CN108346801B - Positive electrode of lithium ion battery - Google Patents
Positive electrode of lithium ion battery Download PDFInfo
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- CN108346801B CN108346801B CN201710059693.5A CN201710059693A CN108346801B CN 108346801 B CN108346801 B CN 108346801B CN 201710059693 A CN201710059693 A CN 201710059693A CN 108346801 B CN108346801 B CN 108346801B
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—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
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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
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
A positive electrode of a lithium ion battery includes a first current collector, a positive electrode active material layer disposed at one side of the first current collector, and a first carbon material layer disposed between the first current collector and the positive electrode active material layer, wherein the positive electrode active material layer includes a plurality of first material particles having a graphene shell layer formed on surfaces of the first material particles.
Description
Technical Field
The present disclosure relates to lithium ion batteries, and particularly to a lithium ion battery with improved power storage capacity.
Background
With the development of technology and the attention of environmental awareness, secondary batteries are widely used in various fields, such as electric vehicles, mobile electronic devices or aerospace devices, and currently, the stored energy of secondary batteries does not meet the market demand, so many battery manufacturers are making great efforts to develop secondary batteries with high stored energy to solve the existing problems.
For example, taiwan patent publication No. I474543 proposes a lithium battery including an isolation layer, a positive electrode structure and a negative electrode structure, wherein the isolation layer has a first surface and a second surface opposite to the first surface, the positive electrode structure is disposed on the first surface and has a positive electrode layer and a positive electrode collector layer, two sides of the positive electrode layer are respectively connected to the first surface and the positive electrode collector layer, the negative electrode structure is disposed on the second surface and has a negative electrode layer and a negative electrode collector layer, two sides of the negative electrode layer are respectively connected to the second surface and the negative electrode collector layer, wherein the positive electrode collector layer and/or the negative electrode collector layer are mainly made of a first carbon material and a second carbon material, a ratio of a specific surface area of the first carbon material to a specific surface area of the second carbon material is in a range of 2 to 300, and in the positive electrode collector layer and/or the negative electrode collector layer, the weight ratio of the first carbon material to the second carbon material is (2): 1 to 1: 1, the first carbon material and the second carbon material are graphite powder.
In the above prior art, there is still room for improving the conductivity between the positive electrode current collecting layer and the positive electrode layer and between the negative electrode current collecting layer and the negative electrode layer, so as to increase the power storage capacity of the lithium ion battery.
Disclosure of Invention
The invention mainly aims to solve the problem of insufficient electric storage capacity of the conventional lithium ion battery.
In order to achieve the above object, the present invention provides a positive electrode of a lithium ion battery, including a first current collector, a positive electrode active material layer disposed on one side of the first current collector, and a first carbon material layer disposed between the first current collector and the positive electrode active material layer, wherein the positive electrode active material layer includes a plurality of first material particles having a graphene shell layer formed on one surface of the first material particles.
In one embodiment of the present invention, the first carbon material layer is a graphene layer having a diameter of L a between 1 μm and 50 μm and a number of layers between 1 and 10, wherein L a is a value obtained by raman spectroscopy.
From the above, the present invention can achieve the following effects compared with the prior art:
(1) disposing a large area graphene layer between the first current collector and the positive electrode active material layer, the graphene layer having a diameter of L a between 1 μm and 50 μm (the L a is a value obtained by raman spectroscopy), may enhance conductivity between the current collector and the active material layer.
(2) Since the active material particles in the positive electrode active material layer have the graphene shell layer, the conductivity of the active material particles can be improved, and the total electricity storage capacity of the lithium ion battery is improved.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is a schematic structural diagram of a lithium ion battery according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a second carbon material layer according to yet another embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings, wherein:
fig. 1 and fig. 2 show a schematic structural diagram of a lithium ion battery according to an embodiment of the invention, which includes a positive electrode 10, a negative electrode 20, and a separator 30, wherein the positive electrode 10 includes a first current collector 11, a positive electrode active material layer 12, and a first carbon material layer 13, and the first current collector 11 is made of aluminum, copper, iron, nickel, platinum, tungsten, molybdenum, tantalum, niobium, vanadium, chromium, titanium, zirconium, or a combination thereof. The positive electrode active material layer 12 is disposed on one side of the first current collector 11, in one embodiment, the positive electrode active material layer 12 includes a plurality of active material particles 121, the active material particles 121 include a first material particle 1210 and a graphene shell 1211 formed on one surface of the first material particle 1210, the active material particles 121 are stacked and contacted with each other, wherein the first material particle 1210 may be lithium iron phosphate, lithium nickel cobalt manganese, lithium cobaltate, lithium nickelate, lithium manganate or a combination thereof; the method for forming the graphene shell 1211 on the first material particle 1210 is not particularly limited, and for example, the graphene shell 1211 may be formed by coating a graphene on the surface of the first material particle 1210 by a puddle granulation method, and then baking the graphene at a baking temperature between 50 ℃ and 300 ℃, in which case the surface of the first material particle 1210 is partially or completely coated with the graphene.
The first carbon material layer 13 is disposed between the first current collector 11 and the positive electrode active material layer 12, and in the present invention, the first carbon material layer 13 is a graphene layer having a diameter of L a between 1 μm and 50 μm and a number of layers between 1 and 10, where L a is a value obtained by raman spectroscopy.
The negative electrode 20 is disposed separately from the positive electrode 10, and the negative electrode 20 includes a second current collector 21, a negative electrode active material layer 22, and a second carbon material layer 23, the second current collector 21 may be made of aluminum, copper, iron, nickel, platinum, tungsten, molybdenum, tantalum, niobium, vanadium, chromium, titanium, zirconium, or a combination thereof, the negative electrode active material layer 22 is disposed on one side of the second current collector 21, in one embodiment, the negative electrode active material layer 22 may be a currently available carbon material, in a preferred embodiment, the negative electrode active material layer 22 includes an L a carbon material with a diameter between 1 μm and 50 μm (wherein the L a is a value obtained by raman spectroscopy), such as a graphite, a graphene, or a combination thereof, the second carbon material layer 23 is disposed between the second current collector 21 and the negative electrode active material layer 22, in the present invention, the second carbon material layer 23 includes 1 to 10 layers 231 with a large area, and the graphene layer 231 has a diameter between 1 μm and 50 μm.
Please refer to fig. 2. In one embodiment, the second carbon material layer 23 includes a plurality of silicon particles 232, and the silicon particles 232 are all in contact with the graphene layer 231, wherein the silicon particles 232 have a particle size between 10nm and 100nm, such as a sphere composed of silylene. Because in the process of charging and discharging of the lithium ion battery, lithium ions can freely enter and exit the silicon particles 232, the volume of the silicon particles 232 is changed violently, if the silicon particles 232 with larger particle size are selected, the silicon particles 232 can be disintegrated to lose the effect of improving the electric storage capacity, so that the silicon particles 232 with smaller particle size relative to the lithium ions are selected, the silicon particles can be prevented from being disintegrated due to violent volume change, and the service life of the lithium ion battery is prolonged.
To strengthen the bonding between the silicon particles 232 and the graphene layer 231, in one embodiment, the surface of the silicon particles 232 is coated with a first coating layer 233, and the graphene layer 231 is coated with a second coating layer 234. There is no particular limitation on the materials of the first cladding layer 233 and the second cladding layer 234 as long as the first cladding layer 233 and the second cladding layer 234 can be connected by generating a chemical bond therebetween, such as cross-linking of the first cladding layer 233 and the second cladding layer 234, or connection of the first cladding layer 233 and the second cladding layer 234 by carrying opposite electrical properties, respectively, although the invention is not limited thereto.
Non-limiting examples of materials for the first cladding 233 include: non-limiting examples of the material having a sulfonic acid functional group such as polystyrene sulfonic acid sodium salt (poly (4-styrene sulfonate)), poly (2-acrylamide-2-methylpropanesulfonic acid) (poly (2-acrylamide-2-methyl-1-propylsulfonic acid)), a polymer having a carbon acid functional group, a cation exchange resin, polyvinyl alcohol (polyvinyl alcohol), and/or polyacrylic acid (polyacrylic acid) or polyacrylic acid sodium salt (poly (sodium acrylate) as the second coating layer 234 include polyquaternary ammonium salt, anion exchange resin, polyvinyl alcohol (polyvinyl alcohol), polydiallyldimethylammonium chloride (polydiallyldimethylammonium chloride), dodecyltrimethylammonium bromide (dodecyltrimethylammonium bromide), and polypropyleneimide propyl trimethylammonium chloride (polyacrylamide-N-propyltrimethylammonium chloride), Poly (3-methylpropionamido-propyltrimethylammonium chloride), poly (allylamine hydroxide), poly (dimethylaminomethylchloride) quaternary ammonium salt, and/or poly (dimethylaminomethylchloride) quaternary ammonium salt.
In order to further ensure the bonding force between the graphene layer 231 and the silicon particles 232, and to improve the conductive effect, thereby improving the charging and discharging efficiency of the secondary battery, a third coating layer 235 is further included on the surfaces of the first coating layer 233 and the second coating layer 234, so as to ensure that the silicon particles 232 are effectively contacted with the surface of the graphene layer 231. The material of the third coating layer 235 may be, for example, a carbon-containing conductive film, but the invention is not limited thereto.
The separator 30 is disposed between the positive electrode 10 and the negative electrode 20, and the material of the separator 30 may be Polyethylene (PE), Polypropylene (PP), or a combination thereof, which is not limited in the invention.
In summary, the graphene layers with large areas are respectively arranged between the first current collector and the positive electrode active material layer and between the second current collector and the negative electrode active material layer, so as to improve the conductivity between the current collectors and the active material layers; in addition, the surface of the first material particle of the positive electrode active material layer is provided with the graphene shell layer, so that the conductivity of the first material particle can be improved, and the total electricity storage capacity of the lithium ion battery is improved.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A positive electrode of a lithium ion battery, the lithium ion battery comprises the positive electrode, a negative electrode matched with the positive electrode and a separation film arranged between the positive electrode and the negative electrode, and the positive electrode is characterized by comprising:
a first current collector;
a positive electrode active material layer disposed on one side of the first current collector; and
a first carbon material layer disposed between the first current collector and the positive electrode active material layer;
wherein the positive electrode active material layer comprises a plurality of active material particles, the active material particles comprising a first material particle and a graphene shell layer formed on a surface of the first material particle;
wherein, the negative electrode that cooperates with this positive electrode includes: a second current collector, a second carbon material layer and a negative electrode active material layer, wherein the second carbon material layer comprises a plurality of silicon particles and a graphene layer in contact with the silicon particles, the surface of the silicon particle is coated with a first coating layer, the graphene layer is coated with a second coating layer, and a third coating layer is further included on the surface of the first coating layer and the second coating layer, wherein the first coating layer and the second coating layer are connected by generating a chemical bond;
the electric storage capacity of the lithium ion battery is improved by the structural arrangement of the positive electrode and the negative electrode.
2. The positive electrode of claim 1, wherein the first carbon material layer is a graphene layer having a diameter of L a between 1 μm and 50 μm and a number of layers between 1 and 10, wherein L a is a value obtained by raman spectroscopy.
3. The positive electrode of claim 1, wherein the first material particles are selected from the group consisting of lithium iron phosphate, lithium nickel cobalt manganese, lithium cobaltate, lithium nickelate, lithium manganate, and combinations thereof.
4. The positive electrode of claim 1, wherein the active material particles are prepared by coating a graphene on the surface of the first material particles, followed by baking at a temperature between 50 ℃ and 300 ℃.
5. The positive electrode of the lithium ion battery of claim 1, wherein the graphene shell layer completely covers the surface of the first material particles.
6. The positive electrode of claim 1, wherein the first current collector is selected from the group consisting of aluminum, copper, iron, nickel, platinum, tungsten, molybdenum, tantalum, niobium, vanadium, chromium, titanium, zirconium, and combinations thereof.
7. The positive electrode for a lithium ion battery according to claim 1, wherein the active material particles are stacked and in contact with each other.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710059693.5A CN108346801B (en) | 2017-01-24 | 2017-01-24 | Positive electrode of lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710059693.5A CN108346801B (en) | 2017-01-24 | 2017-01-24 | Positive electrode of lithium ion battery |
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| CN108346801A CN108346801A (en) | 2018-07-31 |
| CN108346801B true CN108346801B (en) | 2020-07-17 |
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Citations (9)
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| CN103545555A (en) * | 2012-07-13 | 2014-01-29 | 清华大学 | Preparation method of lithium ion battery |
| CN103545556A (en) * | 2012-07-13 | 2014-01-29 | 清华大学 | Preparation method of film lithium ion battery |
| CN103663435A (en) * | 2012-09-12 | 2014-03-26 | 铼钻科技股份有限公司 | Graphene reinforced composite material |
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| CN105226249A (en) * | 2015-09-11 | 2016-01-06 | 王晓亮 | A kind of 3 SiC 2/graphite alkene core-shell material and Synthesis and applications thereof with gap |
| CN105576197A (en) * | 2014-10-29 | 2016-05-11 | Oci有限公司 | Device for producing polymer dispersion solution of core-shell structured silicon nanoparticles |
| CN106058148A (en) * | 2015-04-17 | 2016-10-26 | 现代自动车株式会社 | Positive electrode for lithium ion battery and lithium ion battery using same |
| CN107293702A (en) * | 2016-04-11 | 2017-10-24 | 创奕能源科技股份有限公司 | The preparation method and lithium battery of high power lithium battery positive electrode |
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2017
- 2017-01-24 CN CN201710059693.5A patent/CN108346801B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545528A (en) * | 2012-07-13 | 2014-01-29 | 清华大学 | Lithium ion battery |
| CN103545555A (en) * | 2012-07-13 | 2014-01-29 | 清华大学 | Preparation method of lithium ion battery |
| CN103545556A (en) * | 2012-07-13 | 2014-01-29 | 清华大学 | Preparation method of film lithium ion battery |
| CN103663435A (en) * | 2012-09-12 | 2014-03-26 | 铼钻科技股份有限公司 | Graphene reinforced composite material |
| CN105576197A (en) * | 2014-10-29 | 2016-05-11 | Oci有限公司 | Device for producing polymer dispersion solution of core-shell structured silicon nanoparticles |
| CN106058148A (en) * | 2015-04-17 | 2016-10-26 | 现代自动车株式会社 | Positive electrode for lithium ion battery and lithium ion battery using same |
| CN104868106A (en) * | 2015-04-21 | 2015-08-26 | 常州第六元素材料科技股份有限公司 | Method for coating graphite anode material of lithium ion battery with graphene and application thereof |
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| CN107293702A (en) * | 2016-04-11 | 2017-10-24 | 创奕能源科技股份有限公司 | The preparation method and lithium battery of high power lithium battery positive electrode |
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| CN108346801A (en) | 2018-07-31 |
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