CN110350197A - Conductive agent, based lithium-ion battery positive plate and preparation method thereof, lithium ion battery - Google Patents
Conductive agent, based lithium-ion battery positive plate and preparation method thereof, lithium ion battery Download PDFInfo
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- H—ELECTRICITY
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
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Abstract
The invention discloses conductive agent, based lithium-ion battery positive plate and preparation method thereof, lithium ion battery, wherein conductive agent by weight percentage, including carbon nanotube 0.4%-5%, solvent 94.0%-98% and dispersing agent 1%-2%；The caliber of the carbon nanotube is 1-10nm, length 30-70nm.The present invention provides a kind of conductive agent, utilize lithium ion anode piece made of the conductive agent and the lithium ion battery comprising above-mentioned positive plate, conductive agent in the present invention is the carbon nano tube paste formed by the carbon nanotube of specific proportion, solvent and dispersing agent, on the one hand, improve pole piece conductivity, polarization resistance is reduced, improves the high rate capability of lithium ion battery, while also promoting normal-temperature circulating performance, even if under the high temperature conditions, cycle performance is also improved；On the other hand the usage amount for reducing conductive agent, improves activity substance content, battery capacity is improved under the premise of not changing battery system；On the other hand, so that carbon nanotube has been obtained good dispersion, and shorten and disperse the compound time.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly to conductive agent, based lithium-ion battery positive plate and its
Preparation method, lithium ion battery.
Background technique
As the development of lithium ion battery science and technology and energy crisis and environmental problem are got worse, in recent years,
The energy density and power density of lithium ion battery Yin Qigao has obtained extensive research in terms of electric car, electric tool
And application.
Since current commercial Li-ion positive electrode is mainly semiconductor material, electric conductivity is poor, to reduce lithium ion
The polarization resistance of battery in the manufacturing process of based lithium-ion battery positive plate, can generally add conductive agent.Conductive black or conductive stone
Ink is to use relatively broad conductive agent at present, but its use in positive plate of lithium battery is higher, reduces positive electrode
Use mass percent.Carbon nanotube CNTs has excellent electric conductivity, as lithium-ion electric as monodimension nanometer material
The positive conductive agent in pond can build " line " shape conductive network, hence it is evident that reduce the internal resistance of cell, promote the multiplying power of lithium ion battery；
On the other hand, low usage amount can be improved the mass percent of positive electrode, be promoted under the premise of not changing battery system
The capacity of battery.It is generally that conductive agent and positive main material is dry-mixed but in positive electrode homogenization process；But dry powder-shaped CNTs
Using same dispersing technology and equipment, it is easy to reunite, it is difficult to disperse, electric conductivity is greatly lowered.
In order to solve drawbacks described above, CN107681157A discloses a kind of single-walled carbon nanotube slurry, including single wall carbon is received
Mitron 0.01%-10%, solvent 90%-100% and dispersing agent 0.01%-10%；The single-walled carbon nanotube caliber that is averaged is
0.1-3.0nm, length are 1-50 μm；Also disclose a kind of lithium ion cell positive, including positive electrode active materials, conductive agent and viscous
Agent is connect, the conductive agent uses above-mentioned single-walled carbon nanotube；The bonding agent is polyvinylidene fluoride, the positive-active material
Material is using one or more of cobalt acid lithium, LiMn2O4, LiFePO4 and ternary material；The preparation of the lithium ion cell positive
Method including the following steps: step A: bonding agent is dissolved in solvent, and single wall as described in claim 1 is then added
Carbon nano tube paste mixing, obtains mixed solution；Step B: positive electrode active materials are added into mixed solution and obtain anode sizing agent；
Step C: anode sizing agent is coated in aluminum foil current collector, drying, roll-in and cuts to obtain lithium ion cell positive.
But present inventor has found that above-mentioned technology at least has following skill during realizing the embodiment of the present application
Art problem: the normal-temperature circulating performance and high temperature cyclic performance of battery are poor, need further improvement.
Summary of the invention
In order to make up the defect of prior art, the present invention provide conductive agent, based lithium-ion battery positive plate and preparation method thereof,
Lithium ion battery.
The technical problems to be solved by the invention are achieved by the following technical programs:
A kind of conductive agent, by weight percentage, including carbon nanotube 0.4%-5%, solvent 94.0%-98% and dispersing agent 1%-2%；Institute
The caliber for stating carbon nanotube is 1-10nm, length 30-70nm.
Further, the solvent is N-Methyl pyrrolidone.
Further, the dispersing agent be polyvinylidene fluoride or one of polyvinylpyrrolidone and its modifier or
It is several.
Based lithium-ion battery positive plate, the anode slurry including plus plate current-collecting body and coated in the plus plate current-collecting body surface
Material, the material of the anode sizing agent described by weight percentage includes positive electrode active materials 97.37%-98.6%, conductive agent 0.05%-
0.5%, bonding agent 1%-2.4%.
Further, the positive electrode active materials are ternary material LiNixCoyMn1-x-yO2.
Further, the bonding agent is Kynoar.
The preparation method of based lithium-ion battery positive plate, includes the following steps:
S1. bonding agent is dissolved in solvent, above-mentioned conductive agent mixing is then added, stirring obtains mixed solution A；
S2. the mixed solution A for weighing 70% by mass percentage is added in positive electrode active materials and obtains anode sizing agent B, stirring
90min；
S3. it by the mixed solution A of residue 30%, is added in anode sizing agent B, stirs 90min, obtain anode sizing agent C；
S4. anode sizing agent C is applied on plus plate current-collecting body, drying, roll-in and cuts to obtain based lithium-ion battery positive plate.
A kind of lithium ion battery, including positive plate, negative electrode tab, battery diaphragm and electrolyte, the positive plate be it is above-mentioned just
Pole piece.
The invention has the following beneficial effects:
Present inventor is in order to realize that the improvement of the normal-temperature circulating performance and high temperature cyclic performance of battery has carried out various depths
Enter research, as a result, it has been found that, the key factor of the normal-temperature circulating performance and high temperature cyclic performance that influence battery is carbon nanotube
Dosage and length, inventors be surprised to learn that, the dosage by carbon nanotube in control conductive agent is 0.4%-5%, the carbon nanometer
The length of pipe is 30-70nm, achieves unexpected technical effect, the normal-temperature circulating performance and high temperature cyclic performance of battery have
Highly significant raising.
The present invention provides a kind of conductive agent, using lithium ion anode piece made of the conductive agent and include above-mentioned anode
The lithium ion battery of piece, the present invention in conductive agent be that the carbon formed by the carbon nanotube of specific proportion, solvent and dispersing agent is received
Mitron slurry, on the one hand, improve pole piece conductivity, reduce polarization resistance, improve the high rate capability of lithium ion battery, together
When also promote normal-temperature circulating performance, even if under the high temperature conditions, cycle performance is also improved；On the other hand conduction is reduced
The usage amount of agent, improves activity substance content, and battery capacity is improved under the premise of not changing battery system；Another party
Face makes carbon nanotube obtain good dispersion, and shortens and disperse the compound time, reduces energy consumption, reduces production cost, mentions
High production efficiency.
The good cycle of lithium ion battery of the invention, under the charge-discharge magnification of+0.5C/-1C, 25 DEG C of normal temperature conditions
After lower circulation 500 times, capacity retention ratio is greater than 94%；After recycling 500 times under 45 DEG C of hot conditions, capacity retention ratio is greater than
82%, thus fundamentally solving the problems, such as that cycle performance is poor.
In the preparation of traditional based lithium-ion battery positive plate, the mixed solution that binder and conductive agent are formed once is added
Anode sizing agent is obtained into positive electrode active materials, then anode sizing agent is applied on plus plate current-collecting body, and the present invention creatively will
The lithium ion for obtaining anode sizing agent, obtaining is added portionwise in positive electrode active materials in the mixed solution that binder and conductive agent are formed
The cycle performance of battery is more preferable.
Specific embodiment
Unless otherwise specified, the meaning phase that the meaning of the term in this specification is commonly understood by with those skilled in the art
Together, but if any conflict, then the definition in this specification shall prevail.
Unless otherwise specified, the percentage in this specification (%) is weight percentage (weight %).
All numerical value for being related to group component, process conditions etc. that use in the specification and in the claims are expressed in institute
Have in situation it should be understood that being modified by " about ".All ranges for being related to same composition or property include endpoint, which can be only
On the spot combine.Since these ranges are continuously, they include each numerical value between a minimum and a maximum value.Also answer
Understand, the expected all subranges including within the scope of this of any numberical range of the application reference.
Herein "include", "comprise", " containing ", " containing ", " having " or other variants be intended to it is non-enclosed include,
It is not distinguished between these terms.Term "comprising", which refers to, can be added not the other steps for influencing final result and ingredient.Term
"comprising" further includes term " Consists of " and "consisting essentially of ...".The compositions and methods of the invention/technique may include,
It is made from it and substantially by essential elements described herein and limit entry and described herein any additional or optional
Ingredient, component, step or limit entry composition.
Starting point of the invention is to be adjusted by special technological design and formula, makes one on the basis of existing technology
Kind solves carbon nanometer using lithium ion battery of the carbon nanotube as the based lithium-ion battery positive plate of conductive agent and containing this positive plate
The problem of pipe difficulty is dispersed, and improve the cycle performance of lithium ion battery, effectively improve the safety in utilization of battery.
In a first aspect, the present invention provides a kind of conductive agent, by weight percentage, including carbon nanotube 0.4%-5%, solvent
94.0%-98% and dispersing agent 1%-2%；The caliber of the carbon nanotube is 1-10nm, length 30-70nm.
Present inventor is in order to realize that the improvement of the normal-temperature circulating performance and high temperature cyclic performance of battery has carried out respectively
Kind further investigation, as a result, it has been found that, the key factor of the normal-temperature circulating performance and high temperature cyclic performance that influence battery is carbon nanometer
The dosage and length of pipe, inventors be surprised to learn that, the dosage by carbon nanotube in control conductive agent is 0.4%-5%, the carbon
The length of nanotube is 30-70nm, achieves unexpected technical effect, the normal-temperature circulating performance and high temperature circulation of battery
Can have and its significantly improve.
Inventors have found that mass percentage content control of the above-mentioned carbon nanotube in conductive agent is in R&D process
0.4%-5% is advisable, and the caliber of the carbon nanotube is 1-10nm, and length is advisable for 30-70nm, if not according to these be formulated into
Row proportion, obtained lithium ion battery will be unable to obtain satisfactory normal-temperature circulating performance and high temperature cyclic performance.
The weight percent of the carbon nanotube be 0.4%-5%, may be, for example, 0.4%, 1%, 2%, 3%, 4%, 5% or these
The interval range that numerical value is formed.
The weight percent of the solvent is 94.0%-98%, may be, for example, 94%, 95%, 96%, 97%, 98% or these numbers
It is worth the interval range formed.
The weight percent of the dispersing agent be 1%-2%, may be, for example, 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2% or this
The interval range that a little numerical value are formed.
The length of the carbon nanotube be 30-70nm, such as can be 39nm, 40nm, 45nm, 50nm, 60nm, 70nm,
Or the interval range that these numerical value are formed.
The solvent is preferred but is not limited to N-Methyl pyrrolidone.
The dispersing agent preferably but be not limited in polyvinylidene fluoride or polyvinylpyrrolidone and its modifier one
Kind is several.
Second aspect, the present invention provide a kind of based lithium-ion battery positive plate, based lithium-ion battery positive plate, including anode collection
Body and anode sizing agent coated in the plus plate current-collecting body surface, the material of the anode sizing agent described by weight percentage include just
Pole active material 97.37%-98.6%, conductive agent 0.05%-0.5%, bonding agent 1%-2.4%.
The positive electrode active materials are preferred but are not limited to ternary material LiNixCoyMn1-x-yO2。
The bonding agent is preferred but is not limited to Kynoar.
The third aspect, the present invention provide the preparation method of above-mentioned based lithium-ion battery positive plate, include the following steps:
S1. bonding agent is dissolved in solvent, above-mentioned conductive agent mixing is then added, stirring obtains mixed solution A；
S2. the mixed solution A for weighing 70% by mass percentage is added in positive electrode active materials and obtains anode sizing agent B, stirring
90min；
S3. it by the mixed solution A of residue 30%, is added in anode sizing agent B, stirs 90min, obtain anode sizing agent C；
S4. anode sizing agent C is applied on plus plate current-collecting body, drying, roll-in and cuts to obtain based lithium-ion battery positive plate.
In the preparation of traditional based lithium-ion battery positive plate, the mixed solution that binder and conductive agent are formed once is added
Anode sizing agent is obtained into positive electrode active materials, then anode sizing agent is applied on plus plate current-collecting body, and the present invention is creatively first
The mixed solution A for weighing 70% by mass percentage is added in positive electrode active materials and obtains anode sizing agent B, it is thus obtained just
Pole slurry B；It again by the mixed solution A of residue 30%, is added in anode sizing agent B, stirs 90min, obtain anode sizing agent C, pass through
The mixed solution that binder and conductive agent are formed is added portionwise in positive electrode active materials, and the mixing that control is added portionwise is molten
The amount of liquid facilitates conductive agent and is uniformly dispersed, and constructs good conductive network, electrolyte infiltration is uniform, obtained lithium ion
The cycle performance of battery is more preferable.
Fourth aspect, the present invention provide a kind of lithium ion battery, including positive plate, negative electrode tab, battery diaphragm and electrolyte,
The positive plate is above-mentioned based lithium-ion battery positive plate.
The present invention will now be described in detail with reference to examples, and the examples are only preferred embodiments of the present invention,
It is not limitation of the invention.
Embodiment 1
A kind of lithium ion battery, preparation method are as follows:
(1) conductive agent is prepared
20g Kynoar (PVDF) is added in 976g N-Methyl pyrrolidone, 40min is to being completely dissolved for stirring；Then
4g carbon nanotube powder is added, wherein the caliber of carbon nanotube is 1-4nm, and pipe range 30-40nm, high speed dispersion 2h are led
Electric agent；
(2) based lithium-ion battery positive plate is prepared
The based lithium-ion battery positive plate includes plus plate current-collecting body and the anode sizing agent coated in the plus plate current-collecting body surface,
The material of the anode sizing agent described by weight percentage includes positive electrode active materials 98%, conductive agent 0.08%, bonding agent 1.4%；
The preparation method comprises the following steps:
S1. bonding agent is dissolved in N-Methyl pyrrolidone, conductive agent mixing is then added, stirring obtains mixed solution A；
S2. the mixed solution A for weighing 70% by mass percentage is added in positive electrode active materials and obtains anode sizing agent B, stirring
90min；
S3. it by the mixed solution A of residue 30%, is added in anode sizing agent B, stirs 90min, obtain anode sizing agent C；
S4. anode sizing agent C is subjected on the aluminium foil with a thickness of 15.5um double spread, is dried at 100 DEG C, carried out
Compacting, compacted density 3.4g/cm3, pole piece is then cut into 624mm(length) and * 57mm(width) * 0.146mm(thickness
Degree) specification, soldering polar ear obtains based lithium-ion battery positive plate；
(3) lithium ion battery is prepared
The conventional natural graphite of anode plate for lithium ionic cell selection: silicon-carbon: carbon black: CMC:SBR=90:10:0.5:1.09:2.1
Ratio prepare slurry, and coated, drying, roll-in and cutting are made；Diaphragm selects 18um polyethylene diagrams (U.S. celgad
Company's production)；The conventional electrolyte (1mol/L LiPF6, solvent EC:EMC:PC=20:70:10) of electrolyte selection；Shell choosing
Select 18650 type cylindrical steel shells.The core that above-mentioned positive plate, negative electrode tab and membrane winding are formed to a cylinder, is assemblied in 18650
On shell body, 5.6g electrolyte is injected in battery；Subsequent aged, aging partial volume obtains the 18650 type batteries of 2750mAh
S1, wherein digestion time is for 24 hours.
Embodiment 2
(1) conductive agent is prepared
10g polyvinylpyrrolidone (PVP) is added in 950g N-Methyl pyrrolidone, 90min is to being completely dissolved for stirring；
Then be added 40g carbon nanotube powder, wherein the caliber of carbon nanotube be 5-10nm, pipe range 50-70nm, high speed dispersion 2h,
Obtain conductive agent；
(2) based lithium-ion battery positive plate is prepared
The based lithium-ion battery positive plate includes plus plate current-collecting body and the anode sizing agent coated in the plus plate current-collecting body surface,
The material of the anode sizing agent described by weight percentage includes positive electrode active materials 97.37%, conductive agent 0.05%, bonding agent 2.4%；
The preparation method comprises the following steps:
S1. bonding agent is dissolved in N-Methyl pyrrolidone, conductive agent mixing is then added, stirring obtains mixed solution A；
S2. the mixed solution A for weighing 70% by mass percentage is added in positive electrode active materials and obtains anode sizing agent B, stirring
90min；
S3. it by the mixed solution A of residue 30%, is added in anode sizing agent B, stirs 90min, obtain anode sizing agent C；
S4. anode sizing agent C is subjected on the aluminium foil with a thickness of 15.5um double spread, is dried at 100 DEG C, carried out
Compacting, compacted density 3.4g/cm3, pole piece is then cut into 630mm(length) and * 57mm(width) * 0.147mm(thickness
Degree) specification, soldering polar ear obtains based lithium-ion battery positive plate；
(3) lithium ion battery is prepared
The conventional natural graphite of negative electrode of lithium ion battery selection: silicon-carbon: carbon black: CMC:SBR=90:10:0.5:1.09:2.1's
Ratio prepares slurry, and coated, drying, and roll-in and cutting are made；Diaphragm selects 18um polyethylene diagrams, and (U.S. celgad is public
Department's production)；The conventional electrolyte (1mol/L LiPF6, solvent EC:EMC:PC=20:70:10) of electrolyte selection；Shell selection
18650 type cylindrical steel shells.Above-mentioned the positive electrode, the negative electrode and the separator is wound to the core to form a cylinder, is assemblied in 18650 shell bodies
On, 5.6g electrolyte is injected in battery, subsequent aged aging partial volume obtains the 18650 type battery S2 of 2750mAh, wherein
Digestion time is for 24 hours.
Embodiment 3
(1) conductive agent is prepared
15g polyvinylpyrrolidone (PVP) is added in 940g N-Methyl pyrrolidone, 90min is to being completely dissolved for stirring；
Then be added 45g carbon nanotube powder, wherein the caliber of carbon nanotube be 5-10nm, pipe range 50-70nm, high speed dispersion 2h,
Obtain conductive agent；
(2) based lithium-ion battery positive plate is prepared
The based lithium-ion battery positive plate includes plus plate current-collecting body and the anode sizing agent coated in the plus plate current-collecting body surface,
The material of the anode sizing agent described by weight percentage includes positive electrode active materials 98.6%, conductive agent 0.4%, bonding agent 1%；
The preparation method comprises the following steps:
S1. bonding agent is dissolved in N-Methyl pyrrolidone, conductive agent mixing is then added, stirring obtains mixed solution A；
S2. the mixed solution A for weighing 70% by mass percentage is added in positive electrode active materials and obtains anode sizing agent B, stirring
90min；
S3. it by the mixed solution A of residue 30%, is added in anode sizing agent B, stirs 90min, obtain anode sizing agent C；
S4. anode sizing agent C is subjected on the aluminium foil with a thickness of 15.5um double spread, is dried at 100 DEG C, carried out
Compacting, compacted density 3.4g/cm3, pole piece is then cut into 630mm(length) and * 57mm(width) * 0.147mm(thickness
Degree) specification, soldering polar ear obtains based lithium-ion battery positive plate；
(3) lithium ion battery is prepared
The conventional natural graphite of negative electrode of lithium ion battery selection: silicon-carbon: carbon black: CMC:SBR=90:10:0.5:1.09:2.1's
Ratio prepares slurry, and coated, drying, and roll-in and cutting are made；Diaphragm selects 18um polyethylene diagrams, and (U.S. celgad is public
Department's production)；The conventional electrolyte (1mol/L LiPF6, solvent EC:EMC:PC=20:70:10) of electrolyte selection；Shell selection
18650 type cylindrical steel shells.Above-mentioned the positive electrode, the negative electrode and the separator is wound to the core to form a cylinder, is assemblied in 18650 shell bodies
On, 5.6g electrolyte is injected in battery, subsequent aged, aging partial volume obtains the 18650 type battery S3 of 2750mAh, wherein
Digestion time is for 24 hours.
Comparative example 1
It based on embodiment 1, the difference is that only: when preparing conductive agent, 20g Kynoar (PVDF) being added to 920g
In N-Methyl pyrrolidone, 40min is to being completely dissolved for stirring；Then 60g carbon nanotube powder is added, wherein the pipe of carbon nanotube
Diameter is 1-4nm, and pipe range 30-40nm, high speed dispersion 2h obtain conductive agent.
Comparative example 2
It based on embodiment 1, the difference is that only: when preparing conductive agent, 20g Kynoar (PVDF) being added to 977g
In N-Methyl pyrrolidone, 40min is to being completely dissolved for stirring；Then 3g carbon nanotube powder is added, wherein the pipe of carbon nanotube
Diameter is 1-4nm, and pipe range 30-40nm, high speed dispersion 2h obtain conductive agent.
Comparative example 3
It based on embodiment 2, the difference is that only: when preparing conductive agent, 10g polyvinylpyrrolidone (PVP) being added to
In 980g N-Methyl pyrrolidone, 90min is to being completely dissolved for stirring；Then 10g carbon nanotube powder is added, wherein carbon nanometer
The caliber of pipe is 1.5nm, and pipe range is 20 μm, and high speed dispersion 2h obtains conductive agent.
Comparative example 4
It based on embodiment 1, the difference is that only: when preparing conductive agent, 20g Kynoar (PVDF) being added to 976g
In N-Methyl pyrrolidone, 40min is to being completely dissolved for stirring；Then 4g carbon nanotube powder is added, wherein the pipe of carbon nanotube
Diameter is 1-4nm, and pipe range 20nm, high speed dispersion 2h obtain conductive agent.
Comparative example 5
It based on embodiment 1, the difference is that only: when preparing conductive agent, 20g Kynoar (PVDF) being added to 920g
In N-Methyl pyrrolidone, 40min is to being completely dissolved for stirring；Then 60g carbon nanotube powder is added, wherein the pipe of carbon nanotube
Diameter is 1-4nm, and pipe range is 1 μm, and high speed dispersion 2h obtains conductive agent.
Comparative example 6
It based on embodiment 1, the difference is that only: when preparing based lithium-ion battery positive plate, mixed solution A will be obtained and be once added
Anode sizing agent is obtained into positive electrode active materials.
Test example
Lithium ion battery made from embodiment 1-3 and comparative example 1-6 is subjected to normal-temperature circulating performance test and high temperature circulation respectively
Performance test, test result is referring to table 1.
Wherein, normal-temperature circulating performance is tested: with the electric current constant-current constant-voltage charging of 0.5C until voltage is under 25 DEG C of constant temperature
4.2V is repeated charge and discharge cycles 500 times then with 1C current discharge to 2.75V；The electric discharge that battery is recorded in cyclic process is held
Amount, using the 500th discharge capacity and first time discharge capacity percentage as capacity retention ratio.
High temperature cyclic performance test: under 45 DEG C of constant temperature with the electric current constant-current constant-voltage charging of 0.5C until voltage be 4.2V,
Then it with 1C current discharge to 2.75V, repeats charge and discharge cycles 500 times；The discharge capacity of battery is recorded in cyclic process, with the
500 discharge capacities and first time discharge capacity percentages are as capacity retention ratio.
| Number | Capacity retention ratio under room temperature | Capacity retention ratio at 45 DEG C |
| Embodiment 1 | 96% | 87% |
| Embodiment 2 | 95% | 85% |
| Embodiment 3 | 97% | 82% |
| Comparative example 1 | 75% | 62% |
| Comparative example 2 | 78% | 66% |
| Comparative example 3 | 77% | 68% |
| Comparative example 4 | 76% | 65% |
| Comparative example 5 | 72% | 60% |
| Comparative example 6 | 80% | 65% |
It can be seen that from contrast test, in the identical situation of other factors, the dosage of carbon nanotube is in conductive agent
The length of 0.4%-5%, the carbon nanotube are 30-70nm, achieve unexpected technical effect, the normal temperature circulation of battery
There can be highly significant raising with high temperature cyclic performance.
Embodiments of the present invention above described embodiment only expresses, the description thereof is more specific and detailed, but can not
Therefore limitations on the scope of the patent of the present invention are interpreted as, as long as skill obtained in the form of equivalent substitutions or equivalent transformations
Art scheme should all be fallen within the scope and spirit of the invention.
Claims (8)
1. a kind of conductive agent, which is characterized in that by weight percentage, including carbon nanotube 0.4%-5%, solvent 94.0%-98% and
Dispersing agent 1%-2%；Wherein, the caliber of the carbon nanotube is 1-10nm, length 30-70nm.
2. conductive agent as described in claim 1, which is characterized in that the solvent is N-Methyl pyrrolidone.
3. conductive agent as described in claim 1, which is characterized in that the dispersing agent is polyvinylidene fluoride or polyvinyl pyrrole
One or more of alkanone and its modifier.
4. a kind of based lithium-ion battery positive plate, which is characterized in that it include plus plate current-collecting body and be coated in the anode collection
The anode sizing agent in body surface face, the material of the anode sizing agent described by weight percentage include positive electrode active materials 97.37%-98.6%,
Conductive agent 0.05%-0.5%, bonding agent 1%-2.4%, wherein the conductive agent uses the described in any item conductions of claim 1-3
Agent.
5. based lithium-ion battery positive plate as claimed in claim 4, which is characterized in that the positive electrode active materials are ternary material
LiNixCoyMn1-x-yO2。
6. based lithium-ion battery positive plate as claimed in claim 4, which is characterized in that the bonding agent is Kynoar.
7. the preparation method of any one of the claim 4-6 based lithium-ion battery positive plate, includes the following steps:
S1. bonding agent is dissolved in solvent, above-mentioned conductive agent mixing is then added, stirring obtains mixed solution A；
S2. the mixed solution A for weighing 70% by mass percentage is added in positive electrode active materials and obtains anode sizing agent B, stirring
90min；
S3. it by the mixed solution A of residue 30%, is added in anode sizing agent B, stirs 90min, obtain anode sizing agent C；
S4. anode sizing agent C is applied on plus plate current-collecting body, drying, roll-in and cuts to obtain based lithium-ion battery positive plate.
8. a kind of lithium ion battery, including positive plate, negative electrode tab, battery diaphragm and electrolyte, which is characterized in that the positive plate
For the described in any item positive plates of claim 4-6.
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| CN115849345A (en) * | 2023-02-08 | 2023-03-28 | 中创新航科技股份有限公司 | Electrode material, positive plate using same and battery |
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Application publication date: 20191018 |