CN102412387A - Positive pole of lithium ion battery, and manufacturing method for positive pole, and lithium ion battery - Google Patents
Positive pole of lithium ion battery, and manufacturing method for positive pole, and lithium ion battery Download PDFInfo
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- CN102412387A CN102412387A CN2010102912780A CN201010291278A CN102412387A CN 102412387 A CN102412387 A CN 102412387A CN 2010102912780 A CN2010102912780 A CN 2010102912780A CN 201010291278 A CN201010291278 A CN 201010291278A CN 102412387 A CN102412387 A CN 102412387A
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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
The invention discloses a positive pole of a lithium ion battery. The positive pole comprises a current collector, an active layer which is coated on the current collector, and a protection coating which is coated on the active layer; the active material of the active layer is at least one of lithium nickelate and a modified compound of lithium nickelate; and the active material of the protection coating is at least one of lithium manganate, and a modified compound of lithium manganate. The invention also relates to a manufacturing method for the lithium ion battery and a lithium-ion secondary battery using the positive pole. In the positive pole, a high-safety coating is coated on the surface of a positive plate of the conventional modified compound of lithium nickelate or lithium manganate, and the coating comprises at least one of the lithium manganate and the modified compound thereof to prevent main components, namely nickel-containing positive pole active materials from oxidizing electrolyte, insulate heat released by reduction of high-valence nickel, and prevent the phenomenon that the temperature of the local part of electrolyte is too high and the local part is combusted so as to fulfill the aim of improving safety of the battery.
Description
Technical field
The present invention relates to the lithium ion battery field, more specifically, the lithium ion battery that relates to a kind of lithium ion cell positive and preparation method thereof and use this positive pole.
Background technology
Along with developing rapidly of field of batteries, people to all kinds of power supplys require increasingly high, wherein lithium rechargeable battery, memory-less effect high, in light weight with its voltage, have extended cycle life and many superior functions such as non-environmental-pollution are widely used.Lithium ion battery mainly comprises as a kind of chemical power source: battery container, be sealed in pole piece and nonaqueous electrolytic solution in the battery container; Wherein, pole piece comprises anode, negative pole and barrier film, and positive and negative electrode contains the positive electrode active materials and the negative active core-shell material that can embed reversiblely and deviate from lithium ion respectively.Negative active core-shell material commonly used is mainly the material with carbon element with layer structure, like graphite.And positive electrode active materials commonly used mainly contains cobalt acid lithium (LiCoO
2), lithium nickelate (LiNiO
2), spinel lithium manganate LiMn
2O
4, LiFePO 4 LiFePO
4And their modified compound, for example: LiNi
1-xCo
xO
2(0<x<1).
Wherein, contain the positive electrode active materials of nickel element owing to have very high capacity density, energy density and higher specific discharge capacity, in the battery that usually is applied to capacity density is had relatively high expectations, like battery of mobile phone, Notebook Battery etc.But its decomposition temperature under charged state is low, poor heat stability; Promptly when battery is in Charging state, this type material can deviate from lithium ion and the nickel that produces high valence state (like Ni
4+); The nickel of high valence state has strong oxidizing property; Be easy to the organic solvent of oxidation electrolyte and discharge a large amount of heat and cause the battery thermal runaway, can make battery that burning even blast take place when serious, so use the lithium ion battery of the nickeliferous material (except the material of the nickel that mixes on a small quantity) of main component as positive electrode active materials; Often all there is potential safety hazard, burning even blast can take place when carrying out the battery lancing test.
In order to improve the fail safe of the nickeliferous lithium ion anode active material of main component, people have carried out modifications such as doping, coating to it, but effect is all not obvious, lithium nickelate after the modification such as LiNi
0.80Co
0.15Al
0.05O
2, still can contact and oxidation electrolyte with electrolyte, the test of battery acupuncture performance still can't be up to standard.
In order to improve the security performance of battery; Chinese patent CN2754223Y discloses a kind of lithium ion battery, and this battery and common battery difference are, the blank collector that outermost one circle of Battery Pole Core or a few circle are designed to not have dressing; Battery is in acupuncture course like this; What at first pierce through is outermost one circle or a few circle of pole piece, and short dot is the aluminium foil and the Copper Foil collector of the blank of both positive and negative polarity, and such short circuit is equivalent to a kind of external short circuit; The collector of positive/negative plate, electrolyte, barrier film and afterbody forms a loop; It is little more a lot of than the heat that the direct contact of both positive and negative polarity discharges that lithium ion is moved to the heat that anodal, such short circuit process discharges through electrolyte and barrier film from negative pole, and heat is not concentrated on the point and produces.Because the resistance of aluminium foil and Copper Foil is very little, and the heat that produces during short circuit can in time be dispersed, the temperature of battery and interior pressure increase less in addition.This method can make battery acupuncture moment be short-circuited and discharge part energy equably, reduces the direct catalytic severity of acupuncture later stage both positive and negative polarity and reduces the local heat that produces, thereby improve the security performances such as acupuncture of battery.But reach obvious effects; Need to increase the so blank collector of several circles; So blank collector is the duration of short circuit that causes of contact long enough just directly, and the energy of release is just abundant, and local heat production is excessive and thermal runaway takes place in the time of just can not making acupuncture to the both positive and negative polarity of dressing.But increase too much blank collector, can reduce the space availability ratio of battery, reduce the capacity and the energy density of battery, battery can't be met the demands; If enclose blank collector and only increase by one, it is too short that blank collector directly contacts the duration of short circuit that causes, the acupuncture performance of battery also can't be up to standard.
Summary of the invention
The present invention is intended to solve the thermal stability that has the lithium ion cell positive that adopts the positive electrode active materials making that contains nickel element in the prior art, the technical problem of poor safety performance.
In order to solve the problems of the technologies described above; The invention provides a kind of lithium ion cell positive; Comprise: collector and be coated on the active layer on the said collector, wherein, said lithium ion cell positive also comprises the protective finish that is coated on the said active layer; The active material of said active layer is selected from least a in lithium nickelate and the modified compound thereof, and the active material of said protective finish is selected from least a in LiMn2O4 and the modified compound thereof.
The present invention also provides the preparation method of above-mentioned lithium ion cell positive, comprises the steps: to adopt first slurry that collector is carried out applying the first time, obtains being covered with the electrode of active layer after the oven dry; On said active layer, adopt second slurry to carry out applying the second time then; Obtain said positive pole behind oven dry, the compressing tablet; Wherein, Active material in said first slurry is selected from least a in lithium nickelate and the modified compound thereof, and the active material in said second slurry is selected from least a in LiMn2O4 and the modified compound thereof.
The present invention further provides a kind of lithium ion battery, comprising: battery container, be sealed in pole piece and nonaqueous electrolytic solution in the battery container; Said pole piece comprises anode, negative pole and barrier film; Wherein, said just very aforesaid positive pole.
Lithium ion cell positive of the present invention passes through the coating at surface-coated one deck high security of the positive plate of existing lithium nickelate and modified compound thereof, and the coating of this high security comprises LiMn
2O
4Or LiMn
2O
4Modified compound; Can prevent of the oxidation of the nickeliferous positive electrode active materials of main component to electrolyte; And the heat of isolating high price nickel reduction release; Prevent that the electrolyte local temperature is too high and burn, thereby reach the purpose that improves battery safety, the battery lancing test of consulting embodiment of the invention 1-3 is all qualified; And,,, and have higher capacity and energy density so the battery that adopts lithium ion cell positive of the present invention to make is not only safe because the material that this protective finish adopts also is the positive electrode active materials of lithium ion battery.
Embodiment
Lithium ion battery of the present invention comprises battery container, is sealed in pole piece and nonaqueous electrolytic solution in the battery container; Said pole piece comprises anode, negative pole and barrier film.
Wherein, described negative pole is stirred by negative active core-shell material and corresponding binding agent, dispersant, solvent, forms slurry, is coated on the collector and dries, makes behind the compressing tablet.As the collector that is used for negative pole, can be Copper Foil, stainless steel foil, nickel foil, shape can be mesh-like, paper tinsel shape.Material with carbon element or the carbon alloy material etc. of said negative active core-shell material for can embed and deviate from lithium ion reversiblely; The described material with carbon element that can embed reversiblely and deviate from lithium ion; Like the product of roasting of native graphite, Delanium, coke, carbon black, RESEARCH OF PYROCARBON, carbon fiber and organic polymer, the carbonaceous material of preferably mainly forming by graphite material (like native graphite, Delanium); Described carbon alloy material is like silicon-carbon alloy, tin carbon alloy etc.Described binding agent can be one or more in fluorine resins such as polytetrafluoroethylene, Kynoar and polyethylene, the polyvinyl alcohol; Dispersant can be a cellulose; Solvent can be one or more in N-methyl pyrrolidone, dimethyl formamide, absolute ethyl alcohol, the deionized water.
Described electrolyte is non-aqueous electrolyte.To electrolyte wherein, the electrolytic salt that can use common nonaqueous electrolytic solution to use, for example LiPF
6, LiBF
4, LiAsF
6, LiClO
4, LiSbF
6, LiCl, LiBr, LiCF
2SO
3Deng lithium salts, consider from the oxidation stability angle, preferably select LiPF for use
6, LiClO4, LiBF
4, LiAsF
6In one or more.The electrolyte solvent for use is an organic solvent; Can be vinyl carbonate, propylene carbonate, ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, 1; 1-or 1; 2-dimethoxy ethane, 1, one or more in 2-diethoxy ethane, oxolane, 2-methyltetrahydrofuran, methyl phenyl ethers anisole, ether, N-methyl pyrrolidone, dimethyl formamide, acetonitrile, propionitrile, chlorine nitrile, the ethyl acetate.
Described barrier film can be nonwoven fabrics, synthetic resin microporous barrier; The preferential synthetic resin microporous barrier that uses specifically has polyethene microporous membrane, microporous polypropylene membrane, polyethylene polypropylene composite micro porous film, polyolefin microporous film etc., wherein is again preferred with the polyolefin microporous film.
Main points of the present invention are the positive pole of lithium ion battery; Said positive pole; Comprise: collector, be coated on the active layer on the said collector; And be coated on the protective finish on the said active layer, and the active material of active layer is selected from least a in lithium nickelate and the modified compound thereof, and the active material of protective finish is selected from least a in LiMn2O4 and the modified compound thereof.
Lithium ion cell positive of the present invention passes through the protective finish at surface-coated one deck high security of the positive plate of the modified compound of existing lithium nickelate or lithium nickelate, and the coating of this high security comprises LiMn
2O
4Or LiMn
2O
4Modified compound, conductive agent and binding agent.Because LiMn
2O
4And the high volence metal ion oxidizability of modified compound is not very strong, and the heat that its reduction discharges is also fewer, so fail safe is very good; Through being set, this protective finish can keep apart positive electrode active materials that contains nickel and electrolyte; Thereby avoided of the oxidation of high price nickel to electrolyte; And this protective finish can also be isolated the heat that the reduction of high price nickel discharges; Prevent that electrolyte from burning owing to temperature is too high, thereby improve the fail safe of battery; And, because the material that this protective finish adopts also is anode active material of lithium ion battery, i.e. LiMn
2O
4Or LiMn
2O
4Modified compound, have charge/discharge capacity and excellent cycle performance, less to the capacity of battery and energy density influence, so the battery that adopts lithium ion cell positive of the present invention to make is not only safe, and have very high capacity and energy density.
But,,, must guarantee the content of the active material of active layer in order to satisfy the capacity requirement of battery because the specific discharge capacity of LiMn2O4 and modified compound thereof is lower compared to lithium nickelate and modified compound thereof.Simultaneously; In order to guarantee that protective finish can effectively reach the purpose that improves battery safety; The content of the active material of protective finish can not be too small, and preferably, the active material of said active layer is 2 ~ 20 with the quality of the active material of said protective finish than scope; More preferably, the active material of said active layer is 3 ~ 10 with the quality of the active material of said protective finish than scope.
The lithium nickelate among the present invention and the structural formula of modified compound thereof are LiNi
1-ZN
ZO
2, wherein, M is at least a among element M g, Ca, Sr, Ba, Ti, Cr, Fe, Co, Cu, the Al, the Z value is 0～0.5.The material that the said structure formula is contained all can use, and is not limited to LiNiO
2Structure, thus the chemical property in a certain respect (for example specific discharge capacity, normal temperature, high temperature cyclic performance, storge quality, security performance or the like) of this positive electrode can be improved.Preferably use LiNi in the present invention
0.80Co
0.15Al
0.05O
2, LiNi
0.5Co
0.2Mn
0.3O
2Material.
The LiMn2O4 among the present invention and the structural formula of modified compound thereof are Li
1+XMn
2-YM
YO
4, wherein, M is at least a among element M g, Ca, Sr, Ba, Ti, Cr, Fe, Co, Ni, Cu, the Al, and the X value is-0.10～0.25, and the Y value is 0～0.5.The material that the said structure formula is contained all can use, and is not limited to LiMn
2O
4Structure, thus the chemical property in a certain respect (for example specific discharge capacity, normal temperature, high temperature cyclic performance, storge quality, security performance or the like) of this positive electrode improved.The preferred LiMn that uses among the present invention
2O
4, Li
1.1Mn
1.8Ni
0.2O
4Material.
The preparation method of the positive pole of above-mentioned lithium ion battery comprises the steps:
Step 1, adopt first slurry that collector is carried out coating first time, contain at least a, binding agent, conductive agent and solvent in lithium nickelate and the modified compound thereof in said first slurry, obtain being covered with the electrode of active layer after the oven dry;
Step 2, on active layer, adopt second slurry to carry out applying second time, contain at least a, binding agent, conductive agent and solvent in LiMn2O4 and the modified compound thereof in said second slurry, dry, obtain said positive pole behind the compressing tablet.
Among the present invention; The collector that applies slurry the first time that carrying contains lithium nickelate and modified compound thereof can be processed by any electric conducting material that in the lithium battery environment, shows inertia; Can be aluminium foil, stainless steel foil, nickel foil, shape can be mesh-like, paper tinsel shape, preferred aluminium foil.
Apply for the first time of the present invention and apply the slurry that is adopted for the second time and all binding agent is dissolved in solvent and adds positive electrode active materials and mix and prepare; Mixing speed is controlled to be 300～6000rpm; Mixing time is controlled to be 0.2～10 hour, and coating for the first time can be identical with solvent with the binding agent that the second time, coating was adopted.Described solvent comprises in the conventional anode active material composition any solvent commonly used, like in N-methyl pyrrolidone, dimethyl formamide, the absolute ethyl alcohol one or more, and preferred N-N-methyl-2-2-pyrrolidone N-(NMP).Described binding agent comprises any binding agent commonly used in the conventional anode active material composition; Like in fluorine resins such as polytetrafluoroethylene, Kynoar and polyethylene, the polyvinyl alcohol one or more; As long as this binding agent can be dissolved in the employed solvent, preferred polyvinylidene fluoride (PVDF) among the present invention.In the present invention; The content of solvent, binding agent and positive electrode active materials is not strict; But should be enough to the viscosity that provides suitable, so that composition can easily be coated on the collector, be benchmark with the active material of 100 weight portions; The content of preferred said solvent is 40 ~ 90 weight portions, and the content of preferred said binding agent is 0.5 ~ 5.5 weight portion.
Also can add the conductive agent of strengthening battery conductive property in the slurry of the present invention; This conductive agent comprises the conductive agent any commonly used that improves anode active material composition conductivity; A kind of as in carbon black, the graphite type material; Preferred acetylene black is benchmark with the active material of 100 weight portions, and the content of preferred said conductive agent is 1.0 ~ 6.5 weight portions.
Coating method of the present invention is a pull pulp type, and still, principle according to the present invention is understood that coating method also can adopt jet printing type or whitewash modes such as coating.
The manufacture method of lithium ion battery of the present invention is the manufacture method of the lithium ion battery of routine; Through with the above-mentioned positive pole that makes, adopt takeup type or stacked to constitute pole piece with negative pole and barrier film; Again this pole piece is put into battery case, welding block, fluid injection, make lithium ion battery after sealing, changing into.
The following example can more help to explain the present invention, should be understood that these embodiment are to further explanation of the present invention and explanation, do not constitute any limitation the present invention.
Embodiment 1
According to existing lithium ion battery manufacture method, be LiNi with active material earlier
0.80Co
0.15Al
0.05O
2Slurry (other compositing formula of slurry is identical with coating paste) be coated on the aluminium foil, the materials amount is 13.35g, after the oven dry, on aluminium foil, forms active layer.The coating paste for preparing is coated on the active layer, coating paste contains LiMn again
2O
4, conductive agent acetylene black, binding agent PVDF and solvent NMP, the mass ratio of four kinds of compositions is 100:4:3:70, the materials amount is 4.45g; Obtain positive plate behind oven dry, the compressing tablet; With the solvent N-N-methyl-2-2-pyrrolidone N-NMP of the binding agent polyvinylidene fluoride PVDF of the native graphite, 5% (weight) of 95% (weight) and surplus mix, apply, oven dry, compressing tablet, make negative plate after being cut into specified size; Barrier film is polyethylene, polypropylene composite diaphragm paper; The electrolyte of electrolyte is lithium hexafluoro phosphate LiPF
6, solvent is the mixed organic solvents of vinyl carbonate, ethylene carbonate, diethyl carbonate, concentration is 1 mol;
Above-mentioned positive plate, barrier film and negative plate are stacked successively, be wound into cylindrical pole piece, this pole piece is put in the cylindrical steel, weld block, fluid injection, seal, change into, can make 18650 type column lithium ion battery A1 of high security;
Randomly draw 100 battery A1 and carry out lancing test, testing procedure is following: continue to charge to 4.2V with the 1C electric current, cut-off current is 100mA, thrusts the center of battery fully with the speed of 8mm/s with the pin of diameter 3mm.Test result is that the phenomenon of 100 battery lancing tests is battery leakage, and it is all qualified to test.
Embodiment 2
According to existing lithium ion battery manufacture method, be LiNi with active material earlier
0.5Co
0.2Mn
0.3O
2Slurry be coated on the aluminium foil, the materials amount is 14.50g, after the oven dry, on aluminium foil, forms active layer.The coating paste for preparing is coated on the active layer, coating paste contains LiMn again
2O
4, conductive agent acetylene black, binding agent PVDF and solvent NMP, the weight ratio of four kinds of compositions is 100:4:3:70, the materials amount is 3.62g; Obtain positive plate behind oven dry, the compressing tablet; Positive plate, barrier film and negative plate are stacked successively, be wound into cylindrical electric core, should put in the cylindrical steel by the electricity core, weld block, fluid injection, seal, change into, can make 18650 type column lithium ion battery A2 of high security.Randomly draw 100 battery A1 and carry out lancing test, testing procedure is identical with embodiment 1, and test result is that the phenomenon of 100 battery lancing tests is battery leakage, and it is all qualified to test.
Embodiment 3
The active material that coating paste in the present embodiment contains is Li
1.1Mn
1.8Ni
0.2O
4, other makes lithium ion battery A3 with embodiment 1, randomly draws 100 battery A1 and carries out lancing test, and testing procedure is identical with embodiment 1, and test result is that the phenomenon of 100 battery lancing tests is battery leakage, and it is all qualified to test.
Comparative Examples 1
According to existing lithium ion battery manufacture method, be LiNi with active material
0.80Co
0.15Al
0.05O
2Anode sizing agent be coated on the aluminium foil, the dressing amount is 13.35g, oven dry back compressing tablet is processed positive plate; Positive plate, barrier film and negative plate are stacked successively; Be wound into cylindrical electric core; Outermost one circle plus plate current-collecting body aluminium foil and all not dressing of negative current collector Copper Foil is designed to blank collector, should put in the cylindrical steel by the electricity core; Weld block, fluid injection, seal, change into, make 18650 type column lithium ion battery B1.Randomly draw 100 battery B1 and carry out lancing test, testing procedure is identical with embodiment 1, and test result is that the phenomenon of 38 battery lancing tests is a battery leakage, and the phenomenon of all the other 62 battery lancing tests is a battery explosion, and qualification rate is 38%.
Comparative Examples 2
According to existing lithium ion battery manufacture method,, be LiNi with active material according to the lithium ion battery manufacture method of routine
0.80Co
0.15Al
0.05O
2And LiMn
2O
4Anode sizing agent be coated on (LiNi on the aluminium foil
0.80Co
0.15Al
0.05O
2: LiMn
2O
4=3:1), the dressing amount is 17.80g, oven dry back compressing tablet is processed positive plate; Positive plate, barrier film and negative plate are stacked successively; Be wound into cylindrical electric core; Outermost one circle plus plate current-collecting body aluminium foil and all not dressing of negative current collector Copper Foil is designed to blank collector, should put in the cylindrical steel by the electricity core; Weld block, fluid injection, seal, change into, can make 18650 type column lithium ion battery B1.Randomly draw 100 battery B2 and carry out lancing test, testing procedure is identical with embodiment 1, and test result is that the phenomenon of 25 battery lancing tests is a battery leakage, 27 battery explosions, and 48 battery burnings, qualification rate is 25%.
Claims (11)
1. lithium ion cell positive; Comprise: collector and be coated on the active layer on the said collector; It is characterized in that; Said lithium ion cell positive also comprises the protective finish that is coated on the said active layer, and the active material of said active layer is selected from least a in lithium nickelate and the modified compound thereof, and the active material of said protective finish is selected from least a in LiMn2O4 and the modified compound thereof.
2. positive pole according to claim 1 is characterized in that, the structural formula of said lithium nickelate and modified compound thereof is:
LiNi
1-ZN
ZO
2；
In the formula, 0≤Z≤0.5, N is selected from least a element among Mg, Ca, Sr, Ba, Ti, Cr, Fe, Ni, Co, Cu, the Al.
3. positive pole according to claim 1 is characterized in that, the structural formula of said LiMn2O4 and modified compound thereof is:
Li
1+XMn
2-YM
YO
4；
In the formula ,-0.10≤X≤0.25,0≤Y≤0.5, M is selected from least a element among Mg, Ca, Sr, Ba, Ti, Cr, Fe, Co, Cu, the Al.
4. positive pole according to claim 1 is characterized in that, the active material of said active layer is 2 ~ 20 with the quality of the active material of said protective finish than scope.
5. positive pole according to claim 1 is characterized in that said protective finish also contains conductive agent and binding agent, and said binding agent is one or more in fluorine resin, polyethylene, the polyvinyl alcohol; Said conductive agent is a kind of in carbon black, the graphite; Active material with 100 weight portions is a benchmark, and the content of said conductive agent is 1.0 ~ 6.5 weight portions, and the content of said binding agent is 0.5 ~ 5.5 weight portion.
6. a method for preparing like each said lithium ion cell positive in the right 1 to 5 is characterized in that, comprises the steps: to adopt first slurry that collector is carried out applying the first time, obtains being covered with the electrode of active layer after the oven dry; On said active layer, adopt second slurry to carry out applying the second time then; Obtain said positive pole behind oven dry, the compressing tablet; Wherein, The active material that contains in said first slurry is selected from least a in lithium nickelate and the modified compound thereof, and the active material that contains in said second slurry is selected from least a in LiMn2O4 and the modified compound thereof.
7. the preparation method of lithium ion cell positive according to claim 6 is characterized in that, the structural formula of said lithium nickelate and modified compound thereof is:
LiNi
1-ZN
ZO
2；
In the formula, 0≤Z≤0.5, N is selected from least a element among Mg, Ca, Sr, Ba, Ti, Cr, Fe, Ni, Co, Cu, the Al.
8. the preparation method of lithium ion cell positive according to claim 6 is characterized in that, the structural formula of said LiMn2O4 and modified compound thereof is:
Li
1+XMn
2-YM
YO
4；
In the formula ,-0.10≤X≤0.25,0≤Y≤0.5, M is selected from least a element among Mg, Ca, Sr, Ba, Ti, Cr, Fe, Co, Cu, the Al.
9. the preparation method of lithium ion cell positive according to claim 6 is characterized in that, also contains binding agent, conductive agent and solvent in said first slurry and second slurry; Said binding agent is one or more in fluorine resin, polyethylene, the polyvinyl alcohol; Said conductive agent is a kind of in carbon black, the graphite; Said solvent is one or more in N-methyl pyrrolidone, dimethyl formamide, the absolute ethyl alcohol.
10. the preparation method of lithium ion cell positive according to claim 9; It is characterized in that the mass ratio of active material, binding agent, conductive agent and solvent in said first slurry and second slurry is 100: (0.5 ~ 5.5): (1.0 ~ 6.5): (40 ~ 90).
11. a lithium ion battery comprises: battery container, be sealed in pole piece and nonaqueous electrolytic solution in the battery container; Said pole piece comprises anode, negative pole and barrier film; It is characterized in that, said just very like any described positive pole of claim 1-5.
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Cited By (7)
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| CN102881861A (en) * | 2012-09-26 | 2013-01-16 | 中南大学 | High-temperature lithium ion battery anode slice |
| JP2016207636A (en) * | 2015-04-17 | 2016-12-08 | 現代自動車株式会社Ｈｙｕｎｄａｉ Ｍｏｔｏｒ Ｃｏｍｐａｎｙ | Positive electrode for lithium ion battery and lithium ion battery using the same |
| CN107482208A (en) * | 2017-10-10 | 2017-12-15 | 合肥国轩高科动力能源有限公司 | A kind of method of modifying of nickel ion doped |
| CN107611479A (en) * | 2017-09-08 | 2018-01-19 | 广东天劲新能源科技股份有限公司 | Lithium ion power battery electrolyte and lithium rechargeable battery |
| CN109768220A (en) * | 2018-12-28 | 2019-05-17 | 东莞凯德新能源有限公司 | A method of reducing lithium ion battery self discharge |
| CN110752350A (en) * | 2019-11-02 | 2020-02-04 | 河南电池研究院有限公司 | Preparation method of soft package lithium ion battery positive electrode functional coating for relieving deposition of metal ions on negative electrode |
| CN113675370A (en) * | 2021-09-01 | 2021-11-19 | 珠海冠宇电池股份有限公司 | Positive plate and lithium ion battery |
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| CN102881861A (en) * | 2012-09-26 | 2013-01-16 | 中南大学 | High-temperature lithium ion battery anode slice |
| CN102881861B (en) * | 2012-09-26 | 2015-08-19 | 中南大学 | A kind of high-temperature lithium ion battery anode slice |
| JP2016207636A (en) * | 2015-04-17 | 2016-12-08 | 現代自動車株式会社Ｈｙｕｎｄａｉ Ｍｏｔｏｒ Ｃｏｍｐａｎｙ | Positive electrode for lithium ion battery and lithium ion battery using the same |
| CN107611479A (en) * | 2017-09-08 | 2018-01-19 | 广东天劲新能源科技股份有限公司 | Lithium ion power battery electrolyte and lithium rechargeable battery |
| CN107611479B (en) * | 2017-09-08 | 2022-10-11 | 广东天劲新能源科技股份有限公司 | Lithium ion power battery electrolyte and lithium ion secondary battery |
| CN107482208A (en) * | 2017-10-10 | 2017-12-15 | 合肥国轩高科动力能源有限公司 | A kind of method of modifying of nickel ion doped |
| CN107482208B (en) * | 2017-10-10 | 2019-09-27 | 合肥国轩高科动力能源有限公司 | A kind of method of modifying of nickel ion doped |
| CN109768220A (en) * | 2018-12-28 | 2019-05-17 | 东莞凯德新能源有限公司 | A method of reducing lithium ion battery self discharge |
| CN110752350A (en) * | 2019-11-02 | 2020-02-04 | 河南电池研究院有限公司 | Preparation method of soft package lithium ion battery positive electrode functional coating for relieving deposition of metal ions on negative electrode |
| CN113675370A (en) * | 2021-09-01 | 2021-11-19 | 珠海冠宇电池股份有限公司 | Positive plate and lithium ion battery |
| CN113675370B (en) * | 2021-09-01 | 2024-01-05 | 珠海冠宇电池股份有限公司 | Positive plate and lithium ion battery |
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Application publication date: 20120411 |