CN109877309A - A kind of stable metal lithium powder, preparation method thereof of surface polymer passivation and application - Google Patents
A kind of stable metal lithium powder, preparation method thereof of surface polymer passivation and application Download PDFInfo
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- CN109877309A CN109877309A CN201910207863.9A CN201910207863A CN109877309A CN 109877309 A CN109877309 A CN 109877309A CN 201910207863 A CN201910207863 A CN 201910207863A CN 109877309 A CN109877309 A CN 109877309A
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Abstract
The invention discloses a kind of stable metal lithium powder, preparation method thereof of surface polymer passivation and applications, in atmosphere of inert gases, lithium metal are heated to molten condition in organic inert solvent, dispersed effect obtains the metallic lithium powder of surface free passivation；Then it is acted on by the metallic lithium powder of passivator and surface free passivation of the long-chain polymer with active group, obtains the stable metal lithium powder of surface polymer passivation；Not only there is the effect of surface passivation by metallic lithium powder prepared by this method；And through prelithiation, after fluid injection, the trace polymer on lithium powder surface layer is soluble in electrolyte, to discharge internal lithium, so there is no insoluble lithium metals for inside battery, substantially increases the security performance of battery core and improve the effective rate of utilization of lithium metal.
Description
Technical field
The present invention relates to the stable metal lithium powder preparations that technical field of lithium batteries more particularly to a kind of surface polymer are passivated
Method and application.
Background technique
Lithium ion battery is the highest battery system of energy density in current commercialization secondary cell, and lithium-ion electric is commercialized
Pond has good circulation and safety in utilization, it is obtained largely in fields such as communication, traffic, electronic equipment, industrial products
Application, and quickly obtain bigger market.
The important directions of current lithium ion battery exploitation are to further increase the specific energy of battery, mainly pass through battery knot
The means such as the optimization of structure and the use higher new electrode materials of energy density.During battery initial charge, lithium ion
By positive deintercalation and enter cathode, then deviate from and enter anode by cathode during discharge, this process is also referred to as " rocking chair
Reaction process ".And the capacity of positive electrode has 5% to 15% or so decaying in this process, this is because positive plate
With the formation of negative electrode tab surface solid dielectric film (SEI film), to consume a certain amount of lithium ion.Therefore battery is reduced
Capacity, cause the first charge discharge efficiency of battery to reduce, especially when the active material in negative electrode tab is the alloy materials such as silicon or tin
It is particularly evident.Although this tunic is beneficial to the cyclical stability of positive and negative pole material, it can also reduce the appearance of positive electrode simultaneously
Amount, is always the target that researchers study so how to reduce or make up the consumption of lithium ion in SEI forming process.
The researcher of FMC Corp. is dissolved and is released it is proposed that stabilized metallic lithium powder is added in lithium ion battery
Lithium ion, to make up lithium ion consumed by SEI film.Finally, this method achieves apparent effect.Lithium powder adds
Enter to substantially increase the first charge-discharge efficiency of battery, therefore improves the specific energy of battery.
Nowadays there are mainly two types of disclosed battery prelithiation methods: (1) being stirred metallic lithium powder together with negative electrode slurry
Cathode is added；Exist since surface usually has nonconducting passivation layer (such as: Li2CO3), so needing through the methods of roll-in
It is crushed and releases internal Li.But many holes are left inside pole piece in this way, after the dissolution of lithium powder, or
It is that pole piece becomes uneven.Compacted density is not only reduced, electronics also will receive biggish shadow in the conduction of cathode
It rings (impedance increase), What is more to generate Li dendrite in pole piece thinner region.(2) dusting coating roller again is carried out in negative terminal surface
Pressure；But it is inconsistent due to the particle size of lithium powder.The metallic lithium powder normally resulted in compared with small particle cannot be crushed, and be caused
Internal Li cannot be played, and reducing the utilization rate of lithium powder, (utilization rate for factually verifying lithium in real metallic lithium powder is about only
70%), and in inside battery there are metallic lithium powder particle, there are biggish security risks.
In general, metallic lithium powder preparation process usually requires to coat one layer of Li2CO3, such as Publication No. on lithium powder surface
The application of the United States Patent (USP)s such as US 5567474, US 5776369 and US 5976403 is mentioned in the preparation process of metallic lithium powder
It is passed through CO2, to passive metal lithium powder surface；Or paraffin layer (CN 102255080A) is covered on surface；Or use fluorination
Agent, such as perfluoropentylamine (WO2007/005983A2)；Or the methods of phosphorus containg substances (such as US2008/0283155A1) generate surely
Surely the metallic lithium powder (Stabilize Lithium Metal Powder) changed makes it be more convenient for storing；But these methods be not because
For passivation prevent lithium metal from play or play not exclusively, be exactly be easy to happen in toxic, corrosivity or manufacturing process it is quick-fried
It is fried therefore unwelcome in industrial practice application.
In view of above analysis, although the method for adding lithium powder into lithium ion battery can significantly improve the head of battery
Secondary efficiency improves circulation etc., and has experimentally been verified, but it is not still promoted widely；Row
It is also to restrict in the factors such as the utilization of inside battery and safety in addition to the influence of itself security performance and price etc.
Its big reason promoted.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of stabilization of completely new surface polymer passivation
Metallic lithium powder preparation method and application.
To achieve the above object, the invention adopts the following technical scheme:
A kind of stable metal lithium powder, preparation method thereof of surface polymer passivation exists lithium metal in atmosphere of inert gases
Molten condition is heated in organic inert solvent, dispersed effect obtains the metallic lithium powder of surface free passivation；Then to have
The long-chain polymer of active group is the metallic lithium powder effect of passivator and surface free passivation, obtains surface polymer passivation
Stable metal lithium powder.
Preferably, the long-chain polymer with active group is one of the party object of following I-V general structure:
Preferably, 180 DEG C of the boiling point > of the organic inert solvent, viscosity 100cps-1000cps.
Preferably, the organic inert solvent is hendecane, dodecane, mineral oil mixture or linear polysiloxanes.
Preferably, in atmosphere of inert gases, first organic inert solvent is stirred and heated to more than melting temperature, then plus
Enter Battery grade lithium metal ingot, after lithium metal ingot melts completely, decentralized processing；Then the long chain polymeric for having active group is added
Object continues decentralized processing, obtains suspension as passivator；After suspension is cooled to room temperature, cleaned, filtering, vacuum drying
The stable metal lithium powder of surface polymer passivation is obtained afterwards.
Preferably, it is 10000-20000rpm that the condition for searching for decentralized processing, which is stirring rate,.
Accurate decentralized processing parameter (i.e. velocity of rotation and jitter time) depends on the size of required lithium powder particles,
(such as diameter, gear ring is big for the viscosity and the shearing force of agitating element that the distribution of lithium powder diameter depends on dispersion solvent
It is small)；Those skilled in the art can be easily wanted to prepare by testing subtly adjusting dispersing method accordingly
Lithium powder particle diameter distribution.
The stable metal lithium powder of the passivation of surface polymer prepared by the above method can be applied to prelithiation electro-chemical activity
Material.
Beneficial effects of the present invention are as follows: the present invention be using the long-chain polymer with active group by metallic lithium surface into
Row cladding, and be not to react to generate thick passivation layer with lithium metal, so there is higher ratio compared to conventional metals lithium powder
Capacity is not required to the lithium metal on surface layer carrying out passivity (such as Li2CO3)；The stable metal lithium powder prepared by the method for the invention is not
The only effect (convenient and safe transport, storage etc.) of surface passivation；And through prelithiation, after fluid injection, metallic lithium powder surface layer it is micro-
Weight polymers are soluble in electrolyte, so that internal lithium is discharged, so there is no insoluble lithiums for inside battery
Metal substantially increases the security performance of battery core and improves the utilization rate of lithium metal.
Detailed description of the invention
Fig. 1 is (to amplify 200 times, upper left illustration is light according to the stereoscan photograph of metallic lithium powder prepared by embodiment 1
Learn microscope photo)；
Fig. 2 is the partial size volume distribution curve for using laser particle analyzer to test according to metallic lithium powder prepared by embodiment 1；
Fig. 3 is the partial size distributed number curve for using laser particle analyzer to test according to metallic lithium powder prepared by embodiment 1；
Fig. 4 be by according to metallic lithium powder prepared by embodiment 1, comparative example 1 and certain commercial lithium powder in dry environment
It stores (open system, humidity < 2%), it is separately sampled after storage different time that button cell is made and carries out volume test, it tests
Its capacity and capacity attenuation figure of changing with storage time；
Fig. 5 be will according to metallic lithium powder prepared by embodiment 1 in full battery using surface be coated with roll-in method into
Row prelithiation, the first charge discharge efficiency and cycle life figure of changing of prepared battery core.
Specific embodiment
The present invention is described in further details below with reference to specific embodiment:
Embodiment 1
2L stainless steel (316L) double casing reactor with dispersing stirrer is placed in the glove box full of argon gas
In, the dimethicone of 400g Shin Etsu (viscosity 100cps) is added, is heated to internal temperature under the stirring of 150rpm
198 DEG C, the lithium metal ingot of 88.24g is added, test temperature is down to 184 DEG C after melting；Rate of dispersion is improved to 15000rpm simultaneously
It is kept for 3 minutes；Then speed is down to 150rpm, and 0.36g polycaprolactone (dimethicone for being scattered in 5g) is added with syringe；
Rate of dispersion is improved again to 15000rpm, and is kept for 3 minutes, and stirring is stopped.
Suspension is transferred to separatory funnel after being cooled to room temperature, and is cleaned multiple times with n-hexane, and with 100 mesh stainless steel mesh
After the filtering of undispersed bulky grain, vacuum drying obtains the stable metal lithium powder of surface polymer passivation, yield: 87.59%
(77.29g)；D50:20.82um；D99:50.84um.
Comparative example 1
2L stainless steel (316L) double casing reactor with dispersing stirrer is placed in the glove box full of argon gas
In, the dimethicone of 403g Shin Etsu (viscosity 100cps) is added, is heated to internal temperature under the stirring of 150rpm
195 DEG C, the lithium metal ingot of 88.91g is added, test temperature is down to 185 DEG C after melting；Rate of dispersion is improved to 15000rpm simultaneously
It is kept for 3 minutes；Then speed is down to 150rpm, is passed through 2.30g CO2 from disperser bottom；Rate of dispersion improve again to
15000rpm, and kept for 3 minutes, stop stirring.
Suspension is transferred to separatory funnel after being cooled to room temperature, and is cleaned multiple times with n-hexane, and with 100 mesh stainless steel mesh
After the filtering of undispersed bulky grain, vacuum drying obtains the metallic lithium powder of surface passivation, yield: 85.43% (75.96g)；
D50:24.33um；D99:53.79um.
Embodiment 2
2L stainless steel (316L) double casing reactor with dispersing stirrer is placed in the glove box full of argon gas
In, the dimethicone of 403g Shin Etsu (viscosity 100cps) is added, is heated to internal temperature under the stirring of 150rpm
197 DEG C, the lithium metal ingot of 88.93g is added, test temperature is down to 185 DEG C after melting；Rate of dispersion is improved to 10000rpm simultaneously
It is kept for 3 minutes；Then speed is down to 150rpm, and 0.36g polyaniline (dimethicone for being scattered in 5g) is added with syringe；Point
Scattered speed is improved again to 10000rpm, and is kept for 3 minutes, and stirring is stopped.
Suspension is transferred to separatory funnel after being cooled to room temperature, and is cleaned multiple times with n-hexane, and with 100 mesh stainless steel mesh
After the filtering of undispersed bulky grain, vacuum drying obtains the stable metal lithium powder of surface polymer passivation, yield: 89.76%
(79.82g)；D50:47.69um；D99:72.53um.
Embodiment 3
2L stainless steel (316L) double casing reactor with dispersing stirrer is placed in the glove box full of argon gas
In, the dimethicone of 403g Shin Etsu (viscosity 100cps) is added, is heated to internal temperature under the stirring of 150rpm
196 DEG C, the lithium metal ingot of 88.91g is added, test temperature is down to 183 DEG C after melting；Rate of dispersion is improved to 20000rpm simultaneously
It is kept for 3 minutes；Then speed is down to 150rpm, and 0.36g polyetheramine (dimethicone for being scattered in 5g) is added with syringe；Point
Scattered speed is improved again to 20000rpm, and is kept for 3 minutes, and stirring is stopped.
Suspension is transferred to separatory funnel after being cooled to room temperature, and is cleaned multiple times with n-hexane, and with 100 mesh stainless steel mesh
After the filtering of undispersed bulky grain, vacuum drying obtains the stable metal lithium powder of surface polymer passivation, yield: 83.32%
(74.08g)；D50:6.42um；D99:18.17um.
Embodiment 4
In being placed in the glove box full of argon gas with dispersing stirrer 2L stainless steel (316L) double casing reactor,
The dimethicone of 398g Shin Etsu (viscosity 1000cps) is added, internal temperature 199 is heated under the stirring of 150rpm
DEG C, the lithium metal ingot of 87.80g is added, test temperature is down to 183 DEG C after melting；Rate of dispersion is improved to 10000rpm and protected
It holds 3 minutes；Then speed is down to 150rpm, and 0.36g poly-N-isopropyl acrylamide is added with syringe and (is scattered in the diformazan of 5g
Base silicone oil)；Rate of dispersion is improved again to 10000rpm, and is kept for 3 minutes, and stirring is stopped.
Suspension is transferred to separatory funnel after being cooled to room temperature, and is cleaned multiple times with n-hexane, and with 100 mesh stainless steel mesh
After the filtering of undispersed bulky grain, vacuum drying obtains the stable metal lithium powder of surface polymer passivation, yield: 82.47%
(72.41g)；D50:24.52um；D99:38.79um.
Embodiment 5
In being placed in the glove box full of argon gas with dispersing stirrer 2L stainless steel (316L) double casing reactor,
The dimethicone of 395g Shin Etsu (viscosity 1000cps) is added, internal temperature 199 is heated under the stirring of 150rpm
DEG C, the lithium metal ingot of 87.13g is added, test temperature is down to 183 DEG C after melting；Rate of dispersion is improved to 15000rpm and protected
It holds 3 minutes；Then speed is down to 150rpm, and 0.36g polyphenylacetylene (dimethicone for being scattered in 5g) is added with syringe；Point
Scattered speed is improved again to 15000rpm, and is kept for 3 minutes, and stirring is stopped.
Suspension is transferred to separatory funnel after being cooled to room temperature, and is cleaned multiple times with n-hexane, and with 100 mesh stainless steel mesh
After the filtering of undispersed bulky grain, vacuum drying obtains the stable metal lithium powder of surface polymer passivation, yield: 80.58%
(70.21g)；D50:14.81um；D99:22.03um.
Embodiment 6
In being placed in the glove box full of argon gas with dispersing stirrer 2L stainless steel (316L) double casing reactor,
It is added 399g MT-260 paraffin oil (MORESCO Corporation, viscosity 500cps), is heated under the stirring of 150rpm
195 DEG C of internal temperature, the lithium metal ingot of 87.03g is added, test temperature is down to 183 DEG C after melting；By rate of dispersion improve to
12000rpm is simultaneously kept for 3 minutes；Then speed is down to 150rpm, and 0.36g polyaniline is added with syringe and (is scattered in the MT- of 5g
260 paraffin oils)；Rate of dispersion is improved again to 12000rpm, and is kept for 3 minutes, and stirring is stopped.
Suspension is transferred to separatory funnel after being cooled to room temperature, and is cleaned multiple times with n-hexane, and with 100 mesh stainless steel mesh
After the filtering of undispersed bulky grain, vacuum drying obtains the stable metal lithium powder of surface polymer passivation, yield: 85.62%
(74.52g)；D50:56.30um；D99:90.45um.
Embodiment 7
In being placed in the glove box full of argon gas with dispersing stirrer 2L stainless steel (316L) double casing reactor,
It is added 398g P-260 paraffin oil (MORESCO Corporation, viscosity 500cps), is heated under the stirring of 150rpm interior
195 DEG C of portion's temperature, the lithium metal ingot of 87.00g is added, test temperature is down to 184 DEG C after melting；By rate of dispersion improve to
12000rpm is simultaneously kept for 3 minutes；Then speed is down to 150rpm, and 0.36g polyaniline is added with syringe and (is scattered in the P- of 5g
260 paraffin oils)；Rate of dispersion is improved again to 12000rpm, and is kept for 3 minutes, and stirring is stopped.
Suspension is transferred to separatory funnel after being cooled to room temperature, and is cleaned multiple times with n-hexane, and with 100 mesh stainless steel mesh
After the filtering of undispersed bulky grain, vacuum drying, the stable metal lithium powder of surface polymer passivation is obtained, yield:
84.85% (73.82g)；D50:48.24um；D99:81.06um.
Embodiment 8
In being placed in the glove box full of argon gas with dispersing stirrer 2L stainless steel (316L) double casing reactor,
It is added 5 white mineral oil of 405g Drakeol@(Calumet penreco, viscosity 50cps), is heated under the stirring of 150rpm
199 DEG C of internal temperature, the lithium metal ingot of 89.38g is added, test temperature is down to 186 DEG C after melting；By rate of dispersion improve to
15000rpm is simultaneously kept for 3 minutes；Then speed is down to 150rpm, and 0.36g polyaniline is added with syringe and (is scattered in 5g's
5 white mineral oil of Drakeol@)；Rate of dispersion is improved again to 15000rpm, and is kept for 3 minutes, and stirring is stopped.
Suspension is transferred to separatory funnel after being cooled to room temperature, and is cleaned multiple times with n-hexane, and with 100 mesh stainless steel mesh
After the filtering of undispersed bulky grain, vacuum drying obtains the stable metal lithium powder of surface polymer passivation, yield: 86.73%
(77.52g)；D50:38.46um；D99:75.78um.
Effective metal lithium and specific capacity test:
Metal powder and certain commercial metal lithium prepared by metallic lithium powder that the present invention is prepared according to embodiment 1, comparative example 1
Powder is laid in culture dish, and is statically placed in 120h in the drying shed of humidity < 2%.
After certain time of repose, the powder of three 5mg is taken to dress up button cell (CR2430) and in blue electricity respectively
On tester carry out discharge capacity test (using lithium piece as cathode, by lithium metal powder be roll-in on copper foil of affluxion body as just
Pole, the mixed solution of ethylene carbonate (EC) and diethyl carbonate (DMC) (weight ratio 1:1) dissolved with the LiPF6 of 1mol/L
For electrolyte).
As a result as shown in figure 3, compared to comparative example 1 and certain commercial metal lithium powder capacity, prepared by the method for the present invention
Lithium metal powder, have higher specific capacity；And the capacitance loss after it is stablized is lower, illustrates institute in through the invention
The lithium metal powder of preparation has better lithium utilization rate and stability.
The stabilized lithium metal of the party of surface prepared by present invention object passivation can be used for prelithiation electro-chemical activity material
Material, specific:
It is mixed using the SiO material that first charge discharge efficiency is 63.4% with the graphite that first effect is 92.5% as cathode, with nickel cobalt acid
Lithium 622 (NCM622) uses the EC-DEC-EMC-FEC of 1M LiPF6 as diaphragm, electrolyte as anode, Celgard2300
(3:3:3:1) solution, LiPF6 are lithium hexafluoro phosphates, and EC is ethylene carbonate, and EMC is methyl ethyl ester, and FEC is fluoro
Ethylene carbonate；Preparation full battery is simultaneously divided into A, B group, takes in the present invention and bears by metallic lithium powder prepared by embodiment 1 to A group
Pole surface prelithiation operation, pre- lithium amount be by the first charge discharge efficiency of full battery be promoted to 92.5% calculated obtained by, B group is normal
Battery core without prelithiation.
At room temperature respectively with 1.0C/1.0C to A, B group battery core carries out charge and discharge, voltage range 3.0-4.2V,
Obtained charging and discharging curve as shown in figure 4, wherein the first charge-discharge efficiency of full battery has reached 92.8%, lithium metal powder
Effective rate of utilization (is computed commercial metal lithium powder, effective rate of utilization is about 70- under the conditions of same processes for 95.3%
80%).
As shown in Figure 4, surface coating roll-in is being carried out using metallic lithium powder foot couple silicon systems full battery prepared by the present invention
After prelithiation, the charge and discharge cycles curve of full battery has obtained apparent optimization.When the charge and discharge cycles of battery were to 400 weeks,
Its capacity retention ratio is improved by 90% to 94%, greatly improves the cycle performance of battery.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (7)
1. a kind of stable metal lithium powder, preparation method thereof of surface polymer passivation, it is characterised in that:, will in atmosphere of inert gases
Lithium metal is heated to molten condition in organic inert solvent, and dispersed effect obtains the metallic lithium powder of surface free passivation；So
It is acted on afterwards by the metallic lithium powder of passivator and surface free passivation of the long-chain polymer with active group, obtains surface aggregate
The stable metal lithium powder of object passivation.
2. a kind of stable metal lithium powder, preparation method thereof of surface polymer passivation according to claim 1, it is characterised in that:
The long-chain polymer with active group is one of the party object of following I-V general structure:
3. a kind of stable metal lithium powder, preparation method thereof of surface polymer passivation according to claim 1, it is characterised in that:
180 DEG C of the boiling point > of the organic inert solvent, viscosity 100cps-1000cps.
4. a kind of stable metal lithium powder, preparation method thereof of surface polymer passivation according to claim 1, it is characterised in that:
The organic inert solvent is hendecane, dodecane, mineral oil mixture or linear polysiloxanes.
5. a kind of stable metal lithium powder, preparation method thereof of surface polymer passivation according to claim 1, it is characterised in that:
In atmosphere of inert gases, first organic inert solvent is stirred and heated to more than melting temperature, Battery grade lithium metal is then added
Ingot, after lithium metal ingot melts completely, decentralized processing；Then the long-chain polymer with active group is added as passivator,
Continue decentralized processing, obtains suspension；After suspension is cooled to room temperature, surface aggregate is obtained after cleaned, filtering, vacuum drying
The stable metal lithium powder of object passivation.
6. a kind of stable metal lithium powder, preparation method thereof of surface polymer passivation according to claim 5, it is characterised in that:
It is 10000-20000rpm that the condition for searching for decentralized processing, which is stirring rate,.
7. a kind of stable metal lithium powder, preparation method thereof of surface polymer passivation described in -6 any one according to claim 1,
It is characterized by: the stable metal lithium powder of the passivation of surface polymer prepared by this method can be applied to prelithiation electro-chemical activity
Material.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110767884A (en) * | 2019-09-20 | 2020-02-07 | 曲源 | Inert metal lithium powder with core-shell structure |
| CN111434609A (en) * | 2019-12-27 | 2020-07-21 | 蜂巢能源科技有限公司 | Pre-lithiated negative electrode active material, preparation method thereof, negative plate and lithium ion battery |
| CN112490399A (en) * | 2021-01-27 | 2021-03-12 | 郑州中科新兴产业技术研究院 | Method for pre-lithium of lithium ion battery cathode |
| CN113422007A (en) * | 2021-05-27 | 2021-09-21 | 湖南立方新能源科技有限责任公司 | Method for supplementing lithium to negative electrode, lithium supplementing negative plate and lithium battery |
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| US20080283155A1 (en) * | 2007-05-16 | 2008-11-20 | Fmc Corporation, Lithium Division | Stabilized lithium metal powder for Li-ion application, composition and process |
| CN104393267A (en) * | 2014-10-24 | 2015-03-04 | 上海四驱新能源科技有限公司 | Preparation method of high-stability lithium metal microsphere powder |
| CN108176859A (en) * | 2017-12-05 | 2018-06-19 | 天齐锂业股份有限公司 | The preparation method of passivation of lithium powder |
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| US20080283155A1 (en) * | 2007-05-16 | 2008-11-20 | Fmc Corporation, Lithium Division | Stabilized lithium metal powder for Li-ion application, composition and process |
| CN104393267A (en) * | 2014-10-24 | 2015-03-04 | 上海四驱新能源科技有限公司 | Preparation method of high-stability lithium metal microsphere powder |
| CN108176859A (en) * | 2017-12-05 | 2018-06-19 | 天齐锂业股份有限公司 | The preparation method of passivation of lithium powder |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110767884A (en) * | 2019-09-20 | 2020-02-07 | 曲源 | Inert metal lithium powder with core-shell structure |
| CN111434609A (en) * | 2019-12-27 | 2020-07-21 | 蜂巢能源科技有限公司 | Pre-lithiated negative electrode active material, preparation method thereof, negative plate and lithium ion battery |
| CN112490399A (en) * | 2021-01-27 | 2021-03-12 | 郑州中科新兴产业技术研究院 | Method for pre-lithium of lithium ion battery cathode |
| CN113422007A (en) * | 2021-05-27 | 2021-09-21 | 湖南立方新能源科技有限责任公司 | Method for supplementing lithium to negative electrode, lithium supplementing negative plate and lithium battery |
| CN113422007B (en) * | 2021-05-27 | 2022-12-23 | 湖南立方新能源科技有限责任公司 | Method for supplementing lithium to negative electrode, lithium supplementing negative plate and lithium battery |
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