CN103579679B - The chemical synthesizing method of lithium iron phosphate dynamic battery - Google Patents
The chemical synthesizing method of lithium iron phosphate dynamic battery Download PDFInfo
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- CN103579679B CN103579679B CN201210283282.1A CN201210283282A CN103579679B CN 103579679 B CN103579679 B CN 103579679B CN 201210283282 A CN201210283282 A CN 201210283282A CN 103579679 B CN103579679 B CN 103579679B
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4242—Regeneration of electrolyte or reactants
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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
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Abstract
The invention discloses a kind of lithium iron phosphate dynamic battery chemical synthesizing method, comprise the following steps: S1, electrolyte is injected to electrokinetic cell and leaves standstill Preset Time; S2, extremely presets state-of-charge, then constant-current discharge to the first predeterminated voltage to the battery core of electrokinetic cell with the first predetermined current constant current charge; S3, to the battery core of electrokinetic cell with the second predetermined current constant current charge to the second predeterminated voltage, then constant-current discharge to the first predeterminated voltage, the second predetermined current is greater than the first predetermined current and the second predeterminated voltage is greater than the first predeterminated voltage; S4, to the battery core of electrokinetic cell with the 3rd predetermined current constant current charge to the 3rd predeterminated voltage, then constant-current discharge to the first predeterminated voltage, the 3rd predetermined current is greater than the first predetermined current and the 3rd predeterminated voltage is greater than the first predeterminated voltage; And S5, repeated execution of steps S4 preset times.Chemical synthesizing method provided by the invention, SEI film is stablized, and thermal stability is better, and security performance is good.
Description
Technical field
The invention belongs to technical field of lithium batteries, be specifically related to a kind of chemical synthesizing method of lithium iron phosphate dynamic battery.
Background technology
Lithium ion battery by certain charge and discharge system by its inner both positive and negative polarity substance activating, improves the charge-discharge performance of battery and the process of the combination property such as self discharge, storage, is called and changes into after manufacturing.Changing into of lithium battery is the initialization of battery, and the active material of battery can be made to activate, and this process is a very complicated process, is also affect the very important procedure of battery performance simultaneously.When lithium battery initial charge, inevitably there is irreversible chemical reaction with the organic solvent in electrolyte in lithium ion, simultaneously on the boundary of negative pole and electrolyte, form the passivation thin layer covering negative terminal surface, be referred to as SEI (SolidElectrolyteInterface, solid electrolyte interface film) film.The formation of SEI film consumes lithium ion limited in battery on the one hand, and the resistance too increasing electrode/electrolyte interface on the other hand causes certain voltage delay.After electrode surface is covered by SEI film completely, namely irreversible reaction stops, once form stable SEI film, charge and discharge process repeatedly can circulate and carry out.The optimization at the quality that SEI film is formed, stability, interface is the key factor determining that battery life is very important.Thus the stage that changes into of lithium ion battery is the committed step of connection-related electricity use tankage, self-discharge performance, cycle performance and security performance.
The chemical synthesizing method that current ferric phosphate lithium cell adopts is traditional small area analysis preliminary filling mode, although the method contributes to the formation of stable SEI film, but low current charge can cause the SEI membrane impedance formed to increase for a long time, thus affect the high rate performance of battery, charging upper limit voltage arranges unreasonable meeting and causes the destruction of material structure and the incomplete of side reaction simultaneously, affecting self discharge and the cycle performance of battery, cause battery consistency very poor, also there is hidden danger in the safety of battery.For lithium iron phosphate dynamic battery used for electric vehicle, quality and the vehicle performance of battery with two side terminals and cycle performance are closely related, existing chemical synthesizing method can not be applicable to electrokinetic cell field well, and developing a kind of reliable and stable lithium iron phosphate dynamic battery chemical synthesizing method becomes the manufacturing task of top priority of electrokinetic cell.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art.For this reason, one object of the present invention is to propose a kind of lithium iron phosphate dynamic battery chemical synthesizing method.
According to the lithium iron phosphate dynamic battery chemical synthesizing method of the embodiment of the present invention, comprise the following steps:
S1, injects electrolyte to electrokinetic cell, and leaves standstill Preset Time;
S2, to the battery core of described electrokinetic cell with the first predetermined current constant current charge to presetting state-of-charge, and after reaching described default state-of-charge constant-current discharge to the first predeterminated voltage;
S3, to the battery core of described electrokinetic cell with the second predetermined current constant current charge to the second predeterminated voltage, and after reaching described second predeterminated voltage constant-current discharge to the first predeterminated voltage, described second predetermined current is greater than described first predetermined current and described second predeterminated voltage is greater than described first predeterminated voltage;
S4, to the battery core of described electrokinetic cell with the 3rd predetermined current constant current charge to the 3rd predeterminated voltage, and after reaching described 3rd predeterminated voltage constant-current discharge to the first predeterminated voltage, the 3rd predetermined current is greater than described first predetermined current and the 3rd predeterminated voltage is greater than described first predeterminated voltage; And
S5, repeated execution of steps S4 preset times.
The chemical synthesizing method of lithium iron phosphate dynamic battery provided by the invention, leaving standstill after battery liquid-filling is that electrolyte is fully infiltrated, and makes the absorption of battery core to electrolyte more complete.Charge to default state-of-charge with the first less predetermined current, the SEI film quality that low current charge is formed and state of interface better, can suppress the increase of SEI membrane impedance simultaneously, prevent the generation of Li dendrite to the restriction in charging interval.Charging to the second predeterminated voltage with the second larger predetermined current can make negative electrode active material be activated completely, and side reaction occurs completely, reduces the time changed into, and improves the active volume of battery.Finally charging to the 3rd predeterminated voltage with the 3rd predetermined current can make SEI film tend towards stability further, and thermal stability is better, and this step that circulates can stablize SEI film further, improves the cycle performance of battery, increases the security performance of battery.
In addition, lithium iron phosphate dynamic battery chemical synthesizing method according to the present invention also has following additional technical feature:
In one embodiment of the invention, the Preset Time in described step S1 is 12 ~ 24 hours.
In one embodiment of the invention, the first predetermined current in described step S2 is 0.01 ~ 0.1C, and the second predetermined current in described step S3 is 0.05 ~ 0.2C, and the 3rd predetermined current in described step S4 is 0.05 ~ 0.1C.
In one embodiment of the invention, the default state-of-charge in described step S2 is 50% ~ 70%SOC, and the first predeterminated voltage in described step S2 is 2.3 ~ 2.5V.
In one embodiment of the invention, described second predeterminated voltage is greater than described 3rd predeterminated voltage.
Wherein, the second predeterminated voltage in described step S3 is 3.7 ~ 3.9V, and the 3rd predeterminated voltage in described step S4 is 3.6 ~ 3.65V.
In one embodiment of the invention, described preset times is arranged according to the degree of stability of the solid electrolyte interface film SEI film that described electrokinetic cell is formed.
In one embodiment of the invention, the cycle-index of described step S4 is 1 ~ 5 time.
The invention has the advantages that and can form stable fine and close SEI film, side reaction is occurred completely, effectively improve the cyclicity of battery, stability, self discharge and fail safe, and this chemical synthesizing method is simple to operate, reliability is high, be particularly useful for lithium iron phosphate battery for electric automobile, can be applicable.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the FB(flow block) of the lithium iron phosphate dynamic battery chemical synthesizing method according to the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, except as otherwise noted, the implication of " multiple " is two or more.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Below with reference to Fig. 1, the chemical synthesizing method according to the lithium iron phosphate dynamic battery of the embodiment of the present invention is described.
As shown in Figure 1, the chemical synthesizing method of the lithium iron phosphate dynamic battery that the embodiment of the present invention provides, comprises the steps:
Step S1, injects electrolyte to electrokinetic cell, and leaves standstill preset time t, electrolyte can be made thus fully to infiltrate, make the absorption of battery core to electrolyte more complete.
Step S2, extremely presets state-of-charge (i.e. SOC-stateofcharge) constant-current discharge to the first predeterminated voltage V1 afterwards with the first predetermined current I1 to the battery core constant current charge of electrokinetic cell.
Step S3, with the second predetermined current I2 to after battery core constant current charge to the second predeterminated voltage V2 of electrokinetic cell, constant-current discharge to the first predeterminated voltage V1.And after reaching the second predeterminated voltage constant-current discharge to the first predeterminated voltage, the second predetermined current is greater than the first predetermined current and the second predeterminated voltage is greater than the first predeterminated voltage.
Step S4, with the 3rd predetermined current I3 to after the battery core constant current charge of electrokinetic cell to the 3rd predeterminated voltage V3, constant-current discharge to the first predeterminated voltage V1, wherein the 3rd predetermined current I3 is greater than the first predetermined current I1 and the 3rd predeterminated voltage V3 is greater than the first predeterminated voltage V1.
Step S5, repeats step S4 preset times.
The chemical synthesizing method of lithium iron phosphate dynamic battery provided by the invention, leaves standstill after battery liquid-filling and electrolyte can be made fully to infiltrate, make the absorption of battery core to electrolyte more complete.Charge to default state-of-charge SOC with the first less predetermined current, the SEI film quality that low current charge is formed and state of interface better, can suppress the increase of SEI membrane impedance simultaneously, prevent the generation of Li dendrite to the restriction in charging interval.Then charge to the second predeterminated voltage with the second larger predetermined current, negative electrode active material can be made to be activated completely, and side reaction occurs completely, reduces the time changed into, and improves the active volume of battery.Finally charging to the 3rd predeterminated voltage with the 3rd predetermined current can make SEI film tend towards stability further, and thermal stability is better, and this step that circulates can stablize SEI film further, improves the cycle performance of battery, increases the security performance of battery.
In one embodiment of the invention, preset time t can be 12 ~ 24 hours.This step is that electrolyte is fully infiltrated, and makes the absorption of battery core to electrolyte more complete.Be understandable that, the above-mentioned setting to Preset Time is only for exemplary purposes, instead of in order to limit the present invention.Preset time t in of the present invention can also be set to other durations.
In one embodiment of the invention, the first predetermined current I1 can be 0.01 ~ 0.1C, and default state-of-charge SOC can be the 50% ~ 70%, first predeterminated voltage V1 can be 2.3 ~ 2.5V.With less first predetermined current charging be make the SEI film quality of formation and state of interface better, the increase of SEI membrane impedance can be suppressed simultaneously to the restriction in charging interval, prevent the generation of Li dendrite.It should be noted that, the above-mentioned setting to the first predetermined current I1 and default state-of-charge SOC is only for exemplary purposes, instead of in order to limit the present invention.The first predetermined current I1 in the present invention and default state-of-charge SOC can also be set to other numerical value.
In addition, be understandable that, the above-mentioned setting to lower voltage limit V1 is only for exemplary purposes, instead of in order to limit the present invention.The first predeterminated voltage V1 in of the present invention can also be set to other numerical value.
In one embodiment of the invention, the second predetermined current I2 can be 0.05 ~ 0.2C, and the second predeterminated voltage V2 can be 3.7 ~ 3.9V.Thus, charge to the second predeterminated voltage with the second larger predetermined current and negative electrode active material can be made to be activated completely, side reaction occurs completely, reduces the time changed into, and improves the active volume of battery.It will be appreciated, of course, that the above-mentioned setting to the second predetermined current I2 and the second predeterminated voltage V2 is only for exemplary purposes, instead of in order to limit the present invention.The second predetermined current I2 in the present invention and the second predeterminated voltage V2 can also be set to other numerical value.
In one embodiment of the invention, 3rd predetermined current I3 is slightly smaller than the second predetermined current I2, and the 3rd predeterminated voltage V3 is slightly smaller than the second predeterminated voltage V2, like this, SEI film can be made to tend towards stability further by the 3rd predetermined current I3 charging, thermal stability is better.Alternatively, the 3rd predetermined current I3 can be 0.05 ~ 0.1C, and the 3rd predeterminated voltage V3 can be 3.6 ~ 3.65V, and SEI film can be made to tend towards stability further with the 3rd predetermined current I3 charging, thermal stability is better.
Repeat step S4 and can stablize SEI film further, improve the cycle performance of battery, increase the security performance of battery.In concrete enforcement, the number of repetition of S4 step can be determined with reference to the degree of stability of SEI film, namely according to the degree of stability of the SEI film that electrokinetic cell is formed, preset times is set.
In of the present invention example, preset times is 1 ~ 5 time.Certainly, the present invention is not limited to this, and the 3rd predetermined current I3 in the present invention and the 3rd predeterminated voltage V3 can also be set to other numerical value.
In the chemical synthesizing method of the embodiment of the present invention, the second predeterminated voltage and the 3rd predeterminated voltage all can be understood as the upper voltage limit of lithium iron phosphate dynamic battery, and the first predeterminated voltage can be understood as lower voltage limit.
The invention has the advantages that and can form stable fine and close SEI film, side reaction is occurred completely, effectively improve the cyclicity of battery, stability, self discharge and fail safe, and this chemical synthesizing method is simple to operate, reliability is high, be particularly useful for lithium iron phosphate battery for electric automobile, can be applicable.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " illustrative examples ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (9)
1. a chemical synthesizing method for lithium iron phosphate dynamic battery, is characterized in that, comprises the following steps:
S1, injects electrolyte to electrokinetic cell, and leaves standstill Preset Time;
S2, to the battery core of described electrokinetic cell with the first predetermined current constant current charge to presetting state-of-charge, and after reaching described default state-of-charge constant-current discharge to the first predeterminated voltage;
S3, to the battery core of described electrokinetic cell with the second predetermined current constant current charge to the second predeterminated voltage, and after reaching described second predeterminated voltage constant-current discharge to the first predeterminated voltage, described second predetermined current is greater than described first predetermined current and described second predeterminated voltage is greater than described first predeterminated voltage;
S4, to the battery core of described electrokinetic cell with the 3rd predetermined current constant current charge to the 3rd predeterminated voltage, and after reaching described 3rd predeterminated voltage constant-current discharge to the first predeterminated voltage, 3rd predetermined current is greater than described first predetermined current and the 3rd predeterminated voltage is greater than described first predeterminated voltage, 3rd predetermined current I3 is less than the second predetermined current I2, and the 3rd predeterminated voltage V3 is less than the second predeterminated voltage V2; And
S5, repeated execution of steps S4 preset times.
2. chemical synthesizing method as claimed in claim 1, it is characterized in that, described Preset Time is 12 ~ 24 hours.
3. chemical synthesizing method as claimed in claim 1, it is characterized in that, described first predetermined current is 0.01 ~ 0.1C.
4. chemical synthesizing method as claimed in claim 1, it is characterized in that, described default state-of-charge is 50% ~ 70%SOC.
5. chemical synthesizing method as claimed in claim 1, it is characterized in that, described first predeterminated voltage is 2.3 ~ 2.5V.
6. chemical synthesizing method as claimed in claim 1, it is characterized in that, described second predetermined current is 0.05 ~ 0.2C, and described 3rd predetermined current is 0.05 ~ 0.1C.
7. chemical synthesizing method as claimed in claim 1, it is characterized in that, described second predeterminated voltage is 3.7 ~ 3.9V, and described 3rd predeterminated voltage is 3.6 ~ 3.65V.
8. chemical synthesizing method as claimed in claim 1, it is characterized in that, described preset times is arranged according to the degree of stability of the solid electrolyte interface film SEI film that described electrokinetic cell is formed.
9. chemical synthesizing method as claimed in claim 8, it is characterized in that, described preset times is 1 ~ 5 time.
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| CN104332670A (en) * | 2014-10-27 | 2015-02-04 | 山东圣阳电源股份有限公司 | Method for formation charging of lithium iron phosphate battery |
| CN106935912A (en) * | 2017-03-10 | 2017-07-07 | 江西佳沃新能源有限公司 | A kind of compound method for lithium ion battery |
| CN107464962B (en) * | 2017-08-03 | 2021-10-26 | 桑顿新能源科技(长沙)有限公司 | Activation method for gradient utilization power battery |
| CN107732314A (en) * | 2017-11-13 | 2018-02-23 | 桑顿新能源科技有限公司 | A kind of quick formation processing method for improving cycle performance of lithium ion battery |
| CN110400961A (en) * | 2018-04-25 | 2019-11-01 | 银隆新能源股份有限公司 | High temperature resistant type lithium ion battery and preparation method thereof |
| CN110323506B (en) * | 2019-07-11 | 2020-12-22 | 广州明美新能源股份有限公司 | Formation stabilizing method for lithium ion battery before storage |
| CN112271317B (en) * | 2020-09-11 | 2022-09-06 | 天津力神电池股份有限公司 | Method for regulating and controlling SOC (state of charge) of batch battery cells |
| CN113451673B (en) * | 2021-06-29 | 2023-01-31 | 惠州市赛能电池有限公司 | Formation method of lithium battery, lithium battery and preparation method thereof |
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