CN117936924A - Lithium ion battery capable of realizing stable assembly performance in atmospheric environment - Google Patents
Lithium ion battery capable of realizing stable assembly performance in atmospheric environment Download PDFInfo
- Publication number
- CN117936924A CN117936924A CN202410133823.5A CN202410133823A CN117936924A CN 117936924 A CN117936924 A CN 117936924A CN 202410133823 A CN202410133823 A CN 202410133823A CN 117936924 A CN117936924 A CN 117936924A
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- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- atmospheric environment
- hydroxypropyl methylcellulose
- assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 49
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims abstract description 28
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims abstract description 28
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims abstract description 20
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 229920001155 polypropylene Polymers 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000004743 Polypropylene Substances 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000003792 electrolyte Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 239000011244 liquid electrolyte Substances 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 229910013870 LiPF 6 Inorganic materials 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000002861 polymer material Substances 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
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- Secondary Cells (AREA)
Abstract
The utility model provides a realize steady lithium ion battery of package assembly ability under atmospheric environment which characterized in that: firstly, preparing a hydroxypropyl methyl cellulose coating diaphragm; and then completing the assembly of the hydroxypropyl methylcellulose coated diaphragm lithium ion battery in the atmospheric environment. The invention has the beneficial effects of reducing the severe environmental conditions of lithium ion battery assembly, reducing the production cost of the current commercial battery, realizing the assembly of the lithium ion battery with stable performance in the atmospheric environment, and expanding the new application field of the hydroxypropyl methylcellulose high polymer material in the lithium ion battery.
Description
Technical Field
The invention relates to a lithium ion battery capable of realizing stable assembly performance in an atmospheric environment, and belongs to the technical field of lithium ion batteries.
Background
Since the advent of lithium ion batteries, the energy density and cycling performance of lithium ion batteries have been increasingly broken through. To date, the portable electronic device, smart grid and electric automobile industries have prompted the lithium battery industry to continually innovate. However, in the lithium ion battery assembly production process, the environmental requirements are extremely high, such as dust-free workshops, water vapor and oxygen content of less than 1ppm, so that the mature commercial lithium ion battery assembly must be completed in a glove box. The initial estimation is that the high standard environmental cost of lithium ion battery assembly accounts for 10% -20% of the total cost of the lithium ion battery, which clearly greatly improves the use cost of people for lithium ion battery application terminals (such as mobile phones, electric tools, new energy automobiles and the like). Clearly, if the harsh conditions during battery assembly can be reduced, the production costs of lithium ion batteries are clearly greatly reduced. Therefore, the application introduces the hydroxypropyl methyl cellulose coating on the commercial diaphragm of the lithium ion battery to anchor the water vapor, oxygen and floating dust impurities in the air for the first time, and successfully assembles the lithium ion battery with stable performance in the atmospheric environment at home and abroad for the first time. Although the initial performance of the battery cannot be compared with that of the assembled battery in the glove box, after the battery is charged and discharged for about 370 circles, the performance of the battery is reversely superior to that of the battery in the glove box, and more importantly, the stable charge and discharge times of the assembled lithium ion battery exceeds 1000 circles, so that the requirement of all lithium ion battery application terminals on the battery charge times is completely met. The application provides an extremely important early-stage foundation for assembling the lithium ion battery with stable performance in the atmospheric environment and further improving the battery performance, and opens up a brand-new research direction of the lithium ion battery. Related researches have not yet appeared in domestic and foreign reports.
Disclosure of Invention
Technical problem to be solved
In order to reduce the severe environmental conditions of lithium ion battery assembly and control the battery cost, the invention provides a lithium ion battery with stable assembly performance in the atmospheric environment.
Technical proposal
The utility model provides a realize steady lithium ion battery of package assembly ability under atmospheric environment which characterized in that: the method comprises the following specific steps:
(1) Preparation of hydroxypropyl methylcellulose coated separator: weighing a certain mass of hydroxypropyl methylcellulose powder and a certain mass of deionized water, putting the hydroxypropyl methylcellulose powder and the deionized water into a beaker, and magnetically stirring the mixture at 65-80 ℃ for 6-8 hours to obtain uniform suspension slurry with the mass concentration of 1.0 wt%; cooling the slurry in a refrigerator at-20 ℃ for 18-24 hours to remove bubbles; the suspension was knife coated onto a commercial polypropylene (PP) membrane with a 100 micron height doctor blade to give a uniform smooth wet coating film; drying the wet film at room temperature until the surface has no water and the surface is iridescent, and then transferring the wet film into a vacuum oven to dry for one day at 50-60 ℃ to obtain a dry film with uniform coating thickness and smooth coating surface, which is named HPMC@PP;
(2) And finishing the assembly of the hydroxypropyl methylcellulose coated diaphragm lithium ion battery in the atmospheric environment: cutting the HPMC@PP dry film obtained in the step (1) into a wafer with the diameter of 19mm for later use; the positive electrode adopts an NMC811 pole piece, graphite is used as a negative electrode, the electrolyte is 60-70 mu L of commercial carbonate liquid electrolyte (1M LiPF 6/EC+DMC+EMC+1% VC), the lithium ion battery is assembled in an air atmosphere, and the battery is kept stand for 12-15 hours in a constant temperature box at 20-30 ℃, so that the lithium ion battery which realizes stable assembly performance in the atmospheric environment based on the hydroxypropyl methyl cellulose coating diaphragm is obtained.
Advantageous effects
The invention has the beneficial effects of reducing the severe environmental conditions of lithium ion battery assembly, reducing the production cost of the current commercial battery, realizing the assembly of the lithium ion battery with stable performance in the atmospheric environment, and expanding the new application field of the hydroxypropyl methylcellulose high polymer material in the lithium ion battery.
Drawings
Fig. 1 shows the performance of a lithium ion battery assembled in an atmospheric environment: the circular label corresponds to a commercial PP septum and the triangular label corresponds to an hpmc@pp septum.
Fig. 2 is the lithium ion battery performance (hpmc@pp) assembled in a glove box.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific examples:
Examples
(1) Preparation of hydroxypropyl methylcellulose coated separator: weighing a certain mass of hydroxypropyl methylcellulose powder and a certain mass of deionized water, putting the hydroxypropyl methylcellulose powder and the deionized water into a beaker, and magnetically stirring the mixture at the temperature of 80 ℃ for 8 hours to obtain uniform suspension slurry with the mass concentration of 1.0 wt.%; cooling the slurry in a refrigerator at-20 ℃ for 24 hours to remove bubbles; the suspension was knife coated onto a commercial polypropylene (PP) membrane with a 100 micron height doctor blade to give a uniform smooth wet coating film; drying the wet film at room temperature until the surface has no water and the surface is iridescent, and then transferring the wet film into a vacuum oven to dry for one day at 60 ℃ to obtain a dry film with uniform coating thickness and smooth coating surface, which is named HPMC@PP;
(2) And finishing the assembly of the hydroxypropyl methylcellulose coated diaphragm lithium ion battery in the atmospheric environment: cutting the HPMC@PP dry film obtained in the step (1) into a wafer with the diameter of 19mm for later use; the positive electrode adopts an NMC811 pole piece, graphite is used as a negative electrode, the electrolyte is 70 mu L of commercial carbonate liquid electrolyte (1 MLiPF 6/EC+DMC+EMC+1% VC), the lithium ion battery is assembled under the air atmosphere, and the battery is kept stand for 15 hours in a 30 ℃ incubator, so that the lithium ion battery which realizes stable assembly performance under the atmospheric environment based on the hydroxypropyl methyl cellulose coating diaphragm is obtained;
(3) The assembly of the commercial diaphragm lithium ion battery is completed in the atmospheric environment: cutting the purchased commercial polypropylene (PP) diaphragm into a circular sheet with the diameter of 19mm to serve as the diaphragm for standby; and the anode adopts an NMC811 pole piece, graphite is used as a cathode, the electrolyte is 70 mu L of commercial carbonate liquid electrolyte, the lithium ion battery is assembled under the air atmosphere, and the battery is kept stand for 15 hours by a 30 ℃ incubator, so that the commercial diaphragm lithium ion battery under the atmospheric environment is obtained.
Battery charge and discharge tests were performed on a new wile electronics limited high performance battery test system CT-4000 in shenzhen. The test results were: the PP diaphragm lithium ion battery assembled in the atmospheric environment has serious capacity attenuation after being cycled for less than 200 circles under the multiplying power of 1C, and the capacity is only 8.9mAh g -1; the capacity of the HPMC@PP diaphragm lithium ion assembled in the atmospheric environment is quickly reduced by 20 circles at the first multiplying power of 1C, but the cycle number can be stabilized to exceed 1000, the ultra-strong stability is shown, and the capacity is always stabilized to be about 48.0mAh g -1; the lithium ion battery assembled with HPMC@PP diaphragm in a glove box has higher cycle capacity than the corresponding lithium ion battery assembled in the atmosphere environment in the first 300 circles under the 1C multiplying power, but has the continuous attenuation trend of the capacity in the charge-discharge cycle process, and the discharge capacity is only 45.3mAh g -1 in 370 circles, which is lower than that of the assembled lithium ion battery in the atmosphere environment.
Claims (1)
1. The utility model provides a realize steady lithium ion battery of package assembly ability under atmospheric environment which characterized in that: the method comprises the following specific steps:
(1) Preparation of hydroxypropyl methylcellulose coated separator: weighing a certain mass of hydroxypropyl methylcellulose powder and a certain mass of deionized water, putting the hydroxypropyl methylcellulose powder and the deionized water into a beaker, and magnetically stirring the mixture at 65-80 ℃ for 6-8 hours to obtain uniform suspension slurry with the mass concentration of 1.0 wt%; cooling the slurry in a refrigerator at-20 ℃ for 18-24 hours to remove bubbles; the suspension was knife coated onto a commercial polypropylene (PP) membrane with a 100 micron height doctor blade to give a uniform smooth wet coating film; drying the wet film at room temperature until the surface has no water and the surface is iridescent, and then transferring the wet film into a vacuum oven to dry for one day at 50-60 ℃ to obtain a dry film with uniform coating thickness and smooth coating surface, which is named HPMC@PP;
(2) And finishing the assembly of the hydroxypropyl methylcellulose coated diaphragm lithium ion battery in the atmospheric environment: cutting the HPMC@PP dry film obtained in the step (1) into a wafer with the diameter of 19mm for later use; the positive electrode adopts an NMC811 pole piece, graphite is used as a negative electrode, the electrolyte is 60-70 mu L of commercial carbonate liquid electrolyte (1M LiPF 6/EC+DMC+EMC+1% VC), the lithium ion battery is assembled in an air atmosphere, and the battery is kept stand for 12-15 hours in a constant temperature box at 20-30 ℃, so that the lithium ion battery which realizes stable assembly performance in the atmospheric environment based on the hydroxypropyl methyl cellulose coating diaphragm is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410133823.5A CN117936924A (en) | 2024-01-31 | 2024-01-31 | Lithium ion battery capable of realizing stable assembly performance in atmospheric environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410133823.5A CN117936924A (en) | 2024-01-31 | 2024-01-31 | Lithium ion battery capable of realizing stable assembly performance in atmospheric environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117936924A true CN117936924A (en) | 2024-04-26 |
Family
ID=90759372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410133823.5A Pending CN117936924A (en) | 2024-01-31 | 2024-01-31 | Lithium ion battery capable of realizing stable assembly performance in atmospheric environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117936924A (en) |
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2024
- 2024-01-31 CN CN202410133823.5A patent/CN117936924A/en active Pending
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