CN109560254A - A kind of lithium battery electrode plate and preparation method thereof - Google Patents
A kind of lithium battery electrode plate and preparation method thereof Download PDFInfo
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- CN109560254A CN109560254A CN201811384770.5A CN201811384770A CN109560254A CN 109560254 A CN109560254 A CN 109560254A CN 201811384770 A CN201811384770 A CN 201811384770A CN 109560254 A CN109560254 A CN 109560254A
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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
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/364—Composites as mixtures
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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
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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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
A kind of lithium battery electrode plate and preparation method thereof, active material, conductive agent, binder, chelating agent are dispersed in proportion in a solvent, to be prepared into cell size, and slurry is coated on collector, and thermally treated and roller process obtains pole piece；Since a small amount of chelating agent being added in pulping process, chelating agent in slurry has carboxyl, the functional groups such as amino, interaction can be generated with the carboxyl or hydroxy functional group of binder and active material surface, chelating agent can also have stronger complexing with foil metal surface (residual metal ions) simultaneously, play the role of adhesive, therefore, the cohesive force between electrode slurry and collector foil can be greatly improved while reducing the dosage of pole piece high polymer binder, to promote the energy density of battery while promoting the cycle life and high rate performance of battery.
Description
Technical field
The invention belongs to field of batteries, and in particular to a kind of lithium battery electrode plate and preparation method thereof.
Background technique
Lithium ion battery due to having many advantages, such as clean and environmental protection, energy density height, discharging voltage balance, good cycle,
Have become the main energy sources of communication electronic product.In recent years, the new energy that lithium ion battery is considered most promising is dynamic
One of power form, the scientist of various countries are constantly dedicated to the more practical and effective lithium ion battery of developmental research.People are to big
Capacity, the demand of high-power battery are more more and more urgent, and the requirement especially to automobile power battery is higher and higher, and to meet
Automobile-used requirement, circulation, multiplying power, the security performance of battery are all particularly important.
Patent CN101174685A and patent CN104518200B discloses a kind of one layer 5-10 μm of coating on a current collector
Conducting resinl, the pole piece coating method being then again coated on positive/negative material on conductive adhesive layer.This method can be certain
Reduce pole piece internal resistance in degree, improve cycle performance, improve battery high rate performance, but is coated with one layer 5-10 μm on a current collector
Conductive adhesive layer can reduce the energy density of battery.
Summary of the invention
Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a kind of lithium battery electrode plate and its preparations
Method, is added a small amount of chelating agent in pulping process, and this method can mention significantly while reducing the dosage of pole piece binder
Cohesive force between high electrode slurry and collector foil, to be mentioned while promoting the cycle life and high rate performance of battery
Rise the energy density of battery.
To achieve the above object, the present invention is to be achieved through the following technical solutions:
A kind of preparation method of lithium battery electrode plate, lithium battery electrode plate include positive plate of lithium battery and cathode of lithium battery
Piece；
By mass percentage, by positive electrode active materials 80%~99%, conductive agent 0.5%~9%, binder
0.499%~9% and the chelating agent 0.001%~2% containing carboxyl and amino, dispersion in a solvent, is prepared into positive electricity
Positive battery slurry is coated on plus plate current-collecting body by pond slurry, and thermally treated and roller process obtains positive plate of lithium battery；
By mass percentage, by negative electrode active material 80%~99%, conductive agent 0.5%~9%, binder
0.499%~9% and chelating agent 0.001%~2%, dispersion in a solvent, is prepared into negative battery slurry, by negative battery
Slurry is coated on negative current collector, and thermally treated and roller process obtains lithium battery cathode plate.
A further improvement of the present invention lies in that the positive electrode active materials are LiFePO4, cobalt acid lithium, LiMn2O4, nickel cobalt
One or more of LiMn2O4, nickel cobalt lithium aluminate, nickel ion doped, lithium-rich anode material；The negative electrode active material be graphite,
The one or more of hard carbon, silica-base material；The chelating agent containing carboxyl and amino be citric acid, sodium citrate, tartaric acid,
Sodium tartrate, gluconic acid, sodium gluconate, ethylenediamine tetra-acetic acid, sodium ethylene diamine tetracetate, aminotriacetic acid, three second of amino
Sour sodium, diethylene-triamine pentaacetic acid, diethylenetriaminepentaacetic acid sodium, hydroxyethylethylene diamine tri-acetic acid, hydroxyethyl ethylenediamine
Triacetic acid sodium, bicine N-, aminotrimethylenephosphonic acid, ethylene diamine tetra methylene phosphonic acid, 1-hydroxy ethylidene-1,1-diphosphonic acid, divinyl
Five methylenephosphonic acid of triamine, 1,2- dimethyl -3- hydroxyl -4- pyridone, hydrolysis of polymaleic anhydride, fumaric acid (fumaric acid) -
One or more of propene sulfonic acid copolymer.
A further improvement of the present invention lies in that the solid content of the positive battery slurry is 30%~80%.
A further improvement of the present invention lies in that the plus plate current-collecting body is aluminium foil.
A further improvement of the present invention lies in that the negative battery slurry solid content is 30%~60%；The anode collection
Fluid is utter misery aluminium foil.
A further improvement of the present invention lies in that the negative current collector is copper foil.
A further improvement of the present invention lies in that the conductive agent is conductive carbon black, electrically conductive graphite, acetylene black, Ketjen black, gas
One or more of phase grown carbon fiber, carbon nanotube, graphene, carbon fiber, conducting polymer；Negative current collector is utter misery
Copper foil.
A further improvement of the present invention lies in that the binder is polyvinylidene fluoride, polyvinyl alcohol, polyacrylic acid, gathers
One or more of tetrafluoroethene, sodium alginate, sodium carboxymethylcellulose, butadiene-styrene rubber.
A further improvement of the present invention lies in that the solvent be water, ethyl alcohol, acetone, isopropanol, N-Methyl pyrrolidone,
One or more of dimethylformamide, diethylformamide, dimethyl sulfoxide, tetrahydrofuran；The coating method is crowded
Pressure type coating, transfer type coating or spraying.
A kind of lithium battery electrode plate prepared according to above-mentioned method.
Compared with prior art, the present invention has the following beneficial effects: a small amount of chelating agent is added in pulping process, slurry
Chelating agent small molecule in material has the functional groups such as carboxyl, amino, can with the carboxyl of binder and surface of active material or
The functional groups such as hydroxyl generate interaction, while chelating agent can also have with foil metal surface (residual metal ions) it is stronger
Complexing plays the role of adhesive, therefore, can mention significantly while reducing the dosage of pole piece high polymer binder
Cohesive force between high electrode slurry and collector foil, to be mentioned while promoting the cycle life and high rate performance of battery
Rise the energy density of battery.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
The method of detection battery slurry dispersion stabilization of the present invention are as follows: by active material, conductive agent, bonding
In the solvent that agent, chelating agent are dispersed in proportion, it is prepared into cell size, cell size is coated on the collector of pole, through heat
Processing and roller process obtain pole piece；
The electrode slice includes positive plate of lithium battery and lithium battery cathode plate；
The positive electrode active materials are LiFePO4, cobalt acid lithium, LiMn2O4, nickle cobalt lithium manganate, nickel cobalt lithium aluminate, nickel mangaic acid
One or more of lithium, lithium-rich anode material；The negative electrode active material is one kind or several of graphite, hard carbon, silica-base material
Kind.
The chelating agent is citric acid (CA) and its sodium salt, tartaric acid (TA) and its sodium salt, gluconic acid (GA) and its sodium
Salt, ethylenediamine tetra-acetic acid (EDTA) and its sodium salt, aminotriacetic acid (NTA) and its sodium salt, diethylene-triamine pentaacetic acid and its
Sodium salt, hydroxyethylethylene diamine tri-acetic acid (HEDTA) and its sodium salt, bicine N- (DEG), aminotrimethylenephosphonic acid
(ATMP), ethylene diamine tetra methylene phosphonic acid (EDTMP), 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP), diethylene triamine pentamethylene phosphonic
(DTPMP), 1,2- dimethyl -3- hydroxyl -4- pyridone (DHPO), hydrolysis of polymaleic anhydride, fumaric acid (fumaric acid) -
One or more of propene sulfonic acid copolymer.
When preparing positive plate of lithium battery, by mass percentage, positive electrode active materials 80%~99%, conductive agent 0.5%
~9%, binder 0.499%~9%, chelating agent 0.001%~2%；And the solid content of anode sizing agent is 30%~80%；Institute
Stating plus plate current-collecting body is aluminium foil or utter misery aluminium foil.
When preparing lithium battery cathode plate, by mass percentage, negative electrode active material 80%~99%, conductive agent 0.5%
~9%, binder 0.499%~9%, chelating agent 0.001%~2%；And negative electrode slurry solid content is 30%~60%；It is described
Negative current collector is copper foil or utter misery copper foil.
The conductive agent be conductive carbon black, electrically conductive graphite, acetylene black, Ketjen black, gas-phase growth of carbon fibre, carbon nanotube,
One or more of graphene, carbon fiber, conducting polymer；
The binder is polyvinylidene fluoride (PVDF), polyvinyl alcohol (PVA), polyacrylic acid (PAA), polytetrafluoroethylene (PTFE)
(PTFE), one or more of sodium alginate (NaAlg), sodium carboxymethylcellulose (CMC), butadiene-styrene rubber (SBR).
The solvent be water, ethyl alcohol, acetone, isopropanol, N-Methyl pyrrolidone (NMP), dimethylformamide (DMF),
One or more of diethylformamide (DEF), dimethyl sulfoxide (BMSO), tetrahydrofuran (THF).
The coating method is squash type coating, transfer type coating or spraying.
Specific embodiment is as follows:
Comparative example 1
Positive slurrying: nickel-cobalt lithium manganate cathode material 96%, carbon nanotube conducting agent is carried out according to following mass ratio
0.5%, SP conductive agent 1.5%, PVDF binder 2.0%；By double planetary mixer, solid content is prepared by solvent of NMP
68% anode sizing agent.Slurry is applied on aluminium foil by the way of squash type coating, thermally treated and roller process obtains
Required positive plate.
Comparative example 2
Cathode slurrying is carried out according to following mass percent: by graphite cathode material 95.8%, conductive carbon black SP conductive agent
1%, CMC binder 1.4%, SBR binder 1.8%；By double planetary mixer, takes water as a solvent and be prepared into solid content 46%
Negative electrode slurry.Slurry is applied on copper foil by the way of squash type coating, needed for thermally treated and roller process obtains
Negative electrode tab.
Embodiment 1
Carry out positive slurrying according to following mass percent: by nickel-cobalt lithium manganate cathode material 96.5%, carbon nanotube is led
Electric agent 0.5%, conductive carbon black SP conductive agent 1.5%, PVDF binder 1%, DHPO chelating agent 0.5%；It is stirred by double-planet
Machine is prepared into the anode sizing agent of solid content 68% using NMP as solvent.Slurry is applied to aluminium foil by the way of squash type coating
On, thermally treated and roller process obtains required positive plate.
Embodiment 2
Cathode slurrying is carried out according to following mass percent: by graphite cathode material 96%, conductive carbon black SP conductive agent
1%, CMC binder 1.2%, SBR binder 1.6%, EDTA chelating agent 0.2%；By double planetary mixer, take water as a solvent
It is prepared into the negative electrode slurry of solid content 46%.Slurry is applied on copper foil by the way of squash type coating, it is thermally treated and
Roller process obtains required negative electrode tab.
Embodiment 3
Positive slurrying is carried out according to following mass percent: by lithium iron phosphate positive material 80%, carbon nanotube conducting agent
9%, PVDF binder 9%, lemon acid sequestering agent 2%；By double planetary mixer, solid content is prepared by solvent of NMP
30% anode sizing agent.Slurry is applied on aluminium foil by the way of squash type coating, thermally treated and roller process obtains
Required positive plate.
Embodiment 4
Cathode slurrying is carried out according to following mass percent: by hard carbon cathode material 80%, conductive carbon black SP conductive agent
9%, SBR binder 9%, sodium citrate chelating agent 2%；By double planetary mixer, takes water as a solvent and be prepared into solid content
30% negative electrode slurry.Slurry is applied on copper foil by the way of squash type coating, thermally treated and roller process obtains
Required negative electrode tab.
Embodiment 5
Positive slurrying is carried out according to following mass percent: by lithium iron phosphate positive material 99%, carbon nanotube conducting agent
0.5%, PVDF binder 0.499%, winestone acid sequestering agent 0.001%；By double planetary mixer, prepared by solvent of ethyl alcohol
At the anode sizing agent of solid content 80%.Slurry is applied on utter misery aluminium foil by the way of squash type coating, it is thermally treated and
Roller process obtains required positive plate.
Embodiment 6
Cathode slurrying is carried out according to following mass percent: by hard carbon cathode material 99%, electrically conductive graphite conductive agent
0.5%, CMC binder 0.499%, sodium tartrate chelating agent 0.001%；By double planetary mixer, using acetone as solvent system
The standby negative electrode slurry at solid content 60%.Slurry is applied on utter misery copper foil by the way of squash type coating, it is thermally treated
Required negative electrode tab is obtained with roller process.
Embodiment 7
Positive slurrying is carried out according to following mass percent: by lithium cobaltate cathode material 83%, acetylene black conductor 5%,
Conductive carbon black SP conductive agent 2.5%, PVDF binder 8%, gluconic acid chelating agent 1.5%；By double planetary mixer, with different
Propyl alcohol is the anode sizing agent that solvent is prepared into solid content 40%.Slurry is applied on aluminium foil by the way of squash type coating,
Thermally treated and roller process obtains required positive plate.
Embodiment 8
Cathode slurrying is carried out according to following mass percent: by silicon based anode material 83%, Ketjen black conductive agent 7.5%,
CMC binder 3%, SBR binder 5%, sodium gluconate chelating agent 1.5%；By double planetary mixer, with N- methylpyrrole
Alkanone is the negative electrode slurry that solvent is prepared into solid content 40%.Slurry is applied on copper foil by the way of squash type coating,
Thermally treated and roller process obtains required negative electrode tab.
Embodiment 9
Positive slurrying is carried out according to following mass percent: by lithium cobaltate cathode material 86%, carbon nanotube conducting agent
3%, conductive carbon black SP conductive agent 3%, PVDF binder 7%, disodium ethylene diamine tetraacetate chelating agent 1%；It is stirred by double-planet
Machine is mixed, the anode sizing agent of solid content 50% is prepared into using dimethylformamide as solvent.It will slurry by the way of squash type coating
Material is applied on utter misery aluminium foil, and thermally treated and roller process obtains required positive plate.
Embodiment 10
Carry out cathode slurrying according to following mass percent: by silicon based anode material 86%, gas-phase growth of carbon fibre is conductive
Agent 6%, CMC binder 5%, SBR binder 2%, aminotriacetic acid chelating agent 1%；By double planetary mixer, with dimethyl
Sulfoxide is the negative electrode slurry that solvent is prepared into solid content 50%.Slurry is applied to utter misery copper foil by the way of squash type coating
On, thermally treated and roller process obtains required negative electrode tab.
Embodiment 11
Positive slurrying: manganate cathode material for lithium 90%, graphene conductive agent 2%, SP is carried out according to following mass percent
Conductive agent 1.5%, PVDF binder 6%, aminotriacetic acid sodium chelating agent 0.5%；By double planetary mixer, with tetrahydrofuran
The anode sizing agent of solid content 60% is prepared into for solvent.Slurry is applied on aluminium foil by the way of squash type coating, through heat
Processing and roller process obtain required positive plate.
Embodiment 12
Cathode slurrying is carried out according to following mass percent: by graphite cathode material 90%, electric conduction of carbon fiber agent 3%, CMC
Binder 3.5%, SBR binder 3%, diethylene-triamine pentaacetic acid chelating agent 0.5%；By double planetary mixer, with two
Ethyl-formamide is the negative electrode slurry that solvent is prepared into solid content 60%.Slurry is applied to copper by the way of squash type coating
On foil, thermally treated and roller process obtains required negative electrode tab.
Embodiment 13
Positive slurrying is carried out according to following mass percent: by manganate cathode material for lithium 93%, conducting polymer conductive agent
0.8%, SP conductive agent 1%, PVDF binder 5%, diethylenetriaminepentaacetic acid sodium chelating agent 0.2%；It is stirred by double-planet
Machine is mixed, the anode sizing agent of solid content 70% is prepared into using NMP as solvent.Slurry is applied to by the way of squash type coating
On charcoal aluminium foil, thermally treated and roller process obtains required positive plate.
Embodiment 14
Cathode slurrying is carried out according to following mass percent: by graphite cathode material 93%, acetylene black conductor 4%, CMC
Binder 1.2%, SBR binder 1.6%, hydroxyethylethylene diamine tri-acetic acid chelating agent 0.2%；By double planetary mixer, with
Water is the negative electrode slurry that solvent is prepared into solid content 46%.Slurry is applied to utter misery copper foil by the way of squash type coating
On, thermally treated and roller process obtains required negative electrode tab.
Embodiment 15
Positive slurrying is carried out according to following mass percent: by nickel-cobalt lithium manganate cathode material 96%, electric conduction of carbon fiber agent
0.5%, SP conductive agent 1%, PVDF binder 2%, hydroxyethyl ethylenediamine triacetate chelating agent 0.5%；It is stirred by double-planet
Machine is mixed, the anode sizing agent of solid content 68% is prepared into using NMP as solvent.Slurry is applied to aluminium by the way of squash type coating
On foil, thermally treated and roller process obtains required positive plate.
Embodiment 16
Cathode slurrying is carried out according to following mass percent: by silicon based anode material 96%, conducting polymer conductive agent
1%, CMC binder 1.2%, SBR binder 1.6%, bicine N- chelating agent 0.2%；By double planetary mixer,
Take water as a solvent the negative electrode slurry for being prepared into solid content 46%.Slurry is applied on copper foil by the way of squash type coating,
Thermally treated and roller process obtains required negative electrode tab.
Embodiment 17
Positive slurrying is carried out according to following mass percent: by nickel-cobalt lithium manganate cathode material 95%, carbon nanotube conducting
Agent 0.5%, SP conductive agent 1.5%, PVDF binder 2.5%, aminotrimethylenephosphonic acid chelating agent 0.5%；It is stirred by double-planet
Machine is mixed, the anode sizing agent of solid content 65% is prepared into using NMP as solvent.Slurry is applied to by the way of squash type coating
On charcoal aluminium foil, thermally treated and roller process obtains required positive plate.
Embodiment 18
Cathode slurrying is carried out according to following mass percent: by silicon based anode material 95%, graphene conductive agent 1%, CMC
Binder 1.2%, SBR binder 2.6%, ethylene diamine tetra methylene phosphonic acid chelating agent 0.2%；By double planetary mixer, with water
The negative electrode slurry of solid content 49% is prepared into for solvent.Slurry is applied on utter misery copper foil by the way of squash type coating,
Thermally treated and roller process obtains required negative electrode tab.
Embodiment 19
Positive slurrying is carried out according to following mass percent: by lithium-rich anode material 94%, Ketjen black conductive agent 2%, SP
Conductive agent 1.5%, PVDF binder 2%, 1-hydroxy ethylidene-1,1-diphosphonic acid chelating agent 0.5%；By double planetary mixer, it is with NMP
Solvent is prepared into the anode sizing agent of solid content 69%.Slurry is applied on aluminium foil by the way of squash type coating, at heat
Reason and roller process obtain required positive plate.
Embodiment 20
Cathode slurrying is carried out according to following mass percent: by hard carbon cathode material 94%, carbon nanotube conducting agent 3%,
CMC binder 1.2%, SBR binder 1.6%, diethylene triamine pentamethylene phosphonic chelating agent 0.2%；It is stirred by double-planet
Machine takes water as a solvent the negative electrode slurry for being prepared into solid content 48%.Slurry is applied to copper foil by the way of squash type coating
On, thermally treated and roller process obtains required negative electrode tab.
Embodiment 21
Positive slurrying is carried out according to following mass percent: by nickel cobalt lithium aluminate cathode material 92%, carbon nanotube conducting
Agent 3.5%, SP conductive agent 1.5%, PVDF binder 2%, hydrolysis of polymaleic anhydride chelating agent 1%；By double planetary mixer,
The anode sizing agent of solid content 66% is prepared into using NMP as solvent.Slurry is applied to utter misery aluminium by the way of squash type coating
On foil, thermally treated and roller process obtains required positive plate.
Embodiment 22
Cathode slurrying is carried out according to following mass percent: by hard carbon cathode material 92%, SP conductive agent 5%, CMC bonding
Agent 1.2%, SBR binder 1.6%, fumaric acid (fumaric acid)-propene sulfonic acid copolymer chelating agent 0.2%；Pass through duplicate rows
Star blender takes water as a solvent the negative electrode slurry for being prepared into solid content 45%.Slurry is coated with by the way of squash type coating
Onto utter misery copper foil, thermally treated and roller process obtains required negative electrode tab.
Embodiment 23
Cathode slurrying is carried out according to following mass percent: by graphite cathode material 92%, SP conductive agent 5%, polyethylene
Alcohol binder 1.2%, polyacrylic acid binder 1.6%, hydrolysis of polymaleic anhydride chelating agent 0.1%, lemon acid sequestering agent
0.1%；By double planetary mixer, the negative electrode slurry for being prepared into solid content 45% is taken water as a solvent.Using transfer type coating
Slurry is applied on copper foil by mode, and thermally treated and roller process obtains required negative electrode tab.
Embodiment 24
Positive slurrying is carried out according to following mass percent: by nickel lithium manganate cathode material 94%, Ketjen black conductive agent
2%, SP conductive agent 1.5%, polytetrafluoroethylene (PTFE) binder 1%, sodium alginate binder 1%, aminotrimethylenephosphonic acid chelating agent
0.2%, ethylene diamine tetra methylene phosphonic acid chelating agent 0.3%；By double planetary mixer, solid content is prepared by solvent of NMP
69% anode sizing agent.Slurry is applied on aluminium foil by the way of spraying, thermally treated and roller process obtain needed for just
Pole piece.
Table 1 is comparative example 1-2 and active material percentage, resistivity and the peel strength value of embodiment 1-2 gained pole piece.
The resistivity and peel strength of pole piece obtained by 1 comparative example 1-2 of table and embodiment 1-2
It can be seen from the data in Table 1 that the resistivity for the pole piece that embodiment 1 and embodiment 2 obtain is respectively compared with 1 He of comparative example
Comparative example 2 is substantially reduced, and peel strength is obviously improved compared with comparative example 1-2 respectively, shows to be added in pulping process a small amount of
Chelating agent can be substantially reduced pole piece resistivity, improve pole piece peel strength, after assembled battery, facilitate promoted battery
Cycle life and high rate performance.From the point of view of active material percentage, the active material percentage in embodiment 1-2 is relatively high, pole
The capacity of piece is higher, after assembled battery, facilitates the promotion of battery energy density.This shows that a small amount of chela is added in pulping process
Mixture can greatly improve between electrode slurry and collector foil while reducing the dosage of pole piece high polymer binder
Cohesive force, to promote the energy density of battery while promoting the cycle life and high rate performance of battery.
Claims (10)
1. a kind of preparation method of lithium battery electrode plate, it is characterised in that: lithium battery electrode plate includes positive plate of lithium battery and lithium
Battery cathode sheet；
By mass percentage, by positive electrode active materials 80%~99%, conductive agent 0.5%~9%, binder 0.499%~
9% and the chelating agent 0.001%~2% containing carboxyl and amino, dispersion in a solvent, is prepared into positive battery slurry, will
Positive battery slurry is coated on plus plate current-collecting body, and thermally treated and roller process obtains positive plate of lithium battery；
By mass percentage, by negative electrode active material 80%~99%, conductive agent 0.5%~9%, binder 0.499%~
9% and chelating agent 0.001%~2%, dispersion in a solvent, is prepared into negative battery slurry, negative battery slurry is coated
In on negative current collector, thermally treated and roller process obtains lithium battery cathode plate.
2. a kind of preparation method of lithium battery electrode plate according to claim 1, it is characterised in that: the positive-active material
Expect for one in LiFePO4, cobalt acid lithium, LiMn2O4, nickle cobalt lithium manganate, nickel cobalt lithium aluminate, nickel ion doped, lithium-rich anode material
Kind is several；The negative electrode active material is the one or more of graphite, hard carbon, silica-base material；It is described to contain carboxyl and amino
Chelating agent be citric acid, sodium citrate, tartaric acid, sodium tartrate, gluconic acid, sodium gluconate, ethylenediamine tetra-acetic acid, second
Sodium ethylene diamine tetracetate, aminotriacetic acid, aminotriacetic acid sodium, diethylene-triamine pentaacetic acid, diethylenetriaminepentaacetic acid sodium,
Hydroxyethylethylene diamine tri-acetic acid, hydroxyethyl ethylenediamine triacetate, bicine N-, aminotrimethylenephosphonic acid, ethylenediamine
Four methylenephosphonic acids, 1-hydroxy ethylidene-1,1-diphosphonic acid, diethylene triamine pentamethylene phosphonic, 1,2- dimethyl -3- hydroxyl -4- pyridone, water
Solve one or more of polymaleic anhydride, fumaric acid (fumaric acid)-propene sulfonic acid copolymer.
3. a kind of preparation method of lithium battery electrode plate according to claim 1, it is characterised in that: the positive battery slurry
The solid content of material is 30%~80%.
4. a kind of preparation method of lithium battery electrode plate according to claim 1, it is characterised in that: the plus plate current-collecting body
For aluminium foil.
5. a kind of preparation method of lithium battery electrode plate according to claim 4, it is characterised in that: the negative battery slurry
Expect that solid content is 30%~60%；The plus plate current-collecting body is utter misery aluminium foil.
6. a kind of preparation method of lithium battery electrode plate according to claim 1, it is characterised in that: the negative current collector
For copper foil.
7. a kind of preparation method of lithium battery electrode plate according to claim 6, it is characterised in that: the conductive agent is to lead
Electrical carbon is black, electrically conductive graphite, acetylene black, Ketjen black, gas-phase growth of carbon fibre, carbon nanotube, graphene, carbon fiber, conducting polymer
One or more of object；Negative current collector is utter misery copper foil.
8. a kind of preparation method of lithium battery electrode plate according to claim 1, it is characterised in that: the binder is poly-
Vinylidene fluoride, polyvinyl alcohol, polyacrylic acid, polytetrafluoroethylene (PTFE), sodium alginate, sodium carboxymethylcellulose, in butadiene-styrene rubber
It is one or more of.
9. a kind of preparation method of lithium battery electrode plate according to claim 1, it is characterised in that: the solvent be water,
Ethyl alcohol, acetone, isopropanol, N-Methyl pyrrolidone, dimethylformamide, diethylformamide, dimethyl sulfoxide, tetrahydrofuran
One or more of；The coating method is squash type coating, transfer type coating or spraying.
10. a kind of lithium battery electrode plate of method according to claim 11 preparation.
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