CN113410426A - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
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- CN113410426A CN113410426A CN202110878344.2A CN202110878344A CN113410426A CN 113410426 A CN113410426 A CN 113410426A CN 202110878344 A CN202110878344 A CN 202110878344A CN 113410426 A CN113410426 A CN 113410426A
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- ion battery
- lithium
- active material
- lithium ion
- negative electrode
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 45
- 238000000576 coating method Methods 0.000 claims abstract description 32
- 239000011248 coating agent Substances 0.000 claims abstract description 29
- 239000007774 positive electrode material Substances 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 23
- 239000007773 negative electrode material Substances 0.000 claims description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 24
- 239000011230 binding agent Substances 0.000 claims description 22
- 239000006258 conductive agent Substances 0.000 claims description 22
- 229910002804 graphite Inorganic materials 0.000 claims description 12
- 239000010439 graphite Substances 0.000 claims description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 10
- 229910052744 lithium Inorganic materials 0.000 claims description 10
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 6
- 239000006229 carbon black Substances 0.000 claims description 6
- 239000004917 carbon fiber Substances 0.000 claims description 6
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 6
- 239000002041 carbon nanotube Substances 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 6
- -1 lithium nickel cobalt manganese aluminate Chemical class 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 5
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 5
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 4
- PFYQFCKUASLJLL-UHFFFAOYSA-N [Co].[Ni].[Li] Chemical compound [Co].[Ni].[Li] PFYQFCKUASLJLL-UHFFFAOYSA-N 0.000 claims description 4
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 claims description 3
- 239000004642 Polyimide Substances 0.000 claims description 3
- 229920002125 Sokalan® Polymers 0.000 claims description 3
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 3
- FBDMTTNVIIVBKI-UHFFFAOYSA-N [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] Chemical compound [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] FBDMTTNVIIVBKI-UHFFFAOYSA-N 0.000 claims description 3
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 3
- FRMOHNDAXZZWQI-UHFFFAOYSA-N lithium manganese(2+) nickel(2+) oxygen(2-) Chemical compound [O-2].[Mn+2].[Ni+2].[Li+] FRMOHNDAXZZWQI-UHFFFAOYSA-N 0.000 claims description 3
- SBWRUMICILYTAT-UHFFFAOYSA-K lithium;cobalt(2+);phosphate Chemical compound [Li+].[Co+2].[O-]P([O-])([O-])=O SBWRUMICILYTAT-UHFFFAOYSA-K 0.000 claims description 3
- 239000004584 polyacrylic acid Substances 0.000 claims description 3
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 claims description 2
- 239000012528 membrane Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 239000006183 anode active material Substances 0.000 description 2
- 239000010405 anode material Substances 0.000 description 2
- 239000006182 cathode active material Substances 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- ILXAVRFGLBYNEJ-UHFFFAOYSA-K lithium;manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[O-]P([O-])([O-])=O ILXAVRFGLBYNEJ-UHFFFAOYSA-K 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- 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
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- 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
- H01M4/134—Electrodes based on metals, Si or alloys
-
- 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
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- 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
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a lithium ion battery which is characterized in that the single-side coating surface density of the anode is 23-50 mg/cm2The single-side coating surface density of the negative electrode is 14-30 mg/cm2The positive electrode comprises a positive active material, wherein the particles of the positive active material are arranged and oriented consistently, and the included angle between the particles of the positive active material and the thickness direction of the pole piece of the positive electrode is not more than 30 degrees. The lithium ion battery provided by the invention can obviously improve the energy density of the battery.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery.
Background
Lithium ion batteries are widely used in digital electronics, energy storage and electric vehicle products due to their high specific energy, long cycle life, good safety and environmental friendliness. Due to the demand for slimness of products, batteries are required to have higher and higher energy densities. However, since the gram capacity and compaction of graphite have reached its limits, the energy density of conventional graphite system batteries is difficult to increase significantly.
In the prior art, in order to obtain higher energy density, a thick coating process is adopted in the industry to thicken a lithium ion battery diaphragm, so that the weight of the diaphragm in unit area is increased, and the using amounts of copper, aluminum foil and a diaphragm are reduced. However, by adopting a thick coating process, the ionic conductivity of the membrane after being coated with a thick layer can be obviously reduced, so that the battery capacity is exerted to a lower extent, and the energy density advantage is not obvious.
Therefore, how to increase the electric energy density of the thick-film lithium ion battery is an urgent technical problem to be solved in the field.
Disclosure of Invention
In order to solve the technical problem, the invention provides a lithium ion battery which can obviously improve the energy density of a thick film battery.
The lithium ion battery comprises a positive electrode and a negative electrode, and is characterized in that the single-side coating surface density of the positive electrode is 23-50 mg/cm2The single-side coating surface density of the negative electrode is 14-30 mg/cm2The positive electrode comprises a positive active material, wherein the particles of the positive active material are arranged and oriented consistently, and the included angle between the particles of the positive active material and the thickness direction of the pole piece of the positive electrode is not more than 30 degrees.
In the above lithium ion battery, preferably, the negative electrode includes a negative active material, and the negative active material particles are arranged and oriented consistently and have an included angle of not more than 30 degrees with the thickness direction of the negative electrode sheet.
In the above lithium ion battery, preferably, the positive electrode active material is at least one of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium manganate, lithium nickel cobalt aluminate, lithium iron phosphate, lithium manganese phosphate, lithium cobalt phosphate, lithium nickel manganese oxide, and lithium nickel cobalt manganese aluminate.
In the above lithium ion battery, preferably, the positive electrode further includes a first conductive agent, and the first conductive agent is at least one of carbon nanotubes, graphene, carbon fibers, conductive graphite, and carbon black.
In the above lithium ion battery, preferably, the positive electrode further includes a first binder, and the first binder is at least one of polyvinylidene fluoride, polytetrafluoroethylene, and polyimide.
In the lithium ion battery, the positive electrode active material is preferably 95 to 98 parts by mass, the first conductive agent is preferably 1 to 2.5 parts by mass, and the first binder is preferably 1 to 2.5 parts by mass.
In the lithium ion battery, the negative electrode active material is preferably graphite or silicon carbon.
In the above lithium ion battery, preferably, the negative electrode further includes a second conductive agent, and the second conductive agent is at least one of carbon nanotubes, graphene, carbon fibers, conductive graphite, and carbon black.
Preferably, the negative electrode of the lithium ion battery further includes a second binder, and the second binder is at least one of sodium carboxymethyl cellulose, lithium carboxymethyl cellulose, styrene-butadiene rubber, polyacrylic acid, and polyacrylonitrile.
In the above lithium ion battery, preferably, the negative electrode active material is 94 to 97 parts by mass, the second conductive agent is 1 to 2 parts by mass, and the second binder is 2 to 4 parts by mass.
The invention has the beneficial effects that:
the lithium battery provided by the invention has high coating film density, and the single-side coating surface density of the positive electrode is 23-50 mg/cm2The single-side coating surface density of the negative electrode is 14-30 mg/cm2According to the lithium battery provided by the invention, the orientations of the positive active material particles are consistent, and the included angles between the positive active material particles and the thickness direction of the positive pole piece are not more than 30 degrees (including parallel), so that the conduction path of lithium ions is remarkably shortened, and the ionic conductivity or the dynamic characteristic of the pole piece is remarkably improved. The pole piece is ensured to still have better ionic conductivity under the condition of large coating surface density, the defects of low ionic conductivity and low gram capacity exertion under the conventional thick coating are overcome, and therefore the energy density of the battery can be obviously improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view illustrating an arrangement orientation of active material particles of a positive electrode or a negative electrode of a lithium battery according to an embodiment of the present invention;
fig. 2 is a charging curve diagram of a group a battery and a group B battery according to an embodiment of the present invention;
fig. 3 is a discharge curve diagram of a group a battery and a group B battery according to a first embodiment of the present invention;
FIG. 4 is a graph comparing rate discharge curves of the group A battery and the group B battery according to the first embodiment of the present invention;
fig. 5 is data comparing discharge rate performance of the battery pack a and the battery pack B according to the first embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The lithium ion battery provided by the embodiment of the invention comprises a positive electrode and a negative electrode, wherein the single-side coating surface density of the positive electrode is 23-50 mg/cm2The single-side coating surface density of the negative electrode is 14-30 mg/cm2The positive electrode comprises a positive active material, wherein the particles of the positive active material are arranged and oriented consistently, and the included angle between the particles of the positive active material and the thickness direction of the pole piece of the positive electrode is not more than 30 degrees (including parallel).
In the lithium ion battery provided by the embodiment of the invention, preferably, the negative electrode includes a negative active material, wherein the negative active material particles are arranged and oriented consistently, and the included angle between the negative active material particles and the thickness direction of the pole piece of the negative electrode is not more than 30 degrees (including parallel). The anode active material particles or the cathode active material particles are arranged as shown in fig. 1, wherein a represents the anode active material particles or the cathode active material particles.
In order to achieve uniform particle orientation, a strong magnetic field is usually applied during pole piece coating, so that the particle orientation of the active material is uniform.
In the prior art, in order to obtain higher energy density, a thick coating process is adopted in the industry, and the membrane is made thick, so that the weight of the membrane per unit area is increased, and the using amount of copper, aluminum foil and the membrane is reduced. However, by adopting the thick film process, the ionic conductivity of the film after being coated is remarkably reduced, so that the battery capacity is exerted to a lower degree, and the energy density advantage is not obvious.
The lithium battery provided by the embodiment of the invention has high coating film density, and the single-side coating surface density of the anode is 23-50 mg/cm2The single-side coating surface density of the negative electrode is 14-30 mg/cm2The positive and negative active material particles are consistent in orientation and are correspondingly parallel to the thickness direction of the positive or negative pole piece, so that the conduction path of lithium ions can be obviously shortened, and the ionic conductivity or the dynamic characteristic of the pole piece is obviously improved. Therefore, the pole piece can still have better ionic conductivity under the condition of large coating surface density, so that the defects of low ionic conductivity and low gram capacity exertion under the conventional thick coating are overcome, and the energy density of the battery can be obviously improved.
According to the lithium ion battery provided by the embodiment of the invention, the positive active material is at least one of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium manganate, lithium nickel cobalt aluminate, lithium iron phosphate, lithium manganese iron phosphate, lithium cobalt phosphate, lithium nickel manganese oxide and lithium nickel cobalt manganese aluminate.
In the lithium ion battery provided by the embodiment of the invention, the positive electrode further comprises a first conductive agent, and the first conductive agent is at least one of carbon nano tube, graphene, carbon fiber, conductive graphite and carbon black.
According to the lithium ion battery provided by the embodiment of the invention, the positive electrode further comprises a first binder, and the first binder is at least one of polyvinylidene fluoride, polytetrafluoroethylene and polyimide.
According to the lithium ion battery provided by the embodiment of the invention, the mass part of the positive electrode active material is 95-98, the mass part of the first conductive agent is 1-2.5, and the mass part of the first binder is 1-2.5.
According to the lithium ion battery provided by the embodiment of the invention, the single-side coating surface density of the anode is 23-50 mg/cm 2.
According to the lithium ion battery provided by the embodiment of the invention, the negative active material is graphite or silicon carbon.
According to the lithium ion battery provided by the embodiment of the invention, the negative electrode further comprises a second conductive agent, and the second conductive agent is at least one of carbon nano tubes, graphene, carbon fibers, conductive graphite and carbon black.
According to the lithium ion battery provided by the embodiment of the invention, the negative electrode further comprises a second binder, and the second binder is at least one of sodium carboxymethyl cellulose, lithium carboxymethyl cellulose, styrene-butadiene rubber, polyacrylic acid and polyacrylonitrile.
In the lithium ion battery provided by the embodiment of the invention, the mass part of the negative electrode active material is 94-97, the mass part of the second conductive agent is 1-2, and the mass part of the second binder is 2-4, that is, the mass ratio of the negative electrode active material, the second conductive agent and the second binder is 94-97: 1-2: 2-4.
specific examples are provided below
Example one
Taking nickel cobalt lithium aluminate (NCA) as a positive electrode active material, and mixing the positive electrode active material, a conductive agent SP + CNT and a binder polyvinylidene fluoride (PVDF) according to a ratio of 96: 2: 2, mixing, and stirring by taking NMP as a solvent to obtain slurry. And uniformly coating the slurry on two sides of an aluminum foil, wherein the coating surface density is 32mg/cm2, and drying, rolling and slitting the aluminum foil for later use as a positive electrode material.
Mixing conventional graphite with a conductive agent SP and a binder CMC + SBR according to the active substances: conductive agent: binder 95.5: 1: 3.5, stirring the mixture into slurry by taking deionized water as a solvent, and uniformly coating the slurry on two sides of the copper foil to obtain a negative electrode material with the coating surface density of 19.7mg/cm 2. The negative electrode material is divided into two groups, one group is normally coated (code B), the other group is coated and simultaneously applied with a strong magnetic field (code A), the magnetic field intensity is 10000 Gauss, and the negative electrode material is dried, rolled and stripped for later use.
And respectively matching the anode materials with the A, B groups of cathode materials to prepare a battery core, and baking, injecting liquid, forming and degassing to obtain the lithium ion batteries, namely the A group of batteries and the B group of batteries.
The charging curves of the group a battery and the group B battery are shown in fig. 2, and the discharging curves of the group a battery and the group B battery are shown in fig. 3, and it can be seen that both the charging and discharging polarizations of the group a battery are smaller, and the discharging capacity of the group a battery is approximately 20% higher than that of the group B battery.
Fig. 4 is a graph comparing the discharge rate, fig. 5 is a graph comparing the discharge rate performance of the a-group battery and the B-group battery, and it can be seen that the discharge capacity of the a-group battery is significantly higher than that of the B-group battery under different currents.
Example two:
and manufacturing a positive electrode material and a negative electrode material, wherein the materials and the formula are the same as those in the first embodiment.
The positive electrode material coating surface density is 40mg/cm2, the negative electrode material coating surface density is 24.6mg/cm2, the coated negative electrode materials are divided into two groups, one group is normally coated (code number D), the other group is coated and simultaneously applied with a strong magnetic field (code number C), the magnetic field intensity is 10000 Gauss, and the D group negative electrode materials, the C group negative electrode materials and the positive electrode materials are prepared into batteries according to the method of the embodiment, so that D group batteries and C group batteries are respectively obtained.
Example three:
and manufacturing a positive electrode material and a negative electrode material, wherein the materials and the formula are the same as those in the first embodiment.
Wherein the coating surface density of the anode material is 48mg/cm2, and the coating surface density of the cathode material is 29.5mg/cm 2. The positive electrode material and the negative electrode material were fabricated into batteries according to the method of example, to obtain an F-group battery and an E-group battery.
Wherein the positive and negative poles of the F group of batteries are coated normally, the strong magnetic field is applied to the positive and negative poles of the E group of batteries while coating, and the magnetic field intensity is 10000 Gauss.
The batteries of examples two and three were subjected to discharge capacity tests at different rates, and the results are shown in the following table. Therefore, under the same surface density, by adopting the active substance with consistent particle orientation and approximately parallel to the thickness direction of the pole piece, the ionic conductivity of the thick membrane can be obviously improved, the discharge capacity of the battery is improved, and the energy density of the battery is improved.
The lithium ion battery provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The lithium ion battery comprises a positive electrode and a negative electrode, and is characterized in that the single-side coating surface density of the positive electrode is 23-50 mg/cm2The single-side coating surface density of the negative electrode is 14-30 mg/cm2The positive electrode comprises a positive active material, wherein the particles of the positive active material are arranged and oriented consistently, and the included angle between the particles of the positive active material and the thickness direction of the pole piece of the positive electrode is not more than 30 degrees.
2. The lithium ion battery of claim 1, wherein the negative electrode comprises a negative active material, and the negative active material particles are arranged and oriented consistently and have an included angle of no more than 30 degrees with the thickness direction of the pole piece of the negative electrode.
3. The lithium ion battery according to claim 1, wherein the positive electrode active material is at least one of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium manganate, lithium nickel cobalt aluminate, lithium iron phosphate, lithium iron manganese phosphate, lithium cobalt phosphate, lithium nickel manganese oxide, and lithium nickel cobalt manganese aluminate.
4. The lithium ion battery of claim 1, wherein the positive electrode further comprises a first conductive agent, and the first conductive agent is at least one of carbon nanotubes, graphene, carbon fibers, conductive graphite, and carbon black.
5. The lithium ion battery of claim 4, wherein the positive electrode further comprises a first binder, the first binder being at least one of polyvinylidene fluoride, polytetrafluoroethylene, and polyimide.
6. The lithium ion battery according to claim 5, wherein the positive electrode active material is 95 to 98 parts by mass, the first conductive agent is 1 to 2.5 parts by mass, and the first binder is 1 to 2.5 parts by mass.
7. The lithium ion battery according to claim 1, wherein the negative electrode active material is graphite or silicon carbon.
8. The lithium ion battery of claim 1, wherein the negative electrode further comprises a second conductive agent, and the second conductive agent is at least one of carbon nanotubes, graphene, carbon fibers, conductive graphite, and carbon black.
9. The lithium ion battery of claim 8, wherein the negative electrode further comprises a second binder, and the second binder is at least one of sodium carboxymethylcellulose, lithium carboxymethylcellulose, styrene-butadiene rubber, polyacrylic acid, and polyacrylonitrile.
10. The lithium ion battery according to claim 9, wherein the negative electrode active material is 94 to 97 parts by mass, the second conductive agent is 1 to 2 parts by mass, and the second binder is 2 to 4 parts by mass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110878344.2A CN113410426A (en) | 2021-07-30 | 2021-07-30 | Lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110878344.2A CN113410426A (en) | 2021-07-30 | 2021-07-30 | Lithium ion battery |
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|---|---|
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Application publication date: 20210917 |