CN106099115B - Lithium ion battery combined conductive agent, lithium ion battery composite guide be electro-hydraulic and preparation method thereof, lithium ion battery - Google Patents
Lithium ion battery combined conductive agent, lithium ion battery composite guide be electro-hydraulic 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
- 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
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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
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
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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
Abstract
The invention discloses a kind of lithium ion battery combined conductive agent, lithium ion battery composite guide, electro-hydraulic and preparation method thereof, lithium ion battery, belongs to technical field of lithium ion.Lithium ion battery combined conductive agent of the invention includes the component of following parts by weight: 0.5-2 parts of 3- trimethyl-silane borate, 1-5 parts of conductive agent.Lithium ion battery of the invention is added to 3- trimethyl-silane borate with combined conductive agent, be conducive to the conduction of lithium ion during charge and discharge cycles, it is also beneficial to reduce the impedance of lithium ion battery, and then ensure that excellent cyclical stability, while can be very good to inhibit Fe again2+It is dissolved into electrolyte to improve the quality of SEI, and then can be improved the high temperature cyclic performance of lithium ion battery, have a good application prospect in field of lithium ion battery.
Description
Technical field
The present invention relates to a kind of lithium ion battery combined conductive agent, lithium ion battery composite guide is electro-hydraulic and its preparation side
Method, lithium ion battery, belong to technical field of lithium ion.
Background technique
In recent years, with the fast development of green energy resource industry, electrochemical energy storage technology is sent out in human society and life
Increasingly important role is waved, various electrochemical energy storing devices are in fields such as electric vehicle, energy storage, communication power supply and electronic products
Using also more and more extensive.Wherein, lithium ion battery is with energy density is big, power density is high, has extended cycle life, self-discharge rate
The many merits such as low and environmentally protective, become the hot spot of application.
But use environment is larger to the service life and its safety effects of lithium ion battery, high temperature will lead to lithium from
The decline of sub- battery performance, such as the cycle performance of lithium ion battery at high temperature.Battery generates larger in summer operational process
Ambient temperature is higher simultaneously for heat, causes its lithium ion battery to work under the high temperature conditions for a long time, will lead to lithium ion battery
Cycle life sharply decline and have an important influence on.
In order to improve the high temperature cyclic performance of lithium ion battery, in the prior art generally by using the side of high-temperature electrolyte
Formula, the Chinese invention patent if application publication number is CN104900915A disclose a kind of lithium-ion battery electrolytes and lithium ion
Battery, the electrolyte include carboxylate, sultones, dinitrile compound, and three kinds of compound synergistic effects can improve battery
High temperature circulation, high-temperature storage performance and high rate performance.But since the lithium ion battery is the side by using above-mentioned electrolyte
Formula improves high-temperature behavior, which influences the structure of the electrode material on battery pole piece smaller, and battery is in high temperature ring
During charge and discharge cycles under border, electrode material is still easy to change, and then cycle performance of battery is caused to decline.
Summary of the invention
The present invention provides a kind of lithium ion battery combined conductive agent that can be improved high-temperature lithium ion battery cycle performance.
It is electro-hydraulic and preparation method thereof the present invention also provides a kind of lithium ion battery composite guide, use the lithium of the electro-hydraulic preparation of the composite guide
Ion battery.
The technical solution that the present invention solves lithium ion battery combined conductive agent used by above-mentioned technical problem is as follows:
A kind of lithium ion battery combined conductive agent, the component including following parts by weight: 0.5-2 parts of 3- trimethyl-
Silane borate, 1-5 parts of conductive agent.
The lithium ion battery combined conductive agent further includes 5-15 parts of binder.The binder can be existing skill
Binder in art.Preferably, the binder is compound binding agent, and the compound binding agent is 4-6:5-9's by mass ratio
Sodium carboxymethylcellulose and sodium alginate composition.
The lithium ion battery combined conductive agent further includes 0.5-2 parts of film forming agent, and the film forming agent is perfluorinated sulfonic acid
Lithium, NaBF4One or both of.
The conductive agent can be conductive agent in the prior art.Preferably, conductive agent is amination graphene, amination
One or both of carbon nanotube.
The lithium ion battery is negative electrode of lithium ion battery conductive agent with combined conductive agent.
The electro-hydraulic technical solution of lithium ion battery composite guide is as follows:
A kind of lithium ion battery composite guide is electro-hydraulic, the component including following parts by weight: 0.5-2 parts of 3- trimethyl-
Silane borate, 1-5 parts of conductive agent, 5-15 parts of binder, 100 parts of solvents.
The solvent is one or both of the mixture of butyl acetate and butyl glycol ether, N-Methyl pyrrolidone.
The mixture of butyl acetate and butyl glycol ether is mixed to get by the butyl acetate that volume ratio is 1:1 and butyl glycol ether.
The binder can be binder in the prior art.Preferably, the binder is compound binding agent, described
Compound binding agent is made of the sodium carboxymethylcellulose that mass ratio is 4-6:5-9 and sodium alginate.
The lithium ion battery combined conductive agent further includes 0.5-2 parts of film forming agent, and the film forming agent is perfluorinated sulfonic acid
Lithium, NaBF4One or both of.
The conductive agent can be conductive agent in the prior art.Preferably, conductive agent is amination graphene, amination
One or both of carbon nanotube.
The lithium ion battery is negative electrode of lithium ion battery conductive agent with combined conductive agent.
The technical solution of the electro-hydraulic preparation method of lithium ion battery composite guide is as follows:
The electro-hydraulic preparation method of above-mentioned lithium ion battery composite guide, includes the following steps:
1) 2-6 parts of sodium carboxymethylcellulose is added in solvent and is uniformly mixed, 0.5-2 parts of 3- front three is then added
Base-silane borate is uniformly mixed, obtained solution A；
Sodium alginate that will be 3-9 parts, which is added in solvent, to be uniformly mixed, be then added 0.5-2 parts film forming agent and 1-5 parts
Conductive agent, after mixing obtained solution B；
2) solution A is uniformly mixed with solution B, it is electro-hydraulic that lithium ion battery composite guide is made.
Solution A is added in solution B in step 2) and is uniformly mixed.
The mass ratio of the solvent mixed respectively with sodium carboxymethylcellulose and sodium alginate in step 1) is 1:1.
It is uniformly mixed in step 1) and step 2) and refers to stirring 120min.It is equal that mixing in solvent is added in sodium carboxymethylcellulose
After even, 30min is stood.
Solution A is uniformly mixed with solution B in step 2) carries out in environment of the humidity less than 10%.
The technical solution of lithium ion battery is as follows:
A kind of lithium ion battery is made using such as above-mentioned lithium ion battery composite guide is electro-hydraulic.
The lithium ion battery is made as the method included the following steps: will be described in negative electrode active material, binder addition
During lithium ion battery composite guide is electro-hydraulic, uniformly mix.
The binder be compound binding agent, the compound binding agent by mass ratio be 2:3 sodium carboxymethylcellulose and
Sodium alginate composition.
By negative electrode active material, binder be added the lithium ion battery composite guide it is electro-hydraulic in after use high speed dispersion agent
Disperse 120min, the strainer filtering then through 160 mesh is up to negative electrode slurry.Obtained negative electrode slurry is coated and dried obtained cathode
Piece.Lithium ion battery is made using above-mentioned negative electrode tab and positive plate, diaphragm, electrolyte.
The positive plate is using LiFePO4 as positive electrode.In the electrolyte, electrolyte LiPF6Concentration be 1mol/
L, solvent EC, DEC, PC are with the mixed solvent that volume ratio is that 1:1:1 is mixed to get.The diaphragm is 2400 film of Celgard
Lithium ion battery of the invention is added to 3- trimethyl-silane borate with combined conductive agent, due to 3- trimethyl-
Silane borate can dissolve lithium fluoride, reduce the generation of mineral products, moreover it is possible to reduce cell interface impedance, while 3- trimethyl-
Silane borate can promote to form more organic principles and less inorganic constituents in SEI film again, not only contribute to fill
The conduction of lithium ion during discharge cycles is also beneficial to reduce the impedance of lithium ion battery, and then ensure that excellent circulation
Stability, while can be very good to inhibit Fe again2+It is dissolved into electrolyte to improve the quality of SEI, and then can be improved lithium
The high temperature cyclic performance of ion battery.The present invention by addition 3- trimethyl-silane borate, can to negative electrode material surface into
Row is modified, and is improved the structural stability of SEI under the high temperature conditions, while modified from negative electrode material surface, can fundamentally be mentioned
High negative electrode material thermal structure stability, and can reduce the expansion rate of negative electrode tab.
Further, conductive agent uses amination graphene or aminated carbon nano tube, the amino group on conductive agent surface
With the compatibility with higher of surface group in electrolyte, therefore the compatibility of material and electrolyte can be improved.
Further, sodium carboxymethylcellulose has the characteristics that swelling ratio is low in compound binding agent, and sodium alginate has electricity
The characteristics of chemical stabilization, the two can play synergistic effect, improve the cycle performance of its material.
Detailed description of the invention
Fig. 1 is the charge and discharge cycles curve of lithium ion battery obtained in 1-3 of the embodiment of the present invention and comparative example.
Specific embodiment
In order to be easier to understand the technical problems, technical solutions and beneficial effects solved by the present invention, below with reference to tool
The present invention is described in detail for body embodiment.
Embodiment 1
The lithium ion of the present embodiment is grouped as with combined conductive agent by the group of following weight: the 3- trimethyl-silane of 1.0g
Borate, the film forming agent of 1.0g, the conductive agent of 3.0g, 9g compound binding agent；Wherein, film forming agent is perfluorinated sulfonic acid lithium, conductive
Agent is amination graphene, and compound binding agent is mixed with the sodium alginate of 5.0g by the sodium carboxymethylcellulose of 4.0g and formed.
The lithium ion of the present embodiment is grouped as with the electro-hydraulic group by following weight of composite guide: the 3- trimethyl-silane of 1.0g
Borate, the film forming agent of 1.0g, the conductive agent of 3.0g, the compound binding agent of 9g and 100g solvent；Wherein, film forming agent is perfluor
Sulfonic Lithium, conductive agent are amination graphene, and compound binding agent is by the sodium carboxymethylcellulose of 4.0g and the sodium alginate of 5.0g
Mixing composition, solvent is N-Methyl pyrrolidone.
The electro-hydraulic preparation method of the lithium ion battery composite guide of the present embodiment, includes the following steps:
1) sodium carboxymethylcellulose of 4.0g is added in 50g solvent N-methyl pyrilidone, stirring 120min makes to mix
Uniformly, it is then allowed to stand 30min, then the 3- trimethyl-silane borate of 1.0g is added thereto, stirring 120min keeps mixing equal
It is even, obtained solution A；
The sodium alginate of 5.0g is added in 50g solvent N-methyl pyrilidone, stirring 120min makes to be uniformly mixed, then
The film forming agent perfluorinated sulfonic acid lithium of 1.0g and the conductive agent amination graphene of 3.0g are sequentially added, high-speed stirred 120min is made
Solution B；
2) in the environment that humidity is 3%, solution A is slowly added in solution B, stirring 120min makes to be uniformly mixed, and makes
It is electro-hydraulic to obtain lithium ion battery composite guide.
The lithium ion battery of the present embodiment using above-mentioned composite guide it is electro-hydraulic be made, preparation method include the following steps: by
93g artificial graphite, 3g hybrid adhesive be added to above-mentioned composite guide it is electro-hydraulic in, hybrid adhesive is by 1.2g sodium carboxymethylcellulose
It is mixed to get with 1.8g sodium alginate, 120min is then dispersed using high speed dispersion agent, the strainer filtering then through 160 mesh to obtain the final product
Negative electrode slurry is coated in negative current collector surface by negative electrode slurry, and it is anode with LiFePO4 that dry, negative electrode tab, which is made, in roll-in
Material prepares positive plate, in electrolyte, electrolyte LiPF6Concentration be 1mol/L, solvent EC, DEC, PC are 1 with volume ratio:
The mixed solvent that 1:1 is mixed to get, diaphragm are 2400 film of Celgard, use method in the prior art that capacity is made as 5Ah
Soft-package battery.
Embodiment 2
The lithium ion of the present embodiment is grouped as with combined conductive agent by the group of following weight: the 3- trimethyl-silane of 0.5g
Borate, the film forming agent of 0.5g, the conductive agent of 1.0g, 5g compound binding agent；Wherein, film forming agent NaBF4, conductive agent is ammonia
Base carbon nano tube, compound binding agent are mixed with the sodium alginate of 3.0g by the sodium carboxymethylcellulose of 2.0g and are formed.
The lithium ion of the present embodiment is grouped as with the electro-hydraulic group by following weight of composite guide: the 3- trimethyl-silane of 0.5g
Borate, the film forming agent of 0.5g, the conductive agent of 1.0g, the compound binding agent of 5g and 100g solvent；Wherein, film forming agent is
NaBF4, conductive agent is aminated carbon nano tube, and compound binding agent is by the sodium carboxymethylcellulose of 2.0g and the sodium alginate of 3.0g
Mixing composition, solvent are the mixed solvent that butyl acetate and ethylene glycol are mixed to get according to volume ratio 1:1.
The electro-hydraulic preparation method of the lithium ion battery composite guide of the present embodiment, includes the following steps:
1) sodium carboxymethylcellulose of 2.0g is added in 50g solvent, solvent is butyl acetate and ethylene glycol according to volume
Than the mixed solvent that 1:1 is mixed to get, stirring 120min makes to be uniformly mixed, and is then allowed to stand 30min, then is added 0.5g's thereto
3- trimethyl-silane borate, stirring 120min make to be uniformly mixed, obtained solution A；
The sodium alginate of 3.0g is added in 50g solvent, solvent is that butyl acetate is mixed with ethylene glycol according to volume ratio 1:1
Obtained mixed solvent, stirring 120min make to be uniformly mixed, and then sequentially add the film forming agent NaBF of 0.5g4With the conduction of 1.0g
Agent aminated carbon nano tube, high-speed stirred 120min, obtained solution B；
2) in the environment that humidity is 10%, solution A is slowly added in solution B, stirring 120min makes to be uniformly mixed, and makes
It is electro-hydraulic to obtain lithium ion battery composite guide.
The lithium ion battery of the present embodiment using above-mentioned composite guide it is electro-hydraulic be made, preparation method include the following steps: by
94g artificial graphite, 4g hybrid adhesive be added to above-mentioned composite guide it is electro-hydraulic in, hybrid adhesive is by 1.6g sodium carboxymethylcellulose
It is mixed to get with 2.4g sodium alginate, 120min is then dispersed using high speed dispersion agent, the strainer filtering then through 160 mesh to obtain the final product
Negative electrode slurry is coated in negative current collector surface by negative electrode slurry, and it is anode with LiFePO4 that dry, negative electrode tab, which is made, in roll-in
Material prepares positive plate, in electrolyte, electrolyte LiPF6Concentration be 1mol/L, solvent EC, DEC, PC are 1 with volume ratio:
The mixed solvent that 1:1 is mixed to get, diaphragm are 2400 film of Celgard, use method in the prior art that capacity is made as 5Ah
Soft-package battery.
Embodiment 3
The lithium ion of the present embodiment is grouped as with combined conductive agent by the group of following weight: the 3- trimethyl-silane of 2.0g
Borate, the film forming agent of 2.0g, the conductive agent of 5.0g, 15.0g compound binding agent；Wherein, film forming agent NaBF4, conductive agent
For amination graphene, compound binding agent is mixed with the sodium alginate of 9.0g by the sodium carboxymethylcellulose of 6.0g and is formed.
The lithium ion of the present embodiment is grouped as with the electro-hydraulic group by following weight of composite guide: the 3- trimethyl-silane of 2.0g
Borate, the film forming agent of 2.0g, the conductive agent of 5.0g, the compound binding agent of 15.0g and 100g solvent；Wherein, film forming agent is
NaBF4, conductive agent is amination graphene, and compound binding agent is mixed by the sodium carboxymethylcellulose of 6.0g and the sodium alginate of 9.0g
It is combined into, solvent is N-Methyl pyrrolidone.
The electro-hydraulic preparation method of the lithium ion battery composite guide of the present embodiment, includes the following steps:
1) sodium carboxymethylcellulose of 6.0g is added in 50g solvent, solvent is N-Methyl pyrrolidone, stirs 120min
Make to be uniformly mixed, be then allowed to stand 30min, then the 3- trimethyl-silane borate of 2.0g is added thereto, stirring 120min makes to mix
It closes uniformly, obtained solution A；
The sodium alginate of 9.0g is added in 50g solvent, solvent is N-Methyl pyrrolidone, and stirring 120min keeps mixing equal
It is even, then sequentially add the film forming agent NaBF of 2.0g4With the conductive agent amination graphene of 5.0g, high-speed stirred 120min, system
Obtain solution B；
2) in the environment that humidity is 1%, solution A is slowly added in solution B, stirring 120min makes to be uniformly mixed, and makes
It is electro-hydraulic to obtain lithium ion battery composite guide.
The lithium ion battery of the present embodiment using above-mentioned composite guide it is electro-hydraulic be made, preparation method include the following steps: by
93g artificial graphite, 3g hybrid adhesive be added to above-mentioned composite guide it is electro-hydraulic in, hybrid adhesive is by 1.2g sodium carboxymethylcellulose
It is mixed to get with 1.8g sodium alginate, 120min is then dispersed using high speed dispersion agent, the strainer filtering then through 160 mesh to obtain the final product
Negative electrode slurry is coated in negative current collector surface by negative electrode slurry, and it is anode with LiFePO4 that dry, negative electrode tab, which is made, in roll-in
Material prepares positive plate, in electrolyte, electrolyte LiPF6Concentration be 1mol/L, solvent EC, DEC, PC are 1 with volume ratio:
The mixed solvent that 1:1 is mixed to get, diaphragm are 2400 film of Celgard, use method in the prior art that capacity is made as 5Ah
Soft-package battery.
Embodiment 4
The lithium ion of the present embodiment is grouped as with combined conductive agent by the group of following weight: the 3- trimethyl-silane of 2.0g
Borate, the conductive agent of 3.0g, 10.0g compound binding agent；Wherein, conductive agent is amination graphene, compound binding agent by
The sodium carboxymethylcellulose of 5.0g mixes composition with the sodium alginate of 5.0g.
The lithium ion of the present embodiment is grouped as with the electro-hydraulic group by following weight of composite guide: the 3- trimethyl-silane of 2.0g
Borate, the conductive agent of 3.0g, the compound binding agent of 10.0g and 100g solvent；Wherein, conductive agent is amination graphene,
Compound binding agent is mixed with the sodium alginate of 5.0g by the sodium carboxymethylcellulose of 5.0g and is formed, and solvent is N- crassitude
Ketone.
The electro-hydraulic preparation method of the lithium ion battery composite guide of the present embodiment, includes the following steps:
1) sodium carboxymethylcellulose of 5.0g is added in 50g solvent, solvent is N-Methyl pyrrolidone, stirs 120min
Make to be uniformly mixed, be then allowed to stand 30min, then the 3- trimethyl-silane borate of 2.0g is added thereto, stirring 120min makes to mix
It closes uniformly, obtained solution A；
The sodium alginate of 5.0g is added in 50g solvent, solvent is N-Methyl pyrrolidone, and stirring 120min keeps mixing equal
It is even, the conductive agent amination graphene of 3.0g, high-speed stirred 120min, obtained solution B is then added；
2) in the environment that humidity is 1%, solution A is slowly added in solution B, stirring 120min makes to be uniformly mixed, and makes
It is electro-hydraulic to obtain lithium ion battery composite guide.
The lithium ion battery of the present embodiment using above-mentioned composite guide it is electro-hydraulic be made, preparation method include the following steps: by
92g artificial graphite, 3g hybrid adhesive be added to above-mentioned composite guide it is electro-hydraulic in, hybrid adhesive is by 1.2g sodium carboxymethylcellulose
It is mixed to get with 1.8g sodium alginate, 120min is then dispersed using high speed dispersion agent, the strainer filtering then through 160 mesh to obtain the final product
Negative electrode slurry is coated in negative current collector surface by negative electrode slurry, and it is anode with LiFePO4 that dry, negative electrode tab, which is made, in roll-in
Material prepares positive plate, in electrolyte, electrolyte LiPF6Concentration be 1mol/L, solvent EC, DEC, PC are 1 with volume ratio:
The mixed solvent that 1:1 is mixed to get, diaphragm are 2400 film of Celgard, use method in the prior art that capacity is made as 5Ah
Soft-package battery.
Embodiment 5
The lithium ion of the present embodiment is grouped as with combined conductive agent by the group of following weight: the 3- trimethyl-silane of 2.0g
The conductive agent of borate, 3.0g, conductive agent are amination graphene.
The lithium ion of the present embodiment is grouped as with the electro-hydraulic group by following weight of composite guide: the 3- trimethyl-silane of 2.0g
Borate, the conductive agent of 3.0g, the binder of 10.0g and 100g solvent；Wherein, conductive agent is conductive black, and binder is
Kynoar, solvent are N-Methyl pyrrolidone.
The electro-hydraulic preparation method of the lithium ion battery composite guide of the present embodiment, includes the following steps:
1) Kynoar of 5.0g is added in 50g solvent, solvent is N-Methyl pyrrolidone, and stirring 120min makes to mix
It closes uniformly, is then allowed to stand 30min, then the 3- trimethyl-silane borate of 2.0g is added thereto, stirring 120min keeps mixing equal
It is even, obtained solution A；
The Kynoar of 5.0g is added in 50g solvent, solvent is N-Methyl pyrrolidone, and stirring 120min makes to mix
Uniformly, the conductive agent conductive black of 3.0g, high-speed stirred 120min, obtained solution B is then added；
2) in the environment that humidity is 5%, solution A is slowly added in solution B, stirring 120min makes to be uniformly mixed, and makes
It is electro-hydraulic to obtain lithium ion battery composite guide.
The lithium ion battery of the present embodiment using above-mentioned composite guide it is electro-hydraulic be made, preparation method include the following steps: by
92g artificial graphite, 3g binder be added to above-mentioned composite guide it is electro-hydraulic in, binder is conductive black, then use high speed dispersion
Agent disperses 120min, and the strainer filtering then through 160 mesh is coated in negative pole currect collecting body surface up to negative electrode slurry, by negative electrode slurry
Negative electrode tab is made in face, dry, roll-in, prepares positive plate using LiFePO4 as positive electrode, in electrolyte, electrolyte LiPF6's
Concentration is 1mol/L, and solvent EC, DEC, PC are with the mixed solvent that volume ratio is that 1:1:1 is mixed to get, diaphragm Celgard
2400 films use method in the prior art that capacity is made as the soft-package battery of 5Ah.
Comparative example
Comparative example uses super carbon black conductive agent as conductive agent, by 93g artificial graphite, 2g sodium carboxymethylcellulose, 1g
SBR styrene butadiene rubbers (SBR) and 4g conductive agent are added in 100g N-Methyl pyrrolidone, then use high speed dispersion agent
Disperse 120min, 5Ah is made up to negative electrode slurry, according to method in the same manner as in Example 3 in the strainer filtering then through 160 mesh
Soft-package battery.
Test example
1) high temperature cyclic performance is tested
Lithium ion battery obtained in Example 1-3 and comparative example, at 55 DEG C, in the voltage range of 2.5-3.65V
It is interior, charge and discharge, the charge-discharge performance and cycle performance of test soft-package battery at high temperature, test are carried out with 1.0C/1.0C multiplying power
As a result as shown in table 1 and Fig. 1.
2) pole piece expansion rate is tested
The negative electrode tab of lithium ion battery obtained in embodiment 1-3 and comparative example is measured into its thickness using micrometer, is remembered
It is surveyed then after being prepared into lithium ion battery and being recycled 10 times according to the condition in step 1) with micrometer for original depth C1
It tries its negative electrode tab thickness and is denoted as C2, the expansion rate of pole piece is calculated by (C2-C1)/C1, the results are shown in Table 1.
1 embodiment 1-3 of table and the comparison of the chemical property of negative electrode tab and lithium ion battery in comparative example
As can be seen from Table 1, the soft-package battery high temperature cyclic performance that the present invention prepares is obviously due to comparative example, reason
It may be that under the high temperature conditions, 3- trimethyl-silane borate has high stability, and it is more organic to promote SEI to be formed
Ingredient improves the cycle performance of battery.In addition, under the high temperature conditions, compound binding agent has higher stability and smaller
Swelling ratio, reduce the expansion of pole piece, also further improve the cycle performance of battery.
Claims (6)
1. a kind of lithium ion battery combined conductive agent, which is characterized in that the component including following parts by weight: 0.5 ~ 2 part
3- trimethyl-silane borate, 1 ~ 5 part of conductive agent；
The lithium ion battery combined conductive agent further includes 5 ~ 15 parts of binder；The binder is compound binding agent, institute
Compound binding agent is stated to be made of the sodium carboxymethylcellulose and sodium alginate that mass ratio is 4-6:5-9；
The lithium ion battery combined conductive agent further includes 0.5-2 parts of film forming agent, the film forming agent be perfluorinated sulfonic acid lithium,
NaBF4One or both of；
The conductive agent is one or both of amination graphene, aminated carbon nano tube；
The lithium ion battery is negative electrode of lithium ion battery conductive agent with combined conductive agent.
2. a kind of lithium ion battery composite guide is electro-hydraulic, which is characterized in that the component including following parts by weight: 0.5 ~ 2 part
3- trimethyl-silane borate, 1 ~ 5 part of conductive agent, 5 ~ 15 parts of binder, 100 parts of solvents；
It further include 0.5-2 parts of film forming agent, the film forming agent is perfluorinated sulfonic acid lithium, NaBF4One or both of；
The binder be compound binding agent, the compound binding agent by mass ratio be 4-6:5-9 sodium carboxymethylcellulose and
Sodium alginate composition；
The conductive agent is one or both of amination graphene, aminated carbon nano tube；
The solvent is one or both of the mixture of butyl acetate and butyl glycol ether, N-Methyl pyrrolidone；
It is negative electrode of lithium ion battery conduction liquid that the lithium ion battery is electro-hydraulic with composite guide.
3. the electro-hydraulic preparation method of lithium ion battery composite guide as claimed in claim 2, which is characterized in that including walking as follows
It is rapid:
1) 2 ~ 6 parts of sodium carboxymethylcellulose is added in solvent and is uniformly mixed, 0.5-2 parts of 3- trimethyl-silicon is then added
Alkane borate is uniformly mixed, obtained solution A；
3-9 parts of sodium alginate is added in solvent and is uniformly mixed, 0.5-2 parts of film forming agent and 1-5 parts of conduction is then added
Agent, after mixing obtained solution B；
2) solution A is uniformly mixed with solution B, it is electro-hydraulic that lithium ion battery composite guide is made.
4. the electro-hydraulic preparation method of lithium ion battery composite guide according to claim 3, which is characterized in that in step 2
Solution A is uniformly mixed with solution B to be carried out in environment of the humidity less than 10%.
5. a kind of lithium ion battery, which is characterized in that use the electro-hydraulic system of lithium ion battery composite guide as claimed in claim 2
?.
6. lithium ion battery according to claim 5, which is characterized in that be made by the method included the following steps: will bear
During pole active material, the binder addition lithium ion battery composite guide are electro-hydraulic, uniformly mix.
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| CN107069039A (en) * | 2017-03-24 | 2017-08-18 | 江苏乐能电池股份有限公司 | Oiliness conduction liquid and preparation method thereof used in a kind of ferric phosphate lithium cell |
| CN108461753B (en) * | 2018-02-10 | 2020-05-05 | 中国科学院苏州纳米技术与纳米仿生研究所南昌研究院 | Carbon nanotube conductive agent slurry for lithium ion battery cathode material and preparation method thereof |
| CN108365223A (en) * | 2018-02-10 | 2018-08-03 | 中国科学院苏州纳米技术与纳米仿生研究所南昌研究院 | A kind of carbon nanotube conducting agent and preparation method thereof for anode material for lithium-ion batteries |
| CN111463409B (en) * | 2019-01-21 | 2023-05-02 | 贝特瑞新材料集团股份有限公司 | Silicon-based composite anode material, preparation method thereof and lithium ion battery comprising silicon-based composite anode material |
| CN111430686A (en) * | 2020-02-27 | 2020-07-17 | 蜂巢能源科技有限公司 | Negative electrode material, battery, and vehicle |
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| CN105355968A (en) * | 2015-11-24 | 2016-02-24 | 宁德新能源科技有限公司 | Electrolyte and lithium ion battery inducing same |
| CN105375066A (en) * | 2015-12-16 | 2016-03-02 | 东莞市杉杉电池材料有限公司 | Electrolyte suitable for silicon-carbon negative electrode lithium ion battery and silicon-carbon negative electrode lithium ion battery |
| CN105591105A (en) * | 2016-03-16 | 2016-05-18 | 江苏乐能电池股份有限公司 | Preparation method for coating surfaces of electrodes with solid electrolyte complex liquid |
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| CN105355968A (en) * | 2015-11-24 | 2016-02-24 | 宁德新能源科技有限公司 | Electrolyte and lithium ion battery inducing same |
| CN105375066A (en) * | 2015-12-16 | 2016-03-02 | 东莞市杉杉电池材料有限公司 | Electrolyte suitable for silicon-carbon negative electrode lithium ion battery and silicon-carbon negative electrode lithium ion battery |
| CN105591105A (en) * | 2016-03-16 | 2016-05-18 | 江苏乐能电池股份有限公司 | Preparation method for coating surfaces of electrodes with solid electrolyte complex liquid |
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