CN111900338A - Preparation method of high-power thick electrode - Google Patents
Preparation method of high-power thick electrode Download PDFInfo
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- CN111900338A CN111900338A CN202010969608.0A CN202010969608A CN111900338A CN 111900338 A CN111900338 A CN 111900338A CN 202010969608 A CN202010969608 A CN 202010969608A CN 111900338 A CN111900338 A CN 111900338A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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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- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a preparation method of a high-power thick electrode, which is characterized in that a positive active material of nickel cobalt lithium manganate LiNixCoyMn1‑x‑ yO2The conductive agent, the adhesive, the solvent and the thermal sublimation material are mixed according to the weight ratio of 90-98: 1-3: 1-5: 50-90: 1-5, uniformly mixing the mixture into slurry, uniformly coating the slurry on an aluminum foil current collector, and then drying, baking and rolling to obtain the high-power thick electrode. According to the preparation method of the high-power thick electrode, the energy density of the high-power battery cell is improved, the porosity of the pole piece and the electrical property of the active material of the pole piece are not reduced, and the cost is not increased.
Description
Technical Field
The invention belongs to the technical field of lithium ion anode materials, and particularly relates to a preparation method of a high-power thick electrode.
Background
The lithium ion battery is a high-energy battery which is rapidly developed in nearly more than ten years, and has the advantages of high voltage, high specific energy, long cycle period, small environmental pollution and the like, so that the lithium ion battery is a key direction for the development of new energy industries in China at present. The anode material is an important component of the lithium ion battery and is also the part with the highest cost ratio in the lithium ion battery.
At present, due to the fact that the ternary material has high specific energy density, long endurance mileage can be brought, and the ternary material is widely concerned in new energy automobile commercial application. With the continuous reduction of the manufacturing cost of the battery core, the proportion of the ternary material power battery applied to PHEV and HEV is continuously increased, and the ternary material power battery gradually occupies the application market of the lead-acid battery. With the continuous acceleration of the replacement process, battery manufacturers have higher requirements for the capacity of the PHEV battery, and the current PHEV cell design has gradually failed to meet the requirements of the battery manufacturers on the power performance.
The current mainstream PHEV energy density boost solution is to use high capacity positive electrode material instead of existing positive electrode material, but battery life and safety are also decreasing with increasing nickel content, and at the same time cost is also increasing. The other method is a mode of improving the coating thickness of the positive plate, but the ionic conductivity of the positive plate is rapidly reduced along with the improvement of the thickness, and the porosity of the positive plate can only be improved through the pore-forming agent. However, the currently used pore-forming agent principle is to perform pore-forming by a mode that a solid material is decomposed into gas at a certain temperature, and most of the used pore-forming agent decomposition products are ammonia or gaseous organic acid substances, which have a large influence on the environment, a large amount of environmental protection facilities need to be added, and part of decomposition products are corrosive to the battery cell, so that a side reaction is generated to reduce the original performance of the battery cell.
Disclosure of Invention
In view of this, the present invention is directed to provide a method for manufacturing a high power thick electrode, which improves the energy density of a high power cell, and simultaneously ensures that the porosity of a pole piece and the electrical properties of an active material of the pole piece are not reduced, and the cost is not increased.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a process for preparing high-power thick electrode includes such steps as preparing positive electrode active substance LiNi-Co-Mn acid lithiumxCoyMn1-x-yO2The conductive agent, the adhesive, the solvent and the thermal sublimation material are mixed according to the weight ratio of 90-98: 1-3: 1-5: 50-90: 1-5 are uniformly mixed into slurry, the slurry is uniformly coated on an aluminum foil current collector, and then the high-power thick electrode is obtained after drying, baking and rolling treatment, wherein x is more than 0 and less than 1, y is more than 0 and less than 1, and x + y is more than 0 and less than 1.
Further, the thermal sublimation material is one or a mixture of several of hydroxyethyl sulfone sulfate ester materials KN-B, KN-R, KN-2B.
Further, the binder is PVDF.
Further, the solvent is NMP.
Further, the coating thickness of the slurry on the current collector is 240-600 um.
Furthermore, the drying temperature is 100-.
Furthermore, the baking temperature is 140-.
Compared with the prior art, the preparation method of the high-power thick electrode has the following advantages:
the method overcomes the defects of the prior art, the energy density of the battery cell is improved by using a method for improving the coating thickness of the positive electrode of the PHEV battery cell in a mode of using a thermal sublimation material as a pore-forming agent, the thermal sublimation material can be homogenized together with an electrode active substance, a binder and a conductive agent at normal temperature, and is coated on a current collector, and the thermal sublimation material can be physically changed and sublimated into gas at a certain temperature, so that the thermal sublimation material is separated from the coated pole piece, the pore-forming is realized, meanwhile, the original performance of the battery cell cannot be reduced due to no chemical reaction, the sublimated material can be recovered through a collecting device, the solid phase state is recovered after cooling, and the thermal sublimation material can be repeatedly utilized for many times, so that the chemical change process of the traditional pore-forming agent is omitted, and the corrosion; the increase of the manufacturing cost is controlled to the maximum extent, the great investment of environment-friendly equipment is not needed, the porosity of the pole piece and the electrical property of the active material of the pole piece are not reduced while the energy density of the high-power battery cell is improved, and the cost is not increased.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
Example 1:
the positive active material of nickel cobalt lithium manganate (LiNi)0.8Co0.1Mn0.1O2) The conductive agent, the adhesive PVDF, the solvent NMP and the solvent KN-B are mixed according to the weight ratio of 90: 3: 4: 90: 5, uniformly mixing, uniformly coating the slurry on an aluminum foil current collector, wherein the coating thickness is about 600um, drying for 6h at 120 ℃, and then baking for 0.5h at 170 ℃. After the roller compaction treatment, a coating thickness of about 489um was obtained.
The experiment shows that: the conductivity is 0.55S/cm, and the porosity is 21.93 percent. The performance of the electrode is basically the same as that of a 200um electrode plate without the method.
Example 2:
the positive active material of nickel cobalt lithium manganate (LiNi)0.6Co0.2Mn0.2O2) The conductive agent, the adhesive PVDF, the solvent NMP and the KN-R material are mixed according to the weight ratio of 98: 1: 1: 50: 2, uniformly mixing, uniformly coating the slurry on an aluminum foil current collector, wherein the coating thickness is about 500um, drying for 6h at 110 ℃, and then baking for 1h at 150 ℃. After the rolling treatment, the coating thickness is about 420 um.
The experiment shows that: the conductivity is 0.85S/cm, and the porosity is 19.95%.
Generally, the ionic conductivity of the pole piece is rapidly reduced along with the increase of the thickness of the coating, but the conductivity and the porosity of the electrode prepared by the method are basically the same as those of the pole piece of 200um which is not subjected to the method.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A preparation method of a high-power thick electrode is characterized by comprising the following steps: LiNi is the positive active material of nickel cobalt lithium manganatexCoyMn1-x-yO2The conductive agent, the adhesive, the solvent and the thermal sublimation material are mixed according to the weight ratio of 90-98: 1-3: 1-5: 50-90: 1-5 are uniformly mixed into slurry, the slurry is uniformly coated on an aluminum foil current collector, and then the aluminum foil current collector is dried and bakedAnd obtaining the high-power thick electrode after rolling treatment, wherein x is more than 0 and less than 1, y is more than 0 and less than 1, and x + y is more than 0 and less than 1.
2. The method for preparing a thick high-power electrode according to claim 1, wherein: the thermal sublimation material is one or more of hydroxyethyl sulfone sulfate materials KN-B, KN-R, KN-2B.
3. The method for preparing a thick high-power electrode according to claim 1, wherein: the binder is PVDF.
4. The method for preparing a thick high-power electrode according to claim 1, wherein: the solvent was NMP.
5. The method for preparing a thick high-power electrode according to claim 1, wherein: the coating thickness of the slurry on the current collector is 240-600 um.
6. The method for preparing a thick high-power electrode according to claim 1, wherein: the drying temperature is 100-120 ℃, and the drying time is 2-6 h.
7. The method for preparing a thick high-power electrode according to claim 1, wherein: the baking temperature is 140-.
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| CN202010969608.0A CN111900338A (en) | 2020-09-15 | 2020-09-15 | Preparation method of high-power thick electrode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115295799A (en) * | 2022-09-30 | 2022-11-04 | 武汉亿纬储能有限公司 | Positive electrode active material, lithium iron phosphate thick electrode, and preparation method and application thereof |
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| CN102127828A (en) * | 2011-01-25 | 2011-07-20 | 华南师范大学 | Porous nano carbon fiber material, lithium battery cathode material and cathode plate |
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Application publication date: 20201106 |