CN108680865A - A kind of detection method of electrolyte solution for lithium ion secondary battery cycle performance - Google Patents
A kind of detection method of electrolyte solution for lithium ion secondary battery cycle performance Download PDFInfo
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Abstract
The invention discloses a kind of detection methods of electrolyte solution for lithium ion secondary battery cycle performance, including step：The first step：For using multiple battery pole piece samples made of same material, being immersed in different electrolytes respectively；Second step：The initial weight for examining the multiple battery pole piece sample by infiltration, then carries out heating operation；Third walks：For each battery pole piece sample, every one section of preset time, i.e. the primary weight corresponding to it of real-time inspection；4th step：Calculate the volatility of the multiple battery pole piece sample corresponding different electrolytes under the different heating time；5th step：According to the volatility of the multiple battery pole piece sample corresponding different electrolytes under the different heating time, the cycle performance for the finished battery that different electrolyte is finally prepared is judged.The present invention can be detected quickly and reliably by the cycle performance of the different lithium ion batteries prepared by different electrolytes, significantly improve the efficiency to battery detecting.
Description
Technical field
The present invention relates to battery technology fields, more particularly to a kind of electrolyte solution for lithium ion secondary battery cycle performance
Detection method.
Background technology
Currently, lithium ion battery have many advantages, such as it is higher than energy, recycle often, storage time it is long, not only just
It takes such as mobile phone, DV and laptop computer on formula electronic equipment to be used widely, and is widely used in electricity
In terms of the large and medium-sized electrical equipment such as electrical automobile, electric bicycle and electric tool, therefore to the performance requirement of lithium ion battery
It is higher and higher.
For lithium ion battery, cycle life is to weigh lithium ion battery and its an important finger of interior raw material property
Mark and battery producer compare the index of concern.Therefore, the cycle performance of battery is evaluated in the short period, is had important
Meaning.Currently, for by the different lithium ion batteries prepared by different electrolytes, cycle performance of lithium ion battery is usually detected
Method needs after lithium ion battery finished product is made, then removes the cycle performance of detection battery, needs the period longer, and needs more
Secondary charge and discharge expend the more energy and time, to extend the time of battery input batch production.
Therefore, it can quickly and reliably be detected made by different electrolytes there is an urgent need to develop a kind of method is gone out at present
The cycle performance of standby different lithium ion batteries significantly saves the time of detection, improves the efficiency to battery detecting, and then promote
The mass production applications of lithium ion battery.
Invention content
In view of this, the object of the present invention is to provide a kind of detection sides of electrolyte solution for lithium ion secondary battery cycle performance
Method can be detected quickly and reliably by the cycle performance of the different lithium ion batteries prepared by different electrolytes, significantly be saved
The time of detection improves the efficiency to battery detecting, and then promotes the mass production applications of lithium ion battery, is conducive to improve electricity
The market application prospect of pond manufacturer product, is of great practical significance.
For this purpose, the present invention provides a kind of detection method of electrolyte solution for lithium ion secondary battery cycle performance, including step
Suddenly：
The first step：For using multiple battery pole piece samples made of same material, being immersed in different electrolytes respectively
In, stand predetermined time period so that the multiple battery pole piece sample complete wetting；
Second step：The initial weight of the multiple battery pole piece sample of the real-time inspection by infiltration, then to described more
A battery pole piece sample carries out heating operation；
Third walks：During heating, for each battery pole piece sample, every one section of preset time, i.e., in real time
The weight corresponding to it is examined once, until the weight of the battery pole piece sample no longer changes, while recording weight no longer
The weight of corresponding battery pole piece sample when variation；
4th step：Calculate the volatilization of the multiple battery pole piece sample corresponding different electrolytes under the different heating time
Rate；
5th step：According to the liquid volatilization of the multiple battery pole piece sample corresponding different electrolysis under the different heating time
Rate, the finished battery cycle performance prepared by the electrolyte immersed with battery pole piece sample according to electrolyte volatility are inversely proportional
Decision rule, judge following for the finished battery that the electrolyte that the multiple battery pole piece sample immerses respectively is finally prepared
Ring performance.
Wherein, in the first step, the size of the multiple battery pole piece sample is identical.
Wherein, in the first step, the predetermined time period of the standing is 30 minutes.
Wherein, in second step, by incubator or heating balance, to be heated to the multiple battery pole piece sample
Operation.
Wherein, in the third step, one section of preset time is 10 seconds.
Wherein, the 5th step is specially：It is corresponding under the different heating time according to the multiple battery pole piece sample
Electrolyte volatility, first using heating time as X-axis, the volatility with the corresponding different electrolytes of different battery pole piece samples is
Y-axis obtains the curve that different electrolyte volatilities changes with heating time, then according still further to the volatility of electrolyte and electricity
The decision rule that finished battery cycle performance prepared by solution liquid is inversely proportional, judges that the multiple battery pole piece sample is soaked respectively
The cycle performance for the finished battery that the different electrolyte entered are finally prepared.
By the above technical solution provided by the invention as it can be seen that compared with prior art, the present invention provides a kind of lithium from
The detection method of sub- secondary cell electrolyte cycle performance can quickly and reliably detect prepared by different electrolytes
Different lithium ion batteries cycle performance, significantly save the time of detection, improve to the efficiency of battery detecting, and then promote lithium
The mass production applications of ion battery are conducive to the market application prospect for improving cell production companies product, have great life
Produce practice significance.
Description of the drawings
Fig. 1 is a kind of flow of the detection method for electrolyte solution for lithium ion secondary battery cycle performance that the present invention improves
Figure；
Fig. 2 is that in embodiment, there are two types of two battery pole piece samples of different electrolyte with heating time for immersion
Variation, the curve synoptic diagram of the electrolyte volatility of corresponding acquisition；
Fig. 3 be in embodiment, immerse there are two types of different electrolyte two battery pole piece samples prepared by lithium from
Sub- battery is after actually carrying out multiple charge and discharge cycles, the cycle performance curve synoptic diagram that is obtained.
Specific implementation mode
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction with the accompanying drawings with embodiment to this
Invention is described in further detail.
Referring to Fig. 1, the present invention provides a kind of detection method of electrolyte solution for lithium ion secondary battery cycle performance, according to
The evaporation rate of electrolyte detects the cycle performance of prepared battery in the battery pole piece for be impregnated with electrolyte, specific to wrap
Include following steps：
The first step：For using multiple battery pole piece samples made of same material, being immersed in different electrolytes respectively
In (electrolyte for including different component), predetermined time period is stood so that the multiple battery pole piece sample complete wetting；
Second step：The initial weight of the multiple battery pole piece sample of the real-time inspection by infiltration, then to described more
A battery pole piece sample carries out heating operation；
Third walks：During heating, for each battery pole piece sample, every one section of preset time, i.e., in real time
The weight corresponding to it is examined once, until the weight of the battery pole piece sample no longer changes, while recording weight no longer
The weight of corresponding battery pole piece sample when variation；
4th step：It calculates and described battery pole piece sample corresponding different electrolytes under the different heating time is waved
Hair rate；
5th step：According to the volatilization of the multiple battery pole piece sample corresponding different electrolytes under the different heating time
Rate, according to the decision rule that the finished battery cycle performance prepared by electrolyte volatility and electrolyte is inversely proportional, described in judgement
The cycle performance for the finished battery that the different electrolyte that multiple battery pole piece samples immerse respectively are finally prepared.
In the first step, in specific implementation, the size of the multiple battery pole piece sample is identical.
In the present invention, the battery pole piece refers to one in positive and negative anodes active material and conductive agent, binder, dispersant
Kind or it is a variety of be mixed and made into slurry, then slurry is coated on to the lithium battery raw material being made on collector made of metal.
In the first step, in specific implementation, the predetermined time period of the standing can be 30min (minute).
It, can be by incubator or heating balance and other modes, to described more in specific implementation in second step
A battery pole piece sample carries out heating operation.
In the third step, in specific implementation, one section of preset time can be 10 seconds, certainly, according to the needs of user,
It can also be other durations.
It is right under the different heating time in order to calculate each battery pole piece sample in specific implementation in the 4th step
The electrolyte volatility answered, specific formula for calculation are as follows：
The electrolyte volatility V=(m of each battery pole piece sample0-mn)/(m0-mf)；
Wherein:m0For the initial weight of battery pole piece sample；
mnTo be spaced the battery pole piece example weight recorded after n sections of preset times, (n is to measure battery pole piece example weight
Number can take natural number 1,2,3,4 ...)；One section of preset time can be 10 seconds；
mfFor the weight being heated to when battery pole piece example weight no longer changes.
In the 5th step, it should be noted that the faster battery pole piece sample of electrolyte evaporation rate, prepared by lithium
The cycle performance of ion battery is poor.
For the present invention, the 5th step is specially：According to the multiple battery pole piece sample under the different heating time
The volatility of corresponding different electrolytes, first using heating time as X-axis, with the different corresponding different electricity of battery pole piece sample
The volatility for solving liquid is Y-axis, obtains different electrolytes (different electrolytes that i.e. different battery pole piece samples immerses respectively)
The curve that changes with heating time of volatility, then according still further to the finished battery prepared by electrolyte volatility and electrolyte
The decision rule that cycle performance is inversely proportional judges different electrolyte institutes that the multiple battery pole piece sample immerses respectively most
The cycle performance of the finished battery prepared eventually.
It should be noted that for the present invention, the scope of application is including but not limited to rectangular, round, polymer and Soft Roll
Packed battery.
Therefore, by above technical scheme it is found that for the present invention, compared with prior art, without be made battery at
Product only rely on the volatility for measuring and comparing electrolyte in pole piece, you can detect electrolyte without carrying out charge and discharge to battery
Cycle performance significantly reduces charge and discharge and uses the cost on the energy, Production Time, material.
In order to which technical scheme of the present invention is more clearly understood, illustrate with reference to specific embodiment.
First, battery pole piece sample made of same material is taken so that the size of pole piece sample is 3cm*3cm.Then,
Be immersed in respectively in two different electrolyte, and by the two battery pole piece samples be respectively labeled as battery pole piece sample A with
Pole piece sample B stands 30min.It is recommended that the control of electrolyte immersion amount is easy to measure in 5mg~500mg convenient for observation volatilization；
It should be noted that the battery pole piece sample A can include mass percent be 95% LiFePO4 LFP,
The carbon nanotube CNT of 2% Kynoar PVD and 3%；The battery pole piece sample B can be comprising mass percent
The carbon nanotube CNT of 96% LiFePO4 LFP, 2% Kynoar PVD and 2%.
Wherein, electrolyte corresponding with battery pole piece sample A can include the ethylene carbonate that mass percent is 40%
EC, 38.5% methyl ethyl carbonate EMC, 5% propene carbonate PC, 13.5% lithium hexafluoro phosphate LiPF6, 2% carbonic acid
The propylene sulfite PS of vinylene VC and 1%.
Wherein, electrolyte corresponding with battery pole piece sample B can include the ethylene carbonate that mass percent is 41.75%
Ester EC, 41.75% methyl ethyl carbonate EMC, 13.5% lithium hexafluoro phosphate LiPF6, 2% vinylene carbonate VC and 1%
Propylene sulfite PS.
Secondly, it is 80 DEG C by the temperature setting for heating balance.Pole piece after infiltration is placed in and is measured in container, is placed into pre-
On the good heating balance of heat, the initial weight m after pole piece complete wetting electrolyte is recordedA0With mB0；
Then, at interval of the 10 seconds i.e. weight of record one-shot battery pole piece sample A and B.The weight of battery pole piece sample A point
It Wei not mA1、mA2、mA3…mAn.The weight of battery pole piece sample B distinguishes mB1、mB2、mB3…mBn。
Then, battery pole piece sample A and electrolyte volatility Vs of the B under different time are calculatedA1、VA2、VA3…VAnWith
And VB1、VB2、VB3…VBn。
Then, by that will be set as X-axis heating time, volatility is set as Y-axis.Battery is drawn according to above-mentioned measurement data
The curve that the electrolyte volatility V of pole piece sample A and B change with heating time t；
Shown in curve as shown in Figure 2, the electrolyte volatility of battery pole piece sample B is higher, from next manufactured electricity
From the point of view of the circulating effect comparison diagram (Fig. 3) in pond, the cycle performance of battery pole piece sample B is on the contrary poor, actual test result and sheet
The judgement result of invention is consistent.
Equally, it should be noted that detection method of the invention can also be applied to polymer Li-ion battery, specific to examine
Survey process is similar with above-mentioned lithium ion battery, and details are not described herein.
In conclusion compared with prior art, a kind of electrolyte solution for lithium ion secondary battery cycle provided by the invention
The detection method of performance can be detected quickly and reliably by the cycle of the different lithium ion batteries prepared by different electrolytes
Performance significantly saves the time of detection, improves the efficiency to battery detecting, and then the batch production of lithium ion battery is promoted to answer
With, be conducive to improve cell production companies product market application prospect, be of great practical significance.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of detection method of electrolyte solution for lithium ion secondary battery cycle performance, which is characterized in that including step：
The first step：It is quiet for using multiple battery pole piece samples made of same material, being immersed in different electrolytes respectively
Set predetermined time period so that the multiple battery pole piece sample complete wetting；
Second step：The initial weight of the multiple battery pole piece sample of the real-time inspection by infiltration, then to the multiple electricity
Pond pole piece sample carries out heating operation；
Third walks：During heating, for each battery pole piece sample, every one section of preset time, i.e. real-time inspection
The once weight corresponding to it, until the weight of the battery pole piece sample no longer changes, while recording weight and no longer changing
When corresponding battery pole piece sample weight；
4th step：Calculate the multiple battery pole piece sample corresponding electrolyte volatility under the different heating time；
5th step：According to the volatility of the multiple battery pole piece sample corresponding different electrolytes under the different heating time,
According to the decision rule that the finished battery cycle performance prepared by electrolyte volatility and electrolyte is inversely proportional, judgement is the multiple
The cycle performance for the finished battery that the different electrolyte that battery pole piece sample immerses respectively are finally prepared.
2. detection method as described in claim 1, which is characterized in that in the first step, the multiple battery pole piece sample
Size is identical.
3. detection method as described in claim 1, which is characterized in that in the first step, the predetermined time period of the standing
It is 30 minutes.
4. detection method as described in claim 1, which is characterized in that in second step, by incubator or heating balance, come
Heating operation is carried out to the multiple battery pole piece sample.
5. detection method as described in claim 1, which is characterized in that in the third step, one section of preset time is 10 seconds.
6. the detection method as described in any one of claim 1 to 5, which is characterized in that the 5th step is specially：According to institute
The volatility for stating multiple battery pole piece sample corresponding different electrolytes under the different heating time, is first X with heating time
Axis, using the volatility of the different corresponding different electrolytes of battery pole piece sample as Y-axis, obtain different electrolyte volatilities with
The curve for heating time variation, then according still further to the finished battery cycle performance prepared by the volatility of electrolyte and electrolyte
The decision rule being inversely proportional judges that different electrolyte that the multiple battery pole piece sample immerses respectively are finally prepared
The cycle performance of finished battery.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188957A (en) * | 2021-03-26 | 2021-07-30 | 力神动力电池系统有限公司 | Method for testing electrolyte wettability of electrode plate of lithium ion secondary battery |
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