CN112271276A - Processing technology for positive electrode of lithium electronic battery - Google Patents
Processing technology for positive electrode of lithium electronic battery Download PDFInfo
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- CN112271276A CN112271276A CN202011284807.4A CN202011284807A CN112271276A CN 112271276 A CN112271276 A CN 112271276A CN 202011284807 A CN202011284807 A CN 202011284807A CN 112271276 A CN112271276 A CN 112271276A
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- positive electrode
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- lithium ion
- ion battery
- processing technology
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- 238000005516 engineering process Methods 0.000 title claims abstract description 17
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims description 8
- 229910052744 lithium Inorganic materials 0.000 title claims description 8
- 239000000203 mixture Substances 0.000 claims abstract description 45
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 23
- 239000003607 modifier Substances 0.000 claims abstract description 23
- 238000000498 ball milling Methods 0.000 claims abstract description 22
- 238000001513 hot isostatic pressing Methods 0.000 claims abstract description 17
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 13
- 239000011246 composite particle Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000000462 isostatic pressing Methods 0.000 claims abstract description 11
- 230000001681 protective effect Effects 0.000 claims abstract description 11
- 239000007774 positive electrode material Substances 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 241000923606 Schistes Species 0.000 claims abstract description 8
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 claims abstract description 8
- 239000010439 graphite Substances 0.000 claims abstract description 8
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 238000004321 preservation Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 238000010000 carbonizing Methods 0.000 claims description 5
- 239000000969 carrier Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000000314 lubricant Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- 229920003023 plastic Polymers 0.000 claims description 5
- 229920000098 polyolefin Polymers 0.000 claims description 5
- 229920005672 polyolefin resin Polymers 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 5
- 239000007822 coupling agent Substances 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 4
- 229920000620 organic polymer Polymers 0.000 claims description 3
- 230000000704 physical effect Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- 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
-
- 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
- H01M4/043—Processes of manufacture in general involving compressing or compaction
-
- 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
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0433—Molding
-
- 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
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
-
- 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
Abstract
The invention discloses a positive electrode processing technology of a lithium ion battery, which comprises the following steps: mixing graphite schist with a modifier according to a mass ratio of 110: 0-40, uniformly mixing to obtain a mixture, selecting a main raw material with a proper formula, and grinding the raw material into powder according to the requirement, wherein the granularity of the powder is set according to the requirement; mixing the crystalline aluminosilicate minerals and the silicone powder according to the weight ratio of 6:1, placing the mixture into a ball milling tank for sealing, vacuumizing the ball milling tank, introducing protective gas to obtain composite particles, performing isostatic pressing treatment, and performing hot isostatic pressing treatment on the composite particles and the mixture in hot isostatic pressing equipment; according to the processing technology of the positive electrode of the lithium ion battery, the crystalline aluminosilicate mineral, the silicone powder, the graphite schist and the modifier are matched according to a certain proportion, so that the conductivity of the positive electrode material of the lithium ion battery is obviously enhanced, and the physical property of the positive electrode is more stable through isostatic pressing treatment.
Description
Technical Field
The invention relates to the field of positive electrodes of lithium ion batteries, in particular to a positive electrode processing technology of a lithium ion battery.
Background
A lithium ion battery is a secondary battery (rechargeable battery) that mainly works by lithium ion movement between a positive electrode and a negative electrode, and Li + is inserted and extracted back and forth between the two electrodes during charge and discharge: during charging, Li + is extracted from the positive electrode and is inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharging;
the main constituent materials of the lithium ion battery include electrolyte, isolating material, anode and cathode materials and the like. The positive electrode material occupies a large proportion (the mass ratio of the positive electrode material to the negative electrode material is 3: 1-4: 1), because the performance of the positive electrode material directly influences the performance of the lithium ion battery, the cost directly determines the cost of the battery.
How to improve the quality of the positive electrode of the lithium ion battery is urgent, and therefore, a positive electrode processing technology of the lithium ion battery is urgently needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the following technical scheme: a processing technology of a positive electrode of a lithium ion battery comprises the following steps:
step one, mixing graphite schist with a modifier according to a mass ratio of 110: 0-40, uniformly mixing to obtain a mixture, selecting a main raw material with a proper formula, and grinding the raw material into powder according to the requirement, wherein the granularity of the powder is set according to the requirement;
step two, mixing the crystalline aluminosilicate mineral and the silicone powder according to the weight ratio of 6:1, placing the mixture into a ball milling tank for sealing, vacuumizing the ball milling tank, and introducing protective gas to obtain composite particles;
step three, isostatic pressing treatment, namely carrying out hot isostatic pressing treatment on the composite particles and the mixture in hot isostatic pressing equipment;
crushing, namely crushing the mixture subjected to isostatic pressing treatment by using a crusher;
step five, surface modification, namely casting and molding the crushed mixture, then soaking the crushed mixture into a solvent for rinsing, sending the rinsed crushed mixture into a chemical solvent tank to remove surface oil stains, and simultaneously carrying out ultrasonic cleaning on the alloy in the oil stain removing process;
and step six, carbonizing for 15h under the protection of protective gas at the temperature of 1200-1300 ℃, and sieving with a 100-mesh sieve after crushing to obtain the lithium battery positive active material.
Preferably, the ball milling mass ratio is 22-35, and the rotating speed is 420-550 r/min, and the ball milling is carried out for 8-10 h.
Preferably, the hot isostatic pressing treatment comprises heating and pressure increasing, high-temperature section heat and pressure maintaining, pressure maintaining rapid cooling, low-temperature section heat and pressure maintaining, and cooling and pressure reducing in sequence.
Preferably, the modifier is a mixture of the polyolefin material surface modifier and the polyolefin resin by a mixer.
Preferably, the modifier is any one of a coupling agent, a surfactant, an organic polymer treating agent and an inorganic treating agent.
Preferably, the silicone powder is an ultrahigh molecular weight plastic high-efficiency lubricant without organic carriers.
Compared with the prior art, the invention has the following beneficial effects: according to the processing technology of the positive electrode of the lithium ion battery, the crystalline aluminosilicate mineral, the silicone powder, the graphite schist and the modifier are matched according to a certain proportion, so that the conductivity of the positive electrode material of the lithium ion battery is obviously enhanced, and the physical property of the positive electrode is more stable through isostatic pressing treatment.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A processing technology of a positive electrode of a lithium ion battery comprises the following steps:
step one, mixing graphite schist with a modifier according to a mass ratio of 110: 0-40, uniformly mixing to obtain a mixture, selecting a main raw material with a proper formula, and grinding the raw material into powder according to the requirement, wherein the granularity of the powder is set according to the requirement;
step two, mixing the crystalline aluminosilicate mineral and the silicone powder according to the weight ratio of 6:1, placing the mixture into a ball milling tank for sealing, vacuumizing the ball milling tank, and introducing protective gas to obtain composite particles;
step three, isostatic pressing treatment, namely carrying out hot isostatic pressing treatment on the composite particles and the mixture in hot isostatic pressing equipment;
crushing, namely crushing the mixture subjected to isostatic pressing treatment by using a crusher;
step five, surface modification, namely casting and molding the crushed mixture, then soaking the crushed mixture into a solvent for rinsing, sending the rinsed crushed mixture into a chemical solvent tank to remove surface oil stains, and simultaneously carrying out ultrasonic cleaning on the alloy in the oil stain removing process;
and step six, carbonizing for 15h under the protection of protective gas at the temperature of 1200-1300 ℃, and sieving with a 100-mesh sieve after crushing to obtain the lithium battery positive active material.
The ball milling mass ratio is 22-35, and the rotating speed is 420 and 550 revolutions per minute, and the ball milling is carried out for 8-10 h.
And the hot isostatic pressing treatment comprises heating and boosting, heat and pressure preservation in a high-temperature section, pressure-preservation rapid cooling, heat and pressure preservation in a low-temperature section and cooling and pressure reduction in sequence.
The modifier is prepared by mixing polyolefin material surface modifier with polyolefin resin with a mixer.
The modifier is any one of a coupling agent, a surfactant, an organic polymer treating agent and an inorganic treating agent.
The silicone powder is an efficient lubricant for the ultrahigh molecular weight plastics without organic carriers.
Example 1
During preparation, the processing technology of the positive electrode of the lithium ion battery comprises the following steps: mixing graphite schist with a modifier according to a mass ratio of 110: 20, uniformly mixing to obtain a mixture, selecting a main raw material with a proper formula, and grinding the raw material into powder according to requirements, wherein the granularity of the powder is set according to the requirements; mixing the crystalline aluminosilicate mineral and silicone powder according to a weight ratio of 6:1, placing the mixture into a ball milling tank for sealing, vacuumizing the ball milling tank, and introducing protective gas to obtain composite particles; carrying out hot isostatic pressing treatment on the composite particles and the mixture in a hot isostatic pressing device; crushing the mixture subjected to isostatic pressing treatment by using a crusher; firstly, casting and molding a crushed mixture, then soaking the crushed mixture into a solvent for rinsing, sending the rinsed crushed mixture into a chemical solvent tank to remove surface oil stains, and simultaneously carrying out ultrasonic cleaning on the alloy in the oil stain removing process; and carbonizing the mixture for 15h at 1200 ℃ under the protection of protective gas after the reaction is finished, and sieving the mixture through a 100-mesh sieve after the mixture is crushed to obtain the lithium battery positive electrode active material.
The ball milling mass ratio is 22, the ball milling is carried out for 8 hours under the condition that the rotating speed is 420 r/min, the hot isostatic pressing treatment comprises the steps of heating and boosting, heat and pressure preservation in a high-temperature section, pressure preservation and rapid cooling, heat and pressure preservation in a low-temperature section and cooling and pressure reduction in sequence, the modifier is obtained by mixing a polyolefin material surface modifier and polyolefin resin by using a mixing mill, the modifier uses a coupling agent, and silicone powder is an efficient lubricant for ultrahigh molecular weight plastics which does not contain organic carriers.
Through detection, the conductivity of the anode of the prepared lithium ion battery is improved by 20%, and the molecular structure is stable.
Example 2
During preparation, the graphite schist is mixed with a modifier according to the mass ratio of 110: 30, uniformly mixing to obtain a mixture, selecting a main raw material with a proper formula, and grinding the raw material into powder according to requirements, wherein the granularity of the powder is set according to the requirements; mixing the crystalline aluminosilicate mineral and silicone powder according to a weight ratio of 6:1, placing the mixture into a ball milling tank for sealing, vacuumizing the ball milling tank, and introducing protective gas to obtain composite particles; carrying out hot isostatic pressing treatment on the composite particles and the mixture in a hot isostatic pressing device; crushing the mixture subjected to isostatic pressing treatment by using a crusher; firstly, casting and molding a crushed mixture, then soaking the crushed mixture into a solvent for rinsing, sending the rinsed crushed mixture into a chemical solvent tank to remove surface oil stains, and simultaneously carrying out ultrasonic cleaning on the alloy in the oil stain removing process; and carbonizing the mixture for 15h at 1300 ℃ under the protection of protective gas after the reaction is finished, and sieving the mixture through a 100-mesh sieve after the mixture is crushed to obtain the lithium battery positive electrode active material.
Ball milling is carried out for 10 hours under the conditions that the ball milling mass ratio is 35 and the rotating speed is 550 revolutions per minute, hot isostatic pressing treatment comprises heating and pressure rising, heat preservation and pressure maintaining at a high temperature section, pressure preservation and rapid cooling, heat preservation and pressure maintaining at a low temperature section and cooling and pressure reduction which are carried out in sequence, a modifier is obtained by mixing a polyolefin material surface modifier and polyolefin resin by a mixing mill, and the modifier uses silicone powder as a surfactant to be an efficient lubricant for ultrahigh molecular weight plastics without organic carriers.
Through detection, the conductivity of the anode of the prepared lithium ion battery is improved by 25%, and the molecular structure is stable.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A processing technology of a positive electrode of a lithium ion battery is characterized in that: the processing technology of the positive electrode of the lithium ion battery comprises the following steps:
step one, mixing graphite schist with a modifier according to a mass ratio of 110: 0-40, uniformly mixing to obtain a mixture, selecting a main raw material with a proper formula, and grinding the raw material into powder according to the requirement, wherein the granularity of the powder is set according to the requirement;
step two, mixing the crystalline aluminosilicate mineral and the silicone powder according to the weight ratio of 6:1, placing the mixture into a ball milling tank for sealing, vacuumizing the ball milling tank, and introducing protective gas to obtain composite particles;
step three, isostatic pressing treatment, namely carrying out hot isostatic pressing treatment on the composite particles and the mixture in hot isostatic pressing equipment;
crushing, namely crushing the mixture subjected to isostatic pressing treatment by using a crusher;
step five, surface modification, namely casting and molding the crushed mixture, then soaking the crushed mixture into a solvent for rinsing, sending the rinsed crushed mixture into a chemical solvent tank to remove surface oil stains, and simultaneously carrying out ultrasonic cleaning on the alloy in the oil stain removing process;
and step six, carbonizing for 15h under the protection of protective gas at the temperature of 1200-1300 ℃, and sieving with a 100-mesh sieve after crushing to obtain the lithium battery positive active material.
2. The positive electrode processing technology of a lithium ion battery according to claim 1, characterized in that: the ball milling mass ratio is 22-35, and the rotating speed is 420 and 550 revolutions per minute, and the ball milling is carried out for 8-10 h.
3. The positive electrode processing technology of a lithium ion battery according to claim 1, characterized in that: and the hot isostatic pressing treatment comprises heating and boosting, heat and pressure preservation in a high-temperature section, pressure-preservation rapid cooling, heat and pressure preservation in a low-temperature section and cooling and pressure reduction in sequence.
4. The positive electrode processing technology of a lithium ion battery according to claim 1, characterized in that: the modifier is prepared by mixing the polyolefin material surface modifier with polyolefin resin by a mixer.
5. The positive electrode processing technology of a lithium ion battery according to claim 1, characterized in that: the modifier is any one of a coupling agent, a surfactant, an organic polymer treating agent and an inorganic treating agent.
6. The positive electrode processing technology of a lithium ion battery according to claim 1, characterized in that: the silicone powder is an efficient lubricant for the ultrahigh molecular weight plastics without organic carriers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011284807.4A CN112271276A (en) | 2020-11-17 | 2020-11-17 | Processing technology for positive electrode of lithium electronic battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011284807.4A CN112271276A (en) | 2020-11-17 | 2020-11-17 | Processing technology for positive electrode of lithium electronic battery |
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| CN112271276A true CN112271276A (en) | 2021-01-26 |
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| CN202011284807.4A Pending CN112271276A (en) | 2020-11-17 | 2020-11-17 | Processing technology for positive electrode of lithium electronic battery |
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2020
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