CN106159214A - Electrode slurry presoma, electrode slurry and preparation method thereof, electrode and lithium ion battery - Google Patents
Electrode slurry presoma, electrode slurry and preparation method thereof, electrode and lithium ion battery Download PDFInfo
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- CN106159214A CN106159214A CN201510146335.9A CN201510146335A CN106159214A CN 106159214 A CN106159214 A CN 106159214A CN 201510146335 A CN201510146335 A CN 201510146335A CN 106159214 A CN106159214 A CN 106159214A
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- electrode slurry
- electrode
- packaging bag
- weight
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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
- 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
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/0473—Filling tube-or pockets type electrodes; Applying active mass in cup-shaped terminals
- H01M4/0478—Filling tube-or pockets type electrodes; Applying active mass in cup-shaped terminals with dispersions, suspensions or pastes
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/0473—Filling tube-or pockets type electrodes; Applying active mass in cup-shaped terminals
- H01M4/048—Filling tube-or pockets type electrodes; Applying active mass in cup-shaped terminals with dry powder
-
- 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
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
-
- 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 present invention relates to field of batteries, specifically provide a kind of electrode slurry presoma, described electrode slurry presoma includes packaging bag film and is sealed in the electrode material in described packaging bag film, and described packaging bag film dissolves in organic solvent.The invention provides a kind of electrode slurry and preparation method thereof, the method includes: the polymeric material use organic solvent containing Kynoar is carried out dissolving and obtains solution by (1), described solution is carried out film forming and obtains packaging bag film；(2) electrode material is sealed with described packaging bag film, obtain electrode slurry presoma；(3) electrode slurry is obtained by described electrode slurry presoma addition organic solvent carries out dissolving.The invention provides a kind of electrode and lithium ion battery.The electrode slurry uniformity of the present invention is high, mechanical adhesion is good.
Description
Technical field
The present invention relates to a kind of electrode slurry presoma, a kind of electrode slurry and preparation method thereof, Yi Zhong electricity
Pole and a kind of lithium ion battery.
Background technology
The electrode slurry that component distribution is homogeneous, directly affects the combination property of lithium ion battery.Currently feed intake
Mode is mainly following two: A) preparation binder solution, add conductive agent mixing, add positive pole and live
Property material mixing pulping；B) binding agent mixes with conductive agent and positive active material, and mechanical agitation premixes,
Add solvent mixing pulping.
The current following several big shortcomings of feeding mode existence: 1. option A): slurry viscosity depends primarily on viscous
Knot agent, the slurry viscosity level entirety of program preparation is higher, relies on removing bubbles from slurry device, and during batch mixing
Between longer；2. option b): material mixing workshop dust pollution is serious, is unfavorable for that first-line staff is healthy, stirring
Equipment is easily lost, and energy consumption is high；3. two schemes, is and repeatedly feeds intake, and process is loaded down with trivial details, and error rate is high,
Moisture and impurity may be introduced during batch mixing；4. two schemes, for gel component, can only throw by hand
Material, is unfavorable for quickly producing；5. two schemes, recycling various types of materials packaging easily causes secondary pollution,
And increase cost.
Summary of the invention
It is an object of the invention to overcome the defect of prior art, it is provided that a kind of uniformity is more preferable, machinery is viscous
The electrode slurry that attached power is higher.
For realizing object defined above, first aspect, the invention provides a kind of electrode slurry presoma, described
Electrode slurry presoma includes packaging bag film and is sealed in the electrode material in described packaging bag film, described
Packaging bag film dissolves in organic solvent.
Second aspect, the invention provides a kind of electrode slurry, and this electrode slurry is by by of the present invention
Electrode slurry presoma dissolve obtain in organic solvent.
The third aspect, the invention provides the preparation method of a kind of electrode slurry, and the method includes:
(1) use organic solvent to carry out dissolving the polymeric material containing Kynoar and obtain solution,
Described solution is carried out film forming and obtains packaging bag film；
(2) electrode material is sealed with described packaging bag film, obtain electrode slurry presoma；
(3) electrode slurry is obtained by described electrode slurry presoma addition organic solvent carries out dissolving.
Fourth aspect, the invention provides a kind of electrode, and described electrode is by electrode slurry of the present invention
It is coated on electrode current collecting body, then carries out drying, roll-in, cut and obtain.
5th aspect, the invention provides a kind of lithium ion battery, and this lithium ion battery contains institute of the present invention
The electrode stated.
The electrode slurry uniformity of the present invention is high, mechanical adhesion is good.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Detailed description of the invention
As it was previously stated, the invention provides a kind of electrode slurry presoma, described electrode slurry presoma bag
Including packaging bag film and be sealed in the electrode material in described packaging bag film, described packaging bag film has dissolved in
Machine solvent.
In the present invention, described packaging bag film dissolve in organic solvent refer to packaging bag film can be by organic molten
Agent is dissolved.
In the present invention, described electrode slurry presoma refers to the compositions for preparing electrode slurry.
Electrode slurry presoma according to the present invention, optional wider range of the kind of described organic solvent,
Organic solvent commonly used in the art is used equally to the present invention, for the present invention, the most described organic molten
Agent is that N-Methyl pyrrolidone, main chain are less than the ketone of 6 carbon atoms, dimethyl sulfoxide, dimethyl
One or more in Methanamide, dimethyl acetylamide and oxolane, wherein, main chain is less than 6
The ketone of carbon atom for example, acetone etc..Use N-Methyl pyrrolidone in a particular embodiment of the present invention
Make exemplary illustration.
Electrode slurry presoma according to the present invention, the electrode material in the most described packaging bag film is powder
Shape or paste.
Electrode slurry presoma according to the present invention, the thickness of the most described packaging bag film is
0.05-0.5mm, more preferably 0.1-0.3mm.
Electrode slurry presoma according to the present invention, the material of described packaging bag film is wanted by the present invention without special
Asking, the conventional polymeric material that can make film is used equally to the present invention, for the present invention, and preferably institute
The material stating packaging bag film includes Kynoar (PVDF), with the weight of packaging bag film,
The content of described Kynoar is 40-100 weight %, preferably 60-90 weight %.
Electrode slurry presoma according to the present invention, wherein, the material of the most described packaging bag film also includes
Organic additive, the most described organic additive selected from Vingon (PVDC), polyvinyl alcohol (PVA),
Polyethylene Glycol, polyacrylate, polymethacrylates, polyurethane, Pioloform, polyvinyl acetal, polyethylene
One or more in base ether, Merlon and cellulose esters；With the weight of packaging bag film,
The content of described organic additive is 0-60 weight %, preferably 10-40 weight %.
Electrode slurry presoma according to the present invention, wherein, the material of the most described packaging bag film also includes
Inorganic additive, the most described inorganic additive contains the compound containing Group IIA element and/or containing IV A race
The compound of element, the most described inorganic additive be calcium carbonate, calcium sulfate, magnesium carbonate, magnesium sulfate,
One or more in calcium oxide, magnesium oxide, carbon fiber, white carbon black and white carbon；More preferably with packaging bag
The weight of film, the content of described inorganic additive is 1-10 weight %.
Electrode slurry presoma according to the present invention, wherein, the equal molecule of number of the most described Kynoar
Amount is 100000-2000000.
Electrode slurry presoma according to the present invention, wherein, the most described electrode material includes electrode activity
Material and binding agent.
Electrode slurry presoma according to the present invention, wherein, the most described electrode material includes electrode activity
Material, conductive agent and binding agent, described conductive agent is powder or range of viscosities is
10-100Pa*s (Brookfield R/S flow graph 10s-1Viscosity number) conductive agent serosity.
Electrode slurry presoma according to the present invention, wherein, electrode active material can be positive electrode active material
Matter can also be negative electrode active material, in a particular embodiment of the present invention, uses positive active material to make
For exemplary illustration.
Electrode slurry presoma according to the present invention, positive active material and negative electrode active material can be all
The conventional selection of this area, the present invention does not has specific requirement to its kind, such as when described electrode activity thing
When matter is positive active material, it can be in LiFePO4, cobalt acid lithium, LiMn2O4 and Li-Ni-Mn-Co-O
One or more.
Electrode slurry presoma according to the present invention, the consumption of electrode active material is wanted by the present invention without special
Ask, as long as ensureing that the electrode active material being sealed in packaging bag film disclosure satisfy that the consumption of electrode slurry is wanted
Ask, be not described here in detail.
Electrode slurry presoma according to the present invention, can be sealed in described as follows by electrode material
In packaging bag film: according to stoichiometric ratio, mass flowmenter is first used to control each dusty material flow, progressively
It is dosed in packaging bag film, is subsequently adding the conductive agent of fixed amount, finally use packaging bag film rope to tie up envelope
Mouthful, in actual application, every part of electrode material presoma is 10-50kg.
The invention provides a kind of electrode slurry, this electrode slurry is by by electrode slurry of the present invention
Presoma dissolves and obtains in organic solvent.
The invention provides the preparation method of a kind of electrode slurry, the method includes:
(1) use organic solvent to carry out dissolving the polymeric material containing Kynoar and obtain solution,
Described solution is carried out film forming and obtains packaging bag film；
(2) electrode material is sealed with described packaging bag film, obtain electrode slurry presoma；
(3) electrode slurry is obtained by described electrode slurry presoma addition organic solvent carries out dissolving.
According to the present invention, identical technical term does not carry out description is repeated several times, and quotes above.
According to the electrode slurry of the present invention, in the presence of being dissolved in conductive agent serosity described in preferred steps (3)
Carry out.
According to the electrode slurry of the present invention, the electrode slurry presoma of the present invention is used to carry out dissolving preparation electricity
Pole slurry, feed intake more handy and safe, and more accurate, it is to avoid wastage of material, and reduces material
Conveying cost, significantly reduces material mixing workshop dust pollution, beneficially personnel health；And particulate electrode slurry
Material precursor possesses slow releasing function, it is possible to obtain more homogeneous electrode slurries, and it also avoid moisture and
Being mixed into of impurity, electrode slurry viscosity is uprised by low simultaneously, and each component is easier to mixing；Thus the present invention
It is capable of the automatic charging of high viscosity component (Graphene serosity, CNT serosity).
Carry out according to the invention it is preferred to step (1) is evaporated organic solvent at 20 DEG C to (-40) DEG C
Described film forming.
According to the present invention, wherein, preferably film forming is carried out as follows: solution is spread in horizontal mold
In；At 20 DEG C to (-40) DEG C, evaporated under reduced pressure organic solvent.
According to the electrode slurry of the present invention, preferably the consumption of the polymeric material containing Kynoar is organic
2-10 weight % of solvent load.
According to the electrode slurry of the present invention, molten by described electrode slurry presoma addition organic solvent is carried out
Solution obtains electrode slurry and such as can will mix with organic solvent in electrode slurry presoma input mixing tank,
Stirring and evenly mixing pulping, through dispersion, sieves, obtains finished electrode slurry.
Condition according to dissolving in the present invention, step (1) includes: temperature is 20-45 DEG C.
According to the invention it is preferred to the condition dissolved in step (1) also includes: the time is 30-180min.
According to the invention it is preferred to the number-average molecular weight of described Kynoar is 100000-2000000.
According to the invention it is preferred to the weight of the polymeric material containing Kynoar, institute
The content stating Kynoar is 40-100 weight %, preferably 60-90 weight %.
According to the invention it is preferred to the described polymeric material containing Kynoar also includes organic additive,
Described organic additive be preferably selected from Vingon, polyvinyl alcohol, Polyethylene Glycol, polyacrylate,
Polymethacrylates, polyurethane, Pioloform, polyvinyl acetal, polyvingl ether, Merlon and cellulose
One or more in ester.
According to the invention it is preferred to the weight of the polymeric material containing Kynoar, institute
The content stating organic additive is 0-60 weight %, preferably 10-40 weight %.
According to the invention it is preferred to the described polymeric material containing Kynoar also includes inorganic additive,
Described inorganic additive contains the compound containing Group IIA element and/or the compound containing IV A race element, more
The most described inorganic additive be calcium carbonate, calcium sulfate, magnesium carbonate, magnesium sulfate, calcium oxide, magnesium oxide,
One or more in carbon fiber, white carbon black and white carbon.
According to the invention it is preferred to the weight of the polymeric material containing Kynoar, institute
The content stating inorganic additive is 1-10 weight %.
According to the invention it is preferred to described electrode material includes electrode active material and binding agent, more preferably institute
State electrode material include electrode active material, conductive agent and binding agent, the most described conductive agent be powder or
Range of viscosities is the conductive agent serosity of 10-100Pa*s.
According to the invention it is preferred to the thickness of described packaging bag film is 0.05-0.5mm, more preferably
0.1-0.3mm。
According to the present invention, the kind of described binding agent can be the conventional selection of this area, is preferably poly-inclined
One or more in difluoroethylene (PVDF), politef (PTFE) and pva powder.
According to the present invention, the consumption of described binding agent is preferably the 0.5-5 weight of electrode active material quality
%, preferably 0.5-3 weight %.
According to the present invention, the kind of described conductive agent can be the conventional selection of this area, such as, can be
Conductive carbon black, acetylene black, electrically conductive graphite, carbon fiber, carbon nanotube slurry and the one of Graphene serosity
Or it is multiple.
According to the invention it is preferred to 0.5-20 weight % that the consumption of conductive agent is electrode active material quality.
The invention is particularly suited to the mixing of the electrode slurry compositions that poor fluidity is difficult to mix.
As it was previously stated, the invention provides a kind of electrode, described electrode is by electrode slurry of the present invention
Or electrode slurry prepared by preparation method of the present invention is coated on electrode current collecting body, then dry
Dry, roll-in, cut and obtain.
As it was previously stated, the invention provides a kind of lithium ion battery, this lithium ion battery contains institute of the present invention
The electrode stated.
Below by specific embodiment, the present invention is described in detail, but the present invention is not limited to this.
Embodiment 1
Packaging bag film preparation technique: take 300mL beaker, 25 DEG C, add 190gNMP and 10g
HSV900,1000rpm stir 60min, and obtaining concentration is 5 weight %PVDF solution；Glass rod is scraped
It is applied to smooth glass pane surface；At-20 DEG C, use the dry solvent of dry air-blowing, obtain surface density about
0.015g/cm2Thin-film material (thickness is 0.1mm)；
Electrode slurry presoma preparation technology: after being simply mixed by various electrode powder materials, (proportioning is shown in Table
1) add in thin film, use double faced adhesive tape to seal.
Table 1
| LiFePO4 | Super_P | HSV900 | Packaging bag film PVDF |
| 100g | 5g | 3g | 1g |
Electrode slurry preparation technology is: 1. put in 400mL beaker by 135gNMP；2. by electrode slurry
Material precursor puts in beaker, and 500rpm stirs 30min；3. 1500rpm stirs 30min, and shutdown is scraped
Limit；4. 1500rpm stirs 90min, crosses 200 eye mesh screens and obtains finished electrode slurry.Wherein, batch mixing
Total time is 150min.
Coating tablet making technology: 1. taking finished electrode slurry, scraper for coating, base material is Al paper tinsel, one side sheet
Dressing density is 160g/m2；2. drying sheet parameter is 120 DEG C, 20min.
Use LiFePO4System, negative plate: Delanium, make bag-type battery.
Comparative example 1
Charging technology is: 1. put in 400mL beaker by 135gNMP；2. HSV900 is added,
1000rpm stirs 60min；3. Super_P, 1000rpm dispersed with stirring 20min is added；4. phosphorus is added
Acid ferrum lithium 100g, 1500rpm stir 30min, shut down scraping；5. 1500rpm stirs 90min, mistake
200 eye mesh screens obtain finished electrode slurry, and wherein material amount is shown in Table 2.(batch mixing total time is
200min)。
It is coated with film-making according to the method for embodiment 1.
Table 2
| LiFePO4 | Super_P | HSV900 | NMP |
| 100g | 5g | 4g | 135g |
Embodiment 2
Electrode slurry presoma composition is shown in Table 3:
Table 3
| Li-Ni-Mn-Co-O | CNT serosity | HSV900 | Packaging bag film PVDF |
| 100g | 20g | 0 | 1g |
In CNT serosity, CNT mass fraction is 5%.
Electrode slurry preparation technology is: 1. put in 400mL beaker by 41gNMP；2. by electrode slurry
Material precursor puts in beaker, and 500rpm stirs 30min；3. 1500rpm stirs 30min, and shutdown is scraped
Limit；4. 1500rpm stirs 90min, crosses 200 eye mesh screens and obtains finished electrode slurry.(batch mixing total time
For 150min).
It is coated with film-making according to the method for embodiment 1 and prepares battery.
Comparative example 2
Charging technology is: 1. put in 400mL beaker by 41gNMP；2. HSV900,1000rpm are added
Stirring 60min；3. CNT serosity, 1000rpm dispersed with stirring 20min are added；4. lithium-nickel-manganese-cobalt is added
Oxygen 100g, 1500rpm stir 30min, shut down scraping；5. 1500rpm stirs 90min, manual mistake
200 eye mesh screens obtain finished electrode slurry, and wherein material amount is shown in Table 4.(batch mixing total time is
200min)。
It is coated with film-making according to the method for embodiment 1.
Table 4
| Li-Ni-Mn-Co-O | CNT serosity | HSV900 | NMP |
| 100g | 20g | 1g | 41g |
In CNT serosity, CNT mass fraction is 5%.
Embodiment 3
According to the step of embodiment 1, two kinds of binder materials are used to prepare composite package bag film, remaining step
Rapid the most identical, wherein, composite package bag film preparation technique includes: takes 300mL beaker, 25 DEG C, adds
Enter 190gNMP Yu 9g HSV900 and 1g Polyethylene Glycol (number-average molecular weight about 420,000), 1000rpm
Stirring 60min, obtaining concentration is 5 weight % solution；Glass rod blade coating is to smooth glass pane surface；
At-20 DEG C, use the dry solvent of dry air-blowing, obtain surface density about 0.015g/cm2Thin-film material (thickness
For 0.1mm).
Embodiment 4
According to the step of embodiment 1, preparing packaging bag film according to following step, remaining step is the most identical,
Packaging bag film preparation technique: take 300mL beaker, 25 DEG C, add 190gNMP Yu 10g HSV900,
1000rpm stirs 60min, and obtaining concentration is 5 weight %PVDF solution；Glass rod blade coating is to smooth
Glass pane surface；At 120 DEG C, forced air drying 120min, remove solvent, obtain surface density about
0.015g/cm2Thin-film material (thickness is 0.1mm).
Embodiment 5
According to the step of embodiment 1, preparing packaging bag film according to following step, remaining step is the most identical:
25 DEG C, take 300mL beaker, add 120gNMP, 70g acetone, 10g HSV900,1000rpm
Stirring 60min, obtains 5 weight %PVDF solution；Weigh 1g MgCO3Powder, puts into above-mentioned solution
In, 1000rpm stirs 60min；Glass rod blade coating is to smooth glass pane surface, dehydrated alcohol eluting
Removing solvent, room temperature is dried, and obtains surface density about 0.01g/cm2Thin-film material (thickness is 0.1mm).
Embodiment 6
According to the step of embodiment 1, preparing packaging bag film according to following step, remaining step is the most identical:
25 DEG C, take 300mL beaker, add 120gNMP, 70g acetone, 10g HSV900,1000rpm
Stirring 60min, obtains 5 weight %PVDF solution；Weigh 1g MgO powder, put into above-mentioned solution
In, 1000rpm stirs 60min；Glass rod blade coating is to smooth glass pane surface, dehydrated alcohol eluting
Removing solvent, room temperature is dried, and obtains surface density about 0.01g/cm2Thin-film material (thickness is 0.1mm).
Embodiment 7
According to the step of embodiment 1, preparing packaging bag film according to following step, remaining step is the most identical:
25 DEG C, take 300mL beaker, add 120g NMP, 70g acetone, 10g HSV900,1000rpm
Stirring 60min, obtains 5%PVDF solution；Weigh 1g carbon fiber, put in above-mentioned solution, 1000rpm
Stirring 60min；Glass rod blade coating removes solvent, room to smooth glass pane surface, dehydrated alcohol eluting
Temperature is dried, and obtains surface density about 0.01g/cm2Thin-film material (thickness is 0.1mm).
Test case
According to sieving time and screen cloth residue, electrode slurry viscosity, pole piece state, pole piece resistance
Distribution, five test indexs of pole piece peel strength, it is judged that electrode slurry uniform component distribution
According to solute effect, it is judged that packaging bag film can twice dispersing in electrode slurry.
1. sieve the time and screen surface residue test
Recording electrode slurry sieves the time, and whether visual screen cloth (200 mesh) surface exists obvious granule.
Embodiment 1 test result is: sieve time 15min, without obvious residue and granule
Comparative example 1 test result is: sieve time 18min, without obvious residue and granule
As can be seen here, using the electrode slurry presoma of the present invention, packaging bag film can be fully dispersed in electricity
In the slurry of pole；In electrode slurry, secondary agglomeration grain diameter is less, illustrates that the distribution of each component is more uniform.
2. electrode slurry viscosity test
Use Brookfield R/S flow graph, CC25 rotor, the 10s of observation electrode slurry-1Viscosity.
Embodiment 1 test result is: 5800mPa*s
Comparative example 1 test result is: 6790mPa*s
Embodiment 2 test result is: 4850mPa*s
Comparative example 2 test result is: 4930mPa*s
3. pole piece state verification
Visually whether pole piece exists open defect (line/pore/salient point etc.).
Embodiment 1 test result is: no significant defect
Comparative example 1 test result is: 3, pore
Embodiment 2 test result is: no significant defect
Comparative example 2 test result is: no significant defect
4. pole piece resistance test
Use RTS-8 tetra-probe instrument, detection pole piece resistivity and distribution.
Embodiment 1 test result is: 18 Ω * cm, unevenness 12%
Comparative example 1 test result is: 20 Ω * cm, unevenness 18%
Embodiment 2 test result is: 23 Ω * cm, unevenness 6.5%
Comparative example 2 test result is: 23 Ω * cm, unevenness 10.6%
As can be seen here, using the capsule shape electrode slurry presoma of the present invention, conductive agent is in electrode slurry
It is distributed more uniform.
5. pole piece peel test force
Use electronic universal tester (speed of 50mm/min), between detection pole piece dressing and collector
Mechanical adhesion.
Embodiment 1 test result is: 0.45N
Comparative example 1 test result is: 0.42N
Embodiment 2 test result is: 0.76N
Comparative example 2 test result is: 0.76N
As can be seen here, using the electrode slurry presoma dissolving of the present invention to prepare electrode slurry, binding agent can
Fully dissolve and be scattered in electrode slurry.
6. solute effect
The packaging bag film 0.5g each embodiment prepared, adds in 100g N-Methyl pyrrolidone, 500rpm
Stirring 60min, observation packaging bag film dissolves dispersity again.
Embodiment 1 test result is: be completely dissolved dispersion
Embodiment 3 test result is: be completely dissolved dispersion
Embodiment 4 test result is: the most insoluble
As can be seen here, the packaging bag film prepared according to the method for the present invention, can again dissolve and be scattered in electrode
In slurry.
7. according to film layer rate of dissolution, it is judged that inorganic additive solubilization-aid effect
The packaging bag film 0.5g each embodiment prepared, adds in 100g N-Methyl pyrrolidone, 500rpm
Stirring 60min, that detects packaging bag film is completely dissolved required time.
Embodiment 1, dissolution time 50min；
Embodiment 5, dissolution time 43min；
Embodiment 6, dissolution time 45min；
Embodiment 7, dissolution time 41min；
As can be seen here, add inorganic additive and possess good hydrotropy effect.
8. according to 100 room temperature circulation volume conservation rates of battery, it is judged that inorganic additive effect
Test cycle performance of battery: at room temperature 20 DEG C, 1C discharge and recharge 100 times, collect battery 100 times
Circulation volume conservation rate:
Embodiment 1, capability retention 89%；
Embodiment 5, capability retention 92%；
Embodiment 6, capability retention 90%.
As can be seen here, MgCO is added3Battery capacity conservation rate can be improved, and effect is better than MgO.
9. according to shelving HF content in the electrolyte system after 48h, determine film to HF adsorption effect,
(lithium hexafluoro phosphate 1mol/L, solvent is that DMC:DEC:EMC=1:1:1, HF contain to initial electrolysis liquid
Amount is 1000wppm).
Embodiment 6 (filling 0.5g packaging bag film in bottle): 576wppm
Comparative example (blank bottle): 1123wppm
As can be seen here, MgO possesses the effect of absorption HF.
10. according to strain gauge registration, it is judged that add whether carbon fiber is favorably improved film tensile strength
Cut the thin film of fixing length and width, use electronic tensile machine stretching, pulling force during test film fracture
Embodiment 1, pulling force registration is 1.1N；
Embodiment 7, pulling force registration is 1.5N.
As can be seen here, add carbon fiber and improve film tensile strength.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited to above-mentioned reality
Execute the detail in mode, in the technology concept of the present invention, can be to the technical side of the present invention
Case carries out multiple simple variant, and these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technology described in above-mentioned detailed description of the invention is special
Levy, in the case of reconcilable, can be combined by any suitable means.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as its
Without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (14)
1. an electrode slurry presoma, it is characterised in that described electrode slurry presoma includes encapsulation
Bag film and be sealed in the electrode material in described packaging bag film, described packaging bag film dissolves in organic molten
Agent.
Electrode slurry presoma the most according to claim 1, wherein, described organic solvent is N-
Methyl pyrrolidone, main chain less than the ketone of 6 carbon atoms, dimethyl sulfoxide, dimethylformamide,
One or more in dimethyl acetylamide and oxolane；The most described organic solvent is N-methyl pyrrole
Pyrrolidone.
Electrode slurry presoma the most according to claim 1, wherein, in described packaging bag film
Electrode material is powder or paste；The thickness of described packaging bag film is 0.05-0.5mm, is preferably
0.1-0.3mm。
Electrode slurry presoma the most according to claim 1, wherein, the material of described packaging bag film
Material includes Kynoar, with the weight of packaging bag film, the content of described Kynoar
For 40-100 weight %, preferably 60-90 weight %.
Electrode slurry presoma the most according to claim 4, wherein, the material of described packaging bag film
Material also includes organic additive, and described organic additive is selected from Vingon, polyvinyl alcohol, poly-second two
Alcohol, polyacrylate, polymethacrylates, polyurethane, Pioloform, polyvinyl acetal, polyvingl ether,
One or more in Merlon and cellulose esters；With the weight of packaging bag film, described
The content of organic additive is 0-60 weight %, preferably 10-40 weight %.
Electrode slurry presoma the most according to claim 4, wherein, the material of described packaging bag film
Material also includes that inorganic additive, described inorganic additive contain the compound containing Group IIA element and/or contain
The compound of IV A race element, the most described inorganic additive is calcium carbonate, calcium sulfate, magnesium carbonate, sulfur
One or more in acid magnesium, calcium oxide, magnesium oxide, carbon fiber, white carbon black and white carbon；More preferably with
The weight of packaging bag film, the content of described inorganic additive is 1-10 weight %.
Electrode slurry presoma the most according to claim 1, wherein, described Kynoar
Number-average molecular weight is 100000-2000000.
Electrode slurry presoma the most according to claim 1, wherein, described electrode material includes
Electrode active material and binding agent；The most described electrode material includes electrode active material, conductive agent and glues
Knot agent, the most described conductive agent is powder or conductive agent serosity that range of viscosities is 10-100Pa*s.
9. an electrode slurry, it is characterised in that this electrode slurry is by appointing in claim 1-8
A described electrode slurry presoma of anticipating dissolves and obtains in organic solvent.
10. the preparation method of an electrode slurry, it is characterised in that the method includes:
(1) use organic solvent to carry out dissolving the polymeric material containing Kynoar and obtain solution,
Described solution is carried out film forming and obtains packaging bag film；
(2) electrode material is sealed with described packaging bag film, obtain electrode slurry presoma；
(3) electrode slurry is obtained by described electrode slurry presoma addition organic solvent carries out dissolving.
11. preparation methoies according to claim 10, wherein, at 20 DEG C to (-40) in step (1)
It is evaporated organic solvent at DEG C and carries out described film forming.
12. preparation methoies according to claim 10, wherein, the condition dissolved in step (1)
Including: temperature is 20-45 DEG C, and the time is 30-180min, the use of the polymeric material containing Kynoar
Amount is 2-10 weight % of consumption of organic solvent；In the presence of being dissolved in conductive agent serosity described in step (3)
Carry out；The number-average molecular weight of described Kynoar is 100000-2000000, with containing Kynoar
The weight of polymeric material, the content of described Kynoar is 40-100 weight %, excellent
Elect 60-90 weight % as；The described polymeric material containing Kynoar also includes organic additive, institute
State organic additive selected from Vingon, polyvinyl alcohol, Polyethylene Glycol, polyacrylate, poly-methyl
In acrylate, polyurethane, Pioloform, polyvinyl acetal, polyvingl ether, Merlon and cellulose esters
One or more；Preferably with the weight of the polymeric material containing Kynoar, described in have
The content of machine additive is 0-60 weight %, preferably 10-40 weight %；Described containing Kynoar
Polymeric material also includes that inorganic additive, described inorganic additive contain the compound containing Group IIA element
And/or the compound containing IV A race element, the most described inorganic additive is calcium carbonate, calcium sulfate, carbonic acid
One or more in magnesium, magnesium sulfate, calcium oxide, magnesium oxide, carbon fiber, white carbon black and white carbon；More
Preferably with the weight of the polymeric material containing Kynoar, containing of described inorganic additive
Amount is 1-10 weight %；Described electrode material includes electrode active material and binding agent, the most described electrode
Material includes that electrode active material, conductive agent and binding agent, described conductive agent are powder or range of viscosities is
The conductive agent serosity of 10-100Pa*s；The thickness of described packaging bag film is 0.05-0.5mm, is preferably
0.1-0.3mm。
13. 1 kinds of electrodes, it is characterised in that described electrode by the electrode slurry described in claim 9 or
The electrode slurry that in claim 10-12 prepared by preparation method described in any one is coated in electrode current collecting
On body, then carry out drying, roll-in, cut and obtain.
14. 1 kinds of lithium ion batteries, it is characterised in that this lithium ion battery contains claim 13 institute
The electrode stated.
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| CN106159214B (en) | 2019-09-13 |
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