CN110518276A - Lamination lithium battery and preparation method thereof - Google Patents
Lamination lithium battery and preparation method thereof Download PDFInfo
- Publication number
- CN110518276A CN110518276A CN201910783815.4A CN201910783815A CN110518276A CN 110518276 A CN110518276 A CN 110518276A CN 201910783815 A CN201910783815 A CN 201910783815A CN 110518276 A CN110518276 A CN 110518276A
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- Prior art keywords
- lithium
- lamination
- lithium battery
- battery
- preparation
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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
-
- 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
- H01M10/058—Construction or manufacture
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses lamination lithium batteries and preparation method thereof, including high temperature to infiltrate pre- lithium cathode sheet, the screening of pre- lithium cathode sheet and lithium battery assembling；The method and step that the high temperature infiltrates pre- lithium cathode sheet is as follows: S1: suitable lithium piece in negative electrode tab double-faced uniform roll-in；S2: there is the negative electrode tab of lithium piece to be superimposed with diaphragm according to Z-shaped roll-in described in several S1 and be assembled into soft-package battery packet, and inject electrolyte and sealed, reserve enough airbags；S3: battery pack described in S2 is placed in baking oven, is stored；S4: the battery pack side after storing in S3 is dismantled, and injection dimethyl carbonate is impregnated, and battery pack is placed in baking oven again after pouring out dimethyl carbonate；S5: the battery pack in S4 is refilled into electrolyte and is sealed；S6: it repeats S3-S5 and operates 1-2 times, obtain prelithiation negative electrode tab.The present invention can be effectively improved pre- lithium effect, improve the interface problem occurred in pre- lithium battery cyclic process, improve pre- lithium battery head effect and cycle life.
Description
Technical field
The present invention relates to technical field of lithium batteries more particularly to lamination lithium battery and preparation method thereof.
Background technique
With the sharp increase in new energy market, the service life of new-energy automobile power battery has then been put on schedule.And lithium
Ion battery is during initial charge, because of the generation of negative electrode material surface SEI film, needs to be lost part lithium ion, in turn
Lose portion capacity.Cathode prelithiation is then one of the most useful means of raising lithium battery head effect, but negative electrode tab table after pre- lithium
The uniformity of the pre- lithium effect in face, which will lead to the bad phenomenons such as lithium battery interface analysis lithium, to be occurred, and the longevity of lithium battery is finally seriously affected
Life.
Existing technology some is filled the negative terminal surface by there is roll-in the cathode roller of lithium metal to immerse in electrolyte
Point lithiumation, but roll-in has the cathode roller of lithium metal after immersing electrolyte the reason of because of short-circuit pre- lithium, understands a large amount of heat production, because of heat
Amount can not discharge, and pre- lithium is caused to fail.
Summary of the invention
Technical problems based on background technology, the invention proposes lamination lithium batteries and preparation method thereof, pass through height
Temperature infiltrate pre- lithium cathode sheet battery pack, the pre- lithium cathode sheet of screening and etc. complete the uniformly pre- lithium operation of pre- lithium battery, thus effectively
It improves battery head and imitates and then improve its cycle life.
The preparation method of lamination lithium battery proposed by the present invention, including high temperature infiltrate pre- lithium cathode sheet, pre- lithium cathode sheet sieve
Choosing and lithium battery assembling.
Preferably, the high temperature infiltrate pre- lithium cathode sheet method and step it is as follows:
S1: suitable lithium piece in negative electrode tab double-faced uniform roll-in；
S2: there is the negative electrode tab of lithium piece to be superimposed with diaphragm according to Z-shaped roll-in described in several S1 and be assembled into soft-package battery
Packet, and inject electrolyte and sealed, reserve enough airbags；
S3: battery pack described in S2 is placed in baking oven, is stored；
S4: the battery pack side after storing in S3 is dismantled, and after evacuation electrolyte, injection dimethyl carbonate is soaked
It steeps, battery pack is placed in baking oven again after evacuation dimethyl carbonate；
S5: the battery pack in S4 is refilled into electrolyte and is sealed；
S6: it repeats S3-S5 and operates 1-2 times, obtain prelithiation negative electrode tab.
Preferably, the storage condition in the S3 are as follows: 45-70 DEG C of temperature, time 10-30h.
Preferably, the time that dimethyl carbonate impregnates in the S4 is 1-3min.
Preferably, the condition that battery pack described in the S4 is placed in an oven are as follows: vacuum places 10- at room temperature
30min。
Preferably, the pre- lithium cathode sheet screening criteria are as follows: screening negative electrode tab surface color is the pole piece of black.
Preferably, the high temperature infiltrates the external rings of pre- lithium cathode sheet, pre- lithium cathode sheet screening and lithium battery assembling process
Border is equipped with dew point control, and dew point control is at -50--30 DEG C.
The lamination lithium battery of method preparation of the invention.
Preferably, the lamination lithium battery includes lamination soft-package battery and lamination rectangular cell.
In the present invention, by high temperature infiltrate pre- lithium and with pre- lithium cathode sheet screening etc. processes, pre- lithium battery can be effectively improved
Pre- lithium effect and interface performance, improve the capacity and cycle life of battery, and then the A product rate in lifting capacity electricity production pond.
Detailed description of the invention
Fig. 1 is the normal temperature circulation conservation rate comparison diagram of embodiment and comparative example proposed by the present invention.
Specific embodiment
Combined with specific embodiments below the present invention is made further to explain.
Embodiment 1
The preparation method of lamination lithium battery proposed by the present invention, including high temperature infiltrate pre- lithium cathode sheet, pre- lithium cathode sheet sieve
Choosing and lithium battery assembling.
The method and step that the high temperature infiltrates pre- lithium cathode sheet is as follows:
S1: suitable lithium piece in graphite cathode piece double-faced uniform roll-in；
S2: there is the negative electrode tab of lithium piece to be superimposed with PE basement membrane diaphragm according to Z-shaped roll-in described in 6 S1 and be assembled into Soft Roll
Battery pack, and inject 30g electrolyte and sealed, reserve enough airbags；
S3: battery pack described in S2 being placed in baking oven, is stored, storage condition are as follows: temperature 45 C, time 20h；
S4: the battery pack side after storing in S3 is dismantled, and injection dimethyl carbonate carries out immersion 2min, pours out carbon
Battery pack is placed in baking oven again after dimethyl phthalate, vacuum places 20min at room temperature；
S5: the battery pack in S4 is refilled into electrolyte and is sealed；
S6: it repeats S3-S5 and operates 1 time, obtain prelithiation negative electrode tab.
Pre- lithium cathode sheet screening criteria are as follows: screening negative electrode tab surface color is the pole piece of black, and surface is any with golden yellow
Color or the pole piece in kermesinus region screen out.
Lithium battery assembling is assembled using conventional method.
The external environment that high temperature infiltrates pre- lithium cathode sheet, the screening of pre- lithium cathode sheet and lithium battery assembling process is equipped with dew point
Control, and dew point control is at -50 DEG C.
For the material of the positive and negative anodes of the application, without particular/special requirement, using existing material.
Embodiment 2
The preparation method of lamination lithium battery proposed by the present invention, including high temperature infiltrate pre- lithium cathode sheet, pre- lithium cathode sheet sieve
Choosing and lithium battery assembling.
The method and step that the high temperature infiltrates pre- lithium cathode sheet is as follows:
S1: suitable lithium piece in negative electrode tab double-faced uniform roll-in；
S2: there is the negative electrode tab of lithium piece to be superimposed with diaphragm according to Z-shaped roll-in described in 6 S1 and be assembled into soft-package battery
Packet, and inject 30g electrolyte and sealed, reserve enough airbags；
S3: battery pack described in S2 being placed in baking oven, is stored, storage condition are as follows: 55 DEG C of temperature, time 10h；
S4: the battery pack side after storing in S3 is dismantled, and injection dimethyl carbonate carries out immersion 1min, pours out carbon
Battery pack is placed in baking oven again after dimethyl phthalate, vacuum places 10min at room temperature；
S5: the battery pack in S4 is refilled into electrolyte and is sealed；
S6: it repeats S3-S5 and operates 1 time, obtain prelithiation negative electrode tab.
Pre- lithium cathode sheet screening criteria are as follows: screening negative electrode tab surface color is the pole piece of black, and surface is any with golden yellow
Color or the pole piece in kermesinus region screen out.
Lithium battery assembling is using conventional method and tertiary cathode piece (LiNi0.6Co0.2Mn0.2O2) assembled, obtain lamination lithium
Battery.
The external environment that high temperature infiltrates pre- lithium cathode sheet, the screening of pre- lithium cathode sheet and lithium battery assembling process is equipped with dew point
Control, and dew point control is at -40 DEG C.
Embodiment 3
The preparation method of lamination lithium battery proposed by the present invention, including high temperature infiltrate pre- lithium cathode sheet, pre- lithium cathode sheet sieve
Choosing and lithium battery assembling.
The method and step that the high temperature infiltrates pre- lithium cathode sheet is as follows:
S1: suitable lithium piece in negative electrode tab double-faced uniform roll-in；
S2: there is the negative electrode tab of lithium piece to be superimposed with diaphragm according to Z-shaped roll-in described in 6 S1 and be assembled into soft-package battery
Packet, and inject 30g electrolyte and sealed, reserve enough airbags；
S3: battery pack described in S2 being placed in baking oven, is stored, storage condition are as follows: temperature 70 C, time 30h；
S4: the battery pack side after storing in S3 is dismantled, and injection dimethyl carbonate carries out immersion 3min, pours out carbon
Battery pack is placed in baking oven again after dimethyl phthalate, vacuum places 30min at room temperature；
S5: the battery pack in S4 is refilled into electrolyte and is sealed；
S6: it repeats S3-S5 and operates 2 times, obtain prelithiation negative electrode tab.
Pre- lithium cathode sheet screening criteria are as follows: screening negative electrode tab surface color is the pole piece of black, and surface is any with golden yellow
Color or the pole piece in kermesinus region screen out.
Lithium battery assembling is assembled using conventional method.
The external environment that high temperature infiltrates pre- lithium cathode sheet, the screening of pre- lithium cathode sheet and lithium battery assembling process is equipped with dew point
Control, and dew point control is at -30 DEG C.
Comparative example
6Ah ternary lamination soft-package battery is made, by suitable lithium piece in cathode pole piece double-faced uniform roll-in.Roll-in there is into lithium
The graphite cathode piece and tertiary cathode piece (LiNi of piece0.6Co0.2Mn0.2O2) it is assembled into soft-package battery, 20h, which is stood, under room temperature completes
Pre- lithium process.
1C cycle performance test is carried out at normal temperature to embodiment 1 and comparative example respectively, as a result as shown in Figure 1, from Fig. 1
In, it can be seen that pre- lithium cathode sheet battery pack is infiltrated by high temperature, pre- lithium cathode sheet is screened, lithium battery assembles at three processes
Manage later circulating battery after 650 weeks capacity retention ratio be still 96.5%, and the negative electrode tab direct-assembling after the appropriate lithium piece of roll-in
After battery, cycle performance is poor, and conservation rate just has been reduced to 80% within 550 weeks.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (9)
1. the preparation method of lamination lithium battery, which is characterized in that including high temperature infiltrate pre- lithium cathode sheet, the screening of pre- lithium cathode sheet and
Lithium battery assembling.
2. the preparation method of lamination lithium battery according to claim 1, which is characterized in that the high temperature infiltrates pre- cathode of lithium
The method and step of piece is as follows:
S1: suitable lithium piece in negative electrode tab double-faced uniform roll-in；
S2: having the negative electrode tab of lithium piece to be superimposed with diaphragm according to Z-shaped roll-in described in several S1 and be assembled into soft-package battery packet, and
Injection electrolyte is sealed, and enough airbags are reserved；
S3: battery pack described in S2 is placed in baking oven, is stored；
S4: the battery pack side after storing in S3 is dismantled, and after evacuation electrolyte, injection dimethyl carbonate is impregnated,
Battery pack is placed in baking oven again after evacuation dimethyl carbonate；
S5: the battery pack in S4 is refilled into electrolyte and is sealed；
S6: it repeats S3-S5 and operates 1-2 times, obtain prelithiation negative electrode tab.
3. the preparation method of lamination lithium battery according to claim 2, which is characterized in that the storage condition in the S3
Are as follows: 45-70 DEG C of temperature, time 10-30h.
4. the preparation method of lamination lithium battery according to claim 2, which is characterized in that dimethyl carbonate soaks in the S4
The time of bubble is 1-3min.
5. the preparation method of lamination lithium battery according to claim 2, which is characterized in that battery pack described in the S4 exists
The condition placed in baking oven are as follows: vacuum places 10-30min at room temperature.
6. the preparation method of lamination lithium battery according to claim 1, which is characterized in that the pre- lithium cathode sheet screening mark
It is quasi- are as follows: screening negative electrode tab surface color is the pole piece of black.
7. the preparation method of lamination lithium battery according to claim 1, which is characterized in that the high temperature infiltrates pre- cathode of lithium
The external environment of piece, the screening of pre- lithium cathode sheet and lithium battery assembling process is equipped with dew point control, and dew point control is in -50--30
℃。
8. a kind of lamination lithium battery of the method as described in claim 1 preparation.
9. lamination lithium battery according to claim 8, which is characterized in that the lamination lithium battery includes lamination soft-package battery
With lamination rectangular cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910783815.4A CN110518276A (en) | 2019-08-23 | 2019-08-23 | Lamination lithium battery and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910783815.4A CN110518276A (en) | 2019-08-23 | 2019-08-23 | Lamination lithium battery and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN110518276A true CN110518276A (en) | 2019-11-29 |
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ID=68626479
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910783815.4A Withdrawn CN110518276A (en) | 2019-08-23 | 2019-08-23 | Lamination lithium battery and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112802995A (en) * | 2021-03-29 | 2021-05-14 | 湖北亿纬动力有限公司 | Modified negative pole piece of lithium ion battery and preparation method and application thereof |
-
2019
- 2019-08-23 CN CN201910783815.4A patent/CN110518276A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112802995A (en) * | 2021-03-29 | 2021-05-14 | 湖北亿纬动力有限公司 | Modified negative pole piece of lithium ion battery and preparation method and application thereof |
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Application publication date: 20191129 |