CN110380013A - Ultra high power density lithium fluorocarbon positive electrode for battery material and preparation method and application - Google Patents
Ultra high power density lithium fluorocarbon positive electrode for battery material and preparation method and application Download PDFInfo
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- CN110380013A CN110380013A CN201910348485.6A CN201910348485A CN110380013A CN 110380013 A CN110380013 A CN 110380013A CN 201910348485 A CN201910348485 A CN 201910348485A CN 110380013 A CN110380013 A CN 110380013A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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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
- H01M4/06—Electrodes for primary cells
- H01M4/08—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
- 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
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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
- H01M4/58—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
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/5835—Comprising fluorine or fluoride salts
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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
- H01M4/58—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
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
Abstract
The present invention is a kind of ultra high power density lithium fluorocarbon positive electrode for battery material and preparation method and application, the positive electrode include that the raw material of following component is mixed: fluorocarbons active material mass percent 80%；Super conductive carbon black mass percent 8%；Carbon nano-fiber mass percent 2%；Kynoar mass percent 10%.The present invention improves positive electrode using the method for two step hybrid conductive agents, and using carbon-coated aluminum foils as plus plate current-collecting body, the discharge current density for the lithium fluorocarbon battery being prepared is increased to 40A/g or more, realizes ultra high power density.Specific manifestation is as follows: the present invention is used as active material using the fluorocarbons active material of high-specific surface area, significantly improves imbibition of the positive electrode to electrolyte, liquid-keeping property, lowers ion and transmits resistance and reaction polarization.The present invention improves positive electrode using the method for two-step method hybrid conductive agent, makes to contact between conductive agent and fluorocarbons active material sufficiently, while be uniformly mixed positive electrode.
Description
Technical field
The present invention relates to a kind of ultra high power density lithium fluorocarbon positive electrode for battery material and preparation method and application,
Belong to battery technology field.
Background technique
With shared economic, mobile economic continuous development, people to the performance requirement of portable mobile power supply increasingly
Height, the various mating power supplys of portable electronic product develop to the direction of high-energy-density, high-power, long storage life, high security.
Lithium primary battery is since it is a variety of to be widely used in sensor, camera, pacemaker, aircraft etc. with excellent performance
Civilian and military field.Lithium primary battery common at present includes lithium manganese dioxide cell, lithium thionyl chloride cell, lithium dioxy
Change sulphur battery, lithium fluorocarbon battery, lithium Fe battery etc..Wherein, fluorocarbons is theoretical specific energy in lithium primary battery positive electrode
Highest, the practical specific energy of lithium fluorocarbon battery may be up to 250~800Wh/kg.In addition, lithium fluorocarbon battery has work electricity
The advantages that pressure is stablized, self discharge is small, highly-safe, can meet the application demand as low as medium discharge rate electrical equipment.But by
Restricted in fluorocarbons electron conduction by degree of fluorination, influence volumetric properties of the battery under high current operating condition, make its
Application in high-power component is limited.
Summary of the invention
The present invention is exactly directed to above-mentioned prior art situation and provides a kind of ultra high power density lithium fluorocarbon battery use
Positive electrode and preparation method and application, the purpose is to reduce the internal resistance of cell of this kind of lithium fluorocarbon battery, heavy-current discharge
Performance is more prominent, and power-performance is obviously improved, and the discharge current density of this kind of lithium fluorocarbon battery is made to reach 40A/g (unit
Positive-active quality) more than.
The present invention is achieved through the following technical solutions:
The invention proposes a kind of ultra high power density lithium fluorocarbon positive electrodes, it is characterised in that: the anode material
The component raw material and mass percent of material are as follows: conductive carbon black, 8%；Carbon nano-fiber, 2%；Kynoar, 10%.Fluorocarbons
Active material, 80%.
Further, the mass percentage of fluorine is 48~54% in the fluorocarbons active material, and BET specific surface area is greater than
200m2/ g, for example, 260m2/g。
Further, the BET specific surface area of fluorocarbons active material is 260m2/g。
Further, component raw material and mass percent that the fluorocarbons active material includes are as follows: fluorinated graphene, 75%
~80%；Fluorographite, carbon fluoride nano-tube, fluorination at least one of carbon black and fluorinated carbon fiber, 0~5%.
Further, the solvent of Kynoar solution is N-methyl pyrrolidones.
The invention also provides the preparation method of this kind of ultra high power density lithium fluorocarbon positive electrode, feature exists
In: steps of the method are:
Step 1: conductive carbon black is mixed with Kynoar solution；
Step 2: fluorocarbons active material and N-methyl pyrrolidones is added, is stirred, carbon nano-fiber is then added
It continuess to mix, uniform, pulp-like positive electrode is made.
Further, the mass percent of Kynoar solution is 5%.
The present invention has also been proposed the application of this kind of ultra high power density lithium fluorocarbon positive electrode, it is characterised in that: will
Positive electrode is coated in the surface of carbon-coated aluminum foils, and anode pole piece is made after dry.
Further, positive electrode coating, it is dry after with a thickness of 10~150 μm.
Further, carbon-coated aluminum foils after applying coated positive pole material dry 1~2h under 60~110 DEG C of normal pressures, then 100~
5h or more is dried in vacuo at 110 DEG C.
Beneficial effects of the present invention:
The present invention relates to a kind of ultra high power density lithium fluorocarbon positive electrode, the positive electrode includes following component
Raw material be mixed: fluorocarbons active material mass percent 80%；Super conductive carbon black mass percent 8%；Nano-sized carbon
Fiber quality percentage 2%；Kynoar mass percent 10%.The present invention is using the method for two step hybrid conductive agents to just
Pole material improves, and using carbon-coated aluminum foils as plus plate current-collecting body, by the electric discharge electricity for the lithium fluorocarbon battery being prepared
Current density is increased to 40A/g (unit positive-active quality) or more, realizes ultra high power density.Specific manifestation is as follows:
1. the present invention, as primary active material, significantly improves positive electrode pair using the fluorinated graphene of high-specific surface area
Ion transmission resistance and reaction polarization are lowered in the imbibition of electrolyte, liquid-keeping property.
2. the present invention improves positive electrode using the method for two-step method hybrid conductive agent, make conductive agent and fluorination stone
It is contacted sufficiently between black alkene, while is uniformly mixed positive electrode.
3. the present invention also helps two kinds of different-shape conductive agents using the method for two-step method hybrid conductive agent --- it is super
Multistage conductive network is constructed in the matching of conductive carbon black and carbon nano-fiber and its pattern between fluorinated graphene, significant to drop
Low cell resistance.Specifically, due to super conductive carbon black be nanometer spherical particle, it is pre-dispersed in bonding agent after again with fluorination
Graphene mixing, can make glued dose of the carbon black of zero dimension cladding and it is evenly dispersed in two-dimensional graphene sheet layer, bridge joint is led
Electrically poor fluorinated graphene piece.The one-dimensional carbon nano-fiber of secondary addition can hand over fluorinated graphene piece and carbon black mixt
It miscodes and close conductive network is made, it is similar to catch mechanism with the net in sedimentation theory, and carbon fiber is by sheet graphene and particle
Shape carbon black is combined into good accessible entirety, reduces contact resistance.
4. the present invention, as plus plate current-collecting body, keeps anode coating more uniform using carbon-coated aluminum foils, interface cohesion is more stable,
Reduce contact resistance.
5. ultra high power density lithium fluorocarbon battery of the invention can significantly reduce cell reaction resistance, pole piece contact electricity
Resistance, significantly improves high-rate battery discharge performance and active material utilization, has to lithium fluorocarbon power of battery performance is improved
Significance.
Detailed description of the invention
Fig. 1 is the performance characterization figure for the battery that embodiment 1 is prepared.
Fig. 2 is the performance characterization figure for the battery that comparative example 1 is prepared.
Fig. 3 is the performance characterization figure for the battery that comparative example 2 is prepared.
Fig. 4 is the performance characterization figure for the battery that comparative example 3 is prepared.
Specific embodiment
Further detailed description is done to preparation method of the invention below in conjunction with specific embodiment.It should be appreciated that
The following example is merely illustrative the ground description and interpretation present invention, and is not necessarily to be construed as limiting the scope of the invention.
In the range of all technologies realized based on above content of the present invention are encompassed by the present invention is directed to protect.
Experimental method used in following embodiments is conventional method unless otherwise specified；Institute in following embodiments
Reagent, material etc., are commercially available unless otherwise specified.
Embodiment 1:
The step of preparing ultra high power density lithium fluorocarbon battery of the present invention is as follows:
Step 1: the Kynoar solution of the super conductive carbon black of 0.8g and 20g mass fraction 5% is added in blender
30min is mixed, the solvent in Kynoar solution is N-methyl pyrrolidones；
Step 2: 8g fluorinated graphene and 70g N-methyl pyrrolidones is added, is stirred 1h, is then added 0.2g nanometers
Carbon fiber mixing 6h, is made uniform anode sizing agent, and wherein the fluorine content of fluorinated graphene is 52% mass percent, specific surface
Product is 260m2/g；
Step 3: gained anode sizing agent being uniformly coated in carbon-coated aluminum foils using blade coating, 150 μm of coating thickness；
4:110 DEG C of constant pressure and dry 1h of step, then anode pole piece is made in 110 DEG C of vacuum drying 8h.
Battery cathode is lithium foil, and lithium foil is with a thickness of 200 μm.
Anode, cathode and polypropylene diaphragm are assembled into 2016 type button cells.
The solute of electrolyte is 1.0mol/L lithium hexafluoro phosphate, and solvent is that (volume ratio is ethylene carbonate/dimethyl carbonate
1:1).Reservoir quantity is 150 μ l.Its performance is tested, as a result as shown in Figure 1.
Comparative example 1:
The step of preparing lithium fluorocarbon battery is as follows:
Step 1: by the super conductive carbon black of 1g, 8g fluorinated graphene, 70g N-methyl pyrrolidones and 20g mass fraction 5%
Kynoar solution stirrer for mixing 6h is added, the solvent in Kynoar solution is N-methyl pyrrolidones, system
At uniform anode sizing agent, wherein the fluorine content of fluorinated graphene is 52% mass percent, specific surface area 260m2/g；
Step 2: gained anode sizing agent being uniformly coated in carbon-coated aluminum foils using blade coating, 150 μm of coating thickness；
3:110 DEG C of constant pressure and dry 1h of step, then anode pole piece is made in 110 DEG C of vacuum drying 8h.
Battery cathode is lithium foil, and lithium foil is with a thickness of 200 μm.
Anode, cathode and polypropylene diaphragm are assembled into 2016 type button cells.
The solute of electrolyte is 1.0mol/L lithium hexafluoro phosphate, and solvent is that (volume ratio is ethylene carbonate/dimethyl carbonate
1:1).Reservoir quantity is 150 μ l.Its performance is tested, as a result as shown in Figure 2.
Comparative example 2:
The step of preparing lithium fluorocarbon battery is as follows:
Step 1: by the super conductive carbon black of 1g, 8g fluorinated graphene, 0.2g carbon nano-fiber, 70g N-methyl pyrrolidones
Stirrer for mixing 6h is added with the Kynoar solution of 20g mass fraction 5%, the solvent in Kynoar solution is nitrogen
Uniform anode sizing agent is made in methyl pyrrolidone, and wherein the fluorine content of fluorinated graphene is 52% mass percent, specific surface
Product is 260m2/g；
Step 2: gained anode sizing agent being uniformly coated in carbon-coated aluminum foils using blade coating, 150 μm of coating thickness；
3:110 DEG C of constant pressure and dry 1h of step, then anode pole piece is made in 110 DEG C of vacuum drying 8h.
Battery cathode is lithium foil, and lithium foil is with a thickness of 200 μm.
Anode, cathode and polypropylene diaphragm are assembled into 2016 type button cells.
The solute of electrolyte is 1.0mol/L lithium hexafluoro phosphate, and solvent is that (volume ratio is ethylene carbonate/dimethyl carbonate
1:1).Reservoir quantity is 150 μ l.Its performance is tested, as a result as shown in Figure 3.
Comparative example 3:
The step of preparing lithium fluorocarbon battery is as follows:
Step 1: the Kynoar solution of the super conductive carbon black of 0.8g and 20g mass fraction 5% is added in blender
30min is mixed, the solvent in Kynoar solution is N-methyl pyrrolidones；
Step 2: 8g fluorinated graphene and 70g N-methyl pyrrolidones is added, is stirred 1h, it is super that 0.2g is then added
Conductive carbon black mixing 6h, is made uniform anode sizing agent, and wherein the fluorine content of fluorinated graphene is 52% mass percent, compares table
Area is 260m2/g；
Step 3: gained anode sizing agent being uniformly coated in carbon-coated aluminum foils using blade coating, 150 μm of coating thickness；
4:110 DEG C of constant pressure and dry 1h of step, then anode pole piece is made in 110 DEG C of vacuum drying 8h.
Battery cathode is lithium foil, and lithium foil is with a thickness of 200 μm.
Anode, cathode and polypropylene diaphragm are assembled into 2016 type button cells.
The solute of electrolyte is 1.0mol/L lithium hexafluoro phosphate, and solvent is that (volume ratio is ethylene carbonate/dimethyl carbonate
1:1).Reservoir quantity is 150 μ l.Its performance is tested, as a result as shown in Figure 4.
From the point of view of the performance map for the battery that embodiment 1 is prepared, highest discharge current density is 40A/g.And it compares
From the point of view of the cycle performance figure for the super conductive carbon black+fluorinated graphene combination battery being prepared in example 1 using one-step method,
Highest discharge current density reaches 10A/g；Super conductive carbon black+the Nano carbon fibers being prepared in comparative example 2 using one-step method
From the point of view of the cycle performance figure of dimension+fluorinated graphene combination battery, highest discharge current density is 27A/g；It is adopted in comparative example 3
From the point of view of the cycle performance figure of the super conductive carbon black being prepared with two step method+fluorinated graphene combination battery, highest is put
Electric current density reaches 15A/g；It can be seen that super conductive carbon black is combined with carbon nano-fiber mass ratio 4/1+ fluorinated graphene to mentioning
High discharge current density increases power significant effect.
More than, embodiments of the present invention are illustrated.But the present invention is not limited to above embodiment.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (10)
1. a kind of ultra high power density lithium fluorocarbon positive electrode, it is characterised in that: the component raw material of the positive electrode and
Mass percent are as follows: conductive carbon black, 8%；Carbon nano-fiber, 2%；Kynoar, 10%.Fluorocarbons active material, 80%.
2. ultra high power density lithium fluorocarbon positive electrode according to claim 1, it is characterised in that: the fluorocarbons
The mass percentage of fluorine is 48~54% in active material, and BET specific surface area is greater than 200m2/g。
3. ultra high power density lithium fluorocarbon positive electrode according to claim 2, it is characterised in that: fluorination carbon activity
The BET specific surface area of material is 260m2/g。
4. ultra high power density lithium fluorocarbon positive electrode according to claim 1 or 2, it is characterised in that: the fluorine
Change component raw material and mass percent that carbon activity material includes are as follows: fluorinated graphene, 75%~80%；Fluorographite, fluorination
Carbon nanotube, fluorination at least one of carbon black and fluorinated carbon fiber, 0~5%.
5. ultra high power density lithium fluorocarbon positive electrode according to claim 1, it is characterised in that: Kynoar
The solvent of solution is N-methyl pyrrolidones.
6. the method for preparing ultra high power density lithium fluorocarbon positive electrode described in claim 1, it is characterised in that: the party
The step of method are as follows:
Step 1: conductive carbon black is mixed with Kynoar solution；
Step 2: fluorocarbons active material and N-methyl pyrrolidones is added, is stirred, carbon nano-fiber is then added and continues
Uniform, pulp-like positive electrode is made in mixing.
7. the method according to claim 6 for preparing ultra high power density lithium fluorocarbon positive electrode, it is characterised in that:
The mass percent of Kynoar solution is 5%.
8. a kind of application of ultra high power density lithium fluorocarbon positive electrode described in claim 1, it is characterised in that: will just
Pole material is coated in the surface of carbon-coated aluminum foils, and anode pole piece is made.
9. the application of ultra high power density lithium fluorocarbon positive electrode according to claim 8, it is characterised in that: anode
Material coating, it is dry after with a thickness of 10~150 μm.
10. the application of ultra high power density lithium fluorocarbon positive electrode according to claim 8, it is characterised in that: apply
Carbon-coated aluminum foils after coated positive pole material dry 1~2h under 60~110 DEG C of normal pressures, are then dried in vacuo 5h at 100~110 DEG C
More than.
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| CN116093256A (en) * | 2023-03-06 | 2023-05-09 | 中国科学院长春应用化学研究所 | High-rate lithium fluorocarbon battery anode and preparation method thereof |
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