CN102916164B - A kind of method of mending lithium to based lithium-ion battery positive plate - Google Patents
A kind of method of mending lithium to based lithium-ion battery positive plate Download PDFInfo
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Abstract
The invention belongs to technical field of lithium ion, relate in particular to a kind of method of mending lithium to based lithium-ion battery positive plate, in inert atmosphere, by organolithium spray solution or drip in positive plate surface, make the lithium ion in organolithium solution be reduced into lithium metal and embed in positive plate, then dry positive plate. With respect to prior art, the present invention passes through even organolithium spray solution or drips the surface at positive plate, realize " wet method benefit lithium ", thereby while effectively avoiding dry method to mend lithium, metallic lithium powder is aerial floating, ensure production safety, and whole operation is simple, cost is lower, mending the amount of lithium can accurately be controlled by the time of amount, sprinkling or the dropping of the organolithium solution that sprays or drip, to reach the object of even benefit lithium, what prevent positive plate analyses lithium and distortion, improves the efficiency first of battery, and then improves the energy density of battery. In addition, the invention also discloses another method to based lithium-ion battery positive plate benefit lithium.
Description
Technical field
The invention belongs to technical field of lithium ion, relate in particular to a kind of method of mending lithium to based lithium-ion battery positive plate.
Background technology
Lithium ion battery, owing to having the advantage of high voltage, high-energy-density and long circulation life, becomes one of secondary cell that range of application is the widest. But along with the development of portable electric appts microminiaturization, long standby, and electric bicycle, electric automobile etc. are high-power, the enabling of high-energy equipment, all the proposition of the energy density to the lithium ion battery as accumulation power supply more and more higher requirement.
In the initial charge process of battery, because can consuming part, the formation of negative plate surface solid electrolyte film (SEI film) moves the lithium of coming from positive plate, cause therefrom the loss of anode material of lithium, thereby reduced the capacity of battery, cause the battery reduction of efficiency first. Particularly in the time that the active material in negative plate is alloy material (as silicon alloy and ashbury metal etc.), show particularly evidently.
In order to reduce the reduction of the battery capacity of bringing due to the irreversible capacity of battery in first charge-discharge process, more existing patent literatures some solutions. The Chinese patent application that for example publication number is CN1290209C is mentioned lithium metal, negative material and on-aqueous liquid is mixed to form to slurry, slurry is coated on collector, then dry slurries, pour into electrolyte after roll-in, make lithium powder diffuse into active material inside. Although the method can improve efficiency first, because lithium metal reactivity is higher, whole operating environment need to be carried out in anhydrous dry environment, and will strictly control temperature, causes complex procedures. The on-aqueous liquid of selecting in addition can not react with metallic lithium powder in mixed process, and this type of on-aqueous liquid is mostly inflammable and explosive liquid, such as the oxolane of mentioning in this patent application, and toluene and varsol etc. And follow-up coating, cold pressing and winding process all must carry out under dry environment, to environmental requirement harshness, negative plate cost of manufacture is higher. In addition, because lithium powder is lighter, in slurry, be easy to floating, cause the difficulty of interpolation.
For another example the Chinese patent application that application number is 201110268072 discloses a kind of lithium ion battery of mending lithium positive pole that comprises, this battery is because the existence of mending lithium positive pole has higher energy density. But, in this application, mainly by the mode of energising, positive plate and negative plate are mended to lithium, can consume more energy, be unfavorable for energy-conserving and environment-protective, and this application need to carry out the circulation of twice benefit lithium, operate comparatively time-consumingly and complicated, be unfavorable for the raising of production efficiency.
Certainly, can also adopt the method that dry powder adds to add lithium powder to positive plate surface to realize the operation of benefit lithium, but because lithium powder easily floats in air, can cause larger potential safety hazard to operating personnel.
In view of this, the necessary one that provides is mended lithium method to based lithium-ion battery positive plate, the method adopts " wet method benefit lithium ", can effectively avoid dry method to mend lithium time, metallic lithium powder is aerial floating, ensure production safety, and whole operation is simple, efficiency is higher, save the energy, cost is lower, mending the amount of lithium can accurately be controlled by the time of amount, sprinkling or the dropping of the organolithium solution that sprays or drip or the time that positive plate soaks in organolithium solution, to reach the object of even benefit lithium.
Summary of the invention
The object of the invention is to: for the deficiencies in the prior art, mend lithium method and provide a kind of to based lithium-ion battery positive plate, the method adopts " wet method benefit lithium ", can effectively avoid dry method to mend lithium time, metallic lithium powder is aerial floating, ensure production safety, and whole operation is simple, efficiency is higher, save the energy, cost is lower, the amount of mending lithium can be by the amount of the organolithium solution that sprays or drip, the time of spraying or drip is accurately controlled, to reach the object of even benefit lithium, inhomogeneous to overcome benefit lithium technology embedding lithium of the prior art, quantitative embedding lithium exactly, to environmental requirement harshness, complicated operation, be unfavorable for saving the deficiency of the energy.
In order to achieve the above object, the present invention adopts following technical scheme: a kind of method of mending lithium to based lithium-ion battery positive plate, in inert atmosphere, by organolithium spray solution or drip in positive plate surface, make the lithium ion in organolithium solution be reduced into lithium metal and embed in positive plate, then dry positive plate.
The one of mending the method for lithium to based lithium-ion battery positive plate as the present invention is improved, at least one in hexane solution, the hexane solution of tert-butyl lithium and the hexane solution of phenyl lithium that described organolithium solution is n-BuLi. N-BuLi, tert-butyl lithium and phenyl lithium all can be dissolved in n-hexane and form uniform solution, are convenient to spray or dropwise operation to positive plate.
The one of mending the method for lithium to based lithium-ion battery positive plate as the present invention is improved, described inert atmosphere is nitrogen atmosphere or argon gas atmosphere, because lithium metal itself has higher activity, if run into airborne water or carbon dioxide etc., the security incident such as easily blast, therefore need in inert atmosphere, operate, to ensure production safety.
The one of mending the method for lithium to based lithium-ion battery positive plate as the present invention is improved, the preparation of described organolithium solution is carried out in inert atmosphere, concrete operations are that lithium powder is dissolved in organic solvent, described organic solvent is at least one in biphenyl and dimethoxy-ethane, lithium powder is dissolved in these solvents, also be that chemical reaction has occurred in fact, the valence state of lithium from 0 having become+1, formation be the compound of lithium.
The one of mending the method for lithium to based lithium-ion battery positive plate as the present invention is improved, and the concentration of described organolithium solution is 0.1M-10M. If the concentration of organolithium solution is too low, the amount of mending the organolithium solution that need to spray or drip when lithium to negative pole is too large, can make time of dry needs of later stage positive plate longer, affects production efficiency, also can cause the waste to solvent; If the concentration of organolithium solution is too high, in the time only needing to carry out trace benefit lithium to positive plate, the interpolation of organolithium solution is just difficult to control, and is easy to cause benefit lithium excessive, finally causes positive plate to analyse lithium, initiation potential safety hazard.
With respect to prior art, the present invention passes through even organolithium spray solution or drips the surface at positive plate, realize " wet method benefit lithium ", thereby while effectively avoiding dry method to mend lithium, metallic lithium powder is aerial floating, ensure production safety, and whole operation is simple, without carrying out benefit lithium twice, efficiency is higher, and without energising, therefore can save the energy, reduce costs, the amount of mending lithium can be by the amount of the organolithium solution that sprays or drip, the time of spraying or drip is accurately controlled, to reach the object of even benefit lithium, what prevent positive plate analyses lithium and distortion, improve the efficiency first of battery, and then the energy density of raising battery, and can improve the cycle performance of battery. in addition, the method compared with lithium metal being added to the method for mending lithium in cathode size, there will not be due to lithium metal powder gentlier, easily in slurry, float, cause slurry problem pockety inhomogeneous to such an extent as to lithium powder in follow-up adding procedure.
In addition, the present invention also provides another method of mending lithium to based lithium-ion battery positive plate, in inert atmosphere, positive plate is immersed in organolithium solution, make the lithium ion in organolithium solution be reduced into lithium metal and embed in positive plate, then dry positive plate.
The one of mending the method for lithium to based lithium-ion battery positive plate as the present invention is improved, at least one in hexane solution, the hexane solution of tert-butyl lithium and the hexane solution of phenyl lithium that described organolithium solution is n-BuLi. At least one in hexane solution, the hexane solution of tert-butyl lithium and the hexane solution of phenyl lithium that described organolithium solution is n-BuLi. N-BuLi, tert-butyl lithium and phenyl lithium all can be dissolved in n-hexane and form uniform solution, are convenient to lithium and embed equably in positive plate.
The one of mending the method for lithium to based lithium-ion battery positive plate as the present invention is improved, and described inert atmosphere is nitrogen atmosphere or argon gas atmosphere. Because lithium metal itself has higher activity, if run into airborne water or carbon dioxide etc., the security incident such as easily blast therefore need to operate, to ensure production safety in inert atmosphere.
The one of mending the method for lithium to based lithium-ion battery positive plate as the present invention is improved, the preparation of described organolithium solution is carried out in inert atmosphere, concrete operations are that lithium powder is dissolved in organic solvent, described organic solvent is at least one in biphenyl and dimethoxy-ethane, lithium powder is dissolved in these solvents, also be that chemical reaction has occurred in fact, the valence state of lithium from 0 having become+1, formation be the compound of lithium.
The one of mending the method for lithium to based lithium-ion battery positive plate as the present invention is improved, and the concentration of described organolithium solution is 0.1M-10M. If the concentration of organolithium solution is too low, the amount of mending the organolithium solution that need to spray or drip when lithium to negative pole is too large, can make time of dry needs of later stage positive plate longer, affects production efficiency, also can cause the waste to solvent; If the concentration of organolithium solution is too high, in the time only needing to carry out trace benefit lithium to positive plate, the interpolation of organolithium solution is just difficult to control, and is easy to cause benefit lithium excessive, finally causes positive plate to analyse lithium, initiation potential safety hazard.
With respect to prior art, the present invention passes through even organolithium spray solution or drips the surface at positive plate, realize " wet method benefit lithium ", thereby while effectively avoiding dry method to mend lithium, metallic lithium powder is aerial floating, ensure production safety, and whole operation is simple, without carrying out benefit lithium twice, efficiency is higher, and without energising, therefore can save the energy, reduce costs, the time that the amount of benefit lithium can be soaked by positive plate in organolithium solution is accurately controlled, to reach the object of even benefit lithium, what prevent positive plate analyses lithium and distortion, improve the efficiency first of battery, and then the energy density of raising battery, and can improve the cycle performance of battery. in addition, the method compared with lithium metal being added to the method for mending lithium in cathode size, there will not be due to lithium metal powder gentlier, easily in slurry, float, cause slurry problem pockety inhomogeneous to such an extent as to lithium powder in follow-up adding procedure.
Detailed description of the invention
The invention provides a kind of method of mending lithium to based lithium-ion battery positive plate.
Embodiment 1:The present embodiment provides a kind of method of mending lithium to based lithium-ion battery positive plate, in nitrogen atmosphere, the hexane solution of the n-BuLi that is 1M by concentration is sprayed on positive plate surface (active material in positive plate is cobalt acid lithium), make the lithium ion in n-BuLi be reduced into lithium metal and embed in positive plate, making the lithium-inserting amount in cobalt acid lithium is 5% of cobalt acid lithium total capacity, then dry positive plate, completes and mends lithium operation.
Embodiment 2:The present embodiment provides a kind of method of mending lithium to based lithium-ion battery positive plate, in argon gas atmosphere, the hexane solution of the tert-butyl lithium that is 3M by concentration drips in positive plate surface (active material in positive plate is LiMn2O4), make the lithium ion in organolithium solution be reduced into lithium metal and embed in positive plate, making the lithium-inserting amount in LiMn2O4 is 15% of LiMn2O4 total capacity, then dry positive plate, completes and mends lithium operation.
Embodiment 3:The present embodiment provides a kind of method of mending lithium to based lithium-ion battery positive plate, in nitrogen atmosphere, the hexane solution of the phenyl lithium that is 5M by concentration drips in positive plate surface (active material in positive plate is LiFePO4), make the lithium ion in phenyl lithium be reduced into lithium metal and embed in positive plate, making the lithium-inserting amount in LiFePO4 is 0.01% of LiFePO4 total capacity, then dry positive plate, completes and mends lithium operation.
Embodiment 4:The present embodiment provides a kind of method of mending lithium to based lithium-ion battery positive plate, in argon gas atmosphere, concentration is to the hexane solution of n-BuLi of 0.5M and the mixed solution of the hexane solution of tert-butyl lithium and drips in positive plate surface (active material in positive plate is lithium nickelate), make the lithium ion in n-BuLi be reduced into lithium metal and embed in positive plate, making the lithium-inserting amount in lithium nickelate is 20% of lithium nickelate total capacity, then dry positive plate, completes and mends lithium operation.
Embodiment 5:The present embodiment provides a kind of method of mending lithium to based lithium-ion battery positive plate, in argon gas atmosphere, lithium powder is dissolved in biphenyl, obtaining concentration is the organolithium solution of 0.1M, in positive plate surface (active material in positive plate is nickle cobalt lithium manganate), make the lithium ion in organolithium solution be reduced into lithium metal and embed in positive plate this organolithium spray solution, making the lithium-inserting amount in nickle cobalt lithium manganate is 2% of nickle cobalt lithium manganate total capacity, then dry positive plate, completes and mends lithium operation.
Embodiment 6:The present embodiment provides a kind of method of mending lithium to based lithium-ion battery positive plate, in nitrogen atmosphere, lithium powder is dissolved in dimethoxy-ethane, obtaining concentration is the organolithium solution of 10M, in positive plate surface (active material in positive plate is cobalt acid lithium), make the lithium ion in organolithium solution be reduced into lithium metal and embed in positive plate this organolithium spray solution, making the lithium-inserting amount in cobalt acid lithium is 5% of cobalt acid lithium total capacity, then dry positive plate, completes and mends lithium operation.
Embodiment 7:The present embodiment provides a kind of method of mending lithium to based lithium-ion battery positive plate, in nitrogen atmosphere, lithium powder is dissolved in the mixed solvent (volume ratio of the two is respectively 4:1) of dimethoxy-ethane and biphenyl, obtaining concentration is the organolithium solution of 10M, by this organolithium spray solution, in positive plate surface, (active material in positive plate is the mixture of cobalt acid lithium and LiMn2O4, the mass ratio of the two is respectively 4:1), make the lithium ion in organolithium solution be reduced into lithium metal and embed in positive plate, making the lithium-inserting amount in active material is 12% of active material total capacity, then dry positive plate, complete and mend lithium operation.
To in embodiment 1 to 7, be assembled into battery core through the positive plate of benefit lithium operation and the mode of negative plate and barrier film process coiling respectively, pass through afterwards closedtop, fluid injection (lithium salt is 1mol/L), leave standstill, change into the operations such as (capacity of changing into is ICC0), shaping and degasification, prepare lithium ion battery. Wherein, the battery number consecutively that adopts the positive plate of embodiment 1 to 7 to make is S1-S7. Wherein, the negative electrode active material being numbered in the battery of S1, S2, S5 and S6 is graphite, the negative electrode active material that is numbered the battery of S3 and S4 is silicon, and the negative electrode active material that is numbered the battery of S7 is the mixture of silicon and graphite (mass ratio of the two is 1:4).
Be assembled into battery core with negative plate and barrier film through the mode of reeling by mending the preoperative positive plate of lithium (not through mending the positive plate of lithium) in embodiment 1 and embodiment 7, pass through afterwards closedtop, fluid injection (lithium salt is 1mol/L), leave standstill, change into the operations such as (capacity of changing into is ICC0), shaping and degasification, prepare lithium ion battery, the numbering of battery is followed successively by D1-D2. Wherein, the negative electrode active material that is numbered the battery of D1 is graphite, and the negative electrode active material that is numbered the battery of D2 is the mixture of silicon and graphite (mass ratio of the two is 1:4).
The present invention also provides another method of mending lithium to based lithium-ion battery positive plate.
Embodiment 1:The present embodiment provides a kind of method of mending lithium to based lithium-ion battery positive plate, in argon gas atmosphere, lithium powder is dissolved in dimethoxy-ethane, obtaining concentration is the organolithium solution of 6M, positive plate (active material in positive plate is cobalt acid lithium) is soaked in this organolithium solution, makes the lithium ion in organolithium solution be reduced into lithium metal and embed in positive plate, making the lithium-inserting amount in cobalt acid lithium is 8% of cobalt acid lithium total capacity, then dry positive plate, completes and mends lithium operation.
Embodiment 2:The present embodiment provides a kind of method of mending lithium to based lithium-ion battery positive plate, in argon gas atmosphere, lithium powder is dissolved in biphenyl, obtaining concentration is the organolithium solution of 4M, positive plate (active material in positive plate is LiMn2O4) is soaked in this organolithium solution, makes the lithium ion in organolithium solution be reduced into lithium metal and embed in positive plate, making the lithium-inserting amount in LiMn2O4 is 10% of LiMn2O4 total capacity, then dry positive plate, completes and mends lithium operation.
Embodiment 3:The present embodiment provides a kind of method of mending lithium to based lithium-ion battery positive plate, in argon gas atmosphere, positive plate (active material in positive plate is LiFePO4) is soaked in the hexane solution of n-BuLi that concentration is 3.5M, make the lithium ion in n-BuLi be reduced into lithium metal and embed in positive plate, making the lithium-inserting amount in LiFePO4 is 10% of LiFePO4 total capacity, then dry positive plate, completes and mends lithium operation.
Embodiment 4:The present embodiment provides a kind of method of mending lithium to based lithium-ion battery positive plate, in nitrogen atmosphere, positive plate (active material in positive plate is lithium nickelate) is soaked in the hexane solution of tert-butyl lithium that concentration is 7.5M, make the lithium ion in tert-butyl lithium be reduced into lithium metal and embed in positive plate, making the lithium-inserting amount in lithium nickelate is 15% of lithium nickelate total capacity, then dry positive plate, completes and mends lithium operation.
Embodiment 5:The present embodiment provides a kind of method of mending lithium to based lithium-ion battery positive plate, in nitrogen atmosphere, positive plate (active material in positive plate is nickle cobalt lithium manganate) is soaked in the hexane solution of phenyl lithium that concentration is 9M, make the lithium ion in phenyl lithium be reduced into lithium metal and embed in positive plate, making the lithium-inserting amount in nickle cobalt lithium manganate is 15% of nickle cobalt lithium manganate total capacity, then dry positive plate, completes and mends lithium operation.
To in embodiment 1 to 5, be assembled into battery core through the positive plate of benefit lithium operation and the mode of positive plate and barrier film process coiling respectively, pass through afterwards closedtop, fluid injection (lithium salt is 1mol/L), leave standstill, change into the operations such as (capacity of changing into is ICC0), shaping and degasification, prepare lithium ion battery. Wherein, the battery number consecutively that adopts the positive plate of embodiment 1 to 5 to make is S8-S12. Wherein, the negative electrode active material that is numbered the lithium ion battery of S8, S9, S11 and S12 is graphite, and the negative electrode active material that is numbered the lithium ion battery of S10 is silicon.
Be assembled into battery core with positive plate and barrier film through the mode of reeling by mending the preoperative positive plate of lithium (not through mending the positive plate of lithium) in embodiment 3, pass through afterwards closedtop, fluid injection (lithium salt is 1mol/L), leave standstill, change into the operations such as (capacity of changing into is ICC0), shaping and degasification, prepare lithium ion battery, battery be numbered D3, the negative electrode active material of this battery is silicon.
In 35 DEG C of environment, respectively the battery that is numbered S1-S12 and D1-D3 is carried out to volume test by following flow process: first leave standstill 3min; Then with the charging current constant-current charge of 0.5C to 4.2V, then constant-voltage charge is to 0.05C, obtains charging capacity AGC0; Leave standstill 3min; Obtain discharge capacity D0 first with the discharge current constant-current discharge of 0.5C to 3.0V again; After leaving standstill 3min, complete volume test; Coulomb efficiency first of calculating afterwards battery core is: D0/ (ICC0+AGC0), acquired results is shown in table 1.
Charge-discharge magnification with 0.5C/0.5C in 25 DEG C of environment carries out cycle performance test to the battery that is numbered S1-S12 and D1-D3 respectively, capacity after initial charge is C0, record the capacity C 500 of 500 rear batteries of circulation simultaneously, calculate the capability retention C500/C0 of battery after 500 circulations, acquired results is shown in table 1.
As can be seen from Table 1: the anode active material that is numbered the battery of S1, S2, S5, S6, S8, S9, S11 and S12 and D1 is graphite, more several persons' coulomb efficiency first can be found out: coulomb efficiency tool first after adopting lithium-rich anode sheet prepared by method of the present invention to be applied in battery is significantly improved, and capability retention after 500 circulations also improves greatly; The anode active material that is numbered the battery of S3, S4, S10 and D3 is silicon, result by D3 can be found out, adopt silicon as anode active material and adopt while not mending the positive plate of lithium, coulomb efficiency first of battery is lower, be only 65%, adopt method of the present invention to mend after lithium positive plate, even if be slight benefit lithium, coulomb efficiency first of battery is also improved (seeing S3), after benefit lithium is more, (seeing S4 and S10) just can be greatly improved for coulomb efficiency first of battery and cycle performance (capability retention after 500 circulations); The battery that is numbered S7 and D2 all adopts the mixture of silicon and graphite as anode active material, and the ratio of two kinds of active materials identical (silicon and graphite mass ratio be 1:4), the relatively coulomb efficiency first of the two, can obviously find out: the initial charge efficiency and the cycle performance that adopt the raising battery that positive plate prepared by method of the present invention can be larger.
Table 1: the volume test result and coulomb efficiency first that are numbered the battery of S1-S12.
| Numbering | ICC0+AGC0（mAh） | D0（mAh） | Coulomb efficiency first | Capability retention after 500 circulations |
| S1 | 1578 | 1499 | 95% | 92% |
| S2 | 1578 | 1578 | 100% | 90% |
| S3 | 2308 | 1500.2 | 65.01% | 88% |
| S4 | 2308 | 2123 | 92% | 89% |
| S5 | 1578 | 1562 | 99% | 90% |
| S6 | 1578 | 1568 | 99% | 91% |
| S7 | 1718 | 1598 | 93% | 89% |
| S8 | 1578 | 1568 | 99% | 92% |
| S9 | 1578 | 1546 | 98% | 92% |
| S10 | 2308 | 2077 | 90% | 91% |
| S11 | 1578 | 1499 | 95% | 92% |
| S12 | 1578 | 1515 | 96% | 92% |
| D1 | 1578 | 1420 | 90% | 85% |
| D2 | 1718 | 1460 | 85% | 84% |
| D3 | 2308 | 1500 | 65% | 82% |
It should be noted that, although the only example using graphite and silicon as anode active material of the present invention, those skilled in the art can also use some other conventional anode material, for example silicon-carbon alloys, ashbury metal etc.
In sum, the present invention passes through even organolithium spray solution or drips the surface at positive plate, realize " wet method benefit lithium ", thereby while effectively avoiding dry method to mend lithium, metallic lithium powder is aerial floating, ensure production safety, and whole operation is simple, cost is lower, the amount of mending lithium can be by the amount of the organolithium solution that sprays or drip, the time of spraying or dripping, the soak time of positive plate in organolithium solution accurately controlled, to reach the object of even benefit lithium, what prevent positive plate analyses lithium and distortion, improve the efficiency first of battery, and then the energy density of raising battery, and can significantly improve the cycle performance of battery. in addition, the method compared with lithium metal being added to the method for mending lithium in cathode size, there will not be due to lithium metal powder gentlier, easily in slurry, float, cause slurry problem pockety inhomogeneous to such an extent as to lithium powder in follow-up adding procedure.
The method of mending lithium to based lithium-ion battery positive plate that the present invention proposes, be described by embodiment, person skilled obviously can change rich lithium anode preparation method of lithium ion battery as herein described in content of the present invention, spirit and scope or suitably change and combination not departing from, and realizes the technology of the present invention. Special needs to be pointed out is, all similar replacements and change apparent to those skilled in the artly, they are deemed to be included in spirit of the present invention, scope and content.
Claims (10)
1. mend the method for lithium to based lithium-ion battery positive plate for one kind, it is characterized in that: in inert atmosphere, by organolithium spray solution or drip in positive plate surface, make the lithium ion in organolithium solution be reduced into lithium metal and embed in positive plate, then dry positive plate.
2. method of mending lithium to based lithium-ion battery positive plate according to claim 1, is characterized in that: at least one in hexane solution, the hexane solution of tert-butyl lithium and the hexane solution of phenyl lithium that described organolithium solution is n-BuLi.
3. method of mending lithium to based lithium-ion battery positive plate according to claim 1, is characterized in that: described inert atmosphere is nitrogen atmosphere or argon gas atmosphere.
4. method of mending lithium to based lithium-ion battery positive plate according to claim 1, it is characterized in that: the preparation of described organolithium solution is carried out in inert atmosphere, concrete operations are that lithium powder is dissolved in organic solvent, and described organic solvent is at least one in biphenyl and dimethoxy-ethane.
5. method of mending lithium to based lithium-ion battery positive plate according to claim 1, is characterized in that: the concentration of described organolithium solution is 0.1M-10M.
6. a method of mending lithium to based lithium-ion battery positive plate, is characterized in that: in inert atmosphere, positive plate is immersed in organolithium solution, makes the lithium ion in organolithium solution be reduced into lithium metal and embed in positive plate, then dry positive plate.
7. method of mending lithium to based lithium-ion battery positive plate according to claim 6, is characterized in that: at least one in hexane solution, the hexane solution of tert-butyl lithium and the hexane solution of phenyl lithium that described organolithium solution is n-BuLi.
8. method of mending lithium to based lithium-ion battery positive plate according to claim 6, is characterized in that: described inert atmosphere is nitrogen atmosphere or argon gas atmosphere.
9. method of mending lithium to based lithium-ion battery positive plate according to claim 6, it is characterized in that: the preparation of described organolithium solution is carried out in inert atmosphere, concrete operations are that lithium powder is dissolved in organic solvent, and described organic solvent is at least one in biphenyl and dimethoxy-ethane.
10. method of mending lithium to based lithium-ion battery positive plate according to claim 6, is characterized in that: the concentration of described organolithium solution is 0.1M-10M.
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| CN112382749B (en) * | 2020-07-03 | 2024-04-12 | 华中科技大学 | Lithium ion battery anode material and preparation method thereof |
| CN112349989B (en) * | 2020-11-05 | 2022-09-20 | 武汉大学 | Method for repairing and regenerating anode active material of waste lithium ion battery and obtained regenerated anode active material |
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| CN114243090A (en) * | 2021-12-17 | 2022-03-25 | 中国科学院电工研究所 | Lithium pre-embedding device and method of lithium ion energy storage device |
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