CN109148820A - A kind of preparation method and its high-energy density soft bag lithium ionic cell of thickness pole piece - Google Patents
A kind of preparation method and its high-energy density soft bag lithium ionic cell of thickness pole piece Download PDFInfo
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
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- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a kind of preparation method of thick pole piece and use the high-energy density soft-package battery of the pole piece.Preparation method includes homogenate, coating, roll-in, cross cutting, drying, lamination, tab welding, encapsulation, battery core drying, fluid injection, chemical conversion, wherein anode two-sided surface density 45-70mg/cm2, the two-sided surface density 20-35mg/cm of cathode2, and according to positive surface density demand, cathode surface density is adjusted, so that cathode face amount/anode face amount, which is more than or equal to 1.0, is less than or equal to 1.2；In 22.4%-37.5%, cathode porosity is controlled in 27.6%-32.2% for positive porosity control；According to compacted density, battery core reservoir quantity is 1.75-2.5g/Ah；Battery formation includes three steps such as constant-current charge-constant-voltage charge-constant-current discharge, and constant-current charge multiplying power is 0.04-0.06C, and constant-voltage charge to cut-off current is 0.01-0.02C after charging to blanking voltage U1；Constant current 0.04-0.06C multiplying power discharging is to blanking voltage U2.Thickness pole piece production method disclosed in this invention is succinct, effect is good, can be mass, and can effectively improve the energy density of monomer lithium ion battery.
Description
Technical field
The present invention relates to the preparation sides that a kind of nickel cobalt lithium aluminate is anode, the thick pole piece that silicon/carbon (or silicon oxygen/carbon) is cathode
The preparation of method and its high-energy density soft bag lithium ionic cell.
Background technique
As the environmental pollution of vehicle exhaust bring and petroleum resources are increasingly severe the problems such as petering out, so that
New-energy automobile becomes the dominant direction of development of automobile, and therefore, the core component lithium ion battery as new-energy automobile becomes
The hot spot of industry research.Therefore lithium ion battery has also attracted more concerns, in order to improve the cruising ability of electric car, more
Good serves user, and the lithium ion battery for developing high-energy-density becomes the inexorable trend of future development.
Currently, countries in the world are all being increased to the investment of Study on Li-ion batteries, and to the electrode material of battery, every
The various aspects such as film, electrolyte are studied, and purpose is all energy density, the power density, safety for improving lithium ion battery
With the service life etc..Although electrode material, electrolyte and diaphragm etc. have significant role to the raising of battery energy density, full electricity
The manufacture craft in pond is also to improve the essential a part of battery specific energy.The preparation of slurry and pole piece during the experiment
Design, to improve battery specific energy it is most important.In the manufacturing process of pole piece, increase pole piece thickness, reduces monomer electricity
The dosage of pond collector plays an important role to the monomer energy density for improving battery.The later period is made in battery, to each battery electricity
The injection rate of solution liquid has strict demand, and either excessive or insufficient, specific capacity and cycle performance to battery can all produce
Raw larger impact.Therefore, the technological design of battery is to the specific energy of raising battery, cruising ability all right and wrong of increase electric car
It is often important.
Since cruising ability of the electric car to battery requires very high, the monomer energy density of raising battery extremely pass
It is important, it develops thick pole piece and the lithium ion battery of exploitation high-energy density is had a very important significance.
Summary of the invention
The present invention is the preparation method that a kind of nickel cobalt lithium aluminate is anode, the thick pole piece that silicon/carbon (or silicon oxygen/carbon) is cathode
And its preparation of high-energy density soft bag lithium ionic cell.
To achieve the goals above, it is described that technical scheme is as follows:
A kind of lithium ion battery of high-energy density includes that anode, cathode, diaphragm, electrolyte, encapsulating material form；It is described
In thick pole piece by mixing optimization, be coated with dry optimization, roll-in optimization, fluid injection optimize and reach higher specific energy.
The positive active material accounts for the 94%-98% of mixing material, preferably 96%-97%；Negative electrode active material accounts for
The 92%-97% of mixing material, preferably 94.5%-95.5%.
The pole piece face amount, positive surface density are 45-70mg/cm2, preferably 55-68mg/cm2；Cathode surface density is
20-35mg/cm2, preferably 23-29mg/cm2；Cathode face amount/anode face amount (NP ratio) is between 1.0-1.2, preferably
1.05-1.18。
The anode and cathode slurry preparation method, sequentially adds solvent and material, when each mixing process vacuum mixed at high speed
Between 1-3h, preferably after 1.5-2h；Linear velocity 0.47-0.6m/s is turned in mixed at high speed stirring, preferably rear 0.53-0.57m/s；High speed point
Disk linear velocity 10.05-11.94m/s is dissipated, preferably rear 11.0-11.6m/s；Viscosity range 2000-10000cP, preferably rear 3500-
7500cP.Negative electrode slurry preparation method sequentially adds solvent and material, each vacuum mixed at high speed time 1-3h, preferably rear 1-
1.5h；Linear velocity 0.47-0.57m/s is turned in mixed at high speed stirring, preferably rear 0.52-0.55m/s；High speed dispersion dish speed 10.05-
11.94m/s, preferably rear 10.37-11.0m/s；Viscosity range 2000-8000cP, preferably rear 3000-6000cP.
The pole coating condition, anode coating: three section oven temperatures are respectively 60-100 DEG C, 80-120 DEG C, 80-110
DEG C, it is preferably afterwards respectively 85-90 DEG C, 100-110 DEG C, 90-100 DEG C；Coating speed 1-3m/s, preferably rear 1.5-2.2m/s；It is negative
Pole coating: three section oven temperatures are respectively 60-95 DEG C, 80-110 DEG C, 80-100 DEG C, are preferably afterwards respectively 75-85 DEG C, 90-100
℃,85-95℃；Coating speed 1.5-4m/s, preferably rear 1.8-2.5m/s.
The pole piece compaction density carries out roll-in to the pole piece that coating is completed, while controlling the compacted density of pole piece；Anode
Compacted density 2.5-3.7g/cm3 is preferably 2.9-3.6g/cm3, porosity 10%-46%, preferably rear 22.4%- afterwards
37.5%；Cathode compacted density 1.4-1.7g/cm3, preferably afterwards be 1.47-1.57g/cm3, porosity 20%-40%, preferably after
For 27.6%-32.2%.
The battery liquid-filling amount and electrolyte wetting method, can have part dead volume, according to electricity in soft-package battery
Tankage and porosity carry out fluid injection, injecting electrolytic solution amount 1.5-3.0g/Ah, preferably rear 1.75-2.25g/Ah to battery；Electrolysis
After liquid injection, vacuum immersion is carried out, vacuum degree-(90-95) kPa keeps 1-5min, recycles 3-5 times, preferably rear retention time 2-
3min is recycled 3 times.
The high energy density cells chemical synthesizing method is stood for 24 hours, battery is with 0.02-0.07C constant current after the completion of fluid injection
Blanking voltage U1 is charged to, charges to cut-off current 0.01-0.02C, U1=4.0-4.4V in constant pressure U1；10min is stood, with
0.02-0.07C constant-current discharge is to blanking voltage U2, U2=2.5-3.2V；After it is preferred that, charging and discharging currents 0.04-0.06C, charging
Blanking voltage 4.2-4.3V, discharge cut-off voltage 2.7-3.0V.
Detailed description of the invention
Fig. 1 coating apparatus and coating flow.
Fig. 2 pole piece roll-in schematic diagram.
Fig. 3 soft-package battery disassembly diagram.
Specific embodiment
The present invention is illustrated technical solution of the present invention with following comparative example and embodiment, but the present invention not only limits to
In following comparative example and embodiment, protection scope of the present invention is subject to claims.
Comparative example 1
Anode sizing agent preparation: by active material nickel cobalt lithium aluminate (NCA), conductive agent (SP) and binder polyvinylidene fluoride
(PVDF) it is mixed according to the ratio of weight 97:1:2；Appropriate solvent N-methyl pyrilidone (NMP) is added in batch mixer, passes through height
Binder is dissolved in solvent and then sequentially adds conductive agent and active material by fast peptizaiton, is made by stirring and high speed dispersion
It must be completely dissolved in solvent and form the stable and uniform fluid with certain viscosity, viscosity 3500cP is stirred in whipping process
It mixes and turns linear velocity 0.53m/s, disperse drum speed 11.0m/s.
Negative electrode slurry preparation: by active material silicon-carbon (Si/C), conductive agent (SP), binder carboxymethyl cellulose (CMC), fourth
Benzene rubber (SBR) and polyacrylic acid (PAA) prepare cathode according to the ratio of 94.5:1:1.5:1.5:1.5 and starch；It is added a certain amount of
Then water sequentially adds conductive agent and active material so that CMC is dissolved in water as solvent, PAA and SBR is eventually adding, by stirring
High speed dispersion effect is mixed and stirred, the stable and uniform fluid with certain viscosity is formed, viscosity 3000cP is stirred in mixing process
Mixing and turning linear velocity is 0.47m/s, dispersion impeller linear velocity 10.37m/s.
Coating: 1) positive electrode prepared by coating apparatus is coated onto aluminium foil on, aluminum foil thickness 12um, by baking oven
Drying, three section oven temperatures are respectively 85 DEG C, 100 DEG C, 90 DEG C, coating speed 2.2m/s；The two-sided surface density of anode pole piece is
55mg/cm2, it is anode pole piece after drying.2) slurry is coated onto copper foil by cathode coating machine by the negative electrode slurry prepared
On material, copper thickness 8um, the two-sided surface density of cathode pole piece is 23mg/cm2, dried by three section baking ovens, three section oven temperatures
Respectively 75 DEG C, 90 DEG C, 85 DEG C, coating speed 2.5m/s, as cathode pole piece.
Roll-in cross cutting, larger without the pole piece porosity of roll-in, compacted density does not reach requirement, and can generally pass through roller
Pressure, is then die cut；Positive compacted density 2.9g/cm3, cathode compacted density: 1.47g/cm3.Pole piece cross cutting, generally cuts just
Pole piece every side in pole is slightly less than cathode pole piece 2mm, and pole piece length and width generally make according to demand, and anode is taken in this experiment: 58 ×
108mm, cathode: 62 × 112mm.Pole piece is dry, program setting temperature: 90 DEG C；Classification vacuum drying, vacuum degree: -90kPa is done
The dry time: 5h is recycled 2 times.
Lamination: machine lamination, when parameter is arranged, the piece number is odd number, and how a piece of cathode is, and outermost cathode pole piece is two-sided
Pole piece.
Tab welding: cutting cell polar ear, and the tab alignment cell polar ear containing heat-seal adhesive is welded, is welded
Time: 0.06s；After tab is welded, welding position is bonded with high temperature gummed tape, preventing tab burn into from falling off leads to short circuit
Or open circuit.
Aluminum plastic film encapsulation, battery core is placed into the aluminum plastic film of punching press certain depth, is carried out the warm closedtop of heat, is prevented battery core position
Variation is set, side seal and secondary closedtop are then carried out.
Battery core is dry, program setting: 90 DEG C of temperature, vacuum degree: (gas of being taken a breath after -90kPa, drying time 5h
For dry nitrogen or argon gas), cycle-index: 10 times.
Battery core fluid injection when battery core temperature drops to 25-40 DEG C, can be put into glove box and carry out fluid injection, according to obtained by experimental data,
Electrolyte injection rate 2.5g/Ah.Vacuum immersion, vacuum degree -90kPa keep 3min, recycle 3 times.Battery side port is used after the completion
Sealing machine is sealed.
Aging chemical conversion, battery is aged under isoperibol after fluid injection, and temperature controls 25 DEG C, the time 1 day.It is melted into item
Part: 0.04 charges to blanking voltage 4.2V；Constant pressure 4.2V charges to cut-off current 0.01C；0.04C electric discharge, blanking voltage 2.7V；
Circulation 2 times.Then degasification, two envelopes are carried out to battery.
Partial volume tests monomer energy density of the full battery under 0.1C, 0.2C, 0.5C multiplying power.
Battery single physical efficiency metric density under different multiplying is respectively as follows: 285.5Wh/kg, 278.8Wh/kg, 267Wh/kg.
Comparative example 2
The two-sided surface density 30mg/cm of anode2, the two-sided surface density 13mg/cm of cathode2。
Other are consistent with comparative example 1.
Battery single physical efficiency metric density under different multiplying is respectively as follows: 200Wh/kg, 189Wh/kg, 179.8Wh/kg.
Embodiment 1
Positive mixing step mixing speed is replaced, it is 0.57m/s, dispersion impeller linear velocity 11.62m/ that linear velocity is turned in stirring
s；Linear velocity 0.55m/s, dispersion impeller linear velocity 11.0m/s are turned in the replacement of cathode mixing mixing speed, stirring；Viscosity is respectively
7500cP、6000cP。
It is respectively 90 DEG C, 110 DEG C, 100 DEG C, coating speed 2.2m/s that anode pole piece, which is coated with three section oven temperatures,；Cathode applies
Three section baking oven of cloth is respectively 85 DEG C, 100 DEG C, 90 DEG C, coating speed 2.5m/s.
Other are consistent with comparative example 1.
Battery single physical efficiency metric density under different multiplying is respectively as follows: 284.1Wh/kg, 277.4Wh/kg, 266.8Wh/kg.
Embodiment 2
Positive electrode ratio is changed to 96%, i.e. NCA:SP:PVDF=96:1.5:2.5, negative electrode material is changed to
95.5, i.e. Si/C:SP:CMC:PAA:SBR=95.5:1:1.5:1:1.
The two-sided face amount 68mg/cm of anode2, the two-sided face amount 29mg/cm of cathode2。
Positive coating speed 1.5m/s, cathode coating speed 1.8m/s.
Other are consistent with comparative example 1.
Battery single physical efficiency metric density under different multiplying is respectively as follows: 284Wh/kg, 277Wh/kg, 265.5Wh/kg.
Embodiment 3
Anode pole piece compacted density is become into 3.6g/cm3, cathode compacted density become 1.57g/cm3。
Battery liquid-filling quantitative change is 1.75g/Ah.
Chemical conversion charging and discharging currents become 0.06C, charge cutoff voltage 4.3V, constant pressure cut-off current 0.02C, electric discharge cut-off electricity
Press 3.0V.
Other are consistent with comparative example 1.
Battery single physical efficiency metric density under different multiplying is respectively as follows: 279.4Wh/kg, 271.9Wh/kg, 259.6Wh/kg.
Embodiment 4
Positive electrode ratio is changed to 96%, i.e. NCA:SP:PVDF=96:1.5:2.5, negative electrode material is changed to
95.5, i.e. Si/C:SP:CMC:PAA:SBR=95.5:1:1.5:1:1.
The two-sided face amount 68mg/cm of anode2, the two-sided face amount 29mg/cm of cathode2。
Other are consistent with embodiment 1.
Battery single physical efficiency metric density under different multiplying is respectively as follows: 266Wh/kg, 259.5Wh/kg, 248.3Wh/kg.
Embodiment 5
Anode pole piece compacted density is become into 3.6g/cm3, cathode compacted density become 1.57g/cm3。
Battery liquid-filling quantitative change is 1.75g/Ah.
Chemical conversion charging and discharging currents become 0.06C, charge cutoff voltage 4.25V, constant pressure cut-off current 0.02C, electric discharge cut-off
Voltage 2.75V.
Other are consistent with embodiment 1.
Battery single physical efficiency metric density under different multiplying is respectively as follows: 287.5Wh/kg, 281.1Wh/kg, 270Wh/kg.
Embodiment 6
Anode pole piece compacted density is become into 3.6g/cm3, cathode compacted density become 1.57g/cm3。
Battery liquid-filling quantitative change is 1.75g/Ah.
Chemical conversion charging and discharging currents become 0.06C, charge cutoff voltage 4.3V, constant pressure cut-off current 0.02C, electric discharge cut-off electricity
Press 3.0V.
Other are consistent with embodiment 2.
Battery single physical efficiency metric density under different multiplying is respectively as follows: 275.4Wh/kg, 268.6Wh/kg, 258.2Wh/kg.
It can be seen that battery after chemical conversion from the above comparative example and being compared to each other for embodiment, to different times of battery
Energy density under rate is compared, and is obtained: 1, the monomer energy density of thick pole piece soft-package battery is greater than the monomer energy of thin pole piece
Metric density；2, appropriate electrolyte has certain influence for promoting battery cell energy density；3, for coating, drying temperature influences
Larger, suitable drying temperature facilitates the quick Fabrication of pole piece, and has certain influence to later period battery energy density；4,
The high rate performance of the Porosity Rate Influence battery of pole piece, therefore compacted density is most important.In conclusion right portion in this patent
Point, there is more significant positive effect for promoting battery energy density.
The Applicant declares that the present invention illustrates detailed process equipment and work of the invention by above-mentioned comparative example and embodiment
Skill process, but the invention is not limited to above-mentioned process equipments and process flow to implement.Those of skill in the art
Member is it will be clearly understood that any improvement in the present invention, the addition of equivalence replacement and auxiliary element to each raw material of product of the present invention, tool
The selection etc. of body mode, all of which fall within the scope of protection and disclosure of the present invention.
Claims (7)
1. a kind of preparation method of the soft-package battery of thickness pole piece, it is characterised in that: the following steps are included: 1) anode and cathode slurry system
It is standby；2) coating process；3) pole piece roll-in.
2. the preparation method of the soft-package battery of thickness pole piece according to claim 1, it is characterised in that: described in step 1)
The preparation of anode sizing agent, anode include active material nickel cobalt lithium aluminate (NCA), and conductive agent, binder, wherein active material accounts for material
Expect the 94%-98% of gross mass；Cathode includes active material silicon-carbon (Si/C), and conductive agent, binder, wherein it is total to account for material for active material
The 92%-97% of quality；
Specifically, the following steps are included:
Anode sizing agent composition:
Nickel cobalt lithium aluminate (NCA): 94-98%
Conductive agent Super-P (SP): 0.5-2%
Kynoar (PVDF): 1.5-4%
Material is weighed in proportion and is dried in vacuo 10h, and binder PVDF, conductive agent SP, active material NCA are successively dissolved in N- methyl
In pyrrolidones (NMP) solvent；Whole process premixes vacuum mixed at high speed after 10min, mixing when being put into different materials every time
Time 1-3h；Linear velocity 0.19-0.31m/s, dispersion impeller linear velocity 0.63-1.26m/s are turned in premix stirring；Mixed at high speed stirring is turned
Linear velocity 0.47-0.57m/s, dispersion impeller linear velocity 10.05-11.94m/s；Eventually form the stable and uniform with certain viscosity
Fluid, viscosity range 2000-10000cP.
Negative electrode slurry preparation:
Negative electrode slurry formula:
Silicon/carbon (Si/C): 92-96%
Conductive agent Super-P:0.5-2%
Carboxymethyl cellulose (CMC): 0.5-3%
Polyacrylic acid (PAA): 0.5-3%
Butadiene-styrene rubber (SBR): 0.5-3%
Proportionally weigh material and dry 10h, then successively binder (CMC), conductive agent (SP), active material (Si/C),
Binder (PAA and SBR) is dissolved in deionized water；Different materials are added in whole process every time, premix mixed at high speed 1- after 10min
Linear velocity 0.19-0.31m/s, dispersion impeller linear velocity 0.63-1.26m/s are turned in 3h, premix stirring；Linear velocity is turned in mixed at high speed stirring
0.47-0.57m/s, dispersion impeller linear velocity 10.05-11.94m/s；The stable and uniform fluid with certain viscosity is eventually formed, is sticked
Spend range 2000-8000cP.
3. the preparation method of thickness pole piece soft-package battery according to claim 1, it is characterised in that: in step 2), according to reality
Test the two-sided surface density 45-70mg/cm of requirement design anode2, the two-sided surface density 20-35mg/cm of cathode2, cathode face amount/anode
Face amount (NP ratio) is more than or equal to 1.0 and is less than or equal to 1.2；In coating process, aluminium foil or copper foil are placed, then filtering
Slurry is transferred to coater head afterwards；Pole piece face amount is designed according to requirement of experiment, adjusts surface density needed for being coated with；Then control is dried
Box temperature degree, anode three section baking ovens of coating, first segment temperature: 60-100 DEG C；Second section temperature: 80-120 DEG C；Third section temperature:
80-110 DEG C, coating speed 1-3m/s；Cathode is coated with three section baking ovens, first segment temperature: 60-95 DEG C；Second section temperature: 80-110
℃；Third section temperature: 80-100 DEG C, coating speed 1.5-4m/s.
4. the preparation method of thickness pole piece soft-package battery according to claim 1, it is characterised in that: in step 3), to coating
The pole piece of completion carries out roll-in, positive compacted density 2.5-3.7g/cm3, cathode compacted density 1.4-1.7g/cm3；Positive hole
Rate 21%-46%, cathode porosity 20%-40%.
5. a kind of soft bag lithium ionic cell of high-energy density, using the preparation method of thickness pole piece described in right 1, feature exists
In: include 1) battery liquid-filling；2) Battery formation.
6. the preparation method of thickness pole piece soft-package battery according to claim 5, it is characterised in that: in step 1), thick pole piece
With the presence of dead volume in soft-package battery, electrolyte injection rate is appropriate, battery electrolyte injection rate 1.5-3.0g/Ah.Electrolyte
After injection, be evacuated down to-(90-95) kPa and 1-5min is kept, it recycles 3-5 times.It is sealed, is stood for 24 hours later.
7. the preparation method of thickness pole piece soft-package battery according to claim 5, it is characterised in that: battery in step 2)
It is arranged at program, stands battery 0.02-0.07C constant-current charge for 24 hours to blanking voltage U1, U1=4.0-4.4V；Then with U1
Constant-voltage charge to cut-off current is 0.01-0.02C；10min is stood, with 0.02-0.07C constant-current discharge to blanking voltage U2, U2
=2.5-3.2V；Circulation two weeks.
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Cited By (11)
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| CN113013497A (en) * | 2021-02-26 | 2021-06-22 | 四川长虹电源有限责任公司 | High-power lithium battery and preparation method thereof |
| CN113745646A (en) * | 2021-09-08 | 2021-12-03 | 珠海冠宇电池股份有限公司 | Lithium ion battery of silicon cathode system |
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| CN114864867A (en) * | 2022-04-29 | 2022-08-05 | 蜂巢能源科技股份有限公司 | Positive pole piece of lithium ion battery and preparation method and application thereof |
| CN114864867B (en) * | 2022-04-29 | 2024-03-22 | 蜂巢能源科技股份有限公司 | Positive pole piece of lithium ion battery and preparation method and application thereof |
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| CN114824173A (en) * | 2022-06-10 | 2022-07-29 | 蜂巢能源科技(无锡)有限公司 | Dry electrode pole piece, preparation method thereof and application of dry electrode pole piece in energy storage battery |
| CN115548343A (en) * | 2022-10-20 | 2022-12-30 | 楚能新能源股份有限公司 | Lithium ion battery cathode and preparation method thereof |
| CN115472898B (en) * | 2022-10-27 | 2023-09-15 | 欣旺达动力科技股份有限公司 | Secondary battery and electric equipment |
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| WO2024087388A1 (en) * | 2022-10-27 | 2024-05-02 | 欣旺达动力科技股份有限公司 | Secondary battery and electrical device |
| CN117410494A (en) * | 2023-12-15 | 2024-01-16 | 溧阳中科海钠科技有限责任公司 | Positive electrode plate, preparation method thereof, sodium ion battery and electric equipment |
| CN117410494B (en) * | 2023-12-15 | 2024-03-15 | 溧阳中科海钠科技有限责任公司 | Positive electrode plate, preparation method thereof, sodium ion battery and electric equipment |
| CN117996215A (en) * | 2024-04-07 | 2024-05-07 | 宁德时代新能源科技股份有限公司 | Battery, preparation method thereof and electricity utilization device |
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