CN108807982A - A kind of making formula of the positive electrode of high compacted density - Google Patents
A kind of making formula of the positive electrode of high compacted density Download PDFInfo
- Publication number
- CN108807982A CN108807982A CN201810752464.6A CN201810752464A CN108807982A CN 108807982 A CN108807982 A CN 108807982A CN 201810752464 A CN201810752464 A CN 201810752464A CN 108807982 A CN108807982 A CN 108807982A
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- China
- Prior art keywords
- powder
- positive electrode
- compacted density
- high compacted
- making formula
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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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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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
-
- 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
-
- 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 kind of making formulas of the positive electrode of high compacted density, including following quality to compare component：1% Kynoar powder, 1% carbon nanotube powder, 1% conductive black powder and 97%811 nickle cobalt lithium manganate powder, are mixed into N-Methyl pyrrolidone solvent by above-mentioned powder and are stirred the slurry of positive electrode is made.After the formula composition material reprocessing cold-press process of the present invention, the size particles mixing in former material can be effectively increased the compacted density of material, and improve the cycle performance of gram volume and battery.
Description
Technical field
The present invention relates to lithium battery for automobile power technical field more particularly to a kind of systems of the positive electrode of high compacted density
It is formulated.
Background technology
Recent study person improves the energy density of lithium ion battery by various means, as improved positive and negative pole material
Specific capacity, using nickelic ternary and silicon-carbon cathode etc., to improve the deficiency of its course continuation mileage.Ternary material is relative to ferric phosphate
Lithium material has higher specific capacity, real density 4.8g/cm3, actual compacted density that can only generally accomplish 3.4-
3.5g/cm3, excessively high compacted density can lead to ternary material Particle Breakage, fresh surfaces are exposed cause battery life drastically under
Drop.
That is, since the compositing formula of traditional positive electrode limits its anode pole piece density after molding, institute
How to propose that a kind of positive electrode formula that can improve anode pole piece density is industry problem urgently to be resolved hurrily.
Invention content
The present invention is in order to solve the above-mentioned deficiency of the prior art, it is proposed that a kind of making of the positive electrode of high compacted density
Formula.
In order to solve the above-mentioned technical problem, the present invention uses following technical scheme：A kind of positive electrode of high compacted density
Making formula, including following quality compares component：1% Kynoar powder, 1% carbon nanotube powder, 1% conductive black powder
And 97%811 nickle cobalt lithium manganate powder, it above-mentioned powder is mixed into N-Methyl pyrrolidone solvent is stirred positive electrode is made
Slurry.
Further, the 811 nickle cobalt lithium manganate powder use grain size for 4 μm of grain sizes, 7 μm of grain sizes, 14 μm of grain sizes three
The 811 nickle cobalt lithium manganate particle equal proportion of ternary of kind different-grain diameter is mixed.
Wherein, above-mentioned material polyvinyladine floride scientific name is Polyvinylidene Fluoride（English abbreviation PVDF）
The scientific name of carbon nanotube is Carbon Nanotube（English abbreviation CNT）；The scientific name of conductive black is superpli（English contracting
Write SP）；811 nickle cobalt lithium manganate scientific names are Lithium Nickel Cobalt Manganese Oxide（English abbreviation
NCM811）.
Grain size D50 will be 4 μm by the formula of the positive electrode of the present invention, 7 μm, 14 μm of ternary granulated equal proportion mix,
And anode pole piece is prepared into according to formula of size 1%PVDF, 1%CNT, 1%SP, 97%NCM811, it is and negative after 3.5g/cm3 is cold-pressed
Pole piece, isolation film, electrolyte are assembled into soft-package battery, and carry out the loop test of 3C at 4.2v.By positive plate along cross section
Carry out Ar ion polishings, it can be seen that internal particle arrangement is close, and particle does not have Fragmentation Phenomena appearance.
Compared with prior art, after formula composition material of the invention reprocessing cold-press process, the size particles in former material
Mixing can be effectively increased the compacted density of material, and improve the cycle performance of gram volume and battery.
Description of the drawings
Fig. 1 is cross-sectional scans figure after the C groups cold pressing in the embodiment of the present invention；
Fig. 2 is cross-sectional scans figure after the D groups cold pressing in the embodiment of the present invention；
Fig. 3 is the 3C cyclic curve figures under C groups and D groups 4.2V in the embodiment of the present invention.
Specific implementation mode
Invention is described in detail with reference to the accompanying drawings and examples.
Embodiment：Experimental Comparison
It chooses sintering and obtains the NCM811 materials of different-grain diameter, D50 is respectively 4 μm, 7 μm, 14 μm；Etc. weight take three kinds of D50's
Material is uniformly mixed, and obtains the ternary NCM811 of mixing grain size.Setting experiment group, wherein 4 μm, 7 μm, 14 μm of grain size and
It is respectively tetra- groups of A, B, C, D to mix grain size, and then each group of positive electrode is made using N-Methyl pyrrolidone solvent respectively
Slurry is cold-pressed after coated, baking.
Design cold pressing densification is respectively 3.4g/cm3,3.5g/cm3,3.6g/cm3.Tetra- groups of pole pieces of A, B, C, D are pressed respectively
These three densification are cold-pressed, and under the premise of pole piece is not broken, are pressed onto target densification.Cold pressing tape transport rated design is 0.6m/
s.Broken belt situation such as table 1 is cold-pressed under different group difference densification：
Broken belt situation of 1 variable grain of table under different densification
According to upper table, the pole piece that will be cold-pressed under not broken belt（C groups 3.5g/cm3With D groups 3.5/cm3）It carries out section and cuts sample preparation, system
Quadrat method takes the mode that argon ion polishes.
Positive plate sample after polishing is observed into its cross section under scanning electron microscope.As a result it refers to such as Fig. 1 and 2.From sweeping
Tracing（Attached drawing 1 and Fig. 2）In as can be seen that C groups ternary material particle in 3.5g/cm3Under conditions of occurred it is significantly broken
Broken phenomenon, and D groups hybrid particles are cold-pressed under the conditions of the densification of 3.5g/cm3, particle has very by way of size mixing
Good compactness, occurs almost without the phenomenon that Particle Breakage.
In addition, Fig. 3 is referred to, by the 3.5g/cm of C and D groups3Positive plate and same negative plate, isolation film, electrolyte
It is assembled into soft-package battery, carries out the test of electrical property.
Wherein C groups 3.5g/cm3Specific capacity is 181.3mAh/g, and D groups 3.5g/cm3Specific capacity is 182.6mAh/g.This is
Because D groups are arranged in pairs or groups by size particles, little particle large specific surface area, the lithium ion among particle is easy deintercalation and comes out, to
There is higher capacity.
In addition, two groups of batteries carry out the experiment of 3C charge and discharge at 4.2v respectively, as shown in figure 3, C group battery core capacity is possessed
Obviously decaying faster, this is because more fresh surface exposures come out after Particle Breakage, occurs more secondary rate with electrolyte
Reaction two causes material structure mutation unstable, to the reduction of capacity rapidly.
Only several embodiments of the present invention are expressed for above-described embodiment, the description thereof is more specific and detailed, but can not
Therefore understands that for the limitation to the scope of the claims of the present invention.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, these are all within the scope of protection of the present invention.
Therefore, patent of the present invention and protection domain should be subject to the appended claims.
Claims (2)
1. a kind of making formula of the positive electrode of high compacted density, which is characterized in that compare component including following quality：1% is poly- inclined
Vinyl fluoride powder, 1% carbon nanotube powder, 1% conductive black powder and 97%811 nickle cobalt lithium manganate powder, above-mentioned powder is mixed
Enter N-Methyl pyrrolidone solvent and is stirred the slurry that positive electrode is made.
2. the making formula of the positive electrode of high compacted density as described in claim 1, it is characterised in that：811 nickel cobalt
Mangaic acid lithium powder use grain size for 4 μm of grain sizes, 7 μm of grain sizes, 14 μm of grain sizes three kinds of different-grain diameters 811 nickle cobalt lithium manganate of ternary
Particle equal proportion is mixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810752464.6A CN108807982A (en) | 2018-07-10 | 2018-07-10 | A kind of making formula of the positive electrode of high compacted density |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810752464.6A CN108807982A (en) | 2018-07-10 | 2018-07-10 | A kind of making formula of the positive electrode of high compacted density |
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| CN108807982A true CN108807982A (en) | 2018-11-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110233241A (en) * | 2019-07-08 | 2019-09-13 | 无锡市明杨新能源有限公司 | Fast charging type lithium ion battery |
| CN111261931A (en) * | 2018-12-01 | 2020-06-09 | 深圳格林德能源集团有限公司 | Method for rapidly determining electrolyte amount of high-compaction nickel cobalt manganese oxide lithium battery |
| CN112798630A (en) * | 2019-11-13 | 2021-05-14 | 天津国安盟固利新材料科技股份有限公司 | Sample preparation method for representing element distribution uniformity |
| CN113451548A (en) * | 2020-03-25 | 2021-09-28 | 比亚迪股份有限公司 | Lithium iron phosphate positive plate, preparation method thereof and lithium iron phosphate lithium ion battery |
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| CN102664268A (en) * | 2012-05-09 | 2012-09-12 | 北京好风光储能技术有限公司 | Composite electrode active particle and preparation method and application thereof |
| CN102983355A (en) * | 2012-12-25 | 2013-03-20 | 天津市捷威动力工业有限公司 | Lithium ion battery capable of being subjected to high-rate charge and discharge and preparation method thereof |
| CN106654169A (en) * | 2016-12-31 | 2017-05-10 | 山东精工电子科技有限公司 | Positive electrode plate of lithium ion battery and preparation method for positive electrode plate |
| CN107195858A (en) * | 2017-04-17 | 2017-09-22 | 深圳市比克动力电池有限公司 | Lithium ion battery, anode sizing agent, anode pole piece and preparation method |
-
2018
- 2018-07-10 CN CN201810752464.6A patent/CN108807982A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664268A (en) * | 2012-05-09 | 2012-09-12 | 北京好风光储能技术有限公司 | Composite electrode active particle and preparation method and application thereof |
| CN102983355A (en) * | 2012-12-25 | 2013-03-20 | 天津市捷威动力工业有限公司 | Lithium ion battery capable of being subjected to high-rate charge and discharge and preparation method thereof |
| CN106654169A (en) * | 2016-12-31 | 2017-05-10 | 山东精工电子科技有限公司 | Positive electrode plate of lithium ion battery and preparation method for positive electrode plate |
| CN107195858A (en) * | 2017-04-17 | 2017-09-22 | 深圳市比克动力电池有限公司 | Lithium ion battery, anode sizing agent, anode pole piece and preparation method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111261931A (en) * | 2018-12-01 | 2020-06-09 | 深圳格林德能源集团有限公司 | Method for rapidly determining electrolyte amount of high-compaction nickel cobalt manganese oxide lithium battery |
| CN110233241A (en) * | 2019-07-08 | 2019-09-13 | 无锡市明杨新能源有限公司 | Fast charging type lithium ion battery |
| CN112798630A (en) * | 2019-11-13 | 2021-05-14 | 天津国安盟固利新材料科技股份有限公司 | Sample preparation method for representing element distribution uniformity |
| CN113451548A (en) * | 2020-03-25 | 2021-09-28 | 比亚迪股份有限公司 | Lithium iron phosphate positive plate, preparation method thereof and lithium iron phosphate lithium ion battery |
| CN113451548B (en) * | 2020-03-25 | 2022-09-09 | 比亚迪股份有限公司 | Lithium iron phosphate positive plate, preparation method thereof and lithium iron phosphate lithium ion battery |
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Application publication date: 20181113 |