CN116864688A - Pulping method of mixed conductive agent - Google Patents
Pulping method of mixed conductive agent Download PDFInfo
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- CN116864688A CN116864688A CN202310823119.8A CN202310823119A CN116864688A CN 116864688 A CN116864688 A CN 116864688A CN 202310823119 A CN202310823119 A CN 202310823119A CN 116864688 A CN116864688 A CN 116864688A
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- mixed conductive
- conductive agent
- positive electrode
- negative electrode
- glue solution
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- 239000006258 conductive agent Substances 0.000 title claims abstract description 92
- 238000004537 pulping Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000003292 glue Substances 0.000 claims abstract description 74
- 239000002002 slurry Substances 0.000 claims abstract description 54
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 39
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims description 50
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 48
- 239000000853 adhesive Substances 0.000 claims description 33
- 230000001070 adhesive effect Effects 0.000 claims description 33
- 239000006230 acetylene black Substances 0.000 claims description 30
- 239000002904 solvent Substances 0.000 claims description 22
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 21
- 229910052744 lithium Inorganic materials 0.000 claims description 21
- 235000006408 oxalic acid Nutrition 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 16
- 238000002360 preparation method Methods 0.000 claims description 12
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 6
- 239000006183 anode active material Substances 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 6
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- 239000005060 rubber Substances 0.000 claims description 6
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000007774 positive electrode material Substances 0.000 claims description 5
- 239000002041 carbon nanotube Substances 0.000 claims description 4
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 4
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 4
- 229910021483 silicon-carbon alloy Inorganic materials 0.000 claims description 4
- 239000007773 negative electrode material Substances 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 229920000098 polyolefin Polymers 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 239000011149 active material Substances 0.000 abstract description 2
- 239000006229 carbon black Substances 0.000 abstract description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical group CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 46
- 238000003756 stirring Methods 0.000 description 36
- 238000012360 testing method Methods 0.000 description 26
- 210000004027 cell Anatomy 0.000 description 16
- 238000007600 charging Methods 0.000 description 14
- 230000014759 maintenance of location Effects 0.000 description 14
- 238000011056 performance test Methods 0.000 description 10
- 239000007788 liquid Substances 0.000 description 8
- 238000007599 discharging Methods 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000007784 solid electrolyte Substances 0.000 description 5
- 229910004764 HSV900 Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000010277 constant-current charging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 239000011244 liquid electrolyte Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 210000003092 coiled body Anatomy 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019241 carbon black Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010280 constant potential charging Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000012442 inert solvent Substances 0.000 description 1
- 239000010416 ion conductor Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a pulping method of a mixed conductive agent, and belongs to the technical field of electrodes comprising active materials. The method comprises the steps of preparing positive and negative electrode glue solution, preparing positive and negative electrode mixed conductive glue and preparing positive and negative electrode mixed conductive agent slurry. In the process, aiming at the processing requirements of positive and negative electrode glue solution, the mixed conductive agent prepared from Super-p conductive carbon black and LI435 acetylene carbon black in a specific proportion is adopted.
Description
Technical Field
The invention relates to the technical field of electrodes comprising active materials, in particular to a pulping method of a mixed conductive agent.
Background
The conventional lithium ion battery uses an organic liquid electrolyte, and although the liquid electrolyte can provide higher ionic conductivity and good interface contact, the liquid electrolyte cannot be safely used for a metal lithium system, and the problems of low migration number of lithium ions, easy leakage, easy volatilization, flammability, poor safety and the like prevent the further development of the lithium battery. In order to prevent the safety problems of leakage, inflammability, explosiveness and the like of the conventional lithium ion battery, the electrolyte system of the lithium secondary battery is developing to solid state. The solid electrolyte has good lithium ion conductivity as a fast ion conductor, but has poor electron conductivity, and when the solid electrolyte is applied to the production of lithium ion batteries, a conductive material is generally required to be added to improve the electron conductivity. In addition, the solid electrolyte powder is easy to agglomerate, so that the solid electrolyte powder and the conductive material are dispersed in a solvent to prepare slurry, but the solid electrolyte has larger specific gravity, the phenomenon of particle sedimentation occurs in the slurry, and the conductive material has smaller specific gravity, so that the floating condition occurs, the slurry is uneven, and the transportation, storage and use of the slurry are seriously affected. Therefore, how to improve the quality of slurry in the production of lithium batteries and the performance of lithium batteries is a major problem to be solved at present.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, in a first aspect of the present invention, there is provided a method for pulping a mixed conductive agent for improving battery performance with good stability and uniformity, comprising the steps of:
(1) Uniformly mixing the adhesive and the solvent to obtain an anode glue solution; uniformly mixing the adhesive, oxalic acid and a solvent to obtain a negative electrode glue solution;
(2) Adding the mixed conductive agent to the positive electrode glue solution, and uniformly mixing to obtain positive electrode mixed conductive glue; adding the mixed conductive agent to the negative electrode glue solution, and uniformly mixing to obtain negative electrode mixed conductive glue; the mixed conductive agent is a mixture formed by Super-p conductive carbon black and LI435 acetylene black;
(3) Adding an anode active material into the anode mixed conductive adhesive, and adding a solvent to uniformly mix to obtain anode mixed conductive agent slurry; and adding the anode active material into the anode mixed conductive adhesive, adding a solvent, and uniformly mixing to obtain anode mixed conductive agent slurry, thereby completing anode pulping and anode pulping.
In long-term production practice, the inventor finds that the LI435 acetylene black has the characteristics of high purity, small particle size and low addition amount. For Super-p conductive carbon black, the cost is low, the conductivity is good, the particle size is small, the specific surface area is large, and the dosage is large.
Preferably, in the step (1), the adhesive is at least one selected from the group consisting of polyvinyl alcohol, polytetrafluoroethylene, carboxymethyl cellulose, polyolefin, polyvinylidene fluoride, styrene-butadiene rubber, fluorinated rubber and polyurethane, respectively, in the positive electrode glue solution and the negative electrode glue solution.
Preferably, in the step (1), the viscosity of the positive electrode glue solution ranges from 1500 to 2500mpa.s; the viscosity range of the negative electrode glue solution is 100-500 mpa.s.
Further preferably, in the preparation process of the positive electrode glue solution, the mass ratio of the Super-p conductive carbon black to the LI435 acetylene black is (3.00:1.27) - (3.12:1.32).
Further preferably, in the preparation process of the negative electrode glue solution, the mass ratio of the Super-p conductive carbon black to the LI435 acetylene black is (2.00:1.36) to (2.11:1.43).
The Super-p conductive carbon black and the LI435 acetylene black are respectively mixed according to specific proportions in different glue making processes, so that the cost can be reduced to a certain extent, the liquid absorption effect, the conductivity, the charge and discharge performance and the cycle life of the battery are improved, the effects of supplementing the advantages and the disadvantages of single type or random proportion mixing are overcome. The reason for achieving the purpose is that under the proportion, the cost and the particle size of the two conductive carbon blacks are lower, so that the cost can be reduced; the LI435 acetylene black has high purity, can reduce the short circuit phenomenon of the battery after mixing and pulping, has a structure with a large number of electron paths formed by small particle size adaptation of the LI435 acetylene black and a high specific surface area, and more electrolyte can permeate into the structure, namely, the electrolyte can permeate into the structure to be equal to lithium electrons and has a conduction path, so that the electron conductivity of the electrode material is improved, and the conductivity and the charge-discharge performance of the battery are improved. In addition, the Super-p conductive carbon black and the LI435 acetylene black can improve the liquid absorption effect of the battery under the corresponding proportion, so that the electrolyte uniformly infiltrates the diaphragm, and the cycle life of the battery is prolonged. Aiming at different application requirements of the anode and the cathode. According to the invention, the two components are mixed together according to different proportions in the pulping process, and the mixture is fully and uniformly mixed and then is subjected to equal proportion feeding, so that the LI435 acetylene black has high conductivity and good dispersibility, and when the LI435 acetylene black is used in a pulping process, the stability and uniformity of the slurry can be improved, and the conductivity and the charge-discharge performance of a lithium battery are further improved. LI435 acetylene black is hydrophobic conductive black, and can not generate condensation phenomenon due to moisture, and can not generate degassing phenomenon during heat treatment, so that the quality of slurry can be improved; in addition, LI435 acetylene black has better liquid absorption, and plays a role in absorbing and preserving liquid together with Super-p conductive carbon black, so that the cycle life of the battery can be prolonged.
Preferably, in the step (2), the viscosity of the positive electrode mixed conductive adhesive ranges from 2000 to 3000mpa.s; the viscosity range of the negative electrode mixed conductive adhesive is 1000-2000 mpa.s.
Preferably, in the step (3), the positive electrode active material is at least one of lithium cobaltate, lithium manganate, lithium iron phosphate and ternary material.
Further preferably, the positive electrode active material is KP-05T3.
Preferably, in the step (3), the negative electrode active material is at least one of graphite, silicon carbon alloy, tin-based composite oxide, lithium titanate, and carbon nanotubes.
Further preferably, the negative electrode active material is lithium titanate.
Preferably, in the step (3), the viscosity of the positive electrode mixed conductive agent slurry ranges from 9000 to 18000mpa.s; the viscosity range of the anode mixed conductive agent slurry is 10000-20000 mpa.s.
Preferably, the raw materials account for 33-35% of the mass percentage of the positive electrode mixed conductive agent slurry, and the additive amount of the adhesive is 2.0-2.2% of the solvent in the preparation of the positive electrode glue solution; in the preparation of the positive electrode mixed conductive agent slurry, the addition amount of the positive electrode active material is 50-55%, and the additional addition amount of the solvent is 7.5-8.5%; the balance being mixed conductive agent.
Preferably, in the preparation of the negative electrode glue solution, the raw materials account for 31-33% of the mass percentage of the negative electrode mixed conductive agent slurry, the addition amount of the solvent is 0.12-0.14% of the oxalic acid, and the addition amount of the adhesive is 1.5-1.7%; in the preparation of the anode mixed conductive agent slurry, the addition amount of an anode active material is 39-44%, and the addition amount of the solvent is 22-24%; the balance being mixed conductive agent.
Preferably, the solvent is at least one of an organic acid solvent, an organic alkaline solvent, an organic amphoteric solvent and an organic inert solvent.
Further preferably, the solvent is N-methylpyrrolidone.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention provides a pulping method of a mixed conductive agent, which comprises the steps of mixing the two materials according to different proportions in the pulping process, fully and uniformly mixing, and then charging in equal proportion, wherein LI435 acetylene black has high conductivity and good dispersibility, and can improve the stability and uniformity of the slurry when being used in the pulping process, thereby improving the conductivity and charge-discharge performance of a lithium battery. LI435 acetylene black is hydrophobic conductive black, and can not generate condensation phenomenon due to moisture, and can not generate degassing phenomenon during heat treatment, so that the quality of slurry can be improved; in addition, LI435 acetylene black has better liquid absorption, and plays a role in absorbing and preserving liquid together with Super-p conductive carbon black, so that the cycle life of the battery can be prolonged. Therefore, the pulping method not only can improve the liquid absorption effect of the battery, but also can improve the charge and discharge performance, the multiplying power performance and the cycle life of the battery.
Drawings
FIG. 1 is a graph of a 2C high temperature cycle performance test for NTO46180-27Ah cells numbered 10012;
FIG. 2 is a graph of a 2C high temperature cycle performance test for an NTO46180-27Ah cell numbered 10008;
FIG. 3 is a graph of a 2C high temperature cycle performance test for NTO46180-27Ah cell number 10030;
FIG. 4 is a graph of 0.3C low temperature charging performance test for NTO46180-27Ah battery number 10007;
FIG. 5 is a graph of 0.3C low temperature charging performance test for NTO46180-27Ah battery number 10002;
FIG. 6 is a graph of 0.3C low temperature charge performance test for NTO46180-27Ah cell number 10015;
FIG. 7 is a graph of 0.3C low temperature discharge performance test for NTO46180-27Ah cell number 10002;
FIG. 8 is a graph of 0.3C low temperature discharge performance test of NTO46180-27Ah cell number 10007;
FIG. 9 is a graph of 0.3C low temperature discharge performance test for NTO46180-27Ah cell number 10015;
FIG. 10 is a 1-8C rate charge test chart for NTO46180-27Ah batteries numbered 10001;
FIG. 11 is a 1-8C rate charge test chart for NTO46180-27Ah battery numbered 10022;
FIG. 12 is a 1-8C rate charge test chart for NTO46180-27Ah batteries numbered 10025;
FIG. 13 is a graph of 1-8C rate discharge tests for NTO46180-27Ah cells numbered 10001;
FIG. 14 is a graph of 1-8C rate discharge tests for NTO46180-27Ah cells numbered 10022;
fig. 15 is a 1-8C rate discharge test chart for the ntu 46180-27Ah cell numbered 10025.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods, in which specific conditions are not noted in the following examples, were selected according to conventional methods and conditions, or according to the commercial specifications.
Example 1
The pulping method of the mixed conductive agent comprises the following steps:
(1) Mixing polyvinylidene fluoride HSV900 and N-methyl pyrrolidone, and stirring to prepare positive electrode glue solution with the viscosity of 1500-2500 mpa.s; mixing polyvinylidene fluoride HSV900, oxalic acid and N-methyl pyrrolidone, and stirring to prepare negative electrode glue solution with the viscosity of 100-500 mpa.s;
(2) The Super-p conductive carbon black and LI435 acetylene black are mixed according to the mass ratio of 3.12:1.32, adding the formed mixed conductive agent into the positive electrode glue solution, and mixing and stirring to prepare the positive electrode mixed conductive glue with the viscosity of 2000-3000 mpa.s; the Super-p conductive carbon black and LI435 acetylene black are mixed according to the mass ratio of 2.06:1.40, adding the mixed conductive agent formed in the step of mixing and stirring to prepare the negative electrode mixed conductive adhesive with the viscosity of 1000-2000 mpa.s;
(3) Adding ternary material KP-05T3 into the positive electrode mixed conductive adhesive, adding N-methyl pyrrolidone, mixing and stirring to prepare positive electrode mixed conductive agent slurry with the viscosity of 9000-18000 mpa.s; adding lithium titanate into the negative electrode mixed conductive adhesive, adding N-methyl pyrrolidone, mixing and stirring to prepare negative electrode mixed conductive agent slurry with the viscosity of 10000-20000 mpa.s, and finishing positive electrode pulping and negative electrode pulping;
the addition amount of the polyvinylidene fluoride HSV900 in the step (1) is 2.12 percent and the addition amount of the N-methyl pyrrolidone is 34.02 percent by taking the raw materials into account for the mass percent of the positive electrode mixed conductive agent slurry; the addition amount of the ternary material KP-05T3 in the step (3) is 53.59 percent, and the addition amount of the N-methyl pyrrolidone is 8.04 percent; the balance of the addition amount of the mixed conductive agent added to the positive electrode glue solution in the step (2);
the addition amount of polyvinylidene fluoride HSV900 in the step (1) is 1.64%, the addition amount of oxalic acid is 0.13% and the addition amount of N-methylpyrrolidone is 31.84% by mass percent of the raw materials accounting for the negative electrode mixed conductive agent slurry; the addition amount of lithium titanate in the step (3) is 41.51 percent, and the addition amount of N-methyl pyrrolidone is 23.15 percent; the balance being the addition amount of the mixed conductive agent added to the negative electrode glue solution in the step (2).
And preparing a battery after the positive and negative electrode mixed conductive agent slurry is pulped, and testing the electrochemical performance of the battery prepared from the mixed conductive agent slurry. At 256g/m 2 The surface density of the anode is coated by anode mixed conductive agent slurry to produce a double-sided anode sheet, the anode sheet after anode coating is rolled with the thickness of 91 mu m, and then the anode sheet is divided into two parts by slitting; at 214g/m 2 The surface density of the anode is coated by adopting anode mixed conductive agent slurry to produce a double-sided anode piece, the anode piece after anode coating is rolled with the thickness of 128 mu m, and then the anode piece is divided into two parts by slitting; then the produced positive pole piece and negative pole piece are coiled into a coiled body bare cell by adding a diaphragm in a full-lug mode, the coiled body bare cell is assembled into a single cell by welding, and the cell passes through high-fidelityFilling liquid after air baking, standing at high temperature to thoroughly infiltrate the diaphragm and the positive and negative electrode plates, standing, performing chemical conversion to charge and discharge the battery to thoroughly activate the battery, sealing, performing capacity division after sealing, performing charge and discharge again on the battery, and finally performing capacity division and warehousing to obtain a finished single battery, namely NTO46180-27Ah, wherein the single battery is respectively numbered 10008, 10012, 10030, 10002, 10007, 10015, 10001, 10022 and 10025 (arranged according to test types and the sequence is irrelevant to numerical values of the reference numbers) according to the prepared NTO46180-27Ah battery batches.
The 2C high temperature cycle performance of the NTO46180-27Ah battery is tested, and the test flow is as follows:
a. discharging the battery according to a standard discharging mode under the condition of 55 ℃; b. standing for 10min; c. constant current charging to 2.9V with a current of 2I1 (a); d. standing for 10min; e. constant current discharge to 1.5V at a current of 2I1 (a); f. jumping to b, and circulating 6000 times; g. constant current charging to 2.3V with a current of 1I1 (a); h.2.3V constant voltage charging, limiting time is 60min, and limiting current is 0.450A.
The high-temperature cycle performance tests of NTO46180-27Ah batteries 2C with the numbers of 10008, 10012 and 10030 show that the cycle times of 10008, 10012 and 10030 are 591 cycles, 616 cycles and 600 cycles respectively, and the capacity retention rates are 98.97%, 97.80% and 100.13% respectively, as shown in figures 1-3. From the above graph, the battery is tested by 2C high temperature cycle, and the cycle and capacity retention rate are high, so the cycle life of the three batteries is long.
The 0.3C low-temperature charging performance of the NTO46180-27Ah battery is tested, and the test flow is as follows: a. discharging the battery according to a standard discharging mode under the condition of 25 ℃; b. standing for 10min; c. constant current charging to 2.9V with a current of 1I1 (a); d. standing for 10min; e. constant current discharge to 1.5V at a current of 1I1 (a); f. skipping to b, and circulating for 3 times; g. the cell was left to stand for 24 hours at the temperature tested; h. the battery is charged to a cut-off voltage of 2.9V at the tested temperature with the current of nI1 (A); i. capacity retention rate: the actual charge capacity/normal temperature 1I1 (A) charge capacity is 100%, the tested temperature is less than or equal to-30 ℃, n=1/3, the tested temperature is more than or equal to-20 ℃, and n=1.
The test results of 0.3C low-temperature charging performance of NTO46180-27Ah batteries with the numbers 10002, 10007 and 10015 at-40 ℃ are shown in figures 4-6, and the charge capacity retention rates of 10002, 10007 and 10015 at-40 ℃ are 58.63%, 61.12% and 58.64% respectively. The figure shows that the batteries have higher charge capacity retention rate after being subjected to a-40 ℃/0.3C charging test, so that the three batteries have good low-temperature charging performance.
The 0.3C low-temperature discharge performance of the NTO46180-27Ah battery is tested, and the test flow is as follows: a. discharging the battery according to a standard discharging mode under the condition of 25 ℃; b. standing for 10min; c. constant current charging to 2.9V with a current of 1I1 (a); d. standing for 10min; e. constant current discharge to 1.5V at a current of 1I1 (a); f. skipping to b, and circulating for 3 times; g. the cell was left to stand for 24 hours at the temperature tested; h. discharging the battery to a cut-off voltage of 2.9V at a current of nI1 (A) at a test temperature; i. capacity retention rate: the actual discharge capacity/normal temperature 1I1 (A) discharge capacity is 100%, the tested temperature is less than or equal to-30 ℃, n=1/3, the tested temperature is more than or equal to-20 ℃, and n=1.
The test results of 0.3C low-temperature discharge performance of NTO46180-27Ah batteries with the numbers 10002, 10007 and 10015 at-40 ℃ are shown in figures 7-9, and the discharge capacity retention rates of 10002, 10007 and 10015 at-40 ℃ to 1.2V are 48.06%, 49.36% and 47.19% respectively. The graph shows that the discharge capacity retention rate of the batteries is higher after the discharge test at-40 ℃/0.3C, so that the low-temperature discharge performance of the three batteries is good.
And (3) performing 1-8C rate charging test on the NTO46180-27Ah battery, wherein the test flow is as follows: a. at room temperature, charging the battery in a standard charging mode; b. the battery 1I1 (a) current is discharged to 1.5V; c. calculate discharge capacity (in Ah); d. capacity retention = actual charge capacity/initial charge capacity (%); e. after the test is finished, at room temperature, (1) the battery is charged in a standard charging mode, (2) the current of the battery 1I1 (A) is discharged to 1.5V; (3) b, the current is respectively 2I1 (A) to 10I1 (A), and a to e are repeated.
As shown in fig. 10 to 12, the 1-8C rate charge tests with numbers 10001, 10022, 10025 show that the 10001, 10022, 10025, 200A charge retention rates are 97.98%, 95.95%, 94.94%, respectively. The figure shows that the batteries have higher charge capacity retention rate after 1-8C rate charge test, so that the rate charge performance of the three batteries is good.
And (3) performing 1-8C rate discharge test on the NTO46180-27Ah battery, wherein the test flow is as follows: a. at room temperature, charging the battery in a standard charging mode; b. the battery 1I1 (a) current is discharged to 1.5V; c. calculate discharge capacity (in Ah); d. capacity retention = actual discharge capacity/initial discharge capacity (%); e. after the test is finished, at room temperature, (1) the battery is charged in a standard charging mode, (2) the current of the battery 1I1 (A) is discharged to 1.5V; (3) b, the current is respectively 2I1 (A) to 10I1 (A), and a to e are repeated.
As shown in fig. 13 to 15, the discharge tests at 1 to 8C rates of 10001, 10022, and 10025 show that the discharge retention rates of 10001, 10022, and 10025, and 200A are 97.59%, 97.06%, and 96.57%, respectively. The graph shows that the discharge capacity retention rate of the batteries is higher after the discharge test at 1-8C rate, so that the rate discharge performance of the three batteries is good.
Example 2
The pulping method of the mixed conductive agent comprises the following steps:
(1) Mixing and stirring polyvinyl alcohol and N-methyl pyrrolidone to prepare positive electrode glue solution with the viscosity of 1500-2500 mpa.s; mixing and stirring polyvinyl alcohol, oxalic acid and N-methyl pyrrolidone to prepare negative electrode glue solution with the viscosity of 100-500 mpa.s;
(2) The Super-p conductive carbon black and LI435 acetylene black are mixed according to the mass ratio of 3.00:1.27, adding the mixed conductive agent formed by the steps into the positive electrode glue solution, and mixing and stirring to prepare positive electrode mixed conductive glue with the viscosity of 2000-3000 mpa.s; the Super-p conductive carbon black and LI435 acetylene black are mixed according to the mass ratio of 2.00:1.36 adding the formed mixed conductive agent into the negative electrode glue solution, and mixing and stirring to prepare the negative electrode mixed conductive glue with the viscosity of 1000-2000 mpa.s;
(3) Adding lithium cobaltate into the positive electrode mixed conductive adhesive, adding N-methyl pyrrolidone, mixing and stirring to prepare positive electrode mixed conductive agent slurry with the viscosity of 9000-18000 mpa.s; adding graphite into the negative electrode mixed conductive adhesive, adding N-methyl pyrrolidone, mixing and stirring to prepare negative electrode mixed conductive agent slurry with the viscosity of 10000-20000 mpa.s, and finishing positive electrode pulping and negative electrode pulping;
the raw materials account for 2.0 percent of the mass percent of the positive electrode mixed conductive agent slurry, and the addition amount of the polyvinyl alcohol in the step (1) is 33 percent of the addition amount of the N-methyl pyrrolidone; the addition amount of lithium cobaltate in the step (3) is 55 percent, and the addition amount of N-methyl pyrrolidone is 8.5 percent; the balance of the addition amount of the mixed conductive agent added to the positive electrode glue solution in the step (2);
the raw materials account for 1.5% of the mass percentage of the anode mixed conductive agent slurry, the added amount of polyvinyl alcohol in the step (1) is 0.12% of oxalic acid, and the added amount of N-methyl pyrrolidone is 31%; the addition amount of graphite in the step (3) is 39%, and the addition amount of N-methyl pyrrolidone is 24%; the balance being the addition amount of the mixed conductive agent added to the negative electrode glue solution in the step (2).
Example 3
The pulping method of the mixed conductive agent comprises the following steps:
(1) Mixing and stirring polytetrafluoroethylene and N-methyl pyrrolidone to prepare a positive electrode glue solution with the viscosity of 1500-2500 mpa.s; mixing polytetrafluoroethylene, oxalic acid and N-methyl pyrrolidone, and stirring to prepare negative electrode glue solution with the viscosity of 100-500 mpa.s;
(2) The Super-p conductive carbon black and LI435 acetylene black are mixed according to the mass ratio of 3.12:1.32, adding the formed mixed conductive agent into the positive electrode glue solution, and mixing and stirring to prepare the positive electrode mixed conductive glue with the viscosity of 2000-3000 mpa.s; super-p conductive carbon black and LI435 acetylene black are mixed according to a mass ratio of 2.11:1.43, adding the formed mixed conductive agent into the negative electrode glue solution, and mixing and stirring to prepare the negative electrode mixed conductive glue with the viscosity of 1000-2000 mpa.s;
(3) Adding lithium manganate into the positive electrode mixed conductive adhesive, adding N-methyl pyrrolidone, mixing and stirring to prepare positive electrode mixed conductive agent slurry with the viscosity of 9000-18000 mpa.s; adding silicon-carbon alloy into the negative electrode mixed conductive adhesive, adding N-methyl pyrrolidone, mixing and stirring to prepare negative electrode mixed conductive agent slurry with viscosity of 10000-20000 mpa.s, and finishing positive electrode pulping and negative electrode pulping;
the raw materials account for 2.2 percent of the mass percent of the anode mixed conductive agent slurry, and the addition amount of the polytetrafluoroethylene in the step (1) is 35 percent of the addition amount of the N-methyl pyrrolidone; the addition amount of lithium manganate in the step (3) is 50 percent, and the addition amount of N-methyl pyrrolidone is 7.5 percent; the balance of the addition amount of the mixed conductive agent added to the positive electrode glue solution in the step (2);
the raw materials account for 1.7% of the mass percentage of the anode mixed conductive agent slurry, the added amount of polytetrafluoroethylene in the step (1) is 0.14% of oxalic acid, and the added amount of N-methylpyrrolidone is 33%; the addition amount of the silicon-carbon alloy in the step (3) is 39%, and the addition amount of the N-methyl pyrrolidone is 22%; the balance being the addition amount of the mixed conductive agent added to the negative electrode glue solution in the step (2).
Example 3
(1) Mixing and stirring carboxymethyl cellulose and N-methyl pyrrolidone to prepare a positive electrode glue solution with the viscosity of 1500-2500 mpa.s; mixing and stirring carboxymethyl cellulose, oxalic acid and N-methyl pyrrolidone to prepare negative electrode glue solution with the viscosity of 100-500 mpa.s;
(2) The Super-p conductive carbon black and LI435 acetylene black are mixed according to the mass ratio of 3.12:1.32, adding the formed mixed conductive agent into the positive electrode glue solution, and mixing and stirring to prepare the positive electrode mixed conductive glue with the viscosity of 2000-3000 mpa.s; super-p conductive carbon black and LI435 acetylene black are mixed according to a mass ratio of 2.11:1.43, adding the formed mixed conductive agent into the negative electrode glue solution, and mixing and stirring to prepare the negative electrode mixed conductive glue with the viscosity of 1000-2000 mpa.s;
(3) Adding lithium iron phosphate into the positive electrode mixed conductive adhesive, adding N-methyl pyrrolidone, and mixing and stirring to prepare positive electrode mixed conductive agent slurry with the viscosity of 9000-18000 mpa.s; adding the carbon nano-tubes into the negative electrode mixed conductive adhesive, adding N-methyl pyrrolidone, mixing and stirring to prepare negative electrode mixed conductive agent slurry with the viscosity of 10000-20000 mpa.s, and finishing positive electrode pulping and negative electrode pulping;
the raw materials account for 2.2 percent of the mass percent of the positive electrode mixed conductive agent slurry, and the addition amount of the carboxymethyl cellulose in the step (1) is 35 percent of the addition amount of the N-methyl pyrrolidone; the addition amount of lithium iron phosphate in the step (3) is 50 percent, and the addition amount of N-methyl pyrrolidone is 7.5 percent; the balance of the addition amount of the mixed conductive agent added to the positive electrode glue solution in the step (2);
the raw materials account for 1.5% of the mass percentage of the anode mixed conductive agent slurry, the addition amount of carboxymethyl cellulose in the step (1) is 0.12%, and the addition amount of oxalic acid is 31%; the adding amount of the carbon nano-tube in the step (3) is 44%, and the adding amount of the N-methyl pyrrolidone is 22%; the balance being the addition amount of the mixed conductive agent added to the negative electrode glue solution in the step (2).
Example 4
The pulping method of the mixed conductive agent comprises the following steps:
(1) Mixing and stirring styrene-butadiene rubber and N-methyl pyrrolidone to prepare a positive electrode glue solution with the viscosity of 1500-2500 mpa.s; mixing and stirring styrene-butadiene rubber, oxalic acid and N-methyl pyrrolidone to prepare negative electrode glue solution with the viscosity of 100-500 mpa.s;
(2) The Super-p conductive carbon black and LI435 acetylene black are mixed according to the mass ratio of 3.12:1.32, adding the formed mixed conductive agent into the positive electrode glue solution, and mixing and stirring to prepare the positive electrode mixed conductive glue with the viscosity of 2000-3000 mpa.s; the Super-p conductive carbon black and LI435 acetylene black are mixed according to the mass ratio of 2.06:1.40, adding the mixed conductive agent formed in the step of mixing and stirring to prepare the negative electrode mixed conductive adhesive with the viscosity of 1000-2000 mpa.s;
(3) Adding ternary material KP-05T3 into the positive electrode mixed conductive adhesive, adding N-methyl pyrrolidone, mixing and stirring to prepare positive electrode mixed conductive agent slurry with the viscosity of 9000-18000 mpa.s; adding lithium titanate into the negative electrode mixed conductive adhesive, adding N-methyl pyrrolidone, mixing and stirring to prepare negative electrode mixed conductive agent slurry with the viscosity of 10000-20000 mpa.s, and finishing positive electrode pulping and negative electrode pulping;
the addition amount of the styrene-butadiene rubber in the step (1) is 2.12 percent and the addition amount of the N-methyl pyrrolidone is 34.02 percent by taking the raw materials as mass percent of the positive electrode mixed conductive agent slurry; the addition amount of the ternary material KP-05T3 in the step (3) is 53.59 percent, and the addition amount of the N-methyl pyrrolidone is 8.04 percent; the balance of the addition amount of the mixed conductive agent added to the positive electrode glue solution in the step (2);
the raw materials account for 1.64% of the mass percentage of the anode mixed conductive agent slurry, the addition amount of styrene butadiene rubber in the step (1) is 0.13%, and the addition amount of oxalic acid is 31.84%; the addition amount of lithium titanate in the step (3) is 41.51 percent, and the addition amount of N-methyl pyrrolidone is 23.15 percent; the balance being the addition amount of the mixed conductive agent added to the negative electrode glue solution in the step (2).
Example 5
The pulping method of the mixed conductive agent comprises the following steps:
(1) Mixing and stirring the fluorinated rubber and N-methylpyrrolidone to prepare a positive electrode glue solution with the viscosity of 1500-2500 mpa.s; mixing and stirring fluorinated rubber, oxalic acid and N-methyl pyrrolidone to prepare negative electrode glue solution with the viscosity of 100-500 mpa.s;
(2) The Super-p conductive carbon black and LI435 acetylene black are mixed according to the mass ratio of 3.12:1.32, adding the formed mixed conductive agent into the positive electrode glue solution, and mixing and stirring to prepare the positive electrode mixed conductive glue with the viscosity of 2000-3000 mpa.s; the Super-p conductive carbon black and LI435 acetylene black are mixed according to the mass ratio of 2.06:1.40, adding the mixed conductive agent formed in the step of mixing and stirring to prepare the negative electrode mixed conductive adhesive with the viscosity of 1000-2000 mpa.s;
(3) Adding ternary material KP-05T3 into the positive electrode mixed conductive adhesive, adding N-methyl pyrrolidone, mixing and stirring to prepare positive electrode mixed conductive agent slurry with the viscosity of 9000-18000 mpa.s; adding lithium titanate into the negative electrode mixed conductive adhesive, adding N-methyl pyrrolidone, mixing and stirring to prepare negative electrode mixed conductive agent slurry with the viscosity of 10000-20000 mpa.s, and finishing positive electrode pulping and negative electrode pulping;
the addition amount of the fluorinated rubber in the step (1) is 2.12 percent and the addition amount of the N-methylpyrrolidone is 34.02 percent by taking the raw materials as mass percent of the positive electrode mixed conductive agent slurry; the addition amount of the ternary material KP-05T3 in the step (3) is 53.59 percent, and the addition amount of the N-methyl pyrrolidone is 8.04 percent; the balance of the addition amount of the mixed conductive agent added to the positive electrode glue solution in the step (2);
the raw materials account for 1.64% of the mass of the anode mixed conductive agent slurry, the addition amount of the fluorinated rubber in the step (1) is 0.13%, and the addition amount of the oxalic acid is 31.84%; the addition amount of lithium titanate in the step (3) is 41.51 percent, and the addition amount of N-methyl pyrrolidone is 23.15 percent; the balance being the addition amount of the mixed conductive agent added to the negative electrode glue solution in the step (2).
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (9)
1. A method for pulping a mixed conductive agent, comprising the steps of:
(1) Uniformly mixing the adhesive and the solvent to obtain an anode glue solution; uniformly mixing the adhesive, oxalic acid and a solvent to obtain a negative electrode glue solution;
(2) Adding the mixed conductive agent to the positive electrode glue solution, and uniformly mixing to obtain positive electrode mixed conductive glue; adding the mixed conductive agent to the negative electrode glue solution, and uniformly mixing to obtain negative electrode mixed conductive glue; the mixed conductive agent is a mixture formed by Super-p conductive carbon black and LI435 acetylene black;
(3) Adding an anode active material into the anode mixed conductive adhesive, and adding a solvent to uniformly mix to obtain anode mixed conductive agent slurry; and adding the anode active material into the anode mixed conductive adhesive, adding a solvent, and uniformly mixing to obtain anode mixed conductive agent slurry, thereby completing anode pulping and anode pulping.
2. The method according to claim 1, characterized in that: in the step (1), the adhesive is at least one selected from polyvinyl alcohol, polytetrafluoroethylene, carboxymethyl cellulose, polyolefin, polyvinylidene fluoride, styrene-butadiene rubber, fluorinated rubber and polyurethane respectively in the positive electrode glue solution and the negative electrode glue solution.
3. The method according to claim 1, characterized in that: in the step (1), the viscosity range of the positive electrode glue solution is 1500-2500 mpa.s; the viscosity range of the negative electrode glue solution is 100-500 mpa.s.
4. The method according to claim 1, characterized in that: in the preparation process of the positive electrode glue solution, the mass ratio of the Super-p conductive carbon black to the LI435 acetylene black is (3.00:1.27) - (3.12:1.32); in the preparation process of the negative electrode glue solution, the mass ratio of the Super-p conductive carbon black to the LI435 acetylene black is (2.00:1.36) to (2.11:1.43).
5. The method according to claim 1, characterized in that: in the step (2), the viscosity range of the positive electrode mixed conductive adhesive is 2000-3000 mpa.s; the viscosity range of the negative electrode mixed conductive adhesive is 1000-2000 mpa.s.
6. The method according to claim 1, characterized in that: in the step (3), the positive electrode active material is at least one of lithium cobaltate, lithium manganate, lithium iron phosphate and ternary materials; the negative electrode active material is at least one of graphite, silicon-carbon alloy, tin-based composite oxide, lithium titanate and carbon nano-tube.
7. The method according to claim 1, characterized in that: in the step (3), the viscosity range of the positive electrode mixed conductive agent slurry is 9000-18000 mpa.s; the viscosity range of the anode mixed conductive agent slurry is 10000-20000 mpa.s.
8. The method according to claim 1, wherein in the preparation of the positive electrode glue solution, the addition amount of the solvent is 33% -35% and the addition amount of the adhesive is 2.0% -2.2% based on the mass percentage of the raw materials in the positive electrode mixed conductive agent slurry; in the preparation of the positive electrode mixed conductive agent slurry, the addition amount of the positive electrode active material is 50-55%, and the additional addition amount of the solvent is 7.5-8.5%; the balance being mixed conductive agent.
9. The method according to claim 1, wherein in the preparation of the negative electrode glue solution, the addition amount of the solvent is 31-33%, the addition amount of the oxalic acid is 0.12-0.14% and the addition amount of the adhesive is 1.5-1.7% based on the mass percentage of the raw materials in the negative electrode mixed conductive agent slurry; in the preparation of the anode mixed conductive agent slurry, the addition amount of an anode active material is 39-44%, and the addition amount of the solvent is 22-24%; the balance being mixed conductive agent.
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