CN107230774A - Cathode pole piece and lithium ion battery - Google Patents
Cathode pole piece and lithium ion battery Download PDFInfo
- Publication number
- CN107230774A CN107230774A CN201610168049.7A CN201610168049A CN107230774A CN 107230774 A CN107230774 A CN 107230774A CN 201610168049 A CN201610168049 A CN 201610168049A CN 107230774 A CN107230774 A CN 107230774A
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- CN
- China
- Prior art keywords
- pole piece
- active material
- cathode pole
- cathode
- current collector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
-
- 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
- H01M4/133—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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
-
- 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
-
- 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 present invention provides a kind of cathode pole piece and lithium ion battery.The cathode pole piece includes negative current collector and cathode membrane.The cathode membrane is formed at the one or both sides of the negative current collector.The cathode membrane includes：Inside active material layer, it is on the negative current collector and adjacent with the negative current collector, include the negative electrode active material for being capable of deintercalate lithium ions；And outside functional layer, on the inside active material layer and positioned at the side farthest away from the negative current collector of the cathode membrane, the outside functional layer includes Super P and binding agent, and not comprising the negative electrode active material for being capable of deintercalate lithium ions.Cryogenic property, power-performance and the high current that the cathode pole piece of the present invention can improve lithium ion battery rapidly fill charging cycle performance soon.
Description
Technical field
The present invention relates to cell art, more particularly to a kind of cathode pole piece and lithium ion battery.
Background technology
With the popularity more and more higher of lithium ion battery, application is more and more wider, and people are generally right
Cryogenic property, power-performance and the quick charge capability of lithium ion battery propose higher requirement.One
As for generally have two schemes the problem of to solve such.A kind of scheme is to change setting for electrochemical system
Meter, including positive plate, negative plate, electrolyte.But the redesign of critical material is related to a large amount of works
The matching of skill technology, project development process is very long, and human cost input is high, very risky.Another side
Case is to reduce the coating weight and compacted density of pole piece active material.But the coating of reduction active material
Weight and compacted density largely sacrifice the energy density of battery.
The content of the invention
In view of problem present in background technology, it is an object of the invention to provide a kind of cathode pole piece and lithium
Ion battery, its cryogenic property, power-performance and the high current that can improve lithium ion battery rapidly are filled soon
Charging cycle performance.
In order to achieve the above object, in one aspect of the invention, the invention provides a kind of cathode pole piece,
It includes：Negative current collector；And cathode membrane, it is formed at the one or both sides of the negative current collector.
The cathode membrane includes：Inside active material layer, on the negative current collector and with the negative pole
Collector is adjacent, includes the negative electrode active material for being capable of deintercalate lithium ions；And outside functional layer, it is located at
Farthest away from the one of the negative current collector on the inside active material layer and positioned at the cathode membrane
Side, the outside functional layer includes Super P and binding agent, and not comprising being capable of deintercalate lithium ions
Negative electrode active material.
In another aspect of this invention, the invention provides a kind of lithium ion battery, it is included according to this hair
Cathode pole piece described in bright one side.
Relative to prior art, beneficial effects of the present invention are：
The cathode pole piece of the present invention improves the electronics conduction of pole piece interface and ionic conduction, improves negative pole pole
The pore distribution of piece, therefore lithium ion can not be largely being improved in the case of sacrifice energy density substantially
Cryogenic property, power-performance and the high current of battery fill charging cycle performance soon.
The present invention cathode pole piece preparation method it is simple, with low cost, be easy to volume production, have great warp
Ji benefit.
The cathode pole piece of the present invention is applied to high power battery core and has the battery core for filling demand soon.
Brief description of the drawings
Fig. 1 is the structural representation of the cathode pole piece of the present invention, wherein, 1 is negative current collector, and 2 are
Inside active material layer, 3 be outside functional layer.
Fig. 2 is the loop test curve of embodiment 1-5 and comparative example 1-3 lithium ion battery.
Fig. 3 is the low temperature discharge D.C. resistance of embodiment 1-5 and comparative example 1-3 lithium ion battery.
Embodiment
The following detailed description of the cathode pole piece and lithium ion battery according to the present invention.
Illustrate cathode pole piece according to a first aspect of the present invention first.
Reference picture 1, cathode pole piece according to a first aspect of the present invention, including：Negative current collector 1；With
And cathode membrane, it is formed at the one or both sides of the negative current collector.The cathode membrane includes：It is interior
Side active material layer 2, on the negative current collector 1 and adjacent with the negative current collector 1, bag
Containing the negative electrode active material for being capable of deintercalate lithium ions；And outside functional layer 3, positioned at the inside active
It is described outer on material layer 2 and positioned at the side farthest away from the negative current collector 1 of the cathode membrane
Side functional layer 3 includes Super P and binding agent, and not comprising the negative electrode active for being capable of deintercalate lithium ions
Material.Negative current collector 1 is the conductor for transmitting electric charge, can be the metal foils such as copper.
In cathode pole piece described according to a first aspect of the present invention, the Super P in outside functional layer 3
It is the conventional conductive agent of lithium ion battery, it has good contact performance and electronic conductivity with active material
Can, therefore outside functional layer 3 can effectively improve the electronics conduction of pole piece interface, so as to improve lithium ion battery
Dynamic performance.
In cathode pole piece described according to a first aspect of the present invention, Super P surface has higher work
Property, with good electrolyte wellability, the ability compared to active material its Electolyte-absorptive is stronger, because
This outside functional layer 3 also can effectively improve the conduction of pole piece interface ion, so as to improve the dynamic of lithium ion battery
Mechanical property.
In cathode pole piece described according to a first aspect of the present invention, for traditional cathode pole piece, contain
The active material layer for having graphite cathode active material causes when crossing roller cold pressing because pressure conduction is unbalanced
Pole piece is close to the place overvoltage of superficial layer, so that duct is largely killed, the polarization under big multiplying power electric current increases
Greatly.And Super P are amorphous carbon materials, hardness is high, the available buffer pressure conduction when crossing roller cold pressing,
Improve the pore passage structure of cathode pole piece, the liquid phase polarization under big multiplying power electric current is reduced, so as to improve lithium ion
The dynamic performance of battery.
In cathode pole piece described according to a first aspect of the present invention, the bonding in the outside functional layer 3
Agent is selected from the one or more in sodium carboxymethylcellulose (CMC), LA aqueous binders and SBR.
The LA aqueous binders can be LA-133.
In cathode pole piece described according to a first aspect of the present invention, Super P are in the outside functional layer 3
In percentage by weight be 40%~69%.
In cathode pole piece described according to a first aspect of the present invention, the outside functional layer 3 may include
Super P, CMC and LA-133, the percentage by weight of three is (40%~69%):(1%~10%):(30
%~50%).
In cathode pole piece described according to a first aspect of the present invention, the outside functional layer 3 may include
Super P, CMC and SBR, the percentage by weight of three is (40%~69%):(1%~10%):(30
%~50%).
In cathode pole piece described according to a first aspect of the present invention, the thickness of the outside functional layer 3 is
0.2 μm~10 μm.
In cathode pole piece described according to a first aspect of the present invention, the negative electrode active material is comprised at least
Graphite.Specifically, the negative electrode active material may be selected from graphite.Or the negative electrode active material is optional
From：Graphite；And silica-based nitride, silicon-base oxide, silicon substrate halide, silicon-base alloy, tinbase nitrogen
Compound, tin-based oxide, tinbase halide, kamash alloy, titanium-based nitride, titanium-based oxide, titanium
One or more in based alloy.
In cathode pole piece described according to a first aspect of the present invention, the cathode membrane includes at least one layer
Inside active material layer 2.
In cathode pole piece described according to a first aspect of the present invention, the inside active material layer 2 is also wrapped
Containing binding agent and conductive agent.The binding agent may be selected from sodium carboxymethylcellulose (CMC), LA water
One or more in property binding agent and SBR.The LA aqueous binders can be LA-133.Institute
State conductive agent and may be selected from Super P, conductive black etc..
Secondly lithium ion battery according to a second aspect of the present invention is illustrated.
Lithium ion battery according to a second aspect of the present invention, including it is described negative according to a first aspect of the present invention
Pole pole piece.
With reference to embodiment, the application is expanded on further.It should be understood that these embodiments are merely to illustrate
The application rather than limitation scope of the present application.
Embodiment 1
(1) preparation of cathode pole piece：By negative electrode active material graphite, CMC, Super P, LA-133
By weight 94.5%:2%:0.4%:It is mixed and stirred for uniformly, being had in 3.1% addition deionized water
The active material layer slurry of certain fluidity, the slurry is uniformly coated on into negative current collector, and (thickness is
9 μm of electrolytic copper foil) two sides, after drying formed inside active material layer.By Super P, CMC,
LA-133 is by weight 65%:2%:It is mixed and stirred for uniformly, being had in 33% addition deionized water
The functional layer slurry of certain fluidity, the slurry is uniformly coated on the surface of inside active material layer, thick
Spend for 2 μm, cathode pole piece is made after drying cold pressing.
(2) preparation of anode pole piece：By NCM333, Super P, Kynoar (PVDF) by weight
Amount compares 94%:3%:3% is added in 1-METHYLPYRROLIDONE (NMP) and is mixed and stirred for uniform, is had
There is the anode sizing agent of certain fluidity, anode sizing agent is uniformly coated on into plus plate current-collecting body, and (thickness is 14 μm
Aluminium foil) on, drying cold pressing after anode pole piece is made.
(3) preparation of electrolyte：By organic solvent ethylene carbonate (EC), dimethyl carbonate (DMC)
With methyl ethyl carbonate (EMC) EC in mass ratio:DMC:EMC=3:5:2 ratio mixing；Electrolyte is used
Lithium salts is LiPF6, concentration is 1.0mol/L.
(4) preparation of barrier film：It is mainly PE lithium ion battery barrier film, thickness using material
For 20 μm.
(5) preparation of lithium ion battery：By above-mentioned anode pole piece, cathode pole piece and barrier film successively
Battery core is obtained after superposition, electrolyte is injected, lithium ion battery is made after the processes such as chemical conversion.
The preparation process of embodiment 2-5 and comparative example 1-3 lithium ion battery remove table 1 in parameter not
With outside, preparation process is same as Example 1, and here is omitted.
The embodiment 1-5 of table 1 and comparative example 1-3 parameter
Next the performance test process of lithium ion battery is illustrated.
(1) embodiment 1-5 is entered with lithium ion battery made from comparative example 1-3 under the conditions of constant-temperature constant-current
Row charge and discharge cycles are tested.Constant test process temperature is 25 DEG C, and carrying out 3C/3C, (i.e. 3C charges, 3C
Electric discharge) charge and discharge cycles.
(2) by embodiment 1-5 and lithium ion battery made from comparative example 1-3 in -20 DEG C of progress arteries and veins of low temperature
Impulse electricity is tested, and test condition is discharge current 5C, discharge time 10s.
Fig. 2 is the loop test curve of embodiment 1-5 and comparative example 1-3 lithium ion battery.Fig. 3 is
Low temperature discharge D.C. resistance (DCR) value of embodiment 1-5 and comparative example 1-3 lithium ion battery.Knot
Fruit shows that the cycle performance of embodiment 1-5 lithium ion battery under 3C electric currents will be contrasted far superior to
Example 1-3.D.C. resistance of the embodiment 1-5 lithium ion battery under low temperature discharge significantly reduces, meaning
Taste the cryogenic property of lithium ion battery, power-performance and is largely increased.
Claims (10)
1. a kind of cathode pole piece, including：
Negative current collector；And
Cathode membrane, is formed at the one or both sides of the negative current collector；
Characterized in that,
The cathode membrane includes：
Inside active material layer, on the negative current collector and with the negative pole currect collecting body phase
Neighbour, includes the negative electrode active material for being capable of deintercalate lithium ions；And
Outside functional layer, on the inside active material layer and positioned at the cathode membrane most
Side away from the negative current collector, the outside functional layer includes Super P and binding agent,
And not comprising the negative electrode active material for being capable of deintercalate lithium ions.
2. cathode pole piece according to claim 1, it is characterised in that in the outside functional layer
One or more of the binding agent in sodium carboxymethylcellulose, LA aqueous binders and SBR.
3. cathode pole piece according to claim 1, it is characterised in that Super P are in the outside work(
Percentage by weight in ergosphere is 40%~69%.
4. the cathode pole piece according to any one of claim 1-3, it is characterised in that the outside
The thickness of functional layer is 0.2 μm~10 μm.
5. cathode pole piece according to claim 1, it is characterised in that the negative electrode active material is extremely
Graphite is included less.
6. cathode pole piece according to claim 5, it is characterised in that the negative electrode active material choosing
From graphite.
7. cathode pole piece according to claim 5, it is characterised in that the negative electrode active material choosing
From：
Graphite；And
Silica-based nitride, silicon-base oxide, silicon substrate halide, silicon-base alloy, tinbase nitride, tinbase
In oxide, tinbase halide, kamash alloy, titanium-based nitride, titanium-based oxide, titanium-base alloy
It is one or more of.
8. cathode pole piece according to claim 1, it is characterised in that the cathode membrane is included extremely
Few one layer of inside active material layer.
9. cathode pole piece according to claim 1, it is characterised in that the inside active material layer
Also include binding agent and conductive agent.
10. a kind of lithium ion battery, it is characterised in that the lithium ion battery is included according to claim
Cathode pole piece any one of 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610168049.7A CN107230774A (en) | 2016-03-23 | 2016-03-23 | Cathode pole piece and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610168049.7A CN107230774A (en) | 2016-03-23 | 2016-03-23 | Cathode pole piece and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107230774A true CN107230774A (en) | 2017-10-03 |
Family
ID=59932366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610168049.7A Pending CN107230774A (en) | 2016-03-23 | 2016-03-23 | Cathode pole piece and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107230774A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113410469A (en) * | 2018-10-31 | 2021-09-17 | 宁德时代新能源科技股份有限公司 | Negative pole piece, secondary battery and electric automobile |
| CN114068868A (en) * | 2020-07-31 | 2022-02-18 | 北京小米移动软件有限公司 | Pole piece, battery pack and manufacturing method of pole piece |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008097879A (en) * | 2006-10-06 | 2008-04-24 | Hitachi Maxell Ltd | Lithium ion secondary battery |
| CN105406029A (en) * | 2015-12-15 | 2016-03-16 | 珠海银隆新能源有限公司 | Preparation method of lithium-ion battery positive pole piece or negative pole piece |
-
2016
- 2016-03-23 CN CN201610168049.7A patent/CN107230774A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008097879A (en) * | 2006-10-06 | 2008-04-24 | Hitachi Maxell Ltd | Lithium ion secondary battery |
| CN105406029A (en) * | 2015-12-15 | 2016-03-16 | 珠海银隆新能源有限公司 | Preparation method of lithium-ion battery positive pole piece or negative pole piece |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113410469A (en) * | 2018-10-31 | 2021-09-17 | 宁德时代新能源科技股份有限公司 | Negative pole piece, secondary battery and electric automobile |
| CN113410469B (en) * | 2018-10-31 | 2022-06-03 | 宁德时代新能源科技股份有限公司 | Negative pole piece, secondary battery and electric automobile |
| CN114068868A (en) * | 2020-07-31 | 2022-02-18 | 北京小米移动软件有限公司 | Pole piece, battery pack and manufacturing method of pole piece |
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Application publication date: 20171003 |