CN102769152A - Method for repairing lithium iron phosphate power battery material - Google Patents
Method for repairing lithium iron phosphate power battery material Download PDFInfo
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- CN102769152A CN102769152A CN2012102591581A CN201210259158A CN102769152A CN 102769152 A CN102769152 A CN 102769152A CN 2012102591581 A CN2012102591581 A CN 2012102591581A CN 201210259158 A CN201210259158 A CN 201210259158A CN 102769152 A CN102769152 A CN 102769152A
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Abstract
The invention provides a method for repairing a low-voltage lithium iron phosphate power battery material. The method includes the steps: 1) processing a lithium iron phosphate power battery with the charge-discharge multiplying power of 0.05-1C, the charge-discharge circulation of 1-5 times and the charge-discharge interval time of 5-60min; 2) storing the lithium iron phosphate power battery with the charge state of 50-100% for 1-10 days at the temperature of 25-100 DEG C, and then processing with the charge-discharge multiplying power of 0.2-1C, the charge-discharge circulation of 1-3 times and the charge-discharge interval time of 5-120min. The method for repairing a low-voltage lithium iron phosphate power battery material has the advantages that the low-voltage lithium iron phosphate power battery can be successively repaired by the method, stability of the repaired low-voltage lithium iron phosphate power battery is high after detection, and the method is high in operability, simple, practical, low in cost and beneficial to popularization and application.
Description
Technical field
The present invention relates to a kind of method of repairing the lithium iron phosphate dynamic battery material, a kind of processing method that can improve the reparation lithium iron phosphate dynamic battery material of stability especially is provided.
Background technology
At present, lithium iron phosphate dynamic battery since its have the thermal stability height, discharge and recharge the invertibity height, good cycle, material source are abundant, the advantage of reasonable price and non-environmental-pollution, be highly suitable in the electrokinetic cell Application for Field.Just at developing lithium iron phosphate dynamic battery, aspect battery material and electrolyte, people have carried out extensive and deep research.No doubt, the physical and chemical performance of material like composition, pattern, size, structure, surface state, conductance and compacted density etc., has great influence to the performance of battery.But after battery assembling was accomplished, it was improper to be provided with like parameter when the forming and capacity dividing, also can cause the instability of lithium iron phosphate dynamic battery chemical property.This unsteadiness mainly is to come from unsettled SEI film (solid electrolyte interface, solid electrolyte interface film), and this also is the main cause that causes battery low pressure.The low pressure problem of lithium iron phosphate dynamic battery is common.A-battery can be destroyed the consistency of battery pack, has reduced the life-span of battery pack greatly.Solve the low pressure problem of battery, can return the survey parameter, make battery form stable SEI film through appropriate discharging and recharging is set.
Research SEI film is a very challenging problem of tool.The stability of negative pole SEI film and battery charging and discharging cyclicity, invertibity, capacity retentivity all relevant (J. Phys. Chem. C, 2010,114,8076).In circulation and process of storing, the dissolving of SEI film is capacity main reasons for decrease (J. Power Sources, 2005,147,269; J. Electrochem. Soc., 2001,148, A1100), this does not mainly form stable SEI film owing to electrode surface as yet.For general positive electrode, it is all to electrolyte respond (J. Power Sources, 1999,95,81; J. Power Sources, 2000,89,206).When positive pole adopted fine particle such as nano material, unstable like the SEI film that forms, along with the growth in storage time, the adsorbed lithium-containing compound in surface increased gradually, and this can cause self discharge (J. Power Sources, 2010,195,7415; Adv. Mater. 2009,21, and 2703), show as the decline of open circuit voltage.The self-discharge phenomenon of lithium iron phosphate dynamic battery mainly is because battery surface does not form stable SEI film as yet.One of major reason that this unsettled SEI film produces is to discharge and recharge parameter improper (when the low pressure problem is with the composition of the defective of electrode material itself (coat like fault of construction and surface imperfect etc.), electrode material and when to mix degree relevant with moisture Control etc., then difficult make the battery acquisition stable through discharging and recharging to handle with certain environmental aging) is set.
Under the situation that nothing discharges and recharges, LiFePO4 is that surface film formed (J. Power Sources, 2010,195,7415) can or seldom not arranged with contacting of electrolyte.Under high temperature (greater than 40oC), if LiFePO
4The surface does not have stable diaphragm to cover (comprising that carbon coats and the SEI film coats), LiFePO
4Can be caused the unsteadiness of battery by non-aqueous solution electrolysis corrosion (Electrochem. Commun., 2005,7,669).And, this unsteadiness be difficult to through follow-up discharge and recharge to handle with certain environmental aging eliminate.Lithium iron phosphate dynamic battery carries out high-temperature storage under charged situation, for the LiFePO4 that has carbon to coat, the surface can form skin covering of the surface.And along with the prolongation of time, skin covering of the surface is stable gradually.For the LiFePO4 that does not have carbon to coat, the surface can form a large amount of boundary layers (J. Power Sources, 2010,195,7415), and is difficult to reach stable state.This can cause the instability of battery, and is difficult to make battery reach stability through follow-up forming and capacity dividing.Understand these influencing factors, for repair the low pressure lithium iron phosphate dynamic battery be arranged under the different temperatures with state-of-charge under ageing parameter foundation is provided.
Summary of the invention
In order to solve in the prior art; The shortcoming of lithium iron phosphate dynamic battery material low pressure, technical problem to be solved by this invention are to make the low pressure lithium iron phosphate dynamic battery obtain stability through lithium iron phosphate dynamic battery being discharged and recharged with the particular surroundings burin-in process.
To this, the present invention provides a kind of method of repairing low pressure lithium iron phosphate dynamic battery material, comprises following step:
1) the charge-discharge magnification of 0.05-1 C, blanking time that discharges and recharges of charge and discharge cycles, 5-60 minute of 1-5 time lithium iron phosphate dynamic battery is handled;
2) battery again with the state-of-charge of 50-100%, 25-100 ℃ store 1-10 days down after, handle with the charge-discharge magnification of 0.2-1 C, 1-3 time the interval that discharges and recharges of charge and discharge cycles, 5-120 minute.
Preferably, comprise following step:
1) be that 0.5 C charges 180 min to voltage 3.65 V with the low pressure lithium iron phosphate dynamic battery by charge-discharge magnification, constant voltage leaves standstill again;
2) lithium iron phosphate dynamic battery that steps A is obtained places under 45 ℃ of conditions and stores 2 days.
Preferably, the cut-off current in the said step 1 is 44 mA; Said low pressure lithium iron phosphate dynamic battery is not for there being the aging A-battery of full electric high temperature (45 ℃).
Preferably, comprise following step:
1) be that 0.2 C charges 180 min to voltage 3.65 V with the low pressure lithium iron phosphate dynamic battery by charge-discharge magnification, constant voltage leaves standstill 10 min again;
2) be that 0.5 C discharges 180 min to voltage 2.0 V with the low pressure lithium iron phosphate dynamic battery after step 1 processing by charge-discharge magnification; Leave standstill 10 min;
3) be that 0.5 C charges 180 min to voltage 3.65 V with the low pressure lithium iron phosphate dynamic battery after step 2 processing by charge-discharge magnification; Leave standstill 10 min;
4) be that 1 C discharges 90 min to voltage 2.0 V with the low pressure lithium iron phosphate dynamic battery after step 3 processing by charge-discharge magnification; Leave standstill 10 min;
5) be that 0.5 C charges 180 min to voltage 3.65 V with the low pressure lithium iron phosphate dynamic battery after step 4 processing by charge-discharge magnification; Leave standstill 10 min;
6) be that 1 C discharges 90 min to voltage 2.0 V with the low pressure lithium iron phosphate dynamic battery after step 5 processing by charge-discharge magnification; Leave standstill 10min;
7) be that 0.5 C charges 180 min to voltage 3.65 V with the low pressure lithium iron phosphate dynamic battery after step 6 processing by charge-discharge magnification;
8) lithium iron phosphate dynamic battery that step 7 is obtained places under 45 ℃ of conditions and stores 7 days.
Preferably, wherein lithium iron phosphate dynamic battery is for having the A-battery of full electric high temperature (45 ℃) burin-in process.
Preferably, comprise following step:
1) the low pressure lithium iron phosphate dynamic battery is pressed 55 mA constant current charges, 10 h to voltage 3.65 V, leave standstill 10 min;
2) the low pressure lithium iron phosphate dynamic battery after step 1 processing is pressed 220 mA constant-current discharges, 180 min to voltage 2.0 V; Leave standstill 10 min;
3) the low pressure lithium iron phosphate dynamic battery after step 2 processing is pressed 55 mA constant current charges, 10 h to voltage 3.65 V, constant voltage leaves standstill 10 min;
4) the low pressure lithium iron phosphate dynamic battery after step 3 processing is pressed 220 mA constant-current discharge to 2.0 V, constant voltage leaves standstill 10 min;
5) the low pressure lithium iron phosphate dynamic battery after step 4 processing is pressed 550 mA constant-current constant-voltage chargings, 180 min to voltage 3.65 V, cut-off current 55 mA;
6) lithium iron phosphate dynamic battery that step 5 is obtained places 60 ℃ to store 4 days down.
Preferably, the voltage of said low pressure lithium iron phosphate dynamic battery is 0.5 to 2.52 V.
Battery of the present invention is after repairing; Under the 45oC hot environment, shelve 4 d (self discharge test; Be the stability test of battery); Battery open circuit voltage is no more than the wherein a certain numerical value of 0.01-0.10 V when the high temperature test every day greater than the variation of 2.52 V and its open circuit voltage, is regarded as A-battery reparation success.
The A-battery that this patent is related; It is the burin-in process that does not have through the full electric high temperature 40-80oC that shelves and be longer than 4 d of the high temperature 40-80oC that is longer than 12 h before changing into; Do not have destructive test through other yet, as overcharge, cross put, extruding, short circuit, acupuncture etc.
The invention has the beneficial effects as follows: the method that is provided among the present invention can successfully be repaired the low pressure lithium iron phosphate dynamic battery; And the lithium iron phosphate dynamic battery after repairing is after detecting; Battery performance good stable property; And workable, simple and practical, with low cost, help applying.
Description of drawings
Fig. 1 is the charge/discharge capacity and the coulombic efficiency figure (A-battery voltage is the situation of 0.53 V) of the A-battery of Comparative Examples 3 of the present invention.
Fig. 2 is the charge/discharge capacity and the coulombic efficiency figure (A-battery voltage is the situation of 1.08 V) of the A-battery of Comparative Examples 3 of the present invention.
Embodiment
Below in conjunction with embodiment the present invention is further specified.
The manufacture craft of lithium iron phosphate dynamic battery at first need be described:
(1), the coating of positive pole: with mass ratio is lithium iron phosphate positive material (surface has carbon to coat), acetylene black, polyvinylidene fluoride (PVDF) and methyl pyrrolidone (NMP) (solid content is 48%) mixing, the stirring of 96:1:3; Equably be coated in aluminium foil on the coating machine slurry then; Then to pole piece toast, roll-in, cut-parts, obtain anode pole piece;
(2), the coating of negative pole: with weight ratio is Delanium, carbon black, graphite agent (KS-6), PVDF and NMP (solid content is 50%) mixing, the stirring of 91.5:1.5:1.5:5.5; Then slurry is being evenly coated on the coating machine on the Copper Foil; Then to pole piece toast, roll-in, cut-parts, obtain cathode pole piece;
(3), with above two the step gained both positive and negative polarity pole piece combo, coiling, encapsulation, obtain electric core;
(4), to battery liquid-filling and potting.The electrolyte that adopts is: ethylene carbonate, dimethyl carbonate, propene carbonate, 1, and the mixed solution of the inferior vinyl carbonate of 2-(weight ratio is 40:40:15:5) wherein contains the electrolyte lithium hexafluoro phosphate of 1.5 mol/L;
(5), new battery is carried out the preliminary filling chemical synthesis technology;
(6), all kinds of A-batteries that obtained are carried out the various survey technologies of returning that this patent proposed.
The related lithium iron phosphate dynamic battery of this patent is cylindrical 18650 size battery, and normal capacity is 1100 mAh.As long as adopt the electrode material of similarity to carry out the battery assembling, the battery material in the present patent application also is applicable to the battery of other model.
Embodiment 1
A kind of method of repairing the low pressure lithium iron phosphate dynamic battery discharges and recharges parameter through optimization and makes lithium iron phosphate dynamic battery show stability with the burin-in process of carrying out under certain environment.Low pressure (being lower than 2.52 V) lithium iron phosphate dynamic battery carry out following have a full electric high temperature ageing step return survey (return survey technology 1),
(1), 0.5 C constant-current constant-voltage charging, 180 min, upper voltage limit 3.65 V, cut-off current 44 mA;
(2), high temperature stores 2 days for 45 ℃;
(3), 1 C constant-current discharge, 90 min, lower voltage limit 2.0 V; Leave standstill 10 min;
(4), 0.2 C constant-current discharge, 20 min, lower voltage limit 2.0 V;
(5), 45 ℃ of high-temperature storage 4 days (survey voltage before and after the high temperature, the result sees table 1).
More than (1) and (2) work step for repairing step, (3)～(5) work step is the stability test testing procedure.
Table 1. pair A-battery is returned the steadiness of surveying after technology 1 is repaired.
Table 1 can know not have the aging A-battery of full electric high temperature (45 ℃), and after returning survey, voltage obtains, battery performance stability, battery reparation success; For the A-battery that full electric high temperature ageing 2-4 d is arranged, after returning survey, voltage does not obviously promote, and shows that battery is unstable, repairs unsuccessful.Because the A-battery that present patent application is related is not have to shelve the full electric high temperature ageing of handling and not having process not to be longer than 4 d through the high temperature of being longer than 12 h before changing into to handle, promptly the destructiveness of the surface state of electrode is not expendable.So repairing unsuccessful main cause is that in the process of full electric high temperature ageing, the SEI film can not get stable fully (promptly the full electric high temperature ageing time is shorter) (this has the support of previous technique background), thereby causes self discharge, voltage decline.Can solve through returning to survey by this former thereby low pressure problem that produce.
?
For have full electric high temperature ageing handle (ageing time is no more than 4 d) and the low pressure lithium iron phosphate dynamic battery, carry out following have charge and discharge cycles and a long-time full electric high temperature ageing return surveys (returning survey technology 2),
(1), 0.2 C constant-current constant-voltage charging, 420 min, upper voltage limit 3.65 V; Leave standstill 10 min;
(2), 0.5 C constant-current discharge, 180 min, lower voltage limit 2.0 V; Leave standstill 10 min;
(3), 0.5 C constant-current constant-voltage charging, 180 min, upper voltage limit 3.65 V; Leave standstill 10 min;
(4), 1 C constant-current discharge, 90 min, lower voltage limit 2.0 V; Leave standstill 10 min;
(5), 0.5 C constant-current constant-voltage charging, 180 min, upper voltage limit 3.65 V; Leave standstill 10 min;
(6), 1 C constant-current discharge, 90 min, lower voltage limit 2.0 V; Leave standstill 10 min;
(7), 0.5 C constant-current constant-voltage charging, 180 min, upper voltage limit 3.65 V;
(8), the 45oC high-temperature storage is 7 days;
(9), 0.2 C constant-current discharge, 60 min; Leave standstill 5 min; 0.5 C constant-current discharge 30 min; Leave standstill 5 min; 1 C constant-current discharge, 70 min, lower voltage limit 2.0 V; Leave standstill 10 min;
(10), 0.2 C constant-current discharge, 20 min, lower voltage limit 2.0 V;
(11), 45 ℃ of high-temperature storage 4 days (survey voltage before and after the high temperature, the result sees table 2).
Table 2. adopts the situation that 2 pairs of A-batteries of technology are returned survey of surveying of returning.
Shown in the table 2, return and have the A-battery that full electric high temperature ageing is handled before the survey, after returning survey, voltage obtains basically, and battery performance stability is repaired successfully.This has verified having on the basis of charge and discharge cycles, and A-battery is carried out enough for a long time full electric high temperature ageing, can make electrode surface form stable SEI film, suppresses self discharge, and cell voltage is high.But, the minority battery is still arranged, behind for a long time full electric high temperature ageing, its voltage still is on the low side.This situation mainly is destroyed owing to the surface state of electrode, like Fe
2+Dissolving.This can cause the unsteadiness of SEI film at high temperature to be aggravated, and further destroys the surface state of electrode, causes the self-discharge phenomenon that can not repair.For fear of the generation of this situation, key is when new battery being discharged and recharged processing, and the appropriate parameter that discharges and recharges just need be set.
Embodiment 3
Adopt below have 60 ℃ of burin-in process of full electric high temperature and a charge and discharge cycles return survey technology 3, A-battery is repaired,
(1), 55 mA constant-current constant-voltage chargings, 10 h, upper voltage limit 3.65 V; Leave standstill 10 min;
(2), 220 mA constant-current discharge to 2.0 V; Leave standstill 10 min;
(3), 55 mA constant-current constant-voltage chargings, 10 h, upper voltage limit 3.65 V; Leave standstill 10 min;
(4), 220 mA constant-current discharge to 2.0 V; Leave standstill 10 min;
(5), 550 mA constant-current constant-voltage chargings, 180 min, upper voltage limit 3.65 V, cut-off current 55 mA;
(6), high temperature stores 4 days for 60 ℃;
(7), supreme the rationing the power supply of 550 mA constant-current constant-voltage chargings pressed 3.65 V, cut-off current 55 mA; Leave standstill 10 min;
(8), 220 mA constant-current discharges, 60 min, change 550 mA constant-current discharges, 30 min, change 1100 mA constant-current discharges, 70 min again, lower voltage limit 2.0 V; Leave standstill 10 min;
(9), 220 mA constant-current discharges, 20 min, lower voltage limit 2.0 V;
(10), 45 ℃ of high-temperature storage 4 days (survey voltage before and after the high temperature, the result sees table 3).
The situation that 3 pairs of A-batteries of technology are repaired of surveying is returned in table 3. utilization.
As shown in table 3, no matter be the A-battery of not having or have full electric high temperature ageing, after returning survey, cell voltage can obtain basically, and battery obtains stability.But similar with embodiment 2, still there is the reparation of minority battery unsuccessful.The unsteadiness of this type of battery should mainly arise from the electrode surface state and before reparation, be destroyed already, and perhaps the surface state of electrode is originally with regard to defectiveness (imperfect like electrode material fault of construction and surperficial coated with conductive agent).This type of battery be difficult to through follow-up discharge and recharge to handle with certain environmental aging reach stability.
What need propose in addition a bit is, adopts the fierce renovation technique of these 60 ℃ of high temperature ageings, is aimed at mainly that those batteries that are difficult to repair implement, and under unavoidable situation, just adopts.Because, in technical background, mention, if the surface state of electrode is unstable as yet, at high temperature, and the battery of the full electricity of band, electrode surface can form a large amount of surface adsorption things, produces thick SEI film, consumes a large amount of Li
+, cause capacity decline, internal resistance to be increased.
Embodiment 4 (Comparative Examples 1)
Getting does not have to shelve and expire the A-battery of electric high temperature ageing processing through being longer than 12 h high temperature before changing into, and carries out the following survey (return and survey technology 4) of returning,
(1), 0.5 C constant-current constant-voltage charging, 180 min, upper voltage limit 3.65 V, cut-off current 44 mA;
(2), leave standstill 10 min;
(3), 1.0 C constant-current discharges, 90 min, lower voltage limit 2.0 V; Leave standstill 10 min;
(4), 0.2 C constant-current discharge, 20 min, lower voltage limit 2.0 V;
(5), 45 ℃ of high-temperature storage 4 days (survey voltage before and after the high temperature, the result sees table 4).
As shown in table 4, for this type of A-battery, after once returning survey, stability improves undesirable.Can know from top embodiment, for the A-battery that has full electric high temperature ageing to handle, be to repair than the A-battery that does not have this processing is more difficult.Therefore, above technology is for repairing the A-battery that those have full electric high temperature ageing to handle, and it is more undesirable repairing the result.
The situation of change of table 4. A-battery voltage after returning survey
Embodiment 5 (Comparative Examples 2)
Be to contrast the once situation of returning survey technology 5 of charge and discharge cycles below,
(1), 0.5 C constant-current constant-voltage charging, 180 min, upper voltage limit 3.65 V, cut-off current 44 mA;
(2), leave standstill 10 min;
(3), 1.0 C constant-current discharges, 90 min, lower voltage limit 2.0 V; Leave standstill 10 min;
(4), above (1)～(3) step circulation primary;
(5), 0.2 C constant-current discharge, 20 min, lower voltage limit 2.0 V;
(6), 45 ℃ of high-temperature storage 4 days (survey voltage before and after the high temperature, the result sees table 5).
Table 5. is the situation of survey technology to the A-battery reparation of returning of charge and discharge cycles once.
As shown in table 5, the result is undesirable in reparation.
Embodiment 6 (Comparative Examples 3)
Carry out repeatedly loop test (return and survey technology 6) in the face of the A-battery of not handling down through overfill electricity high temperature ageing.The technological parameter that is provided with is following:
(1), 0.5 C constant-current constant-voltage charging, 180 min, upper voltage limit 3.65 V, cut-off current 44 mA;
(2), leave standstill 10 min;
(3), 1.0 C constant-current discharges, 90 min, lower voltage limit 2.0 V;
(4), leave standstill 90 min;
(5), with cocycle 10 times (charge/discharge capacity and coulombic efficiency situation are seen Fig. 1 and Fig. 2);
(6), 0.2 C constant-current discharge, 20 min, lower voltage limit 2.0 V;
(7), 45 ℃ high-temperature storage 4 days (survey voltage before and after the high temperature, the result sees table 6).
As shown in table 6, adopt have repeatedly a charge and discharge cycles return survey technology, the reparation of A-battery is had certain effect.This explanation, repeatedly circulation helps forming stable SEI film.This can explain from the size of coulombic efficiency.In the charge and discharge cycles capacity and coulombic efficiency figure of A-battery (Fig. 1 and Fig. 2), when discharging and recharging for the first time, coulombic efficiency is lower, and the loss of capacity mainly is the formation (Adv. Mater., 2008,20,2878) of SEI; A-battery is after discharging and recharging for the second time, and coulombic efficiency reaches 100% basically, explains that the SEI film is stable gradually.This and consistent (Chem. Mater., 2009,21,2895) of bibliographical information.
The steadiness of table 6. A-battery after 10 charge and discharge cycles are handled.
Repeatedly circulation no doubt can constantly be stablized the SEI film, and still, this stability is not necessarily permanent, like the situation of table 6.Yet, on the basis of this stability, battery is carried out full electric high temperature ageing handle, can make battery obtain permanent stablizing.
Know from the above result that A-battery is returned survey, do not handle, can preferably return and survey technology 1 through overfill electricity high temperature ageing like A-battery; Have through the processing of overfill electricity high temperature ageing like A-battery, can preferably return and survey technology 2; For the A-battery that is difficult to repair, can adopt to return and survey technology 3.
Above content is to combine concrete preferred implementation to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.
Claims (9)
1. a method of repairing low pressure lithium iron phosphate dynamic battery material is characterized in that, comprises following step:
1) the charge-discharge magnification of 0.05-1 C, blanking time that discharges and recharges of charge and discharge cycles, 5-60 minute of 1-5 time lithium iron phosphate dynamic battery is handled;
2) lithium iron phosphate dynamic battery again with the state-of-charge of 50-100%, 25-100 ℃ store 1-10 days down after, handle with the charge-discharge magnification of 0.2-1 C, 1-3 time the interval that discharges and recharges of charge and discharge cycles, 5-120 minute.
2. a method of repairing low pressure lithium iron phosphate dynamic battery material is characterized in that, comprises following step:
1) be that 0.5 C charges 180 min to voltage 3.65 V with the low pressure lithium iron phosphate dynamic battery by charge-discharge magnification, constant voltage leaves standstill again;
2) lithium iron phosphate dynamic battery that steps A is obtained places under 45 ℃ of conditions and stores 2 days.
3. a method of repairing low pressure lithium iron phosphate dynamic battery material is characterized in that, comprises following step:
1) be that 0.2 C charges 180 min to voltage 3.65 V with the low pressure lithium iron phosphate dynamic battery by charge-discharge magnification, constant voltage leaves standstill 10 min again;
2) be that 0.5 C discharges 180 min to voltage 2.0 V with the low pressure lithium iron phosphate dynamic battery after step 1 processing by charge-discharge magnification; Leave standstill 10 min;
3) be that 0.5 C charges 180 min to voltage 3.65 V with the low pressure lithium iron phosphate dynamic battery after step 2 processing by charge-discharge magnification; Leave standstill 10 min;
4) be that 1 C discharges 90 min to voltage 2.0 V with the low pressure lithium iron phosphate dynamic battery after step 3 processing by charge-discharge magnification; Leave standstill 10 min;
5) be that 0.5 C charges 180 min to voltage 3.65 V with the low pressure lithium iron phosphate dynamic battery after step 4 processing by charge-discharge magnification; Leave standstill 10 min;
6) be that 1 C discharges 90 min to voltage 2.0 V with the low pressure lithium iron phosphate dynamic battery after step 5 processing by charge-discharge magnification; Leave standstill 10 min;
7) be that 0.5 C charges 180 min to voltage 3.65 V with the low pressure lithium iron phosphate dynamic battery after step 6 processing by charge-discharge magnification;
8) lithium iron phosphate dynamic battery that step 7 is obtained places under 45 ℃ of conditions and stores 7 days.
4. a method of repairing low pressure lithium iron phosphate dynamic battery material is characterized in that, comprises following step: step:
1) the low pressure lithium iron phosphate dynamic battery is pressed 55 mA constant current charges, 10 h to voltage 3.65 V, leave standstill 10 min;
2) the low pressure lithium iron phosphate dynamic battery after step 1 processing is pressed 220 mA constant-current discharges, 180 min to voltage 2.0 V; Leave standstill 10 min;
3) the low pressure lithium iron phosphate dynamic battery after step 2 processing is pressed 55 mA constant current charges, 10 h to voltage 3.65 V, constant voltage leaves standstill 10 min;
4) the low pressure lithium iron phosphate dynamic battery after step 3 processing is pressed 220 mA constant-current discharge to 2.0 V, constant voltage leaves standstill 10 min;
5) the low pressure lithium iron phosphate dynamic battery after step 4 processing is pressed 550 mA constant-current constant-voltage chargings, 180 min to voltage 3.65 V, cut-off current 55 mA;
6) lithium iron phosphate dynamic battery that step 5 is obtained places 60 ℃ to store 4 days down.
5. like the method for the said reparation low pressure of claim 2 lithium iron phosphate dynamic battery material, it is characterized in that the cut-off current in the said step 1 is 44 mA.
6. like the method for claim 2 or 5 said reparation low pressure lithium iron phosphate dynamic battery materials, it is characterized in that said low pressure lithium iron phosphate dynamic battery is not for there being the A-battery of full electric high temperature ageing.
7. like the method for the said reparation low pressure of claim 3 lithium iron phosphate dynamic battery material, it is characterized in that said low pressure lithium iron phosphate dynamic battery is to have the A-battery that full electric high temperature ageing is handled.
8. like the method for claim 6 or 7 said reparation low pressure lithium iron phosphate dynamic battery materials, it is characterized in that said temperature is 45 ℃.
9. the method like each described reparation low pressure lithium iron phosphate dynamic battery material of claim 1 to 8 is characterized in that, the voltage of said low pressure lithium iron phosphate dynamic battery is 0.5 to 2.52 V.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107464962A (en) * | 2017-08-03 | 2017-12-12 | 桑顿新能源科技有限公司 | A kind of echelon utilizes electrokinetic cell Activiation method |
| CN107860810A (en) * | 2017-10-20 | 2018-03-30 | 合肥国轩高科动力能源有限公司 | Electrochemical method and system for representing SEI film forming and decomposing processes |
| CN110021793A (en) * | 2018-01-09 | 2019-07-16 | 深圳市普兰德储能技术有限公司 | A method of repairing retired performance of lithium ion battery |
| CN112793466A (en) * | 2021-03-24 | 2021-05-14 | 辽宁工业大学 | Control method of new energy automobile battery management system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107464962A (en) * | 2017-08-03 | 2017-12-12 | 桑顿新能源科技有限公司 | A kind of echelon utilizes electrokinetic cell Activiation method |
| 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 |
| CN107860810A (en) * | 2017-10-20 | 2018-03-30 | 合肥国轩高科动力能源有限公司 | Electrochemical method and system for representing SEI film forming and decomposing processes |
| CN107860810B (en) * | 2017-10-20 | 2021-01-29 | 合肥国轩高科动力能源有限公司 | Electrochemical method and system for representing SEI film forming and decomposing processes |
| CN110021793A (en) * | 2018-01-09 | 2019-07-16 | 深圳市普兰德储能技术有限公司 | A method of repairing retired performance of lithium ion battery |
| CN112793466A (en) * | 2021-03-24 | 2021-05-14 | 辽宁工业大学 | Control method of new energy automobile battery management system |
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| CN102769152B (en) | 2014-10-22 |
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