CN108346827B - Device and method for designing lithium ion battery electrolyte formula - Google Patents
Device and method for designing lithium ion battery electrolyte formula Download PDFInfo
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- CN108346827B CN108346827B CN201810370330.8A CN201810370330A CN108346827B CN 108346827 B CN108346827 B CN 108346827B CN 201810370330 A CN201810370330 A CN 201810370330A CN 108346827 B CN108346827 B CN 108346827B
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- lithium ion
- ion battery
- electrolyte
- buffer area
- clamping
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 83
- 239000003792 electrolyte Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 16
- 238000009472 formulation Methods 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000009210 therapy by ultrasound Methods 0.000 claims description 3
- 239000000654 additive Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 230000001351 cycling effect Effects 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or 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
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a device for designing a lithium ion battery electrolyte formula, which comprises a lithium ion battery, a buffer area, clamping plates and clamping pieces, wherein a long and narrow deformable channel is arranged between the lithium ion battery and the buffer area, the two clamping plates are respectively arranged on two sides of the lithium ion battery and the buffer area, and the clamping pieces are arranged on two sides of the clamping plates. The invention has the advantages that the consumption condition of the electrolyte components in the circulating process is determined according to the change of the electrolyte components in different cycles of the lithium ion battery, the actual addition amount of the electrolyte formula is determined according to the actual consumption amount of the electrolyte, the pertinence is strong, the adjustment times of the electrolyte components are obviously reduced, and the time consumed for optimizing the electrolyte formula is shortened.
Description
Technical Field
The invention relates to the field of lithium battery electrolyte production, in particular to a device and a method for designing a lithium ion battery electrolyte formula.
Background
The lithium ion battery has the advantages of high specific capacity, small self-discharge, wide working temperature range, high voltage platform, long cycle life, no memory effect, environmental friendliness and the like, and is widely applied to the fields of mobile phones, notebook computers, electric tools and the like and gradually popularized in the field of electric automobiles.
The electrolyte is the 'blood' of the lithium ion battery, and the reasonable design degree of the electrolyte formula has obvious influence on the performance of the battery, especially the long-term cycle performance. The conventional electrolyte design method is to give an initial formula according to experience, and the battery is usually cycled for 300-1000 weeks to obtain the battery cycle performance, and then evaluate and adjust the proportion of the solvent and the additive according to experience. Such design methods generally require multiple adjustments of the ratio of solvent to additive, and the time required for circulation after each adjustment of the ratio is also long, which costs a lot of time as a whole. In addition, specific actions and consumption conditions of certain solvents and additives, especially the battery after circulation, are not positioned, the internal electrolyte is dried, the analysis consumption conditions of the electrolyte are difficult to collect, and components which are partially consumed in the electrolyte cannot be reduced in a targeted manner, so that the cost of the electrolyte is increased.
Disclosure of Invention
The invention aims to: in view of the above problems, an object of the present invention is to provide an apparatus and a method for designing an electrolyte formulation of a lithium ion battery, which reduce the time consumed for optimizing the electrolyte formulation.
The technical scheme is as follows:
the utility model provides a device of design lithium ion battery electrolyte formula, includes lithium ion battery, buffer area, splint, clamping piece, lithium ion battery with be provided with long and narrow flexible passageway between the buffer area, splint set up two, set up respectively in lithium ion battery the two sides of buffer area, clamping piece set up in splint both sides, during clamping piece clamp two splint, the passageway is closed, lithium ion battery with buffer area mutually independent, clamping piece loosens two when splint, the passageway is opened, lithium ion battery with buffer area intercommunication.
Preferably, the shell, the buffer area and the channel of the lithium ion battery are formed by integrally impacting an aluminum plastic shell, the lithium ion battery area and the buffer area are formed by impacting the aluminum plastic shell, and the channel is formed between the lithium ion battery area and the buffer area, so that the manufacturing process is simple and the cost is low.
Preferably, for ease of viewing, the clamping plate is a glass plate.
Specifically, the clamping piece adopts the forked tail clamp, and the dynamics that the forked tail clamp pressed from both sides tightly is about 30kg, makes the passageway close, and lithium ion battery and buffer zone mutually independent.
The invention also discloses a method for designing the formula of the lithium ion battery electrolyte, which comprises the following steps:
step 1, the channel is arranged between the lithium ion battery and the buffer area, and sufficient electrolyte is filled in the buffer area;
step 2, closing the channel to enable the lithium ion battery and the buffer area to be mutually independent;
step 3, connecting the anode and the cathode of the lithium ion battery with charge and discharge equipment respectively to perform charge and discharge circulation;
step 4, after the lithium ion battery is subjected to charge-discharge circulation, the charge-discharge equipment is taken down, circulation is stopped, the channel is opened, and the electrolyte in the buffer area is fully mixed with the electrolyte in the lithium ion battery;
step 5, taking out the electrolyte in the buffer area, testing the component content of the electrolyte, and sealing the buffer area after sampling;
step 6, repeating the steps 2-5 to obtain electrolyte component change information under different cycle times;
and 7, determining the consumption condition of the electrolyte components in the circulation process according to the change information of the components in the electrolyte, and determining the actual addition amount of the components in the electrolyte formula according to the actual consumption amount so as to achieve the optimal electrolyte design scheme.
In the step 2, the two clamping plates are used for clamping the lithium ion battery and the buffer area, the clamping pieces are used for clamping the clamping plates, the channels are closed, and the lithium ion battery and the buffer area are mutually independent.
Specifically, in the step 4, the clamping piece and the clamping plate are loosened, the lithium ion battery is communicated with the buffer area, and the electrolyte in the buffer area is fully mixed with the electrolyte in the lithium ion battery. And carrying out ultrasonic treatment on the lithium ion battery and the buffer area, and improving the mixing speed and uniformity of the electrolyte in the lithium ion battery and the buffer area.
Specifically, in the step 5, the buffer area is sampled by using a pinhole sampler, and after the sampling is completed, the sampling area is vacuum sealed by using a packaging machine.
The beneficial effects are that: compared with the prior art, the invention has the advantages of ingenious structure, simple and convenient manufacturing process and low cost, determines the consumption condition of electrolyte components in the circulating process according to the change of electrolyte components in different cycles of the lithium ion battery, determines the actual addition amount of the electrolyte formulation according to the actual consumption amount of the electrolyte, has strong pertinence, obviously reduces the adjustment times of the electrolyte components, shortens the time consumed for optimizing the electrolyte formulation, improves the working efficiency, can pertinently adjust the electrolyte components, improves the application performance of the electrolyte and reduces the cost.
Drawings
FIG. 1 is a schematic diagram of a device for designing a lithium ion battery electrolyte formulation;
fig. 2 is a schematic structural diagram of a lithium ion battery and a buffer area;
FIG. 3 is a graph comparing the cyclic capacity retention of the original and optimized electrolyte formulations.
Detailed Description
The present invention is further illustrated in the accompanying drawings and detailed description which are to be understood as being merely illustrative of the invention and not limiting of its scope, and various modifications of the invention, which are equivalent to those skilled in the art upon reading the invention, will fall within the scope of the invention as defined in the appended claims.
As shown in fig. 1-2, a device for designing an electrolyte formula of a lithium ion battery comprises a lithium ion battery 1, a buffer area 2, a clamping plate 3, a clamping piece 4 and a channel 5. Two pits are punched on the flat aluminum plastic shell 6, namely a lithium ion battery area and a buffer area, the internal components of the lithium ion battery are arranged in the lithium ion battery area, the periphery of the lithium ion battery area and the buffer area are sealed, a buffer area 2, a channel 5 and a lithium ion battery 1 are sequentially formed from top to bottom, the channel 5 is positioned between the lithium ion battery 1 and the buffer area 2, the channel 5 enables the lithium ion battery 1 and the buffer area 2 to be kept in communication, and when the channel 5 is extruded, the side walls of the channel 5 are close to each other, so that the channel 5 is closed. For convenient observation during operation, the clamping plate 3 adopts a glass plate, and two clamping plates 3 are arranged. The lithium ion battery 1 and the buffer area 2 are vertically arranged, the buffer area 2 is positioned above the lithium ion battery 1, and the clamping plates 3 are respectively arranged on the front side surface and the rear side surface of the lithium ion battery 1 and the buffer area 2. The clamping piece 4 adopts a dovetail clamp and is fixed on the left side and the right side of the clamping plate 3. When the clamping piece 4 clamps the two clamping plates 3, the channel 5 is closed, and the lithium ion battery 1 and the buffer area 2 are mutually independent; when the clamping piece 4 releases the two clamping plates 3, the channel 5 is opened, and the lithium ion battery 1 is communicated with the buffer area.
The invention also discloses a method for designing the formula of the lithium ion battery electrolyte, which comprises the following steps:
step 1, a channel 5 is arranged between a lithium ion battery 1 and a buffer area 2, sufficient electrolyte is filled in the upper left corner of the buffer area 2 and sealed, and the initial electrolyte composition is 1mol/L LiPF 6 ，EC/DEC/EMC＝2:5:3，VC＝1％，PS＝3％，SN＝1％，FEC＝5％。
Step 2, the lithium ion battery 1 and the buffer area 2 are vertically arranged, the buffer area 2 is located above the lithium ion battery 1, the lithium ion battery 1 and the buffer area 2 are clamped by the two clamping plates 3, the clamping plates 3 are clamped by the clamping pieces 4, the channel 5 is closed, and the lithium ion battery 1 and the buffer area 2 are mutually independent.
And 3, respectively connecting the positive electrode 7 and the negative electrode 8 of the lithium ion battery 1 with charge and discharge equipment, and performing charge and discharge circulation on the lithium ion battery by using a 1/1C circulation system.
And 4, after the lithium ion battery 1 is subjected to charge-discharge circulation for 100 weeks, stopping circulation, loosening the clamping piece 4 and the clamping plate 3, communicating the lithium ion battery 1 with the buffer zone 2, placing the buffer zone 2 upwards for 24 hours, and performing ultrasonic treatment on the lithium ion battery 1 and the buffer zone 2 to fully mix electrolyte in the buffer zone 2 with electrolyte in the lithium ion battery 1.
And 5, sampling at the right upper corner of the buffer area 2 by using a GC-MS pinhole sampler, taking out the electrolyte in the buffer area 2, testing the component content of the taken electrolyte, and vacuum sealing the sampling position by using a packaging machine after the sampling is completed.
Step 6, repeating steps 2 to 5, clamping the lithium ion battery 1 and the buffer area 2 by the clamping plate 3, and performing charge and discharge cycle again to obtain electrolyte components under the charge and discharge cycle of 200 weeks, 300 weeks and 400 weeks respectively, as shown in the following table 1.
TABLE 1 composition of electrolyte for different cycles
| Category(s) | Original ratio | Cycling for 100 weeks | Cycling for 200 weeks | Cycling for 300 weeks | Cycling for 400 weeks |
| EC | 15％ | 13.8％ | 13.1％ | 12.5％ | 11.9％ |
| DEC | 37％ | 39.1％ | 40.3％ | 42.1％ | 43.9％ |
| EMC | 25％ | 26.4％ | 26.9％ | 27.2％ | 27.9％ |
| VC | 1％ | 0.4％ | 0.2％ | 0.0％ | 0.0％ |
| PS | 3％ | 2.5％ | 2.2％ | 1.6％ | 1.7％ |
| SN | 1％ | 1.1％ | 1.1％ | 1.3％ | 1.5％ |
| FEC | 5％ | 3.7％ | 3.2％ | 2.3％ | 2.1％ |
Step 7, according to the data in table 1, it can be seen that VC is consumed faster, SN is hardly consumed in the whole process, and FEC is not changed basically after 300 weeks of circulation. The data show that in the circulating process, VC is always involved in film formation and consumed, so that the content of VC can be increased, the PS and FEC additives tend to be stable after being circulated to a certain degree, the formula can be properly optimized, and SN is not changed all the time, so that the content of VC can be properly reduced. The EC consumption is faster in the aspect of solvent, the content of the EC can be properly improved, and the content of the DEC or the EMC is reduced.
The electrolyte was adjusted according to the design optimization recipe in table 2 for the consumption of solvents and additives in table 1.
Table 2 comparison of original formulation and design optimized formulation of electrolyte
| Category(s) | Original formulation | Design optimization formula |
| EC | 15％ | 18％ |
| DEC | 37％ | 36％ |
| EMC | 25％ | 24％ |
| VC | 1.0％ | 2.0％ |
| PS | 3.0％ | 2.5％ |
| SN | 1.0％ | 0.5％ |
| FEC | 5.0％ | 4.0％ |
After the electrolyte is subjected to the optimized formulation, the lithium ion battery is subjected to an application performance test, the test result is shown in figure 3, a curve 1 is the capacity retention rate of the formulation after the design optimization, and a curve 2 is the capacity retention rate of the original formulation. As can be seen from fig. 3, the additive and the solvent in the electrolyte are reasonably adjusted according to the consumption condition of each component in the circulation process, so that the circulation retention rate can be effectively improved, and the method has high feasibility. The number of times required for optimizing the electrolyte components is obviously reduced, the time required for designing the electrolyte formula of the lithium ion battery is saved, and the working efficiency is improved.
Claims (2)
1. A method for designing a lithium ion battery electrolyte formula is characterized by comprising the following steps: the device comprises a lithium ion battery (1), a buffer area (2), clamping plates (3) and clamping pieces (4), wherein a long and narrow deformable channel (5) is arranged between the lithium ion battery (1) and the buffer area (2), the two clamping plates (3) are respectively arranged on two sides of the lithium ion battery (1) and the buffer area (2), the clamping pieces (4) are arranged on two sides of the clamping plates (3), when the clamping pieces (4) clamp two clamping plates (3), the channel (5) is closed, the lithium ion battery (1) and the buffer area (2) are mutually independent, and when the clamping pieces (4) release two clamping plates (3), the channel (5) is opened, and the lithium ion battery (1) is communicated with the buffer area (2); the shell of the lithium ion battery (1), the buffer area (2) and the channel (5) are all integrally formed by adopting an aluminum plastic shell in an impact mode; the clamping plate (3) is a glass plate; the clamping piece (4) adopts a dovetail clamp, and the method comprises the following steps:
step 1, the channel (5) is arranged between the lithium ion battery (1) and the buffer area (2), and sufficient electrolyte is filled in the buffer area (2);
step 2, closing the channel (5) to enable the lithium ion battery (1) and the cache area (2) to be independent;
step 3, connecting the positive electrode and the negative electrode of the lithium ion battery (1) with charge and discharge equipment respectively, and performing charge and discharge circulation;
step 4, stopping circulation after the lithium ion battery (1) is subjected to charge-discharge circulation, and opening the channel (5), wherein the electrolyte in the buffer area (2) is fully mixed with the electrolyte in the lithium ion battery (1); loosening the clamping piece (4) and the clamping plate (3), wherein the lithium ion battery (1) is communicated with the buffer area (2), and the electrolyte in the buffer area (2) is fully mixed with the electrolyte in the lithium ion battery (1); the method also comprises the step of carrying out ultrasonic treatment on the lithium ion battery (1) and the buffer area (2);
step 5, taking out electrolyte in the buffer area (2), testing the content of components, and sealing the buffer area (2) after sampling;
step 6, repeating the steps 2-5 to obtain electrolyte component change information under different cycle times;
step 7, determining consumption conditions of electrolyte components in the circulation process according to the change information of the components in the electrolyte, and determining actual addition amount of the components in the electrolyte formula according to actual consumption amount of the electrolyte so as to achieve an optimal electrolyte design scheme;
in the step 2, two clamping plates (3) clamp the lithium ion battery (1) and the buffer area (2), the clamping plates (3) are clamped by the clamping pieces (4), the channel (5) is closed, and the lithium ion battery (1) and the buffer area (2) are mutually independent.
2. The method of designing a lithium ion battery electrolyte formulation according to claim 1, wherein: in the step 5, the buffer area (2) is sampled by a pinhole sampler, and after the sampling is completed, the sampling position is vacuum sealed by a packaging machine.
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| CN201810370330.8A CN108346827B (en) | 2018-04-24 | 2018-04-24 | Device and method for designing lithium ion battery electrolyte formula |
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| CN201810370330.8A CN108346827B (en) | 2018-04-24 | 2018-04-24 | Device and method for designing lithium ion battery electrolyte formula |
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| CN108346827B true CN108346827B (en) | 2024-01-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011222412A (en) * | 2010-04-13 | 2011-11-04 | Aisin Seiki Co Ltd | Lithium-air battery system |
| CN206497929U (en) * | 2017-02-06 | 2017-09-15 | 东莞市迈科新能源有限公司 | A kind of flexible packing lithium ion battery |
| CN107464911A (en) * | 2016-06-06 | 2017-12-12 | 万向二三股份公司 | A kind of lithium ion battery heated at constant temperature priming device and its method |
| WO2018020586A1 (en) * | 2016-07-26 | 2018-02-01 | 日立化成株式会社 | Flow battery system and power generation system |
| CN208028180U (en) * | 2018-04-24 | 2018-10-30 | 上海力信能源科技有限责任公司 | A kind of device of design lithium-ion battery electrolytes formula |
-
2018
- 2018-04-24 CN CN201810370330.8A patent/CN108346827B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011222412A (en) * | 2010-04-13 | 2011-11-04 | Aisin Seiki Co Ltd | Lithium-air battery system |
| CN107464911A (en) * | 2016-06-06 | 2017-12-12 | 万向二三股份公司 | A kind of lithium ion battery heated at constant temperature priming device and its method |
| WO2018020586A1 (en) * | 2016-07-26 | 2018-02-01 | 日立化成株式会社 | Flow battery system and power generation system |
| CN206497929U (en) * | 2017-02-06 | 2017-09-15 | 东莞市迈科新能源有限公司 | A kind of flexible packing lithium ion battery |
| CN208028180U (en) * | 2018-04-24 | 2018-10-30 | 上海力信能源科技有限责任公司 | A kind of device of design lithium-ion battery electrolytes formula |
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