CN107565170B - A kind of chemical synthesizing method of lithium ion battery - Google Patents
A kind of chemical synthesizing method of lithium ion battery Download PDFInfo
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- CN107565170B CN107565170B CN201710737395.7A CN201710737395A CN107565170B CN 107565170 B CN107565170 B CN 107565170B CN 201710737395 A CN201710737395 A CN 201710737395A CN 107565170 B CN107565170 B CN 107565170B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The present invention provides a kind of chemical synthesizing methods of lithium ion battery, comprising the following steps: A) after lithium ion battery liquid injection room temperature stand 12~for 24 hours, then stand 8~20h at 40~45 DEG C；B cell voltage) is charged to by 3.5~3.8V with the electric current of 0.01C~0.03C, keeps environment temperature at 5~15 DEG C；C cell voltage) is charged to by 3.8~4.35V with the electric current of 0.03~0.06C, keeps environment temperature at 20~30 DEG C；D cell voltage) is charged to by 4.55~4.65V with the electric current of 0.06~0.15C, then with 4.55~4.65V constant-voltage charge to electric current≤0.02C, keeps environment temperature at 20~30 DEG C；E) high temperature ageing.The present invention can be effectively reduced the internal resistance of battery in the chemical synthesizing method of lithium ion battery, promote the cycle performance of battery, improve the energy density of battery.
Description
Technical field
The invention belongs to technical field of lithium ion more particularly to a kind of chemical synthesizing methods of lithium ion battery.
Background technique
Currently, with electronic product extensive use, the fast development of electric car industry, people continue lithium ion battery
More stringent requirements are proposed for boat ability, and more and more research institutions and battery enterprise start Efforts To Develop higher energy density
The development work of lithium ion battery.
Positive electrode has a conclusive effect to the energy density of lithium ion battery, lithium-rich manganese-based anode material with its compared with
High reality, which can play capacity (250mAh/g or more), becomes the hot spot of current research.The study found that lithium-rich manganese base material
xLi2MnO3·(1-x)LiMO2In initial charge, when charging voltage is higher than 4.5V, Li2MnO3Component is activated, lithium layer and
Lithium in transition metal is deviate from together, and is accompanied by O2Release and form the MnO of stratiform2, will appear on charging curve one it is de-
Lithium with deoxidation platform so that specific capacity is higher than 250mAh/g, when electric discharge, because the vacancy that the abjection of oxygen generates is by transition gold
Belong to cation occupy, make charging when deviate from part lithium ion return it is embedding be hindered, cause irreversible capacity loss for the first time.Separately
On the one hand, at higher voltages, the electrolyte oxidation that may cause decomposes and occurs in the side reaction of negative terminal surface battery,
Lead to battery flatulence, impedance increases.
The cathode application of high capacity can reduce dosage to mitigate the weight and volume of battery, promote energy density.Silicon-carbon
Composite negative pole material have preferable cycle performance, but simultaneously because silicon bulking effect, will cause SEI film in negative terminal surface
The consumption of lithium ion is excessively increased in repeated growth, causes the decline of capacity and cycle life.
The development of high energy density cells needs the lithium-rich manganese base material using high capacity, the graphite material or more into one of arranging in pairs or groups
Step collocation silicon-carbon composite cathode material, but due to the above problem, the anode gram volume made of common chemical synthesizing method
It can not effectively play, specific energy is low, flatulence is serious, internal resistance is big, first charge discharge efficiency is low, high rate performance is poor, poor circulation.
Summary of the invention
The purpose of the present invention is to provide a kind of chemical synthesizing methods of lithium ion battery, are obtained by the chemical synthesizing method in the present invention
Lithium ion battery energy density and first charge discharge efficiency it is high, high rate performance is preferable, internal resistance is small, and can effectively solve the problem that flatulence problem.
The present invention provides a kind of chemical synthesizing method of lithium ion battery, comprising the following steps:
A) lithium ion battery room temperature stand 12~for 24 hours, 8~20h is then stood at 40~45 DEG C；
B cell voltage) is charged to by 3.5~3.8V with the electric current of 0.01C~0.03C, keeps environment temperature at 5~15 DEG C；
C cell voltage) is charged to by 3.8~4.35V with the electric current of 0.03~0.06C, keeps environment temperature at 20~30 DEG C；
D cell voltage) is charged to by 4.55~4.65V with the electric current of 0.06~0.15C, then with 4.55~4.65V constant pressure
Electric current≤0.02C is charged to, keeps environment temperature at 20~30 DEG C；
E) high temperature ageing.
Preferably, the step B)~E) lithium ion battery is placed in high/low temperature vacuum tank, keep degasification air pressure-
0.02MPa~-0.06MPa.
Preferably, the temperature of the high temperature ageing is 40~50 DEG C；
The time of the high temperature ageing is 24~60 hours.
Preferably, the water content before the lithium ion battery liquid injection is not higher than 300ppm.
Preferably, all steps of the chemical synthesizing method carry out in the environment of humidity is lower than 1%.
Preferably, the positive electrode active materials of the lithium ion battery are rich lithium manganese base solid solution material.
Preferably, the positive electrode active materials of the lithium ion battery are xLi2MnO3·(1-x)LiMO2, wherein 0 < x < 1,
M is one of Ni, Mn, Co, Ti, Cr, Al, Fe and Mg or a variety of.
Preferably, the negative electrode active material of the lithium ion battery is Si-C composite material or graphite material.
Preferably, in the Si-C composite material, the mass fraction of silicon is 5~40%.
The present invention provides a kind of chemical synthesizing methods of lithium ion battery, comprising the following steps: A) after lithium ion battery liquid injection
Room temperature stands 12~for 24 hours, 8~20h is then stood at 40~45 DEG C；B) cell voltage is charged to the electric current of 0.01C~0.03C
3.5~3.8V keeps environment temperature at 5~15 DEG C；C cell voltage) is charged to by 3.8~4.3V with the electric current of 0.03~0.06C,
Keep environment temperature at 20~30 DEG C；D cell voltage) is charged to by 4.55~4.65V with the electric current of 0.06~0.15C, then with
4.55~4.65V constant-voltage charge keeps environment temperature at 20~30 DEG C to electric current≤0.02C；E) high temperature ageing.The present invention is in lithium
The chemical conversion of ion battery each stage takes different multiplying to charge, and can more preferably promote the formation of each stage SEI film of negative terminal surface, fill
Electric early period reduces environment temperature, be more conducive to be formed it is fine and close, uniformly, the SEI film of flexible, avoid electrolyte and positive and negative anodes after
Continuous reaction, effectively reduces the internal resistance of battery, promotes the cycle performance of battery.Meanwhile setting charge cutoff voltage 4.55~
4.65V, the activation under high voltage are more conducive to the abundant abjection of lithium-rich manganese base material interlayer lithium, enable lithium-rich manganese base material
Higher capacity is played, to improve the energy density of battery.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the chemical conversion flow chart of lithium ion battery of the present invention；
Fig. 2 is the cycle life curve of the lithium ion battery after being melted into the embodiment of the present invention 1~3 and comparative example 1~3.
Specific embodiment
The present invention provides a kind of chemical synthesizing method of lithium ion battery, comprising the following steps:
A) after lithium ion battery liquid injection room temperature stand 12~for 24 hours, 8~20h is then stood at 40~45 DEG C；
B cell voltage) is charged to by 3.5~3.8V with the electric current of 0.01C~0.03C, keeps environment temperature at 5~15 DEG C；
C cell voltage) is charged to by 3.8~4.35V with the electric current of 0.03~0.06C, keeps environment temperature at 20~30 DEG C；
D cell voltage) is charged to by 4.55~4.65V with the electric current of 0.06~0.15C, then with 4.55~4.65V constant pressure
Electric current≤0.02C is charged to, keeps environment temperature at 20~30 DEG C；
E) high temperature ageing.
In the present invention, the positive electrode active materials of the lithium ion battery are preferably lithium-rich manganese base material, more preferably
xLi2MnO3·(1-x)LiMO2, wherein 0 < x < 1, one of M Ni, Mn, Co, Ti, Cr, Al, Fe and Mg or a variety of, tool
Body, in an embodiment of the present invention, it can be 0.3Li2MnO3·0.7LiNiCoMnO2、0.5Li2MnO3·
0.5LiNiCoMnO2Or 0.7Li2MnO3·0.3LiNiCoMnO2。
The present invention limitation not special to the anode, using above-mentioned lithium-rich manganese base material as active material, then with
Anode is prepared in other conventional cathode materials.It such as, can be according to lithium-rich manganese base material: conductive black: electrically conductive graphite: poly-
Vinylidene fluoride=96:1.5:0.5:2 mass ratio, polyvinylidene fluoride is dissolved in N-Methyl pyrrolidone solvent and is configured to
Then electrically conductive graphite and conductive black is added in 8% glue, lithium-rich manganese base material is added after dispersing completely, until slurry mixes
It is uniformly dispersed, N-Methyl pyrrolidone is added and adjusts viscosity to 5000~8000cp, then uniformly applies the slurry mixed
For cloth on the aluminium foil with a thickness of 15 μm, being coated with two-sided surface density is 36mg/cm2, and roll-in cuts to obtain positive plate.
In the present invention, the negative electrode active material of the lithium ion battery is preferably Si-C composite material or graphite material,
In the Si-C composite material, the mass fraction of silicon is preferably 5~40%.Specifically, can be 15%, 7% or 12%.
The present invention does not have special limitation to the cathode, using above-mentioned negative electrode active material, then with other conventional anodes
Cathode is prepared in material.Such as according to negative electrode active material: conductive black: electrically conductive graphite: sodium carboxymethylcellulose: butylbenzene
Rubber=95:1.5:1.5:2 mass ratio；Thickener sodium carboxymethylcellulose is dissolved in deionized water and is configured to 2.5%
Then glue is added conductive black, negative electrode active material is repeatedly added after dispersion completely in batches, binder is added after mixing
SBR emulsion adds water to adjust viscosity to 2000~4000cp, then the slurry mixed is uniformly coated on a thickness of 8
μm copper foil on, coated face density is calculated with corresponding to positive electrode capacity excessive 4%, and roll-in cuts to obtain negative electrode tab.
For the present invention using lithium-rich manganese-based as positive electrode, Si-C composite material, one kind of graphite or mixing are used as cathode material
Material, the lithium ion battery of production, the setting value of N/P are 1.02~1.08, and it is more reasonable to design, lithium-rich manganese base material capacity hair
Wave it is higher, energy density be not less than 250Wh/kg.
110 DEG C of vacuum drying 12h of positive/negative plate, soldering polar ear are entered plastic-aluminum shell after winding together with diaphragm by the present invention
Encapsulation, high pressure resistant electrolyte is injected after 80 DEG C of high-temperature baking 12h, obtains lithium ion battery.
As shown in FIG. 1, FIG. 1 is the chemical conversion flow charts of lithium ion battery of the present invention for chemical conversion process in the present invention: embodying
At steps are as follows,
A) lithium ion battery room temperature stand 12~for 24 hours, 8~20h is then stood at 40~45 DEG C；
Then lithium ion battery is placed in high/low temperature vacuum tank, keeps degasification air pressure -0.02MPa~-0.06MPa, it is excellent
It is selected as -0.04MPa.
B cell voltage) is charged to by 3.5~3.8V with the electric current of 0.01C~0.03C, keeps environment temperature at 5~15 DEG C；
C cell voltage) is charged to by 3.8~4.35V with the electric current of 0.03~0.06C, keeps environment temperature at 20~30 DEG C；
D cell voltage) is charged to by 4.55~4.65V with the electric current of 0.06~0.15C, then with 4.55~4.65V constant pressure
Electric current≤0.02C is charged to, keeps environment temperature at 20~30 DEG C；
E) high temperature ageing.
After high temperature ageing, battery is taken out from vacuum tank, sealing, degasification are evacuated on degassing apparatus
Air pressure≤- 0.09MPa.
Step A) in room temperature stand time be preferably 18~24 hours, it is small preferably to stand 12~18 under 40~45 DEG C of high temperature
When.
Step B) in charging current be preferably 0.02C；It is preferred that voltage is charged to 3.7~3.8V；Preferably remain high/low temperature
The environment temperature of vacuum tank is 10~15 DEG C.
Step C) in charging current be preferably 0.04~0.05C；It is preferred that voltage is charged to 4.1~4.35V；It preferably remains
The environment temperature of high/low temperature vacuum tank is 25 DEG C.
Step D) in charging current be preferably 0.1~0.15C；It is preferred that voltage is charged to 4.6V；Preferably remain high/low temperature
The environment temperature of vacuum tank is 25 DEG C.
In the present invention, the temperature of the high temperature ageing is preferably 40~50 DEG C, and more preferably 45 DEG C；The high temperature ageing
Time be preferably 24~60 hours, more preferably 48 hours.
Compared with prior art, the invention has the following advantages:
(1) using lithium-rich manganese-based as positive electrode, Si-C composite material, one kind of graphite or mixing are used as negative electrode material,
The lithium ion battery of production, N/P design is more reasonable, and the performance of lithium-rich manganese base material capacity is higher, and energy density is not less than
250Wh/kg；
(2) pass through quiescence in high temperature before battery charging, when can make battery that there is better effect of impregnation, and shorten infiltration
Between；
(3) in chemical conversion overall process, inside battery is maintained at negative pressure state, can guarantee positive/negative plate during the charging process
And diaphragm is in close contact, the gas of generation can quickly be discharged, to reduce battery impedance, effectively avoid bearing caused by because of gas
The performance of positive electrode capacity is improved in pole blackspot, dead zone etc., promotes the first charge discharge efficiency of battery.
(4) chemical conversion each stage takes different multiplying to charge, and can more preferably promote the formation of each stage SEI film of negative terminal surface,
Charging reduces environment temperature early period, be more conducive to be formed it is fine and close, uniformly, the SEI film of flexible, avoid electrolyte and positive and negative anodes
The reaction was continued, effectively reduces the internal resistance of battery, promotes the cycle performance of battery.
(5) charge cutoff voltage 4.55-4.65V, the activation under high voltage are more conducive to lithium-rich manganese base material interlayer lithium
Sufficiently abjection, enables lithium-rich manganese base material to play higher capacity, to improve the energy density of battery.
(6) control of battery moisture content is within 300ppm, and ambient humidity controls within 1%, it is possible to prevente effectively from electric
Pond is reacted with water during the charging process, is led to electrolyte decomposition flatulence, is influenced the first charge discharge efficiency and capacity of battery.
In order to further illustrate the present invention, with reference to embodiments to a kind of chemical conversion of lithium ion battery provided by the invention
Method is described in detail, but cannot be understood as limiting the scope of the present invention.
Embodiment 1
Lithium ion battery provided in this embodiment, production method are as follows:
Positive mass ratio are as follows: lithium-rich manganese base material: conductive black: electrically conductive graphite: polyvinylidene fluoride=96:1.5:0.5:
2；Polyvinylidene fluoride is dissolved in be configured in N-Methyl pyrrolidone solvent 8% glue, be then added and electrically conductive graphite and lead
Lithium-rich manganese base material is added after dispersing completely in electric carbon black, until slurry mixing is uniformly dispersed, N-Methyl pyrrolidone is added and adjusts
Then the slurry mixed is uniformly coated on the aluminium foil with a thickness of 15 μm, is coated with two-sided to 5000~8000cp by viscosity
Surface density is 36mg/cm2, and roll-in cuts to obtain positive plate.
Cathode mass ratio are as follows: Si-C composite material (ratio of silicon is 15%): conductive black: electrically conductive graphite: carboxymethyl is fine
Tie up plain sodium: butadiene-styrene rubber=95:1.5:1.5:2；Thickener sodium carboxymethylcellulose is dissolved in deionized water and is configured to 2.5%
Glue, be then added conductive black, Si-C composite material (ratio of silicon is 15%) be repeatedly added after dispersion completely in batches, mixes
Binder SBR emulsion is added after closing uniformly, adds water adjusting viscosity to 2000~4000cp, the slurry that then will be mixed
It is uniformly coated on the copper foil with a thickness of 8 μm, coated face density is calculated with corresponding to positive electrode capacity excessive 4%, and roll-in is cut
Obtain negative electrode tab.
By 110 DEG C of vacuum drying 12h of positive/negative plate, soldering polar ear, and enter the encapsulation of plastic-aluminum shell, warp after winding together with diaphragm
High pressure resistant electrolyte is injected after 80 DEG C of high-temperature baking 12h.
Battery formation process are as follows:
It seals, is stood under room temperature for 24 hours after battery liquid-filling, stand 12h at 45 DEG C of high temperature；
Battery is placed in high/low temperature vacuum tank, degasification air pressure -0.04mPa is kept；
Cell voltage is charged to 3.7V with the electric current of 0.02C, keeps vacuum tank temperature at 15 DEG C；
Cell voltage is charged to 4.35V with the electric current of 0.05C, keeps vacuum tank environment temperature at 25 DEG C；
Cell voltage is charged to 4.6V with the electric current of 0.15C, then with 4.6V constant-voltage charge to electric current≤0.02C, is kept
Vacuum tank environment temperature is at 25 DEG C；
Vacuum tank temperature is adjusted to 45 DEG C of progress high temperature ageings, battery is taken out after 48h, vacuum is carried out on degassing apparatus
Pumping sealing, degasification air pressure≤- 0.09mPa；
Water content≤300ppm of battery battery core before fluid injection in above-mentioned steps, above-mentioned all formation processes are in environmental wet
It is carried out under conditions of spending less than 1%.
First charge discharge efficiency is detected respectively to battery after aging, internal resistance, capacity, energy density, multiplying power, cycle performance items refer to
Mark.The results are shown in Table 1.
Embodiment 2
Lithium ion battery provided in this embodiment, production method are as follows:
Positive plate production is identical with embodiment 1.
Cathode mass ratio are as follows: Si-C composite material: conductive black: electrically conductive graphite: sodium carboxymethylcellulose: butadiene-styrene rubber=
95:1.5:1.5:2；Thickener sodium carboxymethylcellulose is dissolved in be configured in deionized water 2.5% glue, then be added lead
Si-C composite material (ratio of silicon is 7%) is repeatedly added in batches, binder is added after mixing for electric carbon black after dispersion completely
SBR emulsion adds water to adjust viscosity to 2000~4000cp, then the slurry mixed is uniformly coated on a thickness of 8
μm copper foil on, coated face density is calculated with corresponding to positive electrode capacity excessive 4%, and roll-in cuts to obtain negative electrode tab.
By 110 DEG C of vacuum drying 12h of positive/negative plate, soldering polar ear, and enter the encapsulation of plastic-aluminum shell, warp after winding together with diaphragm
High pressure resistant electrolyte is injected after 80 DEG C of high-temperature baking 12h.
Battery formation process are as follows:
It seals, is stood under room temperature for 24 hours after battery liquid-filling, stand 12h at 45 DEG C of high temperature；
Battery is placed in high/low temperature vacuum tank, degasification air pressure -0.04mPa is kept；
Cell voltage is charged to 3.8V with the electric current of 0.02C, keeps vacuum tank temperature at 15 DEG C；
Cell voltage is charged to 4.3V with the electric current of 0.05C, keeps vacuum tank environment temperature at 25 DEG C；
Cell voltage is charged to 4.6V with the electric current of 0.15C, then with 4.6V constant-voltage charge to electric current≤0.02C, is kept
Vacuum tank environment temperature is at 25 DEG C；
Vacuum tank temperature is adjusted to 45 DEG C of progress high temperature ageings, battery is taken out after 48h, vacuum is carried out on degassing apparatus
Pumping sealing, degasification air pressure≤- 0.09mPa；
Water content≤300ppm of battery battery core before fluid injection in above-mentioned steps, above-mentioned all formation processes are in environmental wet
It is carried out under conditions of spending less than 1%.
First charge discharge efficiency is detected respectively to battery after aging, internal resistance, capacity, energy density, multiplying power, cycle performance items refer to
Mark.The results are shown in Table 1.
Embodiment 3
Lithium ion battery provided in this embodiment, production method are as follows:
Positive plate production is identical with embodiment 1.
Cathode mass ratio are as follows: artificial graphite material: conductive black: electrically conductive graphite: sodium carboxymethylcellulose: butadiene-styrene rubber=
95:1.5:1.5:2；Thickener sodium carboxymethylcellulose is dissolved in be configured in deionized water 2.5% glue, then be added lead
Artificial graphite is repeatedly added in electric carbon black in batches after dispersion completely, binder SBR emulsion is added after mixing, adds water tune
Viscosity is saved to 2000~4000cp, then the slurry mixed is uniformly coated on the copper foil with a thickness of 8 μm, coated face is close
Degree is calculated with corresponding to positive electrode capacity excessive 8%, and roll-in cuts to obtain negative electrode tab.
By 110 DEG C of vacuum drying 12h of positive/negative plate, soldering polar ear, and enter the encapsulation of plastic-aluminum shell, warp after winding together with diaphragm
High pressure resistant electrolyte is injected after 80 DEG C of high-temperature baking 12h.
Battery formation process are as follows:
It seals, is stood under room temperature for 24 hours after battery liquid-filling, stand 12h at 45 DEG C of high temperature；
Battery is placed in high/low temperature vacuum tank, degasification air pressure -0.04mPa is kept；
Cell voltage is charged to 3.7V with the electric current of 0.02C, keeps vacuum tank temperature at 15 DEG C；
Cell voltage is charged to 4.1V with the electric current of 0.05C, keeps vacuum tank environment temperature at 25 DEG C；
Cell voltage is charged to 4.6V with the electric current of 0.15C, then with 4.6V constant-voltage charge to electric current≤0.02C, is kept
Vacuum tank environment temperature is at 25 DEG C；
Vacuum tank temperature is adjusted to 45 DEG C of progress high temperature ageings, battery is taken out after 48h, vacuum is carried out on degassing apparatus
Pumping sealing, degasification air pressure≤- 0.09mPa；
Water content≤300ppm of battery battery core before fluid injection in above-mentioned steps, above-mentioned all formation processes are in environmental wet
It is carried out under conditions of spending less than 1%.
First charge discharge efficiency is detected respectively to battery after aging, internal resistance, capacity, energy density, multiplying power, cycle performance items refer to
Mark.The results are shown in Table 1.
Comparative example 1
The lithium ion battery that this comparative example provides, production method are as follows:
Positive plate production is identical with embodiment 1.
Cathode mass ratio are as follows: Si-C composite material: conductive black: electrically conductive graphite: sodium carboxymethylcellulose: butadiene-styrene rubber=
95:1.5:1.5:2；Thickener sodium carboxymethylcellulose is dissolved in be configured in deionized water 2.5% glue, then be added lead
Si-C composite material (ratio of silicon is 15%) is repeatedly added in batches, bonding is added after mixing for electric carbon black after dispersion completely
Agent SBR emulsion adds water to adjust viscosity to 2000~4000cp, the slurry mixed is uniformly then coated on thickness
For on 8 μm of copper foils, coated face density is calculated with corresponding to positive electrode capacity excessive 15%, and roll-in cuts to obtain negative electrode tab.
Battery formation process are as follows:
It is sealed after battery liquid-filling, stands 48h under room temperature；
Cell voltage is charged to 4.3V with the electric current of 0.1C, keeps environment temperature at 25 DEG C；
Cell voltage is charged to 4.5V with the electric current of 0.2C, then with 4.5V constant-voltage charge to electric current≤0.02C, retaining ring
Border temperature is at 25 DEG C；
Battery is placed under 45 DEG C of environment and carries out high temperature ageing, takes out battery after 48h, vacuum is carried out on degassing apparatus
Pumping sealing, degasification air pressure≤- 0.09mPa；
Water content≤300ppm of battery battery core before fluid injection in above-mentioned steps, above-mentioned all formation processes are in environmental wet
It is carried out under conditions of spending less than 1%.
First charge discharge efficiency is detected respectively to battery after aging, internal resistance, capacity, energy density, multiplying power, cycle performance items refer to
Mark.The results are shown in Table 1.
Comparative example 2
The lithium ion battery that this comparative example provides, production method are as follows:
Positive plate production is identical with embodiment 1.
Cathode mass ratio are as follows: Si-C composite material: conductive black: electrically conductive graphite: sodium carboxymethylcellulose: butadiene-styrene rubber=
95:1.5:1.5:2；Thickener sodium carboxymethylcellulose is dissolved in be configured in deionized water 2.5% glue, then be added lead
Si-C composite material (ratio of silicon is 7%) is repeatedly added in batches, binder is added after mixing for electric carbon black after dispersion completely
SBR emulsion adds water to adjust viscosity to 2000~4000cp, then the slurry mixed is uniformly coated on a thickness of 8
μm copper foil on, coated face density is calculated with corresponding to positive electrode capacity excessive 15%, and roll-in cuts to obtain negative electrode tab.
Battery formation process are as follows:
It is sealed after battery liquid-filling, stands 48h under room temperature；
Cell voltage is charged to 4.3V with the electric current of 0.1C, maintains the temperature at 25 DEG C；
Cell voltage is charged to 4.5V with the electric current of 0.2C, then with 4.5V constant-voltage charge to electric current≤0.02C, retaining ring
Border temperature is at 25 DEG C；
Battery is placed under 45 DEG C of environment and carries out high temperature ageing, takes out battery after 48h, vacuum is carried out on degassing apparatus
Pumping sealing, degasification air pressure≤- 0.09mPa；
Water content≤300ppm of battery battery core before fluid injection in above-mentioned steps, above-mentioned all formation processes are in environmental wet
It is carried out under conditions of spending less than 1%.
First charge discharge efficiency is detected respectively to battery after aging, internal resistance, capacity, energy density, multiplying power, cycle performance items refer to
Mark.The results are shown in Table 1.
Comparative example 3
The lithium ion battery that this comparative example provides, production method are as follows:
Positive plate production is identical with embodiment 1.
Cathode mass ratio are as follows: artificial graphite material: conductive black: electrically conductive graphite: sodium carboxymethylcellulose: butadiene-styrene rubber=
95:1.5:1.5:2；Thickener sodium carboxymethylcellulose is dissolved in be configured in deionized water 2.5% glue, then be added lead
Artificial graphite material is repeatedly added in electric carbon black in batches after dispersion completely, binder SBR emulsion is added after mixing, adds
Water adjusts viscosity to 2000~4000cp, and then the slurry mixed is uniformly coated on the copper foil with a thickness of 8 μm, is coated with
Surface density is calculated with corresponding to positive electrode capacity excessive 15%, and roll-in cuts to obtain negative electrode tab.
Battery formation process are as follows:
It is sealed after battery liquid-filling, stands 48h under room temperature；
Cell voltage is charged to 4.1V with the electric current of 0.1C, keeps environment temperature at 25 DEG C；
Cell voltage is charged to 4.5V with the electric current of 0.2C, then with 4.5V constant-voltage charge to electric current≤0.02C, retaining ring
Border temperature is at 25 DEG C；
Battery is placed under 45 DEG C of environment and carries out high temperature ageing, takes out battery after 48h, vacuum is carried out on degassing apparatus
Pumping sealing, degasification air pressure≤- 0.09mPa；
Water content≤300ppm of battery battery core before fluid injection in above-mentioned steps, above-mentioned all formation processes are in environmental wet
It is carried out under conditions of spending less than 1%.
First charge discharge efficiency is detected respectively to battery after aging, internal resistance, capacity, energy density, multiplying power, cycle performance items refer to
Mark.The results are shown in Table 1.
Test result is as follows for performance of lithium ion battery obtained by the embodiment of the present invention 1~3 and comparative example 1~3:
Each embodiment and comparative example battery are taken, the internal resistance of cell is measured with voltage internal resistance instrument, is filled at normal temperature with 0.2C electric current
For electricity to full electricity, constant pressure cut-off current is 0.02C, tests each group battery 0.2C discharge capacity respectively, and battery is fully charged, test
The high rate performance and cycle performance of each group battery, test result see the table below 1 and Fig. 2, and Fig. 2 is the embodiment of the present invention 1~3 and compares
The cycle life curve of lithium ion battery after being melted into example 1~3.
1 Examples 1 to 3 of table and 1~3 performance test of comparative example compare
As it can be seen from table 1 lithium ion battery provided by the invention, energy density with higher, are mentioned using the present invention
The chemical synthesizing method of confession plays the capacity of lithium-rich manganese base material and reaches 260~270mAh/g, and battery energy density is reachable
The resistance of 300Wh/kg or so, battery are substantially reduced, and first charge discharge efficiency is obviously improved, and high rate performance and cycle life also obtain obviously
It improves.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of chemical synthesizing method of lithium ion battery, comprising the following steps:
A) lithium ion battery room temperature is stood for 24 hours, then stands 12h at 45 DEG C；
B cell voltage) is charged to by 3.7V with the electric current of 0.02C, keeps environment temperature at 15 DEG C；
C cell voltage) is charged to by 4.1V with the electric current of 0.05C, keeps environment temperature at 25 DEG C；
D cell voltage) is charged to by 4.6V with the electric current of 0.15C, then with 4.6V constant-voltage charge to electric current≤0.02C, retaining ring
Border temperature is at 25 DEG C；
Battery after high temperature ageing, is evacuated envelope by E) high temperature ageing 48 hours at 45 DEG C on degassing apparatus
Mouthful, degasification air pressure≤- 0.09MPa；
Water content before the lithium ion battery liquid injection is not higher than 300ppm；
All steps of the chemical synthesizing method carry out in the environment of humidity is lower than 1%.
2. chemical synthesizing method according to claim 1, which is characterized in that the step B) ~ E) lithium ion battery is set
In high/low temperature vacuum tank, degasification air pressure -0.02MPa ~ -0.06MPa is kept.
3. chemical synthesizing method according to claim 1, which is characterized in that the positive electrode active materials of the lithium ion battery are richness
Lithium manganese based solid solution material.
4. chemical synthesizing method according to claim 3, which is characterized in that the positive electrode active materials of the lithium ion battery are
xLi2MnO3·(1-x)LiMO2, wherein 0 < x < 1, one of M Ni, Mn, Co, Ti, Cr, Al, Fe and Mg or a variety of.
5. chemical synthesizing method according to claim 1, which is characterized in that the negative electrode active material of the lithium ion battery is silicon
Carbon composite or graphite material.
6. chemical synthesizing method according to claim 5, which is characterized in that in the Si-C composite material, the mass fraction of silicon
It is 5 ~ 40%.
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| CN108428930A (en) * | 2018-04-09 | 2018-08-21 | 惠州市赛能电池有限公司 | A kind of method for making electric core of the negative plate containing silicon substrate |
| CN109742455B (en) * | 2018-12-24 | 2022-01-18 | 深圳市量能科技有限公司 | Method for manufacturing lithium ion battery |
| CN109713387A (en) * | 2018-12-27 | 2019-05-03 | 肇庆遨优动力电池有限公司 | A method of improving lithium-rich manganese-based lithium ion battery cyclical stability |
| CN109888421A (en) * | 2019-03-06 | 2019-06-14 | 李壮 | A kind of chemical synthesizing method of low self-discharge lithium ion battery |
| CN111934019A (en) * | 2020-06-29 | 2020-11-13 | 宁波新思创机电科技股份有限公司 | Rapid formation method of power soft-package polymer lithium ion battery |
| CN112820964B (en) * | 2021-01-25 | 2022-03-08 | 江西安驰新能源科技有限公司 | Aging and capacity grading method for lithium ion battery |
| CN113113683B (en) * | 2021-03-12 | 2022-09-16 | 江门市力源电子有限公司 | Formation method of low self-discharge lithium ion battery |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201877496U (en) * | 2010-11-01 | 2011-06-22 | 保定风帆新能源有限公司 | Liquid storage device for storing electrolyte of lithium battery |
| CN103367813A (en) * | 2013-07-23 | 2013-10-23 | 惠州市泰格威电池有限公司 | Formation processing method of lithium manganate battery |
| CN103915643A (en) * | 2013-01-04 | 2014-07-09 | 深圳市鼎力源科技有限公司 | Method for improving performance of square aluminum-shell battery |
| CN104157920A (en) * | 2014-08-29 | 2014-11-19 | 合肥国轩高科动力能源股份公司 | High-energy density lithium ion battery formation method |
-
2017
- 2017-08-24 CN CN201710737395.7A patent/CN107565170B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201877496U (en) * | 2010-11-01 | 2011-06-22 | 保定风帆新能源有限公司 | Liquid storage device for storing electrolyte of lithium battery |
| CN103915643A (en) * | 2013-01-04 | 2014-07-09 | 深圳市鼎力源科技有限公司 | Method for improving performance of square aluminum-shell battery |
| CN103367813A (en) * | 2013-07-23 | 2013-10-23 | 惠州市泰格威电池有限公司 | Formation processing method of lithium manganate battery |
| CN104157920A (en) * | 2014-08-29 | 2014-11-19 | 合肥国轩高科动力能源股份公司 | High-energy density lithium ion battery formation method |
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