CN106876792B - A kind of chemical synthesizing method of soft bag lithium ionic cell electrolyte wetting method, soft bag lithium ionic cell - Google Patents
A kind of chemical synthesizing method of soft bag lithium ionic cell electrolyte wetting method, soft bag lithium ionic cell Download PDFInfo
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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
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- 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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- 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
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Abstract
The present invention relates to a kind of soft bag lithium ionic cell electrolyte wetting methods, the chemical synthesizing method of soft bag lithium ionic cell, belong to technical field of lithium-ion battery.Soft bag lithium ionic cell electrolyte wetting method of the invention, including vacuum is stood at 0~100 DEG C after soft bag lithium ionic cell is encapsulated.In soft bag lithium ionic cell electrolyte wetting method of the invention, vacuum stand can after packaging any time section and process carry out flexible choice, and using vacuum stand can greatly shorten encapsulation after time of repose, greatly improve production efficiency；In addition, soft bag lithium ionic cell electrolyte wetting method of the invention can improve effect of impregnation, promotes the reaction of soft bag lithium ionic cell electrode interface, improve the cycle performance of lithium ion battery.
Description
Technical field
The present invention relates to a kind of soft bag lithium ionic cell electrolyte wetting method, the chemical synthesizing method of soft bag lithium ionic cell,
Belong to technical field of lithium-ion battery.
Background technique
Electrolyte needs gradually to penetrate into electrode and diaphragm after lithium ion battery liquid injection, and completion pair has both been needed after fluid injection
Lithium ion battery completes impregnation process.Currently, the infiltration technique time-consuming process of lithium ion battery, generally 8~60h.Infiltrate work
It realizes that the mode of electrolyte permeability mainly has following 3 kinds in skill: 1) encapsulation process not being done to the lithium ion battery after fluid injection, by it
It is permeated under subnormal ambient；2) lithium ion battery is put at normal temperatures and pressures after fluid injection encapsulation or welded seal
It sets, electrolyte infiltration when shelving for a long time；3) for lithium ion battery after fluid injection encapsulation or welded seal, battery is normal in high temperature
Pressure is shelved, electrolyte infiltration when shelving for a long time.The shortcomings that above existing infiltration technique generally existing low efficiency,
In addition to this, in the mode of the 1st kind of electrolyte permeability time of repose cannot it is too long otherwise increase battery moisture absorption a possibility that, and need
Want more liquid-injection equipment；The mode of 2nd kind and the 3rd kind electrolyte permeability, although reducing the time that battery is contacted with the external world,
A possibility that reducing battery moisture absorption, but there is also shelve time longer disadvantage.
Summary of the invention
The object of the present invention is to provide a kind of efficient soft bag lithium ionic cell electrolyte wetting methods, are able to solve existing
The problem of time length is shelved when infiltrating in technology to electrolyte after soft bag lithium ionic cell encapsulation.
The present invention also provides a kind of chemical synthesizing methods of soft bag lithium ionic cell.
In order to achieve the goal above, technical solution used by soft bag lithium ionic cell electrolyte wetting method of the invention
It is:
A kind of soft bag lithium ionic cell electrolyte wetting method, including at 0~100 DEG C after soft bag lithium ionic cell is encapsulated
Lower vacuum is stood.
Soft bag lithium ionic cell electrolyte wetting method of the invention carries out taking out after encapsulating soft bag lithium ionic cell true again
Sky, at this point, pressure reduces so that the gas between pole plate is easy to overflow outward inside soft bag lithium ionic cell, gas works as body from pole
After overflowing between plate, electrolyte is with regard to fully penetrated into pole plate.
In soft bag lithium ionic cell electrolyte wetting method of the invention, vacuum is stood can any time after packaging
Section and process carry out flexible choice, and stand the time of repose after capable of greatly shortening encapsulation using vacuum, greatly improve
Production efficiency；In addition, soft bag lithium ionic cell electrolyte wetting method of the invention can improve effect of impregnation, promote Soft Roll lithium
Ion battery electrode interfacial reaction improves the cycle performance of lithium ion battery.
Preferably, before packaging, first soft bag lithium ionic cell opening is vacuumized.
Preferably, the temperature that vacuum is stood is 0~75 DEG C.Vacuum stand time be 0.05~for 24 hours.
It is further preferred that being stood in vacuum environment after soft bag lithium ionic cell opening is vacuumized, then encapsulate.Soft Roll
The time that lithium ion battery opening is stood in vacuum environment after vacuumizing is no more than 0.4h.
Soft bag lithium ionic cell electrolyte wetting method of the invention, can be used to the soft bag lithium ionic cell with air bag,
It can also be used for the soft bag lithium ionic cell without air bag.When for soft bag lithium ionic cell without air bag, the lithium produced from
Sub- battery performance is not affected.
Technical solution used by the chemical synthesizing method of soft bag lithium ionic cell of the invention are as follows:
A kind of chemical synthesizing method of soft bag lithium ionic cell, comprising the following steps:
1) by vacuum is stood at 0~100 DEG C after the soft bag lithium ionic cell encapsulation with air bag；
2) the soft bag lithium ionic cell chemical conversion after standing vacuum, then air bag is punctured, it is evacuated.
The chemical synthesizing method of soft bag lithium ionic cell of the invention, the vacuum in step 1) is stood can after packaging any
Period and process carry out flexible choice, and stand the time of repose after capable of greatly shortening encapsulation using vacuum, greatly
Improve production efficiency；In addition, the chemical synthesizing method of soft bag lithium ionic cell of the invention can improve effect of impregnation, promote Soft Roll lithium
Ion battery electrode interfacial reaction improves the cycle performance of lithium ion battery.
Preferably, in step 1), before packaging, first soft bag lithium ionic cell opening is vacuumized.
It is further preferred that being stood in vacuum environment after soft bag lithium ionic cell opening is vacuumized, then encapsulate.Soft Roll
The time that lithium ion battery opening is stood in vacuum environment after vacuumizing is no more than 0.4h.
Preferably, in step 1), the temperature that vacuum is stood is 0~75 DEG C.Vacuum stand time be 0.05~for 24 hours.
Detailed description of the invention
Fig. 1 is the schematic diagram at the soft bag lithium ionic cell full electricity dismantling interface of embodiment 1；
Fig. 2 is the schematic diagram at the soft bag lithium ionic cell full electricity dismantling interface of embodiment 2；
Fig. 3 is the schematic diagram at the soft bag lithium ionic cell full electricity dismantling interface of embodiment 3；
Fig. 4 is the schematic diagram at the soft bag lithium ionic cell full electricity dismantling interface of embodiment 4；
Fig. 5 is the schematic diagram at the soft bag lithium ionic cell full electricity dismantling interface of embodiment 5；
Fig. 6 is embodiment 2, embodiment 3 and comparative example battery first charge-discharge efficiency comparison diagram；
Fig. 7 is embodiment 2, embodiment 3 and comparative example battery 1C multiplying power discharging mean voltage comparison diagram；
Fig. 8 is embodiment 2, embodiment 3 and comparative example battery 1C multiplying power discharging capacity comparison figure；
Fig. 9 is embodiment 2, embodiment 3 and comparative example battery 2C multiplying power normal-temperature circulating performance comparison diagram.
Specific embodiment
Below in conjunction with specific embodiment, the following further describes the technical solution of the present invention.
Embodiment 1
The soft bag lithium ionic cell electrolyte wetting method of the present embodiment, including giving the Soft Roll with air bag according to design quantity
Lithium ion battery fills electrolyte, and soft bag lithium ionic cell opening is vacuumized, is then encapsulated, then vacuum is stood at 0 DEG C
20h。
The chemical synthesizing method of the soft bag lithium ionic cell of the present embodiment, comprising the following steps:
1) by above-mentioned vacuum stand after soft bag lithium ionic cell under the conditions of 0.2C constant-current charge to 4.2V then constant pressure
Charge to 0.05C；
2) air bag of the soft bag lithium ionic cell after charging in step 1) is punctured, is evacuated.
After the soft bag lithium ionic cell of the present embodiment completes, full electricity dismantling cathode interface is as shown in Figure 1, it is known that cathode
Interface film forming is fine and close, fully meets the performance requirement to lithium ion battery.
Embodiment 2
The soft bag lithium ionic cell electrolyte wetting method of the present embodiment, including giving the Soft Roll with air bag according to design quantity
Lithium ion battery fills electrolyte, and soft bag lithium ionic cell opening is vacuumized and places 0.02h, is then encapsulated, then at 25 DEG C
Vacuum stands 12h.
The chemical synthesizing method of the soft bag lithium ionic cell of the present embodiment, comprising the following steps:
1) by above-mentioned vacuum stand after soft bag lithium ionic cell under the conditions of 0.2C constant-current charge to 4.2V then constant pressure
Charge to 0.05C；
2) air bag of the soft bag lithium ionic cell after charging in step 1) is punctured, is evacuated.
Completely electricity dismantling cathode interface is as shown in Figure 2 after the soft bag lithium ionic cell of the present embodiment completes, it is known that cathode
Interface film forming is fine and close, fully meets the performance requirement to lithium ion battery.
Embodiment 3
The soft bag lithium ionic cell electrolyte wetting method of the present embodiment, including giving the Soft Roll with air bag according to design quantity
Lithium ion battery fills electrolyte, and soft bag lithium ionic cell opening is vacuumized and places 0.02h, is then encapsulated, then at 40 DEG C
Vacuum stands 8h.
The chemical synthesizing method of the soft bag lithium ionic cell of the present embodiment, comprising the following steps:
1) by above-mentioned vacuum stand after soft bag lithium ionic cell under the conditions of 0.2C constant-current charge to 4.2V then constant pressure
Charge to 0.05C；
2) air bag of the soft bag lithium ionic cell after charging in step 1) is punctured, is evacuated.
After the soft bag lithium ionic cell of the present embodiment completes, full electricity dismantling cathode interface is as shown in Figure 3, it is known that cathode
Interface film forming is fine and close, fully meets the performance requirement to lithium ion battery.
Embodiment 4
The soft bag lithium ionic cell electrolyte wetting method of the present embodiment, including giving the Soft Roll with air bag according to design quantity
Lithium ion battery fills electrolyte, and soft bag lithium ionic cell opening is vacuumized and places 0.02h, is then encapsulated, then at 75 DEG C
Vacuum stands 5h.
The chemical synthesizing method of the soft bag lithium ionic cell of the present embodiment, comprising the following steps:
1) by above-mentioned vacuum stand after soft bag lithium ionic cell under the conditions of 0.2C constant-current charge to 4.2V then constant pressure
Charge to 0.05C；
2) air bag of the soft bag lithium ionic cell after charging in step 1) is punctured, is evacuated.
Completely electricity dismantling cathode interface is as shown in Figure 4 after the soft bag lithium ionic cell of the present embodiment completes, it is known that cathode
Interface film forming is fine and close, fully meets the performance requirement to lithium ion battery.
Embodiment 5
The soft bag lithium ionic cell electrolyte wetting method of the present embodiment, including giving the Soft Roll with air bag according to design quantity
Lithium ion battery fills electrolyte, and soft bag lithium ionic cell opening is vacuumized and places 0.4h, is then encapsulated, then at 100 DEG C
Vacuum stands 0.5h.
The chemical synthesizing method of the soft bag lithium ionic cell of the present embodiment, comprising the following steps:
1) by above-mentioned vacuum stand after soft bag lithium ionic cell under the conditions of 0.2C constant-current charge to 4.2V then constant pressure
Charge to 0.05C；
2) air bag of the soft bag lithium ionic cell after charging in step 1) is punctured, is evacuated.
After the soft bag lithium ionic cell of the present embodiment completes, full electricity dismantling cathode interface is as shown in Figure 5, it is known that cathode
Interface film forming is fine and close, fully meets the performance requirement to lithium ion battery.
Embodiment 6
The soft bag lithium ionic cell electrolyte wetting method of the present embodiment, including given without air bag, only according to design quantity
The soft bag lithium ionic cell filling electrolyte for leaving two envelopes encapsulation position, soft bag lithium ionic cell opening is vacuumized and places 0.4h,
Then it encapsulates, then vacuum stands 0.05h at 60 DEG C.
Embodiment 7
The soft bag lithium ionic cell electrolyte wetting method of the present embodiment, including giving according to design quantity without the soft of air bag
Packet lithium ion battery fills electrolyte, stands without opening vacuum, directly encapsulates, then vacuum stands 8h at 50 DEG C.
Embodiment 8
The soft bag lithium ionic cell electrolyte wetting method of the present embodiment, including giving the Soft Roll with air bag according to design quantity
Lithium ion battery fills electrolyte, stands without opening vacuum, directly encapsulates, then vacuum is stood for 24 hours at 10 DEG C.
Comparative example
The chemical synthesizing method of soft bag lithium ionic cell in comparative example with air bag, comprising the following steps:
1) electrolyte is filled to the soft bag lithium ionic cell with air bag according to design quantity, soft bag lithium ionic cell is open
It vacuumizes, then encapsulates, then shelve 50h at 25 DEG C；
2) by the soft bag lithium ionic cell after shelving under the conditions of 0.2C constant-current charge to 4.2V then constant-voltage charge extremely
0.05C；
3) air bag of the soft bag lithium ionic cell after charging is punctured, is evacuated.
Experimental example
Performance survey is carried out after soft bag lithium ionic cell after the chemical conversion of embodiment 2, embodiment 3 and comparative example is shelved 4~6h
Examination.
1) first charge-discharge efficiency is tested
Testing procedure:
A) soft bag lithium ionic cell after Example 2, embodiment 3 and comparative example are shelved respectively is numbered: 1 (implements
Example 2)~8 (embodiments 2)；1 (embodiment 3)~8 (embodiment 3)；1 (comparative example)~8 (comparative example)；By the Soft Roll lithium after number
Ion battery under the conditions of 0.2C constant-current charge to 4.2V then constant-voltage charge to 0.05C；
B) 10min is shelved；
C) battery that will be filled with electricity carries out constant-current discharge to 3.0V under 0.5C multiplying power；
D) first charge-discharge efficiency is calculated, test result is shown in Fig. 6；
It will be appreciated from fig. 6 that embodiment 2 is consistent with normal production result and embodiment 3 has higher first charge-discharge efficiency.
2) 1C mean voltage is tested
Mean voltage voltage value corresponding when being battery charging/discharging capacity half.1C mean voltage testing procedure:
A) soft bag lithium ionic cell respectively after the precharge of Example 2, embodiment 3 and comparative example is numbered: 1
(embodiment 2)~8 (embodiment 2)；1 (embodiment 3)~8 (embodiment 3)；1 (comparative example)~8 (comparative example)；After number
Soft bag lithium ionic cell under the conditions of 1C multiplying power constant-current charge to 4.2V then constant-voltage charge to 0.05C；
B) 10min is shelved；
C) battery that will be filled with electricity carries out constant-current discharge to 3.0V under 1C multiplying power；
D) 10min is shelved；
E) again by battery under 1C multiplying power constant-current charge to 4.2V then constant-voltage charge to 0.05C；
F) 10min is shelved；
G) terminate.
The mean voltage in charge and discharge process is recorded, test result is shown in Fig. 7.As shown in Figure 7, embodiment 2, embodiment 3 are same
The 1C mean voltage of normal production battery is consistent, and vacuum stands the mean voltage that will not influence battery.
3) 1C discharge capacity is tested
Testing procedure:
A) soft bag lithium ionic cell respectively after the precharge of Example 2, embodiment 3 and comparative example is numbered: 1
(embodiment 2)~8 (embodiment 2)；1 (embodiment 3)~8 (embodiment 3)；1 (comparative example)~8 (comparative example)；After number
Soft bag lithium ionic cell under the conditions of 1C multiplying power constant-current charge to 4.2V then constant-voltage charge to 0.05C；
B) 10min is shelved；
C) battery that will be filled with electricity carries out constant-current discharge to 3.0V under 1C multiplying power；
D) 10min is shelved；
E) again by battery under 1C multiplying power constant-current charge to 4.2V then constant-voltage charge to 0.05C；
F) 10min is shelved；
G) 1C discharge capacity is recorded, as a result sees Fig. 8.
As shown in Figure 8, embodiment 3 has and more preferably holds compared with embodiment 2, the 1C discharge capacity of normal production battery
Amount is made the most of the advantage.
4) cycle performance is tested
Soft bag lithium ionic cell after being melted into embodiment 2, embodiment 3 and comparative example is subjected to partial volume, then 25 ± 5
Under the conditions of DEG C, charge and discharge cycles test, 3.0~4.2V of charge and discharge window are carried out according to 2C/2C electric current.
Testing procedure:
A) 10min is shelved；
B) under the conditions of 2C multiplying power constant-current charge to 4.2V then constant-voltage charge to 0.05C；
C) 10min is shelved；
D) under the conditions of 2C multiplying power constant-current discharge to 3.0V；
E) 10min is shelved；
F) it is recycled 3000 weeks according to step 2 to step 5, calculates capacity retention ratio.
Test result is shown in Fig. 9, and as shown in Figure 9, the battery of embodiment 3 and embodiment 2 and comparative example all has good follow
Ring performance, significantly larger than national standard, and there is more excellent cycle performance.
Claims (1)
1. a kind of chemical synthesizing method of soft bag lithium ionic cell, it is characterised in that: the following steps are included:
1) by vacuum is stood at 25 ~ 40 DEG C after the soft bag lithium ionic cell encapsulation with air bag；It, first will be soft before the encapsulation
Packet lithium ion battery opening vacuumizes, and then encapsulates；The time that the vacuum is stood is 8 ~ 12h；
2) the soft bag lithium ionic cell chemical conversion after standing vacuum, then air bag is punctured, it is evacuated.
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| CN107895815A (en) * | 2017-10-10 | 2018-04-10 | 多氟多（焦作）新能源科技有限公司 | A kind of electrolyte wetting method of soft bag lithium ionic cell |
| CN109148988A (en) * | 2018-08-28 | 2019-01-04 | 孙战 | A kind of lithium-ion battery electrolytes rapid osmotic method |
| CN109342952B (en) * | 2018-09-26 | 2021-07-13 | 合肥国轩高科动力能源有限公司 | Lithium ion battery electrode and electrolyte interface evaluation method |
| CN109856549B (en) * | 2019-01-18 | 2021-07-13 | 合肥国轩高科动力能源有限公司 | Evaluation method of electrode cycle attenuation mechanism of lithium ion battery |
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