting, 6 thickness 0.25mm of spot welding is reserved on the blank position (Fig. 6) in collector.
The electrode pad set of making is dressed up the lithium ion Experimental cell, and under 30C discharges and recharges condition, obtaining the 607th charge and discharge cycles specific discharge capacity of battery is 102mAh/g (Fig. 8), and the cycle life of battery is 633 times.
Yet the above is merely the preferred embodiments of the present invention, is not so limits to scope of the present invention, and equivalences that all utilizations description of the present invention is carried out change, all equally within the scope of the present invention.
Claims (3)
1. the manufacturing approach of lithium ion battery LiFePO4-cobalt acid lithium anode composite pole piece the steps include:
The preparation of A, ground floor positive active material slurry:
The first step: is that the ratio ball mill mixing of 1:5～10:1 evenly obtains cobalt acid lithium active material admixture with class lithium cobaltate by nm positive active material and nanometer Super-C conductive agent in mass ratio;
In second step, mixture that the first step is obtained and Kynoar binding agent are that the mixed of 1:100～3:100 is even according to mass ratio;
The 3rd step, with second mixture that obtain of step and content be that the CMC of 1% mass ratio is the mixed of 1:10～1:5 according to mass ratio, and it is even to add the N-crassitude ketone solvent ball mill mixing of suitable Kynoar 50% mass ratio;
In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 10～25% adding distil water ball mill mixing are even, obtains ground floor positive active material slurry A;
The preparation of B, second layer positive active material slurry:
The first step: is that the ratio ball mill mixing of 1:5～10:1 evenly obtains the lithium-iron phosphate active material mixture with nano-grade lithium iron phosphate and nanometer Super-C conductive agent in mass ratio;
In second step, mixture that the first step is obtained and Kynoar binding agent are that the ratio ball mill mixing of 1:100～5:100 is even according to mass ratio;
The 3rd step was the mixed of 1:10～1:5 with second mixture and the CMC that obtain of step according to mass ratio, and it is even to add the N-methyl pyrrolidone ball mill mixing of suitable Kynoar quality 50%;
In the 4th step, obtaining adding mass percent in the mixture to the 3rd step is that 10～25% adding distil water ball mill mixing are even, obtains second layer positive active material slurry B;
C, slurry A that the A step is obtained according to coating process single face or double-coated on plus plate current-collecting body, dry under 65～95 ℃ of conditions, roller is pressed into the elementary pole piece that gross thickness is 0.015～0.25mm; Two-sided or single face is coated on the elementary pole piece slurry B that once more the B step is obtained with coating process, and drying is pressed into the anode pole piece that gross thickness is 0.015～0.35mm to roller under 65～95 ℃ of conditions; Reserve on the blank position in collector (2) through cutting, 1～6 lug of spot welding (3).
2. the manufacturing approach of a kind of lithium ion battery LiFePO4 according to claim 1-cobalt acid lithium anode composite pole piece is characterized in that: described collector (2) is that the aluminium foil of 0.01～0.10mm is processed by thickness.
3. the manufacturing approach of a kind of lithium ion battery LiFePO4 according to claim 1-cobalt acid lithium anode composite pole piece is characterized in that, described lug (3) is that metal nickel strap or the nickel plated steel strip of 0.01～0.25mm processed by thickness.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103378351A (en) * | 2012-04-17 | 2013-10-30 | 协鑫动力新材料（盐城）有限公司 | Battery positive pole piece and preparation method |
| CN103378344A (en) * | 2012-04-17 | 2013-10-30 | 协鑫动力新材料（盐城）有限公司 | Battery pole piece and preparation method thereof |
| CN105470496A (en) * | 2015-08-14 | 2016-04-06 | 万向A一二三系统有限公司 | Positive and negative plates for lithium-ion battery and battery employing positive and negative plates |
| CN107394109A (en) * | 2017-07-20 | 2017-11-24 | 惠州亿纬锂能股份有限公司 | A kind of electrode coating method and the electrode made using the coating method |
| CN107742709A (en) * | 2017-10-17 | 2018-02-27 | 中国科学院青岛生物能源与过程研究所 | A kind of lithium iron phosphate battery anode active material and its preparation and application |
| CN108075130A (en) * | 2018-01-05 | 2018-05-25 | 泉州劲鑫电子有限公司 | A kind of great-capacity power battery and preparation method thereof |
| CN108987671A (en) * | 2018-08-13 | 2018-12-11 | 北京卫蓝新能源科技有限公司 | A kind of high safety anode composite pole piece, preparation method and its application |
| CN109119619A (en) * | 2018-09-06 | 2019-01-01 | 李壮 | A kind of preparation method of the lithium ion cell positive of high rate capability |
| CN109256523A (en) * | 2018-09-15 | 2019-01-22 | 珠海光宇电池有限公司 | A kind of preparation method for the lithium ion battery improving high-voltage anode material comprehensive performance |
| CN109817467A (en) * | 2019-01-29 | 2019-05-28 | 上海奥威科技开发有限公司 | A kind of composite positive pole and preparation method thereof and a kind of electrochmical power source and preparation method thereof |
| CN112825349A (en) * | 2019-11-20 | 2021-05-21 | 郑州宇通集团有限公司 | Composite positive electrode plate and lithium secondary battery |
| WO2022143889A1 (en) * | 2020-12-30 | 2022-07-07 | 珠海冠宇电池股份有限公司 | Electrode sheet and lithium-ion battery |
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| CN1881660A (en) * | 2005-06-17 | 2006-12-20 | 董家琼 | Positive plate or negative plate with combination property for secondary lithium ion battery |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1881660A (en) * | 2005-06-17 | 2006-12-20 | 董家琼 | Positive plate or negative plate with combination property for secondary lithium ion battery |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103378351A (en) * | 2012-04-17 | 2013-10-30 | 协鑫动力新材料（盐城）有限公司 | Battery positive pole piece and preparation method |
| CN103378344A (en) * | 2012-04-17 | 2013-10-30 | 协鑫动力新材料（盐城）有限公司 | Battery pole piece and preparation method thereof |
| CN103378344B (en) * | 2012-04-17 | 2016-01-20 | 协鑫动力新材料（盐城）有限公司 | Battery pole piece and preparation method |
| CN105470496A (en) * | 2015-08-14 | 2016-04-06 | 万向A一二三系统有限公司 | Positive and negative plates for lithium-ion battery and battery employing positive and negative plates |
| CN107394109A (en) * | 2017-07-20 | 2017-11-24 | 惠州亿纬锂能股份有限公司 | A kind of electrode coating method and the electrode made using the coating method |
| CN107742709A (en) * | 2017-10-17 | 2018-02-27 | 中国科学院青岛生物能源与过程研究所 | A kind of lithium iron phosphate battery anode active material and its preparation and application |
| CN108075130A (en) * | 2018-01-05 | 2018-05-25 | 泉州劲鑫电子有限公司 | A kind of great-capacity power battery and preparation method thereof |
| CN108987671A (en) * | 2018-08-13 | 2018-12-11 | 北京卫蓝新能源科技有限公司 | A kind of high safety anode composite pole piece, preparation method and its application |
| CN109119619A (en) * | 2018-09-06 | 2019-01-01 | 李壮 | A kind of preparation method of the lithium ion cell positive of high rate capability |
| CN109256523A (en) * | 2018-09-15 | 2019-01-22 | 珠海光宇电池有限公司 | A kind of preparation method for the lithium ion battery improving high-voltage anode material comprehensive performance |
| CN109817467A (en) * | 2019-01-29 | 2019-05-28 | 上海奥威科技开发有限公司 | A kind of composite positive pole and preparation method thereof and a kind of electrochmical power source and preparation method thereof |
| CN109817467B (en) * | 2019-01-29 | 2021-10-22 | 上海奥威科技开发有限公司 | Composite cathode material and preparation method thereof, and chemical power supply and preparation method thereof |
| CN112825349A (en) * | 2019-11-20 | 2021-05-21 | 郑州宇通集团有限公司 | Composite positive electrode plate and lithium secondary battery |
| CN112825349B (en) * | 2019-11-20 | 2022-05-17 | 郑州宇通集团有限公司 | Composite positive electrode plate and lithium secondary battery |
| WO2022143889A1 (en) * | 2020-12-30 | 2022-07-07 | 珠海冠宇电池股份有限公司 | Electrode sheet and lithium-ion battery |
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Application publication date: 20120321 |