CN108321429A - A kind of ultralow temperature extended-life lithium ion battery - Google Patents
A kind of ultralow temperature extended-life lithium ion battery Download PDFInfo
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- CN108321429A CN108321429A CN201810134604.3A CN201810134604A CN108321429A CN 108321429 A CN108321429 A CN 108321429A CN 201810134604 A CN201810134604 A CN 201810134604A CN 108321429 A CN108321429 A CN 108321429A
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a kind of ultralow temperature extended-life lithium ion batteries, it is related to technical field of lithium ion, including battery case, anode pole piece, cathode pole piece, diaphragm and electrolyte, anode pole piece includes plus plate current-collecting body and the anode sizing agent coated in plus plate current-collecting body two sides, and cathode pole piece includes negative current collector and the negative electrode slurry coated in negative current collector two sides；Anode sizing agent includes the first solvent, rare earth richness magnesium-based powder, positive active material, the first conductive agent and first binder, and the one side applies charge level density of anode pole piece is 175g/m2~190g/m2；Negative electrode slurry includes the second solvent, negative electrode active material, the second conductive agent and the second binder.The present invention improves the low temperature and ultralow temperature cycle performance of lithium ion battery, expand lithium ion battery the fields such as aerospace, military project, electric vehicle application range.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly to a kind of ultralow temperature extended-life lithium ion battery.
Background technology
Lithium ion battery has specific capacity is big, operating voltage is high, have extended cycle life, memory-less effect, environmental pollution are small etc.
Advantage, soon instead of ni-Cd and Ni-MH battery, has been widely used in mobile electricity since early 1990s are commercialized
In the portable electronics such as words, laptop, video camera.
In fields such as aerospace, military project, electric vehicles, it is desirable that battery can at -40 DEG C of even lower temperature normal work
Make and have longer cycle life, but the cryogenic property of lithium ion battery in the prior art is poor, the performance meeting at -20 DEG C
It is apparent to deteriorate, discharge capacity rapid drawdown；Can be lower in -40 DEG C of discharge capacities, cycle life is short, i.e., lithium ion in the prior art
The low temperature and ultralow temperature poor circulation of battery.
Invention content
In view of this, the present invention provides a kind of ultralow temperature extended-life lithium ion battery, it can be in -40 DEG C of even lower temperature
Degree is lower to work normally and has longer cycle life, improves the low temperature and ultralow temperature cycle performance of lithium ion battery, expands
Application range of the lithium ion battery in fields such as aerospace, military project, electric vehicles.
The present invention is solved the above problems by following technological means：
The present invention a kind of ultralow temperature extended-life lithium ion battery, including battery case and be located at the battery case
Interior anode pole piece, cathode pole piece and electrolyte, is provided with diaphragm, feature between the anode pole piece and the cathode pole piece
It is：Further include：The anode pole piece includes plus plate current-collecting body and the anode sizing agent coated in the plus plate current-collecting body two sides, institute
It includes negative current collector and the negative electrode slurry coated in the negative current collector two sides to state cathode pole piece；The anode sizing agent includes
First solvent, rare earth richness magnesium-based powder, positive active material, the first conductive agent and first binder, and the anode pole piece
One side applies charge level density is 175g/m2~190g/m2, the quality proportioning of the rare earth richness magnesium-based powder is 1%~5%, it is described just
The quality proportioning of pole active material is 90%~95%, and the quality proportioning of first conductive agent is 1%~5%, described first
The quality proportioning of binder is 3%~8%；The negative electrode slurry include the second solvent, negative electrode active material, the second conductive agent and
The quality proportioning of second binder, the negative electrode active material is 90%~94%, and the quality proportioning of second conductive agent is
1%~5%, the quality proportioning of second binder is 5%~10%.
Further, the positive active material includes at least LiMn2O4, LiFePO4, cobalt acid lithium, lithium-rich manganese base material Li
(LixM1-x)O2, one kind in nickel cobalt aluminium ternary material and nickel-cobalt-manganese ternary material.
Further, the rare earth richness magnesium-based powder be scandium oxide, yttrium oxide, lanthana, cerium oxide, praseodymium oxide, ytterbium oxide,
The mixed powder of one or more of titanium oxide, zirconium oxide and magnesia.
Further, first conductive agent is the mixed powder of graphene and carbon nanotube.
Further, first solvent is N-Methyl pyrrolidone, and the first binder is Kynoar.
Further, the negative electrode active material includes at least one in natural graphite, carbonaceous mesophase spherules and artificial graphite
Kind.
Further, second conductive agent is the mixed powder of graphene and carbon nanotube.
Further, second solvent is N-Methyl pyrrolidone, and second binder is Kynoar.
A kind of ultralow temperature extended-life lithium ion battery of the present invention has the advantages that：
The present invention provides a kind of ultralow temperature extended-life lithium ion batteries, are added in the anode sizing agent of anode pole piece dilute
Native richness magnesium-based powder, and using Kynoar as first binder and the second binder, and by the one side applies of anode pole piece
Charge level density is limited to 175g/m2~190g/m2, using graphene and the mixed powder of carbon nanotube as the first conductive agent and
Second conductive agent makes lithium ion battery that can be worked normally under -40 DEG C of low temperature environment and has longer cycle life, that is, carries
The high low temperature and ultralow temperature cycle performance of lithium ion battery, expands lithium ion battery in aerospace, military project, electric vehicle etc.
The application range in field.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the ultralow temperature extended-life lithium ion battery of the embodiment of the present invention one at -40 DEG C, and multiplying power is that 0.2C is put
The curve graph of capacitance and capacity retention ratio.
Specific implementation mode
The present invention a kind of ultralow temperature extended-life lithium ion battery, including battery case and be located at the battery case
Interior anode pole piece, cathode pole piece and electrolyte, is provided with diaphragm, feature between the anode pole piece and the cathode pole piece
It is：Further include：The anode pole piece includes plus plate current-collecting body and the anode sizing agent coated in the plus plate current-collecting body two sides, institute
It includes negative current collector and the negative electrode slurry coated in the negative current collector two sides to state cathode pole piece.
Wherein, the anode sizing agent includes the first solvent, rare earth richness magnesium-based powder, positive active material, the first conductive agent
And first binder, and the one side applies charge level density of the anode pole piece is 175g/m2~190g/m2, the rare earth richness magnesium-based powder
The quality proportioning of body is 1%~5%, and the quality proportioning of the positive active material is 90%~95%, first conductive agent
Quality proportioning be 1%~5%, the quality proportioning of the first binder is 3%~8%.
The negative electrode slurry includes the second solvent, negative electrode active material, the second conductive agent and the second binder, the cathode
The quality proportioning of active material is 90%~94%, and the quality proportioning of second conductive agent is 1%~5%, and described second is viscous
The quality proportioning for tying agent is 5%~10%.
Further, the positive active material includes at least LiMn2O4, LiFePO4, cobalt acid lithium, lithium-rich manganese base material
Li(LixM1-x)O2, one kind in nickel cobalt aluminium ternary material and nickel-cobalt-manganese ternary material.
Further, the rare earth richness magnesium-based powder is scandium oxide, yttrium oxide, lanthana, cerium oxide, praseodymium oxide, oxidation
The mixed powder of one or more of ytterbium, titanium oxide, zirconium oxide and magnesia.
Further, first conductive agent is the mixed powder of graphene and carbon nanotube.
Further, first solvent is N-Methyl pyrrolidone, and the first binder is Kynoar.
Further, the negative electrode active material includes at least in natural graphite, carbonaceous mesophase spherules and artificial graphite
It is a kind of.
Further, second conductive agent is the mixed powder of graphene and carbon nanotube.
Further, second solvent is N-Methyl pyrrolidone, and second binder is Kynoar.
It should be noted that being also filled with electrolyte in battery case in the present invention, plus plate current-collecting body can be aluminium foil,
Negative current collector can be copper foil, and the shape of lithium ion battery and the type of electrolyte are not construed as limiting, can select according to demand
With usual manner in the prior art.
It should be noted that the present invention can be used when preparing anode sizing agent, anode pole piece, negative electrode slurry and cathode pole piece
Following methods, it is specific as follows：
Embodiment one：
Prepare anode sizing agent：Positive active material selects LiMn2O4, rare earth richness magnesium-based powder to select scandium oxide and magnesia
Mixed powder, and the mass ratio of scandium oxide and magnesia be 2:1, the first conductive agent is the mixed powder of graphene and carbon nanotube
Body, and graphene and the mass ratio of carbon nanotube are 2:1；First binder is Kynoar, and the first solvent is N- methyl pyrroles
Pyrrolidone, and the quality of the positive active material, rare earth richness magnesium-based powder, the first conductive agent and first binder in embodiment one
Than being 91:2:2:5, by positive active material, rare earth richness magnesium-based powder, the first conductive agent and the first binder in embodiment one
It is mixed, and is stirred evenly to get to anode sizing agent with N-Methyl pyrrolidone.
Prepare anode pole piece：The two of plus plate current-collecting body will be uniformly coated in using the anode sizing agent prepared in embodiment one
Face so that one side applies charge level density is 180g/m2, then anode pole piece is dried, N-Methyl pyrrolidone is made to volatilize completely, then
It is cut out according to pre-set dimension, and the anode pole piece after roll-in is finally positioned in vacuum drying oven by roll-in to preset thickness
Drying, obtains anode pole piece.
Prepare negative electrode slurry：It is graphene and carbon nanometer that negative electrode active material, which selects carbonaceous mesophase spherules, the second conductive agent,
The mixed powder of pipe, and graphene and the mass ratio of carbon nanotube are 2:1；Second binder is Kynoar, the second solvent
The mass ratio of negative electrode active material, the second conductive agent, the second binder for N-Methyl pyrrolidone, and in embodiment one is
91:1:8, negative electrode active material, the second conductive agent, the second binder and the N-Methyl pyrrolidone in embodiment one are mixed
It closes, and stirs evenly to get to negative electrode slurry.
Prepare cathode pole piece：To negative current collector be uniformly coated in using the negative electrode slurry prepared in above-described embodiment one
Two sides, then cathode pole piece is dried, N-Methyl pyrrolidone is made to volatilize completely, is cut out according still further to pre-set dimension, and
Cathode pole piece after roll-in is finally positioned in vacuum drying oven and dries, obtain cathode pole piece to preset thickness by roll-in.
The preparation of lithium ion battery：By the anode pole piece prepared using above-described embodiment one, diaphragm and use above-mentioned implementation
Cathode pole piece prepared by example one is wound into battery core, then battery core is packed into battery case, in battery case after vacuum drying
Interior injection electrolyte, is finally sealed, and stands a period of time, obtains lithium ion battery.
As shown in table 1 and Fig. 1, the discharge data for being the lithium ion battery that is prepared using embodiment one at -40 DEG C with
Cycle performance figure, discharge-rate 0.2C.From table 1 it follows that when discharge-rate is 0.2C, discharge capacity decays to initially
80.2% corresponding cycle-index of capacity is 1017 times, illustrates the lithium ion battery prepared using embodiment one at -40 DEG C
It can be worked normally under low temperature and there is longer cycle life.
Discharge data of the lithium ion battery that table 1 is prepared using embodiment one at -40 DEG C
| Cycle-index | Discharge capacity (mAh) | Capacity retention ratio (%) |
| 1st time | 1843.3 | 100.0% |
| 200th time | 1809.2 | 98.2% |
| 400th time | 1768.4 | 95.9% |
| 600th time | 1703.7 | 92.4% |
| 800th time | 1604.5 | 87.0% |
| 1000th time | 1505.9 | 81.7% |
| 1017th time | 1478.3 | 80.2% |
Embodiment two：
Prepare anode sizing agent：Positive active material select LiMn2O4, rare earth richness magnesium-based powder select lanthana, ytterbium oxide and
The mixed powder of magnesia, and the mass ratio of lanthana, ytterbium oxide and magnesia is 4:3:3, the first conductive agent be graphene and
The mixed powder of carbon nanotube, and graphene and the mass ratio of carbon nanotube are 2:1, first binder is Kynoar, the
One solvent is N-Methyl pyrrolidone, and positive active material in embodiment two, rare earth richness magnesium-based powder, the first conductive agent and
The mass ratio of first binder is 91:2:2:5, by embodiment two positive active material, rare earth richness magnesium-based powder, first lead
Electric agent and first binder are mixed with N-Methyl pyrrolidone, and are stirred evenly to get to anode sizing agent.
Prepare anode pole piece：The two of plus plate current-collecting body will be uniformly coated in using the anode sizing agent prepared in embodiment two
Face so that one side applies charge level density is 180g/m2, then anode pole piece is dried, N-Methyl pyrrolidone is made to volatilize completely, then
It is cut out according to pre-set dimension, and the anode pole piece after roll-in is finally positioned in vacuum drying oven by roll-in to preset thickness
Drying, obtains anode pole piece.
Prepare negative electrode slurry：It is graphene and carbon nanometer that negative electrode active material, which selects carbonaceous mesophase spherules, the second conductive agent,
The mixed powder of pipe, and graphene and the mass ratio of carbon nanotube are 2:1, the second binder is Kynoar, the second solvent
The mass ratio of negative electrode active material, the second conductive agent, the second binder for N-Methyl pyrrolidone, and in embodiment two is
91:1:8, negative electrode active material, the second conductive agent, the second binder and the N-Methyl pyrrolidone in embodiment two are mixed
It closes, and stirs evenly to get to negative electrode slurry.
Prepare cathode pole piece：To negative current collector be uniformly coated in using the negative electrode slurry prepared in above-described embodiment two
Two sides, then cathode pole piece is dried, N-Methyl pyrrolidone is made to volatilize completely, is cut out according still further to pre-set dimension, and
Cathode pole piece after roll-in is finally positioned in vacuum drying oven and dries, obtain cathode pole piece to preset thickness by roll-in.
The preparation of lithium ion battery：By the anode pole piece prepared using above-described embodiment two, diaphragm and use above-mentioned implementation
Cathode pole piece prepared by example two is wound into battery core, then battery core is packed into battery case, in battery case after vacuum drying
Interior injection electrolyte, is finally sealed, and stands a period of time, obtains lithium ion battery.
As shown in table 2, it is the discharge data of the lithium ion battery that is prepared using embodiment two at -40 DEG C, electric discharge is again
Rate is 0.2C.From Table 2, it can be seen that when discharge-rate is 0.2C, discharge capacity decays to 80.0% correspondence of initial capacity
Cycle-index be 1008 times, illustrate using embodiment two preparation lithium ion battery can be worked normally in a low temperature of -40 DEG C
And there is longer cycle life.
Discharge data of the lithium ion battery that table 2 is prepared using embodiment two at -40 DEG C
| Cycle-index | Discharge capacity (mAh) | Capacity retention ratio (%) |
| 1st time | 1836.1 | 100.0% |
| 200th time | 1794.7 | 97.7% |
| 400th time | 1746.2 | 95.1% |
| 600th time | 1685.4 | 91.8% |
| 800th time | 1581.9 | 86.2% |
| 1000th time | 1481.2 | 80.7% |
| 1008th time | 1469.5 | 80.0% |
Embodiment three：
Prepare anode sizing agent：Positive active material selects LiMn2O4, rare earth richness magnesium-based powder to select scandium oxide and magnesia
Mixed powder, and the mass ratio of scandium oxide and magnesia be 2:1, the first conductive agent is the mixed powder of graphene and carbon nanotube
Body, and graphene and the mass ratio of carbon nanotube are 2:1, first binder is Kynoar, and the first solvent is N- methyl pyrroles
Pyrrolidone, and the quality of the positive active material, rare earth richness magnesium-based powder, the first conductive agent and first binder in embodiment three
Than being 90:2:1:7, by positive active material, rare earth richness magnesium-based powder, the first conductive agent and the first binder in embodiment three
It is mixed, and is stirred evenly to get to anode sizing agent with N-Methyl pyrrolidone.
Prepare anode pole piece：The two of plus plate current-collecting body will be uniformly coated in using the anode sizing agent prepared in embodiment three
Face so that one side applies charge level density is 180g/m2, then anode pole piece is dried, N-Methyl pyrrolidone is made to volatilize completely, then
It is cut out according to pre-set dimension, and the anode pole piece after roll-in is finally positioned in vacuum drying oven by roll-in to preset thickness
Drying, obtains anode pole piece.
Prepare negative electrode slurry：It is graphene and carbon nanometer that negative electrode active material, which selects carbonaceous mesophase spherules, the second conductive agent,
The mixed powder of pipe, and graphene and the mass ratio of carbon nanotube are 2:1, the second binder is Kynoar, the second solvent
The mass ratio of negative electrode active material, the second conductive agent, the second binder for N-Methyl pyrrolidone, and in embodiment three is
90:1:9, negative electrode active material, the second conductive agent, the second binder and the N-Methyl pyrrolidone in embodiment three are mixed
It closes, and stirs evenly to get to negative electrode slurry.
Prepare cathode pole piece：To negative current collector be uniformly coated in using the negative electrode slurry prepared in above-described embodiment three
Two sides, then cathode pole piece is dried, N-Methyl pyrrolidone is made to volatilize completely, is cut out according still further to pre-set dimension, and
Cathode pole piece after roll-in is finally positioned in vacuum drying oven and dries, obtain cathode pole piece to preset thickness by roll-in.
The preparation of lithium ion battery：By the anode pole piece prepared using above-described embodiment three, diaphragm and use above-mentioned implementation
Cathode pole piece prepared by example three is wound into battery core, then battery core is packed into battery case, in battery case after vacuum drying
Interior injection electrolyte, is finally sealed, and stands a period of time, obtains lithium ion battery.
As shown in table 3, it is the discharge data of the lithium ion battery that is prepared using embodiment three at -40 DEG C, electric discharge is again
Rate is 0.2C.From table 3 it is observed that when discharge-rate is 0.2C, discharge capacity decays to 80.1% correspondence of initial capacity
Cycle-index be 1011 times, illustrate using embodiment three preparation lithium ion battery can be worked normally in a low temperature of -40 DEG C
And there is longer cycle life.
Discharge data of the lithium ion battery that table 3 is prepared using embodiment three at -40 DEG C
| Cycle-index | Discharge capacity (mAh) | Capacity retention ratio (%) |
| 1st time | 1826.6 | 100.0% |
| 200th time | 1782.8 | 97.6% |
| 400th time | 1748.3 | 95.7% |
| 600th time | 1683.2 | 92.1% |
| 800th time | 1582.2 | 86.6% |
| 1000th time | 1485.9 | 81.3% |
| 1011st time | 1462.8 | 80.1% |
Example IV：
Prepare anode sizing agent：Positive active material selects cobalt acid lithium, rare earth richness magnesium-based powder to select scandium oxide and magnesia
Mixed powder, and the mass ratio of scandium oxide and magnesia be 2:1, the first conductive agent is the mixed powder of graphene and carbon nanotube
Body, and graphene and the mass ratio of carbon nanotube are 2:1, first binder is Kynoar, and the first solvent is N- methyl pyrroles
Pyrrolidone, and the quality of the positive active material, rare earth richness magnesium-based powder, the first conductive agent and first binder in example IV
Than being 91:2:2:5, by positive active material, rare earth richness magnesium-based powder, the first conductive agent and the first binder in example IV
It is mixed, and is stirred evenly to get to anode sizing agent with N-Methyl pyrrolidone.
Prepare anode pole piece：The two of plus plate current-collecting body will be uniformly coated in using the anode sizing agent prepared in example IV
Face so that one side applies charge level density is 180g/m2, then anode pole piece is dried, N-Methyl pyrrolidone is made to volatilize completely, then
It is cut out according to pre-set dimension, and the anode pole piece after roll-in is finally positioned in vacuum drying oven by roll-in to preset thickness
Drying, obtains anode pole piece.
Prepare negative electrode slurry：It is graphene and carbon nanotube that negative electrode active material, which selects artificial graphite, the second conductive agent,
Mixed powder, and graphene and the mass ratio of carbon nanotube are 2:1, the second binder is Kynoar, and the second solvent is N-
Methyl pyrrolidone, and the mass ratio of negative electrode active material in example IV, the second conductive agent, the second binder is 91:1:
8, negative electrode active material, the second conductive agent, the second binder in example IV are mixed with N-Methyl pyrrolidone, and
It stirs evenly to get to negative electrode slurry.
Prepare cathode pole piece：To negative current collector be uniformly coated in using the negative electrode slurry prepared in above-described embodiment four
Two sides, then cathode pole piece is dried, N-Methyl pyrrolidone is made to volatilize completely, is cut out according still further to pre-set dimension, and
Cathode pole piece after roll-in is finally positioned in vacuum drying oven and dries, obtain cathode pole piece to preset thickness by roll-in.
The preparation of lithium ion battery：By the anode pole piece prepared using above-described embodiment four, diaphragm and use above-mentioned implementation
Cathode pole piece prepared by example four is wound into battery core, then battery core is packed into battery case, in battery case after vacuum drying
Interior injection electrolyte, is finally sealed, and stands a period of time, obtains lithium ion battery.
As shown in table 4, it is the discharge data of the lithium ion battery that is prepared using example IV at -40 DEG C, electric discharge is again
Rate is 0.2C.As can be seen from Table 4, when discharge-rate is 0.2C, discharge capacity decays to 80.0% correspondence of initial capacity
Cycle-index be 832 times, illustrate using example IV preparation lithium ion battery can be worked normally simultaneously in a low temperature of -40 DEG C
With longer cycle life.
Discharge data of the lithium ion battery that table 4 is prepared using example IV at -40 DEG C
| Cycle-index | Discharge capacity (mAh) | Capacity retention ratio (%) |
| 1st time | 1855.7 | 100.0% |
| 200th time | 1784.8 | 96.2% |
| 400th time | 1708.5 | 92.1% |
| 600th time | 1619.4 | 87.3% |
| 800th time | 1521.1 | 82.0% |
| 832nd time | 1484.7 | 80.0% |
Embodiment five：
Prepare anode sizing agent：Positive active material selects LiMn2O4, rare earth richness magnesium-based powder to select scandium oxide and magnesia
Mixed powder, and the mass ratio of scandium oxide and magnesia be 2:1, the first conductive agent is the mixed powder of graphene and carbon nanotube
Body, and graphene and the mass ratio of carbon nanotube are 2:1, first binder is Kynoar, and the first solvent is N- methyl pyrroles
Pyrrolidone, and the quality of the positive active material, rare earth richness magnesium-based powder, the first conductive agent and first binder in embodiment five
Than being 91:2:2:5, by positive active material, rare earth richness magnesium-based powder, the first conductive agent and the first binder in embodiment five
It is mixed, and is stirred evenly to get to anode sizing agent with N-Methyl pyrrolidone.
Prepare anode pole piece：The two of plus plate current-collecting body will be uniformly coated in using the anode sizing agent prepared in embodiment five
Face so that one side applies charge level density is 190g/m2, then anode pole piece is dried, N-Methyl pyrrolidone is made to volatilize completely, then
It is cut out according to pre-set dimension, and the anode pole piece after roll-in is finally positioned in vacuum drying oven by roll-in to preset thickness
Drying, obtains anode pole piece.
Prepare negative electrode slurry：It is graphene and carbon nanometer that negative electrode active material, which selects carbonaceous mesophase spherules, the second conductive agent,
The mixed powder of pipe, and graphene and the mass ratio of carbon nanotube are 2:1, the second binder is Kynoar, the second solvent
The mass ratio of negative electrode active material, the second conductive agent, the second binder for N-Methyl pyrrolidone, and in embodiment five is
91:1:8, negative electrode active material, the second conductive agent, the second binder and the N-Methyl pyrrolidone in embodiment five are mixed
It closes, and stirs evenly to get to negative electrode slurry.
Prepare cathode pole piece：To negative current collector be uniformly coated in using the negative electrode slurry prepared in above-described embodiment five
Two sides, then cathode pole piece is dried, N-Methyl pyrrolidone is made to volatilize completely, is cut out according still further to pre-set dimension, and
Cathode pole piece after roll-in is finally positioned in vacuum drying oven and dries, obtain cathode pole piece to preset thickness by roll-in.
The preparation of lithium ion battery：By the anode pole piece prepared using above-described embodiment five, diaphragm and use above-mentioned implementation
Cathode pole piece prepared by example five is wound into battery core, then battery core is packed into battery case, in battery case after vacuum drying
Interior injection electrolyte, is finally sealed, and stands a period of time, obtains lithium ion battery.
As shown in table 5, it is the discharge data of the lithium ion battery that is prepared using embodiment five at -40 DEG C, electric discharge is again
Rate is 0.2C.As can be seen from Table 5, when discharge-rate is 0.2C, discharge capacity decays to 80.1% correspondence of initial capacity
Cycle-index be 856 times, illustrate using embodiment five preparation lithium ion battery can be worked normally simultaneously in a low temperature of -40 DEG C
With longer cycle life.
Discharge data of the lithium ion battery that table 5 is prepared using embodiment five at -40 DEG C
| Cycle-index | Discharge capacity (mAh) | Capacity retention ratio (%) |
| 1st time | 1870.4 | 100.0% |
| 200th time | 1821.3 | 97.4% |
| 400th time | 1763.9 | 94.3% |
| 600th time | 1674.1 | 89.5% |
| 800th time | 1563.3 | 83.6% |
| 856th time | 1498.7 | 80.1% |
The present invention provides a kind of ultralow temperature extended-life lithium ion batteries, are added in the anode sizing agent of anode pole piece dilute
Native richness magnesium-based powder, and using Kynoar as first binder and the second binder, and by the one side applies of anode pole piece
Charge level density is limited to 175g/m2~190g/m2, using graphene and the mixed powder of carbon nanotube as the first conductive agent and
Second conductive agent makes lithium ion battery that can be worked normally under -40 DEG C of low temperature environment and has longer cycle life, that is, carries
The high low temperature and ultralow temperature cycle performance of lithium ion battery, expands lithium ion battery in aerospace, military project, electric vehicle etc.
The application range in field.
Finally illustrate, the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although with reference to compared with
Good embodiment describes the invention in detail, it will be understood by those of ordinary skill in the art that, it can be to the skill of the present invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the right of invention.
Claims (8)
1. a kind of ultralow temperature extended-life lithium ion battery, including battery case and the positive pole in the battery case
Piece, cathode pole piece and electrolyte are provided with diaphragm between the anode pole piece and the cathode pole piece, it is characterised in that：Also wrap
It includes：The anode pole piece includes plus plate current-collecting body and the anode sizing agent coated in the plus plate current-collecting body two sides, the cathode pole
Piece includes negative current collector and the negative electrode slurry coated in the negative current collector two sides；
The anode sizing agent includes the first solvent, rare earth richness magnesium-based powder, positive active material, the first conductive agent and the first bonding
Agent, and the one side applies charge level density of the anode pole piece is 175g/m2~190g/m2, the quality of the rare earth richness magnesium-based powder matches
Than being 1%~5%, the quality proportioning of the positive active material is 90%~95%, the quality proportioning of first conductive agent
It is 1%~5%, the quality proportioning of the first binder is 3%~8%；
The negative electrode slurry includes the second solvent, negative electrode active material, the second conductive agent and the second binder, the negative electrode active
The quality proportioning of substance is 90%~94%, and the quality proportioning of second conductive agent is 1%~5%, second binder
Quality proportioning be 5%~10%.
2. a kind of ultralow temperature extended-life lithium ion battery according to claim 1, it is characterised in that：The positive electrode active material
Matter includes at least LiMn2O4, LiFePO4, cobalt acid lithium, lithium-rich manganese base material Li (LixM1-x)O2, nickel cobalt aluminium ternary material and nickel cobalt
One kind in manganese ternary material.
3. a kind of ultralow temperature extended-life lithium ion battery according to claim 1, it is characterised in that：The rare earth richness magnesium-based
Powder be scandium oxide, yttrium oxide, lanthana, cerium oxide, praseodymium oxide, ytterbium oxide, titanium oxide, one or more of zirconium oxide with
The mixed powder of magnesia.
4. a kind of ultralow temperature extended-life lithium ion battery according to claim 1, it is characterised in that：First conductive agent
For the mixed powder of graphene and carbon nanotube.
5. a kind of ultralow temperature extended-life lithium ion battery according to claim 1, it is characterised in that：First solvent is
N-Methyl pyrrolidone, the first binder are Kynoar.
6. a kind of ultralow temperature extended-life lithium ion battery according to claim 1, it is characterised in that：The negative electrode active material
Matter includes at least one kind in natural graphite, carbonaceous mesophase spherules and artificial graphite.
7. a kind of ultralow temperature extended-life lithium ion battery according to claim 1, it is characterised in that：Second conductive agent
For the mixed powder of graphene and carbon nanotube.
8. a kind of ultralow temperature extended-life lithium ion battery according to claim 1, it is characterised in that：Second solvent is
N-Methyl pyrrolidone, second binder are Kynoar.
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| CN201810134604.3A CN108321429A (en) | 2018-02-09 | 2018-02-09 | A kind of ultralow temperature extended-life lithium ion battery |
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| CN201810134604.3A CN108321429A (en) | 2018-02-09 | 2018-02-09 | A kind of ultralow temperature extended-life lithium ion battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109256589A (en) * | 2018-09-20 | 2019-01-22 | 山东天瀚新能源科技有限公司 | A kind of ultralow temperature rate lithium ion battery |
| CN110010898A (en) * | 2019-04-16 | 2019-07-12 | 江苏碳谷二维世界科技有限公司 | A kind of graphene cathode of lithium battery slurry, preparation method and fast charge lithium ion battery |
| CN114614013A (en) * | 2022-03-21 | 2022-06-10 | 柳州鹏辉能源科技有限公司 | Lithium ion battery composite additive, positive electrode slurry, preparation method of positive electrode slurry, positive electrode plate and electric equipment |
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| CN106935859A (en) * | 2017-02-17 | 2017-07-07 | 中国科学院西安光学精密机械研究所 | A kind of novel rare-earth richness magnesium-based lithium-ion-power cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109256589A (en) * | 2018-09-20 | 2019-01-22 | 山东天瀚新能源科技有限公司 | A kind of ultralow temperature rate lithium ion battery |
| CN110010898A (en) * | 2019-04-16 | 2019-07-12 | 江苏碳谷二维世界科技有限公司 | A kind of graphene cathode of lithium battery slurry, preparation method and fast charge lithium ion battery |
| CN110010898B (en) * | 2019-04-16 | 2022-02-18 | 江苏碳谷二维世界科技有限公司 | Graphene lithium battery negative electrode slurry, preparation method and quick-charging lithium ion battery |
| CN114614013A (en) * | 2022-03-21 | 2022-06-10 | 柳州鹏辉能源科技有限公司 | Lithium ion battery composite additive, positive electrode slurry, preparation method of positive electrode slurry, positive electrode plate and electric equipment |
| CN114614013B (en) * | 2022-03-21 | 2023-12-22 | 柳州鹏辉能源科技有限公司 | Lithium ion battery composite additive, positive electrode slurry, preparation method of positive electrode slurry, positive electrode plate and electric equipment |
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