CN111261931A - Method for rapidly determining electrolyte amount of high-compaction nickel cobalt manganese oxide lithium battery - Google Patents
Method for rapidly determining electrolyte amount of high-compaction nickel cobalt manganese oxide lithium battery Download PDFInfo
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- CN111261931A CN111261931A CN201811461194.XA CN201811461194A CN111261931A CN 111261931 A CN111261931 A CN 111261931A CN 201811461194 A CN201811461194 A CN 201811461194A CN 111261931 A CN111261931 A CN 111261931A
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- nickel cobalt
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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
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
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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
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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
- H01M10/058—Construction or manufacture
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
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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
- 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
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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
- 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
Abstract
The invention discloses a method for rapidly determining the electrolyte amount of a high-compaction nickel cobalt manganese oxide lithium battery, which is characterized in that the design capacity C is divided by a liquid retention coefficient value n (n = 420-480) within a certain range to obtain the electrolyte amount M of the high-compaction nickel cobalt manganese oxide lithium battery. When the liquid retention coefficient divided by the design capacity is smaller than the lower limit of the liquid retention coefficient range of the invention, the electrolyte amount is excessive, and the problems of corrosion and softening of the battery are caused. When the value of the liquid retention coefficient divided by the design capacity is larger than the upper limit of the liquid retention coefficient range of the invention, the amount of the electrolyte is too small, and the cycle performance of the battery is poor. The method can rapidly determine the electrolyte amount of the high-compaction nickel cobalt manganese acid lithium battery, reduces the loss caused by too much or too little electrolyte, is convenient and rapid, and can perform templated operation.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery design processes, and particularly relates to a method for quickly determining the electrolyte amount of a high-compaction nickel-cobalt lithium manganate battery.
Background
The portable mobile power supply can charge the unpowered mobile phone, the tablet personal computer and other entertainment equipment at any time, and is convenient and quick. The portable mobile power supply is low in price, does not require a discharge platform, but has extremely high requirements on capacity and safety, so that the nickel cobalt lithium manganate material with high compaction density is one of the best choices of the positive electrode materials of mobile power supply batteries, tablet personal computer batteries and smart phone batteries.
The higher the compacted density of the high-compaction lithium nickel cobalt manganese oxide positive electrode material is, the better the liquid absorption effect is than that of the low-compaction lithium nickel cobalt manganese oxide positive electrode material. Too much and too little electrolyte amount can cause certain influence to the battery: if the electrolyte amount is too small, the battery cycle performance can not meet the customer requirements; too much electrolyte can cause the battery to be soft and corroded after being exhausted, and the appearance of the battery and the Pack assembly requirements are seriously influenced.
Many people determine the electrolyte amount of the high-compaction nickel cobalt lithium manganate battery according to the experience of the electrolyte amount of the traditional low-compaction nickel cobalt lithium manganate battery, and the electrolyte amount is not too small or too large, and is just proper occasionally, so that great loss is caused to production.
The invention provides a method for rapidly determining the electrolyte amount of a high-compaction nickel cobalt manganese acid lithium battery, which can reduce huge loss caused by too much or too little electrolyte and rapidly determine the electrolyte amount at a battery design end.
Disclosure of Invention
The invention aims to provide a method for rapidly determining the electrolyte amount of a high-compaction nickel cobalt manganese acid lithium battery, and in order to realize the purpose, the invention adopts the following technical scheme:
a method for rapidly determining the electrolyte amount of a high-compaction nickel cobalt manganese oxide lithium battery comprises a liquid retention coefficient n, a battery design capacity C and an electrolyte amount M, wherein the electrolyte amount M = the battery design capacity C/the liquid retention coefficient n.
And the liquid retention coefficient n = 420-480.
The design capacity C of the battery is equal to the weight of the high-compaction nickel cobalt lithium manganate multiplied by the gram capacity of the high-compaction nickel cobalt lithium manganate in theoretical design.
The compaction density range of the high-compaction nickel cobalt lithium manganate positive plate is 3.55-3.75.
According to the invention, by dividing the design capacity C by the liquid retention coefficient value n in a certain range, when the liquid retention coefficient divided by the design capacity is smaller than the lower limit of the liquid retention coefficient range, the amount of electrolyte is excessive, and the problems of corrosion and softening of the battery are caused; when the value of the liquid retention coefficient divided by the design capacity is larger than the upper limit of the liquid retention coefficient range of the invention, the amount of the electrolyte is too small, and the cycle performance of the battery is poor.
The method can rapidly determine the electrolyte amount of the high-compaction nickel cobalt manganese acid lithium battery, reduces the loss caused by too much or too little electrolyte, is convenient and rapid, and can perform templated operation.
Drawings
FIG. 1 is a graph comparing the 0.5C rate cycle curves of example 1 and comparative examples 1 and 2.
FIG. 2 is a graph comparing the 0.5C rate cycling curves of example 2 and comparative examples 1 and 2.
FIG. 3 is a graph comparing the 0.5C rate cycling curves of example 3 and comparative examples 1 and 2.
FIG. 4 is a graph comparing the 0.5C cycle curves of example 4 and comparative examples 1 and 2.
FIG. 5 is a graph comparing the 0.5C cycle curves of example 5 and comparative examples 1 and 2.
Detailed Description
In order that the invention may be clearly and clearly understood, the invention will now be further described by way of specific examples and comparative examples:
example 1: a method for rapidly determining the electrolyte amount of a high-compaction nickel cobalt manganese oxide lithium battery comprises a liquid retention coefficient n, a battery design capacity C and the electrolyte amount M. The method specifically comprises the following steps:
liquid retention coefficient n =420
Battery design capacity C = theoretical design high compaction lithium nickel cobalt manganese oxide weight x high compaction lithium nickel cobalt manganese oxide gram capacity.
The electrolyte amount M = (theoretical design high compacted nickel cobalt lithium manganate weight multiplied by high compacted nickel cobalt lithium manganate gram capacity)/420.
The compaction density range of the high-compaction nickel cobalt lithium manganate positive plate is 3.55-3.75.
Example 2: a method for rapidly determining the electrolyte amount of a high-compaction nickel cobalt manganese oxide lithium battery comprises a liquid retention coefficient n, a battery design capacity C and the electrolyte amount M. The method specifically comprises the following steps:
liquid retention coefficient n =435
Battery design capacity C = theoretical design high compaction lithium nickel cobalt manganese oxide weight x high compaction lithium nickel cobalt manganese oxide gram capacity.
Electrolyte amount M = (theoretical design high compacted nickel cobalt lithium manganate weight multiplied by high compacted nickel cobalt lithium manganate gram capacity)/435.
The compaction density range of the high-compaction nickel cobalt lithium manganate positive plate is 3.55-3.75.
Example 3: a method for rapidly determining the electrolyte amount of a high-compaction nickel cobalt manganese oxide lithium battery comprises a liquid retention coefficient n, a battery design capacity C and the electrolyte amount M. The method specifically comprises the following steps:
liquid retention coefficient n =450
Battery design capacity C = theoretical design high compaction lithium nickel cobalt manganese oxide weight x high compaction lithium nickel cobalt manganese oxide gram capacity.
The electrolyte amount M = (theoretical design high compacted nickel cobalt lithium manganate weight multiplied by high compacted nickel cobalt lithium manganate gram capacity)/450.
The compaction density range of the high-compaction nickel cobalt lithium manganate positive plate is 3.55-3.75.
Example 4: a method for rapidly determining the electrolyte amount of a high-compaction nickel cobalt manganese oxide lithium battery comprises a liquid retention coefficient n, a battery design capacity C and the electrolyte amount M. The method specifically comprises the following steps:
liquid retention coefficient n =465
Battery design capacity C = theoretical design high compaction lithium nickel cobalt manganese oxide weight x high compaction lithium nickel cobalt manganese oxide gram capacity.
The electrolyte amount M = (the weight of the high-compaction nickel cobalt lithium manganate multiplied by the gram capacity of the high-compaction nickel cobalt lithium manganate in theoretical design)/465.
The compaction density range of the high-compaction nickel cobalt lithium manganate positive plate is 3.55-3.75.
Example 5: a method for rapidly determining the electrolyte amount of a high-compaction nickel cobalt manganese oxide lithium battery comprises a liquid retention coefficient n, a battery design capacity C and the electrolyte amount M. The method specifically comprises the following steps:
liquid retention coefficient n =480
Battery design capacity C = theoretical design high compaction lithium nickel cobalt manganese oxide weight x high compaction lithium nickel cobalt manganese oxide gram capacity.
The electrolyte amount M = (theoretical design high compacted nickel cobalt lithium manganate weight multiplied by high compacted nickel cobalt lithium manganate gram capacity)/480.
The compaction density range of the high-compaction nickel cobalt lithium manganate positive plate is 3.55-3.75.
Comparative example 1: a method for rapidly determining the electrolyte amount of a high-compaction nickel cobalt manganese oxide lithium battery comprises a liquid retention coefficient n, a battery design capacity C and the electrolyte amount M. The method specifically comprises the following steps:
liquid retention coefficient n =410
Battery design capacity C = theoretical design high compaction lithium nickel cobalt manganese oxide weight x high compaction lithium nickel cobalt manganese oxide gram capacity.
The electrolyte amount M = (theoretical design high compacted nickel cobalt lithium manganate weight multiplied by high compacted nickel cobalt lithium manganate gram capacity)/410.
The compaction density range of the high-compaction nickel cobalt lithium manganate positive plate is 3.55-3.75.
Comparative example 2: a method for rapidly determining the electrolyte amount of a high-compaction nickel cobalt manganese oxide lithium battery comprises a liquid retention coefficient n, a battery design capacity C and the electrolyte amount M. The method specifically comprises the following steps:
liquid retention coefficient n =490
Battery design capacity C = theoretical design high compaction lithium nickel cobalt manganese oxide weight x high compaction lithium nickel cobalt manganese oxide gram capacity.
Electrolyte amount M = (theoretical design high compaction nickel cobalt lithium manganate weight multiplied by high compaction nickel cobalt lithium manganate gram capacity)/490.
The compaction density range of the high-compaction nickel cobalt lithium manganate positive plate is 3.55-3.75.
The lithium ion batteries are prepared according to the liquid injection amount method of the examples and the comparative examples, the quantity of each lithium ion battery is 100pcs, the corresponding performance data of the examples and the comparative examples are compared in table 1, and the liquid injection amount value calculated according to the corresponding data of the table 1 and the capacity retention rate test result of 0.5C circulation for 300 weeks are compared in table 2.
Table 1: comparison of the corresponding Performance data for each example with the comparative example
| Item | Theoretically designing the weight g of high-compaction nickel cobalt lithium manganate | High compaction gram capacity mAh/g of nickel cobalt lithium manganate | Liquid retention coefficient mAh/g | Total battery number PCS | PCS with softened battery | Number of cells corroded PCS |
| Example 1 | 32.47 | 154 | 420 | 100 | 0 | 0 |
| Example 2 | 38.96 | 154 | 435 | 100 | 0 | 0 |
| Example 3 | 45.45 | 154 | 450 | 100 | 0 | 0 |
| Example 4 | 51.95 | 154 | 465 | 100 | 0 | 0 |
| Example 5 | 58.44 | 154 | 480 | 100 | 0 | 0 |
| Comparative example 1 | 32.47 | 154 | 410 | 100 | 3 | 3 |
| Comparative example 2 | 58.44 | 154 | 490 | 100 | 0 | 0 |
Table 2 shows the results of the tests on the injection amount and the capacity retention rate at 300 cycles at 0.5C, calculated according to the data shown in Table 1 for each example and comparative example
| Item | Designed capacity mAh | Amount of electrolyte g | Softening rate of battery | Corrosion rate of battery | Capacity retention at 0.5 |
| Example 1 | 5000 | 11.90 | 0.00% | 0.00% | 90.53% |
| Example 2 | 6000 | 13.79 | 0.00% | 0.00% | 88.73% |
| Example 3 | 7000 | 15.56 | 0.00% | 0.00% | 88.53% |
| Example 4 | 8000 | 17.20 | 0.00% | 0.00% | 86.51% |
| Example 5 | 9000 | 18.75 | 0.00% | 0.00% | 86.10% |
| Comparative example 1 | 5000 | 12.20 | 5.00% | 5.00% | 91.89% |
| Comparative example 2 | 9000 | 18.37 | 0.00% | 0.00% | 65.00% |
From the results in Table 2, the retention coefficient values of the examples 1 to 5 are between the retention coefficients 420 to 480 of the present invention, the softening and corrosion ratios of the battery are zero, and the retention rates of the 0.5C300 cycle capacity are 90.53%, 88.73%, 88.53%, 86.51% and 86.10%, respectively (the market cycle performance requirement is generally that the 0.5C300 cycle capacity retention rate is more than 80%). The liquid retention coefficient 410 of the comparative example 1 is lower than the lower line 420 of the liquid retention coefficient of the invention, the cycle capacity retention rate of 0.5C300 weeks is 91.89%, but the softening and corrosion ratios of the battery are both 3% and higher than those of the battery of the example 1 with the same design capacity. The retention coefficient 490 of comparative example 2 is higher than the retention coefficient upper line 480 of the present invention, and although the cell softening number and corrosion number are zero, the cycle capacity retention at 0.5C300 cycles is only 65.00%, which is much lower than the cycle life of example 5 of the same design capacity.
In order to clearly and intuitively show the comparison condition of the cycle performance, the cycle curves of the examples 1 to 5 and the comparative examples 1 and 2 are compared with the cycle curves of the figures 1, 2, 3, 4 and 5.
The present invention is further described in the following examples and comparative examples, which should be understood as the scope of the present invention, and it should be understood that various changes and modifications can be made by those skilled in the art without departing from the principle of the present invention.
Claims (5)
1. A method for rapidly determining the electrolyte amount of a high-compaction nickel cobalt manganese oxide lithium battery comprises a liquid retention coefficient n, a battery design capacity C and the electrolyte amount M.
2. The method is characterized in that the electrolyte amount M = the battery design capacity C/liquid retention coefficient n.
3. The method as claimed in claim 1, wherein the liquid retention coefficient n = 420-480.
4. The method of claim 1, wherein the battery design capacity C = theoretical design high compacted lithium nickel cobalt manganese oxide weight x high compacted lithium nickel cobalt manganese oxide gram capacity.
5. The method of claim 1, wherein the compacted density of the high-compaction lithium nickel cobalt manganese oxide positive plate is within a range of 3.55 to 3.75.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023004819A1 (en) * | 2021-07-30 | 2023-02-02 | 宁德时代新能源科技股份有限公司 | Secondary battery and battery module comprising same, battery pack, and electric device |
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Patent Citations (3)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023004819A1 (en) * | 2021-07-30 | 2023-02-02 | 宁德时代新能源科技股份有限公司 | Secondary battery and battery module comprising same, battery pack, and electric device |
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Application publication date: 20200609 |