CN102769152B - 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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- CN102769152B CN102769152B CN201210259158.1A CN201210259158A CN102769152B CN 102769152 B CN102769152 B CN 102769152B CN 201210259158 A CN201210259158 A CN 201210259158A CN 102769152 B CN102769152 B CN 102769152B
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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 lithium iron phosphate dynamic battery material, a kind of processing method of the reparation lithium iron phosphate dynamic battery material that can improve stability is especially provided.
Background technology
At present, lithium iron phosphate dynamic battery because it has advantages of that thermal stability is high, discharges and recharges that invertibity is high, abundant, the reasonable price of good cycle, material source and non-environmental-pollution, be highly suitable for the application in electrokinetic cell 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, as composition, pattern, size, structure, surface state, conductance and compacted density etc., has great impact to the performance of battery.But, after battery pack installs into, as parameter when the forming and capacity dividing arranges improperly, also can cause the unstable of lithium iron phosphate dynamic battery chemical property.This unsteadiness is mainly to come from unsettled SEI film (solid electrolyte interface, solid electrolyte interface film), and this is also 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 greatly reduced the life-span of battery pack.Solve the low pressure problem of battery, can return survey parameter by appropriate discharging and recharging is set, make battery form stable SEI film.
Research SEI film is a very challenging problem of tool.The stability of negative pole SEI film and battery charging and discharging cyclicity, invertibity, Capacitance reserve be relevant (J. Phys. Chem. C, 2010,114,8076) all.In the process of circulation and storage, the dissolving of SEI film is the main cause of capacity loss (J. Power Sources, 2005,147,269; J. Electrochem. Soc., 2001,148, A1100), this mainly not yet forms stable SEI film owing to electrode surface.For general positive electrode, it is all to electrolyte respond (J. Power Sources, 1999,95,81; J. Power Sources, 2000,89,206).In the time that positive pole adopts fine particle as nano material, as unstable in the SEI film forming, along with the growth in storage time, the lithium-containing compound that adsorb on surface increases gradually, and this can cause self discharge (J. Power Sources, 2010,195,7415; Adv. Mater. 2009,21,2703), show as the decline of open circuit voltage.The self-discharge phenomenon of lithium iron phosphate dynamic battery is mainly because battery surface not yet forms stable SEI film.One of major reason that this unsettled SEI film produces be discharge and recharge parameter arrange improper (when low pressure problem be with the defect of electrode material itself (as fault of construction and surface coated imperfect etc.), composition and mixing uniformity and the moisture control etc. of electrode material is when relevant, more difficultly makes battery acquisition stability by discharging and recharging with certain environmental aging processing).
In the situation that nothing discharges and recharges, LiFePO4 is can or seldom not have surface film formed (J. Power Sources, 2010,195,7415) with contacting of electrolyte.Under high temperature (being greater than 40oC), if LiFePO
4surface does not have stable diaphragm to cover (comprising that carbon is coated and SEI film is coated), LiFePO
4can, by non-aqueous solution electrolysis corrosion (Electrochem. Commun., 2005,7,669), cause the unsteadiness of battery.And this unsteadiness is to be difficult to eliminate by follow-up discharging and recharging with certain environmental aging processing.Lithium iron phosphate dynamic battery carries out high-temperature storage charged in the situation that, and for there being the coated LiFePO4 of carbon, surface can form skin covering of the surface.And along with the prolongation of time, skin covering of the surface is stable gradually.For there is no the coated LiFePO4 of carbon, 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 unstable of battery, and is difficult to make battery reach stability by follow-up forming and capacity dividing.Understand these influencing factors, for repair low pressure lithium iron phosphate dynamic battery be arranged under different temperatures and state-of-charge under ageing parameter foundation is provided.
Summary of the invention
In order to solve in prior art, the shortcoming of lithium iron phosphate dynamic battery material low pressure, technical problem to be solved by this invention is to make low pressure lithium iron phosphate dynamic battery obtain stability by lithium iron phosphate dynamic battery being discharged and recharged with particular surroundings burin-in process.
To this, the invention provides a kind of method of repairing low pressure lithium iron phosphate dynamic battery material, comprise following step:
1) the charge-discharge magnification of 0.05-1 C, interval time that discharges and recharges of charge and discharge cycles, 5-60 minute of 1-5 time lithium iron phosphate dynamic battery is processed;
2) battery again with the state-of-charge of 50-100%, at 25-100 DEG C, store after 1-10 days, process with the charge-discharge magnification of 0.2-1 C, the interval that discharges and recharges of charge and discharge cycles, 5-120 minute of 1-3 time.
Preferably, comprise following step:
1) be that 0.5 C charges 180 min to voltage 3.65 V by low pressure lithium iron phosphate dynamic battery by charge-discharge magnification, then constant voltage leave standstill;
2) lithium iron phosphate dynamic battery steps A being obtained is placed under 45 DEG C of conditions and stores 2 days.
Preferably, the cut-off current in described step 1 is 44 mA; Described low pressure lithium iron phosphate dynamic battery is without the full aging A-battery of electric high temperature (45 DEG C).
Preferably, comprise following step:
1) be that 0.2 C charges 180 min to voltage 3.65 V by low pressure lithium iron phosphate dynamic battery by charge-discharge magnification, then constant voltage leave standstill 10 min;
2) be that 0.5 C discharges 180 min to voltage 2.0 V by low pressure lithium iron phosphate dynamic battery after treatment step 1 by charge-discharge magnification; Leave standstill 10 min;
3) be that 0.5 C charges 180 min to voltage 3.65 V by low pressure lithium iron phosphate dynamic battery after treatment step 2 by charge-discharge magnification; Leave standstill 10 min;
4) be that 1 C discharges 90 min to voltage 2.0 V by low pressure lithium iron phosphate dynamic battery after treatment step 3 by charge-discharge magnification; Leave standstill 10 min;
5) be that 0.5 C charges 180 min to voltage 3.65 V by low pressure lithium iron phosphate dynamic battery after treatment step 4 by charge-discharge magnification; Leave standstill 10 min;
6) be that 1 C discharges 90 min to voltage 2.0 V by low pressure lithium iron phosphate dynamic battery after treatment step 5 by charge-discharge magnification; Leave standstill 10min;
7) be that 0.5 C charges 180 min to voltage 3.65 V by low pressure lithium iron phosphate dynamic battery after treatment step 6 by charge-discharge magnification;
8) lithium iron phosphate dynamic battery step 7 being obtained is placed under 45 DEG C of conditions and stores 7 days.
Preferably, lithium iron phosphate dynamic battery is wherein for having the A-battery of full electric high temperature (45 DEG C) burin-in process.
Preferably, comprise following step:
1) low pressure lithium iron phosphate dynamic battery is pressed to 55 mA constant current charge 10 h to voltage 3.65 V, leave standstill 10 min;
2) low pressure lithium iron phosphate dynamic battery after treatment step 1 is pressed to 220 mA constant-current discharge 180 min to voltage 2.0 V; Leave standstill 10 min;
3) low pressure lithium iron phosphate dynamic battery after treatment step 2 is pressed to 55 mA constant current charge 10 h to voltage 3.65 V, constant voltage leaves standstill 10 min;
4) low pressure lithium iron phosphate dynamic battery after treatment step 3 is pressed to 220 mA constant-current discharge to 2.0 V, constant voltage leaves standstill 10 min;
5) low pressure lithium iron phosphate dynamic battery after treatment step 4 is pressed to 550 mA constant-current constant-voltage charging 180 min to voltage 3.65 V, cut-off current 55 mA;
6) lithium iron phosphate dynamic battery step 5 being obtained is placed at 60 DEG C and stores 4 days.
Preferably, the voltage of described low pressure lithium iron phosphate dynamic battery is 0.5 to 2.52 V.
Battery of the present invention is after repairing, under 45oC hot environment, shelve 4 d(self discharge tests, be the stability test of battery), battery open circuit voltage is greater than 2.52 V, the wherein a certain numerical value that is no more than 0.01-0.10 V with the variation of its open circuit voltage when the high temperature test every day, is considered as A-battery reparation success.
The A-battery that this patent is related, it is the burin-in process not having through being longer than the full electric high temperature 40-80oC that shelves and be longer than 4 d of the high temperature 40-80oC of 12 h before changing into, also there is destructive test through other, as overcharge, cross put, extruding, short circuit, acupuncture etc.
The invention has the beneficial effects as follows: the method providing in the present invention can successfully be repaired low pressure lithium iron phosphate dynamic battery, and through repair after lithium iron phosphate dynamic battery after testing after, battery shows good stability, and workable, simple and practical, with low cost, be conducive to apply.
Brief description of the drawings
Fig. 1 is charge/discharge capacity and the coulombic efficiency figure (A-battery voltage is the situation of 0.53 V) of the A-battery of comparative example 3 of the present invention.
Fig. 2 is charge/discharge capacity and the coulombic efficiency figure (A-battery voltage is the situation of 1.08 V) of the A-battery of comparative example 3 of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
First need to illustrate the manufacture craft of lithium iron phosphate dynamic battery:
(1), anodal coating: the lithium iron phosphate positive material that is 96:1:3 by mass ratio (surface has carbon to be coated), acetylene black, polyvinylidene fluoride (PVDF) and methyl pyrrolidone (NMP) (solid content is 48%) mix, stir, then slurry is coated in equably on aluminium foil on coating machine, then to pole piece toast, roll-in, cut-parts, obtain anode pole piece;
(2), the coating of negative pole: the Delanium that is 91.5:1.5:1.5:5.5 by weight ratio, carbon black, graphite agent (KS-6), PVDF and NMP(solid content are 50%) mix, stir, then slurry is evenly coated on Copper Foil on coating machine, then to pole piece toast, roll-in, cut-parts, obtain cathode pole piece;
(3), by both positive and negative polarity pole piece combo, coiling, the encapsulation of above two step gained, obtain battery core;
(4), to battery liquid-filling potting.The electrolyte adopting is: ethylene carbonate, dimethyl carbonate, propene carbonate, 1, and the mixed solution of the sub-vinyl carbonate of 2-(weight ratio is 40:40:15:5), wherein containing the electrolyte lithium hexafluoro phosphate of 1.5 mol/L;
(5), new battery is carried out to preliminary filling chemical synthesis technology;
(6), obtained all kinds of A-batteries are carried out to the various survey techniques of returning that this patent proposes.
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 battery assembling, the battery material in present patent application is also applicable to the battery of other model.
embodiment 1
Repair a method for low pressure lithium iron phosphate dynamic battery, discharge and recharge parameter by optimization and make lithium iron phosphate dynamic battery show stability with the burin-in process of carrying out under certain environment.Low pressure (lower than 2.52 V) lithium iron phosphate dynamic battery carry out following there is full electric high temperature ageing step return survey (return survey technique 1),
(1), 0.5 C constant-current constant-voltage charging 180 min, upper voltage limit 3.65 V, cut-off current 44 mA;
(2), 45 DEG C of storages of high temperature 2 days;
(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 DEG C of high-temperature storage 4 days (survey voltage before and after high temperature, the results are shown in Table 1).
(1) and (2) work step is for repairing step above, and (3)～(5) work step is stability test testing procedure.
Table 1. returns the steadiness of surveying after technique 1 is repaired to A-battery.
Table 1 is known, and without the full aging A-battery of electric high temperature (45 DEG C), after returning survey, voltage is gone up, battery performance stability, battery reparation success; For the A-battery that has full electric high temperature ageing 2-4 d, 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 the high temperature through being longer than 12 h before changing into shelve processing and there is no the full electric high temperature ageing processing through not being longer than 4 d, 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, SEI film can not get stable (the full electric high temperature ageing time is shorter) (this has the support of previous technique background) fully, thereby causes self discharge, voltage drop.Can be solved by returning to survey by this low pressure problem former thereby that produce.
?
embodiment 2
For have full electric high temperature ageing processing (ageing time be no more than 4 d) and low pressure lithium iron phosphate dynamic battery, carry out following there is charge and discharge cycles and long-time full electric high temperature ageing return surveys (returning survey technique 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), 45oC high-temperature storage 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 DEG C of high-temperature storage 4 days (survey voltage before and after high temperature, the results are shown in Table 2).
Table 2. adopts to return and surveys technique 2 and A-battery is returned to the situation of survey.
Shown in table 2, return the A-battery before survey with full electric high temperature ageing processing, after returning survey, voltage is gone up substantially, and battery performance stability, repairs successfully.This has verified, on the basis that has charge and discharge cycles, A-battery is carried out to enough for a long time full electric high temperature ageings, can make electrode surface form stable SEI film, suppresses self discharge, and cell voltage is high.But, still there is minority battery, after for a long time full electric high temperature ageing, its voltage or on the low side.This situation is mainly destroyed owing to the surface state of electrode, as 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 of unrepairable.For fear of the generation of this situation, key is in the time new battery being discharged and recharged to processing, and the appropriate parameter that discharges and recharges just need to be set.
embodiment 3
Employing below has returning of 60 DEG C of burin-in process of full electric high temperature and charge and discharge cycles and surveys technique 3, A-battery repaired,
(1), 55 mA constant-current constant-voltage charging 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 charging 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 charging 180 min, upper voltage limit 3.65 V, cut-off current 55 mA;
(6), 60 DEG C of storages of high temperature 4 days;
(7), 550 mA constant-current constant-voltage chargings are to upper voltage limit 3.65 V, cut-off current 55 mA; Leave standstill 10 min;
(8), 220 mA constant-current discharge 60 min, turn 550 mA constant-current discharge 30 min, then turn 1100 mA constant-current discharge 70 min, lower voltage limit 2.0 V; Leave standstill 10 min;
(9), 220 mA constant-current discharge 20 min, lower voltage limit 2.0 V;
(10), 45 DEG C of high-temperature storage 4 days (survey voltage before and after high temperature, the results are shown in Table 3).
Table 3. uses the situation that technique 3 is repaired A-battery of surveying of returning.
As shown in table 3, no matter be nothing or the A-battery that has full electric high temperature ageing, after returning survey, cell voltage can be gone up substantially, and battery obtains stability.But similar to Example 2, still there is minority battery to repair unsuccessful.It is already destroyed before reparation that the unsteadiness of this type of battery should mainly arise from electrode surface state, or the surface state of electrode originally with regard to defectiveness (as electrode material fault of construction and surperficial coated with conductive agent imperfect).This type of battery is to be difficult to reach stability by follow-up discharging and recharging with certain environmental aging processing.
Need in addition to propose a bit, adopt the fierce renovation technique of these 60 DEG C of high temperature ageings, be mainly aimed at those batteries that are difficult to repair and implement, just employing in unavoidable situation.Because, in technical background, mention, if the surface state of electrode is not yet stable, at high temperature, and the full electric battery of band, electrode surface can form a large amount of adsorption things, produces thick SEI film, consumes a large amount of Li
+, cause capacity loss, internal resistance to be increased.
embodiment 4(comparative example 1)
Get the A-battery that there is no to shelve and expire through being longer than 12 h high temperature before changing into electric high temperature ageing processing, carry out the following survey (return and survey technique 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 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 DEG C of high-temperature storage 4 days (survey voltage before and after high temperature, the results are shown in Table 4).
As shown in table 4, for this type of A-battery, through once returning after survey, stability improves undesirable.From embodiment above, for the A-battery that has full electric high temperature ageing processing, be than the more difficult reparation of the A-battery that there is no this processing.Therefore, for reparation, those have the A-battery of full electric high temperature ageing processing to above technique, and it is more undesirable repairing result.
The situation of change of table 4. A-battery voltage after returning survey
embodiment 5(comparative example 2)
To contrast the once situation of returning survey technique 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 discharge 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 DEG C of high-temperature storage 4 days (survey voltage before and after high temperature, the results are shown in Table 5).
Table 5. is the situation of survey technique to A-battery reparation of returning of charge and discharge cycles once.
As shown in table 5, reparation result is undesirable.
embodiment 6(comparative example 3)
Below to not carrying out repeatedly loop test (return and survey technique 6) through the A-battery of overfill electricity high temperature ageing processing.The technological parameter arranging is as follows:
(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 discharge 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 shown in Fig. 1 and Fig. 2);
(6), 0.2 C constant-current discharge 20 min, lower voltage limit 2.0 V;
(7), the high-temperature storage 4 days (survey voltage before and after high temperature, the results are shown in Table 6) of 45 DEG C.
As shown in table 6, adopt there is repeatedly charge and discharge cycles return survey technique, the reparation of A-battery is had to certain effect.This explanation, repeatedly circulation is conducive to form stable SEI film.This can illustrate 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), in the time discharging and recharging for the first time, coulombic efficiency is lower, and the loss of capacity is mainly 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% substantially, illustrates that SEI film is stable gradually.This and consistent (Chem. Mater., 2009,21,2895) of bibliographical information.
Table 6. A-battery is through 10 charge and discharge cycles steadiness after treatment.
Repeatedly SEI film no doubt can be constantly stablized in circulation, and still, this stability is not necessarily permanent, as the situation of table 6.But, on the basis of this stability, battery is carried out to full electric high temperature ageing processing, can make battery obtain permanent stablizing.
Know from the result of above A-battery being returned to survey, if A-battery is not through the processing of overfill electricity high temperature ageing, can preferably returns and survey technique 1; As A-battery has through the processing of overfill electricity high temperature ageing, can preferably return and survey technique 2; For the A-battery that is difficult to repair, can adopt to return and survey technique 3.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (2)
1. 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 by low pressure lithium iron phosphate dynamic battery by charge-discharge magnification, then constant voltage leave standstill 10 min;
2) be that 0.5 C discharges 180 min to voltage 2.0 V by low pressure lithium iron phosphate dynamic battery after treatment step 1 by charge-discharge magnification; Leave standstill 10 min;
3) be that 0.5 C charges 180 min to voltage 3.65 V by low pressure lithium iron phosphate dynamic battery after treatment step 2 by charge-discharge magnification; Leave standstill 10 min;
4) be that 1 C discharges 90 min to voltage 2.0 V by low pressure lithium iron phosphate dynamic battery after treatment step 3 by charge-discharge magnification; Leave standstill 10 min;
5) be that 0.5 C charges 180 min to voltage 3.65 V by low pressure lithium iron phosphate dynamic battery after treatment step 4 by charge-discharge magnification; Leave standstill 10 min;
6) be that 1 C discharges 90 min to voltage 2.0 V by low pressure lithium iron phosphate dynamic battery after treatment step 5 by charge-discharge magnification; Leave standstill 10 min;
7) be that 0.5 C charges 180 min to voltage 3.65 V by low pressure lithium iron phosphate dynamic battery after treatment step 6 by charge-discharge magnification;
8) lithium iron phosphate dynamic battery step 7 being obtained is placed under 45 DEG C of conditions and stores 7 days;
Low pressure lithium iron phosphate dynamic battery, is the burin-in process not having through being longer than the full electric high temperature 40-80oC that shelves and be longer than 4 d of the high temperature 40-80oC of 12 h before changing into, and does not also overcharge, mistake is put, the battery of extruding, short circuit, the destructive test of acupuncture;
The voltage of described low pressure lithium iron phosphate dynamic battery is 0.5 to 2.52 V;
Low pressure lithium iron phosphate dynamic battery, after repairing, is shelved 4 d under 45oC hot environment, and battery open circuit voltage is greater than 2.52 V, and the variation of its open circuit voltage is no more than 0.10 V every day in the time of high temperature test.
2. a method of repairing low pressure lithium iron phosphate dynamic battery material, is characterized in that, comprises following step:
1) low pressure lithium iron phosphate dynamic battery is pressed to 55 mA constant current charge 10 h to voltage 3.65 V, leave standstill 10 min;
2) low pressure lithium iron phosphate dynamic battery after treatment step 1 is pressed to 220 mA constant-current discharge 180 min to voltage 2.0 V; Leave standstill 10 min;
3) low pressure lithium iron phosphate dynamic battery after treatment step 2 is pressed to 55 mA constant current charge 10 h to voltage 3.65 V, constant voltage leaves standstill 10 min;
4) low pressure lithium iron phosphate dynamic battery after treatment step 3 is pressed to 220 mA constant-current discharge to 2.0 V, constant voltage leaves standstill 10 min;
5) low pressure lithium iron phosphate dynamic battery after treatment step 4 is pressed to 550 mA constant-current constant-voltage charging 180 min to voltage 3.65 V, cut-off current 55 mA;
6) lithium iron phosphate dynamic battery step 5 being obtained is placed at 60 DEG C and stores 4 days;
Low pressure lithium iron phosphate dynamic battery, is the burin-in process not having through being longer than the full electric high temperature 40-80oC that shelves and be longer than 4 d of the high temperature 40-80oC of 12 h before changing into, and does not also overcharge, mistake is put, the battery of extruding, short circuit, the destructive test of acupuncture;
The voltage of described low pressure lithium iron phosphate dynamic battery is 0.5 to 2.52 V;
Low pressure lithium iron phosphate dynamic battery, after repairing, is shelved 4 d under 45oC hot environment, and low pressure lithium iron phosphate dynamic battery open circuit voltage is greater than 2.52 V, and the variation of its open circuit voltage is no more than 0.10 V every day in the time of high temperature test.
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| 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 |
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| CN101308943A (en) * | 2008-06-06 | 2008-11-19 | 恒正科技（苏州）有限公司 | Lithium ionic cell formation processing method |
| CN102394315A (en) * | 2011-11-18 | 2012-03-28 | 武汉银泰科技燃料电池有限公司 | Cell characteristic vector based lithium ion cell configuration method |
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