CN105742695B - A kind of lithium ion battery and preparation method thereof - Google Patents
A kind of lithium ion battery and preparation method thereof Download PDFInfo
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- CN105742695B CN105742695B CN201610278020.4A CN201610278020A CN105742695B CN 105742695 B CN105742695 B CN 105742695B CN 201610278020 A CN201610278020 A CN 201610278020A CN 105742695 B CN105742695 B CN 105742695B
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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
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- 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
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The present invention discloses a kind of lithium ion battery and preparation method thereof, and certain mass is compared Nano-meter SiO_2 by the present invention2It is added in carbon material used as anode and is well mixed, cathode pole piece is prepared into by being homogenized, being coated with.Using electrochemical principle, by Nano-meter SiO_2 during lithium ion battery formation charging2It is reduced to the amorphous Si O with high storage lithium abilityx(0≤x≤1), reduction potential and SEI films the formation current potential of reaction are close, change solid liquid interface state-of-charge, the C SiO of generationxThe special composition structure of negative material and apparent porosity, while the composition of SEI films, structure are improved, it is that the performance of high energy lithium ion cell plays, has built good battery core microstructure.The present invention not only increases battery energy density, also improves the high rate performance and service life cycle of battery.
Description
Technical field
The present invention relates to field of lithium ion battery, more particularly to a kind of lithium ion battery and preparation method thereof.
Background technology
With widely using for portable electric appts so that high energy lithium ion cell is developed into focus.At present,
Negative electrode of lithium ion battery material therefor is mostly carbon-based material, and capacity is relatively low, can not meet lithium ion battery high-energy, small size
Demand for development.And make with high specific capacity（4200mAh/g）Silicon materials receive much concern, but pure silicon material fills in battery
Serious Volume Changes in discharge process be present, and cause pole piece efflorescence, come off, electrode active material is lost electricity with collector
Contact, influences the cycle performance of battery, battery security can be also influenceed when serious；It is 6.7 and the intrinsic conductivity of silicon is smaller
×10-4s•cm-1, it is difficult to lift the high current charge-discharge ability of lithium ion battery.
There are technical research personnel that carbon negative pole material and silicon based anode material are used in combination, material property is maximized favourable factors and minimized unfavourable ones,
High-performance lithium battery is prepared, as disclosed a kind of Si-SiO of core shell structure in patent CN200810154217.2x- C-material and
Its preparation method, material conductivity is improved, improve material circulation performance and specific capacity, but can not still meet to be actually needed；
The carbon containing Si oxide that a kind of SiO gases are co-deposited with carbonaceous gas is disclosed in patent CN201280049685.8, although first
Secondary charging capacity, but charge and discharge is less efficient first, and cycle performance is also only the conservation rate under half-cell low current situation, is unsuitable for
Actual use, and this reaction reduces for high-temperature reducing gas, easily generates SiC, influences battery high rate performance, and tedious process,
It is unfavorable for actual production.
Therefore, prior art has yet to be improved and developed.
The content of the invention
In view of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of lithium ion battery and its preparation side
Method, it is intended to solve existing lithium ion battery and be still difficult to that satisfaction is actually needed, battery high rate performance is low and cycle performance conservation rate
The problem of low.
Technical scheme is as follows：
A kind of preparation method of lithium ion battery, wherein, including step：
A, by negative pole carbon, white carbon, bonding agent according to 80~85：5~15：5~10 mass ratios, which are added in solvent, to be filled
Divide and be mixed into cathode size, cathode size is applied on copper foil, cathode pole piece is obtained after drying；
B, according to positive electrode capacity/capacity of negative plates be 1.01-1.05 ratio, by positive electrode, conductive agent, binding agent according to
80~85:5~10:7 ~ 12 mass ratio, which is added in solvent, to be sufficiently mixed uniformly into anode sizing agent, and anode sizing agent is applied into aluminium
On paper tinsel, anode pole piece is obtained after drying；
C, positive pole, cathode pole piece are cut into corresponding size according to different battery core designs, vacuum drying remove solvent and
Moisture, it is standby；
D, standby positive pole, cathode pole piece, barrier film and electrolyte are assembled into lithium ion battery, stands 14 ~ 18h；
E, lithium ion battery being melted into, the chemical conversion work step is 0.01C ~ 0.03C low current charges to 3.2 ~ 3.6V,
0.05C ~ 0.1C is charged to 3.8 ~ 4.0V, is discharged to 2.8 ~ 3.2V with 0.1 ~ 0.3C, charge and discharge circulates 2 ~ 4 times；
F, 5 ~ 9 days are stood to the lithium ion battery being melted into, carries out capacity, multiplying power, cycle life test, voltage tester model
Enclose 3.0V-4.2V.
The preparation method of described lithium ion battery, wherein, in step A, the negative pole carbon, white carbon, bonding agent according to
80：10：10 mass ratios are added in solvent.
The preparation method of described lithium ion battery, wherein, in step A, the negative pole carbon is native graphite, artificial stone
One or more in ink, carbon black, coke, carbonaceous mesophase spherules, carbon fiber.
The preparation method of described lithium ion battery, wherein, the solvent in the step A and B is nmp solvent.
The preparation method of described lithium ion battery, wherein, in step B, the ratio of positive electrode capacity/capacity of negative plates is
1.02。
The preparation method of described lithium ion battery, wherein, in step B, positive electrode, conductive agent, binding agent are according to 82:
8:10 mass ratio is added in solvent.
The preparation method of described lithium ion battery, wherein, in step B, the positive electrode be cobalt acid lithium, LiMn2O4,
One or more in nickle cobalt lithium manganate, nickel cobalt lithium aluminate, LiFePO4.
The preparation method of described lithium ion battery, wherein, in step D, the electrolyte is LiPF6/EC-EMC-DMC、
LiAsF6/PC-EMC-DMC、LiBF4One kind in/MPC-EMC-DMC.
The preparation method of described lithium ion battery, wherein, in step E, the chemical conversion work step is 0.02C low current charges
To 3.4V, 0.1C is charged to 4.0V, and charge and discharge circulates 3 times.
A kind of lithium ion battery, wherein, the preparation method of use as above any described lithium ion battery is prepared.
Beneficial effect：The amorphous Si O of height storage lithium abilityx(0≤X≤1) improves the volume energy of battery, fine and close, steady
Fixed SEI films improve the cycle life of battery, rate charge-discharge performance.Compared to existing Si-C composite material, have higher
Coulombic efficiency first and cyclical stability.
Embodiment
The present invention provides a kind of lithium ion battery and preparation method thereof, to make the purpose of the present invention, technical scheme and effect
Clearer, clear and definite, the present invention is described in more detail below.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
Due to negative electrode of lithium ion battery surface solid electrolyte interface film（SEI）Not only influence the removal lithium embedded power of electrode
Learn, have an effect on the surface stability during charge and discharge cycles, and the pattern of SEI films and composition depending on electrolyte composition,
Solid negative terminal surface composition, structure.The present invention is by Nano carbon white（SiO2）In the cathode blending stage with certain mass than adding
Into negative pole carbon, it is well mixed, coating.The stage is melted into lithium ion battery, by Nano-meter SiO_22It is reduced to that there is high storage lithium ability
SiOx(0≤X≤1), approached because electrode potential and the SEI of the reaction form current potential, change negative electrode of lithium ion battery surface
State-of-charge, the composition of negative terminal surface SEI films, structure is set to be optimized, improved.
Specifically, the preparation method preferred embodiment of a kind of lithium ion battery of the invention, wherein, including step：
A, by negative pole carbon, white carbon, bonding agent according to 80~85：5~15：5~10 mass ratios, which are added in solvent, to be filled
Divide and be mixed into cathode size, cathode size is applied on copper foil, cathode pole piece is obtained after drying；
Preferably, in step A, the negative pole carbon, white carbon, bonding agent are according to 80：10：10 mass ratios are added to solvent
In.Wherein, the negative pole carbon can be one in native graphite, Delanium, carbon black, coke, carbonaceous mesophase spherules, carbon fiber
Kind is several.Wherein, the solvent can be nmp solvent.
B, according to positive electrode capacity/capacity of negative plates be 1.01-1.05 ratio, by positive electrode, conductive agent, binding agent according to
80~85:5~10:7 ~ 12 mass ratio, which is added in solvent, to be sufficiently mixed uniformly into anode sizing agent, and anode sizing agent is applied into aluminium
On paper tinsel, anode pole piece is obtained after drying.Wherein, the solvent can be nmp solvent.
Preferably, in step B, the ratio of positive electrode capacity/capacity of negative plates is 1.02.The positive electrode can be cobalt acid
One or more in lithium, LiMn2O4, nickle cobalt lithium manganate, nickel cobalt lithium aluminate, LiFePO4.
C, positive pole, cathode pole piece are cut into corresponding size according to different battery core designs, vacuum drying remove solvent and
Moisture, it is standby；Preferably, vacuum drying removes solvent and moisture at 120 DEG C.
D, standby positive pole, cathode pole piece, barrier film and electrolyte are assembled into lithium ion battery, stands 14 ~ 18h；Preferably,
The electrolyte can be but be not limited to LiPF6/EC-EMC-DMC、LiAsF6/PC-EMC-DMC、LiBF4In/MPC-EMC-DMC
One kind.It is barrier film with Celgard 2400 for example, by standby positive pole, cathode pole piece, 1mol/L LiPF6/EC-EMC-
DMC（EC-EMC-DMC volume ratios are 1:1:1）For electrolyte, lithium ion battery is assembled, stands 16h.
E, lithium ion battery being melted into, the chemical conversion work step is 0.01C ~ 0.03C low current charges to 3.2 ~ 3.6V,
0.05C ~ 0.1C is charged to 3.8 ~ 4.0V, is discharged to 2.8 ~ 3.2V with 0.1 ~ 0.3C, charge and discharge circulates 2 ~ 4 times；Preferably, the chemical conversion
Work step be 0.02C low current charges to 3.4V, 0.1C is charged to 4.0V, and charge and discharge circulates 3 times.
F, 5 ~ 9 days are stood to the lithium ion battery being melted into, carries out capacity, multiplying power, cycle life test, voltage tester model
Enclose 3.0V-4.2V.
The present invention has following technical characteristic：（1）Using electrochemical principle, in the formation charging stage, by Nano-meter SiO_22
It is reduced to the amorphous Si O with high storage lithium abilityx(0≤X≤1)；（2）By Nano-meter SiO_22With conventional carbons negative material according to
Certain proportion is well mixed, and is coated on cathode pole piece, makes the amorphous Si O of generationx(0≤X≤1) is evenly distributed on good
In the carbon-based material conductive network of electric conductivity, material electronicses conductance is improved, while slow down SiOx(0≤X≤1) is in removal lithium embedded
During bulk effect.（3）Generate amorphous Si OxReduction potential and SEI films to form current potential close, change solid-liquid circle
Face state-of-charge, C-SiOxThe special apparent structure porosity of composite construction, composition, the structure of SEI films are improved jointly, for height
The performance of energy lithium ion battery plays, and has built good battery core microstructure.（4）Always held using carbon during conventional cell designs
Amount/positive electrode total capacity is more than 1, and battery design of the present invention uses ratio of the positive electrode total capacity/carbon total capacity for 1.01-1.05.（5）
The present invention is than directly from carbon and nano-silicon compound phase ratio, cost advantage is obvious, and method is simple and easy to operate, is adapted to large-scale industry
Production.
The present invention also provides a kind of lithium ion battery, wherein, the preparation side of use as above any described lithium ion battery
Method is prepared.By preparation method of the present invention, obtained lithium ion battery has high battery energy density, while has height
Battery high rate performance and service life cycle.
Below by specific embodiment, the present invention is described in detail.
Embodiment 1
By Delanium, white carbon（SiO2）, binding agent is according to 80:10:10 mass ratios are added in nmp solvent fully
Cathode size is mixed into, cathode size is applied on copper foil, cathode pole piece is obtained after drying；By LiFePO4, conductive agent, glue
Agent is tied according to 85:5:10 mass ratio, which is added in nmp solvent, to be sufficiently mixed uniformly into anode sizing agent, and anode sizing agent is applied to
On aluminium foil, anode pole piece is obtained after drying, positive electrode capacity/capacity of negative plates design proportion is 1.01.Battery core is designed and sized to 8（T）×
34（W）×50(H)mm.It is barrier film with Celgard 2400,1mol/L LiPF6/EC-EMC-DMC（Volume ratio is 1:1:1）For
Electrolyte, lithium ion battery is assembled, stand 16h.Lithium ion battery is melted into, chemical conversion work step is arranged to 0.02C low currents
3.4V is charged to, 0.1C is charged to 3.9V, is discharged to 3.0V with 0.1C, charge and discharge circulates 3 times.Lithium ion battery after chemical conversion is carried out
Capacity, multiplying power, cycle life test, voltage tester scope 3.0V-4.2V, test result see the table below 1.
Embodiment 2
By native graphite, white carbon（SiO2）, binding agent is according to 85:10:5 mass ratios are added in nmp solvent fully
Cathode size is mixed into, cathode size is applied on copper foil, cathode pole piece is obtained after drying；By nickle cobalt lithium manganate, conductive agent,
Binding agent is according to 85:5:10 mass ratio, which is added in nmp solvent, to be sufficiently mixed uniformly into anode sizing agent, and anode sizing agent is applied
In on aluminium foil, obtaining anode pole piece after drying, positive electrode capacity/capacity of negative plates design proportion is 1.03.Battery is melted into, is melted into
Work step is arranged to 0.03C low current charges and is charged to 4.0V to 3.4V, 0.1C, is discharged to 3.0V with 0.1C, charge and discharge circulates 2 times.Electricity
With embodiment 1, test result see the table below 1 for core size, battery assembling condition, test condition.
Embodiment 3
By carbonaceous mesophase spherules, white carbon（SiO2）, binding agent is according to 80:15:5 mass ratios are added in nmp solvent
It is sufficiently mixed uniformly, cathode size is applied on copper foil, cathode pole piece is obtained after drying；By LiMn2O4, conductive agent, binding agent according to
85:5:10 mass ratio, which is added in nmp solvent, to be sufficiently mixed uniformly into anode sizing agent, and anode sizing agent is applied on aluminium foil,
Anode pole piece is obtained after drying, positive electrode capacity/capacity of negative plates design proportion is 1.05.Battery is melted into, chemical conversion work step is set
For 0.01C low current charges to 3.4V, 0.05C is charged to 3.8V, is discharged to 3.0V with 0.1C, charge and discharge circulates 4 times.Battery core size,
With embodiment 1, test result see the table below 1 for battery assembling condition, test condition.
Embodiment 4
By carbon black, white carbon（SiO2）, binding agent is according to 85:5:10 mass ratios, which are added in nmp solvent, to be sufficiently mixed
Uniformly into cathode size, cathode size is applied on copper foil, cathode pole piece is obtained after drying；Cobalt acid lithium, conductive agent, binding agent are pressed
According to 85:5:10 mass ratio, which is added in nmp solvent, to be sufficiently mixed uniformly into anode sizing agent, and anode sizing agent is applied into aluminium foil
On, anode pole piece is obtained after drying, positive electrode capacity/capacity of negative plates design proportion is 1.02.Battery core size, battery assembling condition, change
Into, test condition with embodiment 1, test result see the table below 1.
Comparative example 1：
By Delanium, binding agent according to 90:10 mass ratios are added in nmp solvent to be sufficiently mixed and uniformly starched into negative pole
Material, cathode size is applied on copper foil, and cathode pole piece is obtained after drying；The coating of iron phosphate lithium positive pole piece, the assembling of battery core size, battery
With embodiment 1, test result see the table below 1 for condition, chemical conversion, test condition.
Comparative example 2：
By native graphite, binding agent according to 90:10 mass ratios, which are added in solvent, to be sufficiently mixed uniformly into cathode size,
Cathode size is applied on copper foil, cathode pole piece is obtained after drying；The coating of nickle cobalt lithium manganate positive plate, it is melted into embodiment 2, battery core
With embodiment 1, test result see the table below 1 for size, battery assembling condition, test condition.
Comparative example 3：
By carbonaceous mesophase spherules, binding agent according to 95:5 mass ratios are added in solvent to be sufficiently mixed and uniformly starched into negative pole
Material, cathode size is applied on copper foil, and cathode pole piece is obtained after drying；Lithium manganate anode slice coating is melted into, with embodiment 3, battery core
With embodiment 1, test result see the table below 1 for size, battery assembling condition, test condition.
Comparative example 4：
By carbon black, binding agent according to 90:10 mass ratios, which are added in solvent, to be sufficiently mixed uniformly into cathode size, will be negative
Pole slurry is applied on copper foil, and cathode pole piece is obtained after drying；The coating of lithium cobaltate cathode piece is the same as embodiment 4, battery core size, battery assembling
With embodiment 1, test result see the table below 1 for condition, chemical conversion, test condition.
Comparative example 5：
By Delanium, nano silica fume, binding agent according to 80:10:10 mass ratios, which are added in solvent, to be sufficiently mixed
It is even cathode size to be applied on copper foil into cathode size, after drying cathode pole piece；The coating of iron phosphate lithium positive pole piece, battery core chi
With embodiment 1, test result see the table below 1 for very little, battery assembling condition, chemical conversion, test condition.
Table 1, test result
| 1C capacity first（mAh/g） | Charge and discharge efficiency first（%） | 2C capacity（mAh/g） | 5C capacity（mAh/g） | 1C circulates 500 capability retentions（%） | |
| Embodiment 1 | 960 | 96 | 890 | 793 | 87.6 |
| Embodiment 2 | 1100 | 97.8 | 1043 | 958 | 84 |
| Embodiment 3 | 720 | 94.7 | 623 | 511 | 78 |
| Embodiment 4 | 930 | 97 | 876 | 792 | 83 |
| Comparative example 1 | 750 | 98.9 | 704 | 648 | 94 |
| Comparative example 2 | 800 | 99.6 | 778 | 716 | 89 |
| Comparative example 3 | 500 | 98.2 | 463 | 378 | 83 |
| Comparative example 4 | 700 | 99.3 | 675 | 615 | 90 |
| Comparative example 5 | 987 | 83 | 752 | 569 | 54.8 |
In summary, a kind of lithium ion battery provided by the invention and preparation method thereof, the present invention receive certain mass ratio
Rice SiO2It is added in carbon material used as anode and is well mixed, cathode pole piece is prepared into by being homogenized, being coated with.Using electrochemical principle,
By Nano-meter SiO_2 during lithium ion battery formation charging2It is reduced to the amorphous Si O with high storage lithium abilityx(0≤x≤1),
The reduction potential of reaction is close with SEI films formation current potential, changes solid liquid interface state-of-charge, the C-SiO of generationxNegative material
Special composition structure and apparent porosity, while the composition of SEI films, structure are improved, it is high energy lithium ion cell
Performance plays, and has built good battery core microstructure.The present invention not only increases battery energy density, also improves battery
High rate performance and service life cycle.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can
To be improved or converted according to the above description, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Protect scope.
Claims (10)
1. a kind of preparation method of lithium ion battery, it is characterised in that including step：
A, by negative pole carbon, white carbon, bonding agent according to 80~85：5~15：5~10 mass ratios are added in solvent fully mixed
Close uniformly into cathode size, cathode size is applied on copper foil, cathode pole piece is obtained after drying；
B, according to the ratio that positive electrode capacity/capacity of negative plates is 1.01-1.05, by positive electrode, conductive agent, binding agent according to 80 ~
85:5~10:7 ~ 12 mass ratio, which is added in solvent, to be sufficiently mixed uniformly into anode sizing agent, and anode sizing agent is applied into aluminium foil
On, anode pole piece is obtained after drying；
C, positive pole, cathode pole piece being cut into corresponding size according to different battery core designs, vacuum drying removes solvent and moisture,
It is standby；
D, standby positive pole, cathode pole piece, barrier film and electrolyte are assembled into lithium ion battery, stands 14 ~ 18h；
E, lithium ion battery being melted into, the chemical conversion work step is 0.01C ~ 0.03C low current charges to 3.2 ~ 3.6V,
0.05C ~ 0.1C is charged to 3.8 ~ 4.0V, is discharged to 2.8 ~ 3.2V with 0.1 ~ 0.3C, charge and discharge circulates 2 ~ 4 times；
In the charging stage of lithium ion battery chemical conversion, white carbon is reduced to unbodied SiOx, wherein 0≤X≤1；
F, 5 ~ 9 days are stood to the lithium ion battery being melted into, carries out capacity, multiplying power, cycle life test, voltage tester scope
3.0V-4.2V。
2. the preparation method of lithium ion battery according to claim 1, it is characterised in that in step A, the negative pole carbon,
White carbon, bonding agent are according to 80：10：10 mass ratios are added in solvent.
3. the preparation method of lithium ion battery according to claim 1, it is characterised in that in step A, the negative pole carbon is
One or more in native graphite, Delanium, carbon black, coke, carbonaceous mesophase spherules, carbon fiber.
4. the preparation method of lithium ion battery according to claim 1, it is characterised in that the solvent in the step A and B
It is nmp solvent.
5. the preparation method of lithium ion battery according to claim 1, it is characterised in that in step B, positive electrode capacity/negative
The ratio of pole capacity is 1.02.
6. the preparation method of lithium ion battery according to claim 1, it is characterised in that in step B, positive electrode, lead
Electric agent, binding agent are according to 82:8:10 mass ratio is added in solvent.
7. the preparation method of lithium ion battery according to claim 1, it is characterised in that in step B, the positive electrode
For the one or more in cobalt acid lithium, LiMn2O4, nickle cobalt lithium manganate, nickel cobalt lithium aluminate, LiFePO4.
8. the preparation method of lithium ion battery according to claim 1, it is characterised in that in step D, the electrolyte is
LiPF6/EC-EMC-DMC、LiAsF6/PC-EMC-DMC、LiBF4One kind in/MPC-EMC-DMC.
9. the preparation method of lithium ion battery according to claim 1, it is characterised in that in step E, the chemical conversion work step
For 0.02C low current charges to 3.4V, 0.1C is charged to 4.0V, and charge and discharge circulates 3 times.
10. a kind of lithium ion battery, it is characterised in that using the preparation of the lithium ion battery as described in claim 1 ~ 9 is any
Method is prepared.
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| CN106252717A (en) * | 2016-10-19 | 2016-12-21 | 江苏海四达电源股份有限公司 | High circulation electric vapour vehicle lithium-ion power battery and preparation method thereof |
| CN106987926B (en) * | 2017-04-14 | 2020-10-02 | 王立勇 | Asphalt-based carbon fiber, preparation method and application thereof in lithium ion battery |
| CN108400025B (en) * | 2018-01-18 | 2019-11-15 | 柔电（武汉）科技有限公司 | A kind of preparation method of supercapacitor |
| CN112599861A (en) * | 2020-12-28 | 2021-04-02 | 长虹三杰新能源有限公司 | Preparation method of lithium cobaltate power battery |
| CN115810797A (en) * | 2021-11-15 | 2023-03-17 | 宁德时代新能源科技股份有限公司 | Lithium ion battery, battery module, battery pack and electric device |
| CN113948708B (en) * | 2021-12-22 | 2022-03-18 | 惠州市纬世新能源有限公司 | Fast-charging type high-rate lithium ion battery and preparation method thereof |
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| CN101752547A (en) * | 2008-12-18 | 2010-06-23 | 中国电子科技集团公司第十八研究所 | Li-ion secondary battery cathode material preparation method with nuclear shell structure |
| CN103857623A (en) * | 2011-10-14 | 2014-06-11 | 信越化学工业株式会社 | Silicon oxide for negative electrode material of nonaqueous electroltye secondary cell, method for producing same, lithium ion secondary cell, and electrochemical capacitor |
| CN103985846A (en) * | 2014-05-30 | 2014-08-13 | 西安交通大学 | Carbon-loaded silica nanoparticle structure as well as preparation method and application thereof |
| CN104577085A (en) * | 2014-12-17 | 2015-04-29 | 李震祺 | Lithium ion battery SiO negative electrode material and preparation method thereof |
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| CN101752547A (en) * | 2008-12-18 | 2010-06-23 | 中国电子科技集团公司第十八研究所 | Li-ion secondary battery cathode material preparation method with nuclear shell structure |
| CN103857623A (en) * | 2011-10-14 | 2014-06-11 | 信越化学工业株式会社 | Silicon oxide for negative electrode material of nonaqueous electroltye secondary cell, method for producing same, lithium ion secondary cell, and electrochemical capacitor |
| CN103985846A (en) * | 2014-05-30 | 2014-08-13 | 西安交通大学 | Carbon-loaded silica nanoparticle structure as well as preparation method and application thereof |
| CN104577085A (en) * | 2014-12-17 | 2015-04-29 | 李震祺 | Lithium ion battery SiO negative electrode material and preparation method thereof |
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