CN105185938A - Anode of lithium-ion battery and lithium-ion battery prepared from same - Google Patents
Anode of lithium-ion battery and lithium-ion battery prepared from same Download PDFInfo
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- CN105185938A CN105185938A CN201510431623.9A CN201510431623A CN105185938A CN 105185938 A CN105185938 A CN 105185938A CN 201510431623 A CN201510431623 A CN 201510431623A CN 105185938 A CN105185938 A CN 105185938A
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- ion battery
- lithium ion
- negative
- aluminium oxide
- lithium
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 112
- 239000011248 coating agent Substances 0.000 claims abstract description 39
- 238000000576 coating method Methods 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 119
- 239000007773 negative electrode material Substances 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 12
- 238000009826 distribution Methods 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 8
- 239000003792 electrolyte Substances 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 6
- 239000008187 granular material Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 6
- 239000011148 porous material Substances 0.000 abstract description 6
- 239000012528 membrane Substances 0.000 abstract description 4
- 239000013543 active substance Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 16
- 230000004888 barrier function Effects 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 239000004698 Polyethylene Substances 0.000 description 9
- 229920000573 polyethylene Polymers 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 239000004743 Polypropylene Substances 0.000 description 8
- 229920001155 polypropylene Polymers 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 239000002033 PVDF binder Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007600 charging Methods 0.000 description 2
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 238000001467 acupuncture Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- OVAQODDUFGFVPR-UHFFFAOYSA-N lithium cobalt(2+) dioxido(dioxo)manganese Chemical compound [Li+].[Mn](=O)(=O)([O-])[O-].[Co+2] OVAQODDUFGFVPR-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to an anode of a lithium-ion battery and a lithium-ion battery prepared from the same. The anode of the lithium-ion battery comprises an anode base material layer, an anode active substance layer, and an aluminum oxide micro-pore coating which can replace traditional lithium-ion battery PP and PE isolating membranes. The aluminum oxide micro-pore coating on the surface of the anode of the lithium-ion battery not only has relatively high mechanical intensity, but also has good electrolyte-keeping capability, avoids the phenomenon of closing holes at a high temperature, furthermore guarantees a battery to have better high-temperature adaptability in a temperature application scope, and is applicable for a high-power lithium-ion battery.
Description
Technical field
The present invention relates to a kind of negative electrode for lithium ion battery and obtained lithium ion battery thereof, belong to technical field of lithium ion.
Background technology
Lithium ion battery because its voltage is high, specific energy is large, have extended cycle life, security performance is good etc., and advantage is widely used in modern society.Lithium ion battery progressively instead of conventional batteries in the parts such as mobile phone, portable computer, video camera, camera.Wherein high multiplying power lithium ion battery is on probation in electric automobile, by one of major impetus power supply becoming 21 century electric automobile.
The performance of barrier film determines the interfacial structure, internal resistance etc. of lithium ion battery, directly affects the characteristics such as the capacity of lithium ion battery, circulation and security performance, and the barrier film of excellent performance has important effect to the combination property improving battery.Diaphragm material the most frequently used is at present the polyolefin-based porous film of high strength, filming, as polypropylene (PP) and polyethylene (PE) micro-pore septum.But, polypropylene (PP) single-layer septum exists that cost is high, the mechanical strength of film is lower, and closed pore temperature is higher, about the defect of about 160 DEG C, and the fusing-off temperature of polyethylene (PE) single-layer septum is on the low side, cause high-temperature shrinkage rate comparatively large, the shortcomings such as film strength is low, poor safety performance.Present stage there are some researches show at membrane surface coated with nano aluminum oxide film, can improve the fail safe of lithium ion battery, and its main theoretical basis is that aluminum oxide film is compared PP or PE and had better mechanical strength, is heated and does not shrink.
But, the aluminium oxide selected at present is nano alumina particles, causes the internal resistance of cell significantly to rise owing to applying blocked up meeting, so coating thickness is no more than 5um usually, but apply the thinner barrier effect reducing again aluminum oxide coating layer, the fail safe of battery is promoted simultaneously and also have a greatly reduced quality.In addition, because aluminum oxide coating layer still needs to rely on conventional P P or PE barrier film, many drawbacks of PP, PE barrier film do not obtain substantive solution yet.Therefore, propose a kind of film thickness appropriateness, do not need again the lithium ion battery negative relying on conventional membrane to seem particularly important.
Summary of the invention
The lithium ion battery that the object of this invention is to provide a kind of negative electrode for lithium ion battery preparation method and adopt this negative pole to prepare.Its prominent features is to adopt at negative electrode active material surface-coated one deck microporous alumina aluminized coating to replace conventional lithium ion battery PP, PE barrier film, and then improves the security feature of battery and promote the high rate cyclic characteristic of battery.
To achieve these goals, the present invention adopts following technical scheme:
A kind of negative electrode for lithium ion battery, comprises base material of cathode layer from bottom to top, negative electrode active material layer, aluminium oxide micro porous coating.
In lithium ion battery negative of the present invention, the thickness of described aluminium oxide micro porous coating is between 10-30 μm.
In lithium ion battery negative of the present invention, the micropore size of described aluminium oxide micro porous coating is between 0.03-0.12 μm.
In lithium ion battery negative of the present invention, the porosity of described aluminium oxide micro porous coating is between 40-50%.
In lithium ion battery negative of the present invention, described aluminium oxide micro porous coating is by alpha-crystal form porous alumina ceramic granular materials by preparing slurry, so through the negative electrode active material layer surface-coated thickness that rolling be the film of 10 ~ 30 μm and obtained;
Wherein, described alpha-crystal form porous alumina ceramic granular materials has following characteristic: (1) even particle size distribution, granule interior aperture is moderate, by selecting, different-grain diameter distributes, the alumina ceramic grain material of different pore size distribution can control the pore-size distribution of the aluminium oxide micro porous coating prepared, and then can obtain the good path of lithium ion.(2) purity is high, does not introduce impurity, can not affect cell internal environment.In the present invention, the pore-size distribution of preferred described alpha-crystal form porous alumina ceramic particle is between 0.03-0.12 μm, and particle size distribution is 1 ~ 5 μm.
Wherein, described slurry by alpha-crystal form porous alumina ceramic particle and binding agent with mass ratio (93-99): (1-7) mixture; The molecular weight of described binding agent is 500,000 ~ 2,000,000.The porosity of coating is controlled by regulation and control wet end furnish processed and binding agent molecular weight.Described binding agent specifically selects PVDF, the PVDF of molecular weight 1,000,000, the PVDF of molecular weight 1,100,000 of molecular weight 900,000.
Wherein, described base material of cathode layer material can be selected from the metal as lithium ion battery negative material commonly used this area, as copper, iron etc.
Wherein, described negative electrode active material layer material is selected from carbon class material (as graphite), silicon class material or the composite material of the two.
The present invention sets up aluminium oxide micro porous coating on negative electrode active material layer surface, instead of PP, PE material barrier film that conventional lithium ion electrokinetic cell is used, not only there is higher mechanical strength, there is the problem that there is not high temperature closed pore simultaneously, resistance to elevated temperatures and the fail safe of lithium-ion-power cell can be significantly improved.
Alumina powder, by adopting paint-on technique means, is coated on negative electrode active material layer surface by the present invention, and controls the pore-size distribution of made aluminum oxide coating layer by the pore-size distribution that adjusts selected alpha-crystal form porous alumina ceramic particle, particle size distribution; Prepare the proportioning of slurry by adjustment and select the different porosity preparing coating of adjusting of binding agent molecular weight, by the thickness regulating the coating thickness in coating procedure to regulate coating, by thickness, porosity, the micropore size of above control point controlled oxidization aluminium film, thus achieve object aluminium oxide being directly overlying on negative electrode active material surface, the aluminium oxide microporous membrane of final acquisition can either substitute the function of conventional membrane completely, can further improve again fail safe and the high temperature cyclic performance of lithium ion battery.
The present invention also provides a kind of lithium ion battery, comprises positive pole, negative pole, electrolyte and three is sealed in the structural member of inside battery, and wherein, described negative pole is the above-mentioned lithium ion battery negative containing aluminium oxide micro porous coating.
Wherein, described positive plate and negative plate mutually stack and are sealed in inside battery; The each periphery of described battery cathode exceeds positive plate edge, is blocked between positive plate and negative electrode active material by the aluminium oxide micro porous coating of negative terminal surface.
Wherein, the active material in described positive pole is LiFePO4, LiMn2O4, nickle cobalt lithium manganate or cobalt acid lithium.
Adopt the lithium ion battery that lithium-ion negative pole of the present invention is obtained, there is following beneficial effect:
(1) there is the characteristic of heat-resisting quantity, can also good working condition be kept more than 180 DEG C, and the septate lithium-ion-power cell of conventional belt easily produces a large amount of heats in the process used, be easy to lose efficacy.
(2) there is the characteristic of high strength.Trimming place of conventional belt septate lithium-ion-power cell both positive and negative polarity easily produces cuts burr and pole piece exists sharp protrusion, pierces through barrier film and forms short circuit.And battery cathode of the present invention is coated with aluminium oxide micro porous coating owing to covering, there is stronger anti-acupuncture intensity, effectively can prevent the internal short-circuit of battery.
(3) there is the characteristic good to electrolyte imbibition.Because aperture is between 0.03 ~ 0.12um, there is stronger capillary force, there is good liquid-keeping property.
(4) there is powerful characteristic.Aluminium oxide can form solid solution in lithium ion battery, improves multiplying power property and cycle performance.
Accompanying drawing explanation
Fig. 1 is the structural representation of lithium ion battery negative of the present invention.
In figure: 1, base material of cathode layer; 2, negative electrode active material layer; 3, aluminium oxide micro porous coating; 4, positive electrode active material layer; 5, positive-pole base material layer.
Embodiment
Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment 1 one kinds of lithium ion battery negatives
The present embodiment provides a kind of lithium ion battery negative, and as shown in Figure 1, it is followed successively by base material of cathode layer, negative electrode active material layer, aluminium oxide micro porous coating from bottom to top.
Wherein, the thickness of described obtained aluminium oxide micro porous coating is 20 ± 1 μm.
Wherein, the micropore size of described obtained aluminium oxide micro porous coating is between 0.03-0.12 μm.
Wherein, the porosity of described obtained aluminium oxide micro porous coating is about 45%.
Wherein, described alumina material be by alpha-crystal form porous alumina ceramic granular materials and molecular weight be 1,000,000 binding agent make slurry with mass ratio 95:5 ratio mixture, and then through the negative electrode active material layer surface-coated thickness that rolling be the film of 20 μm and obtained.Described alpha-crystal form porous alumina ceramic particle selects aperture to be distributed as 0.03-0.12 μm, and particle size distribution is the alumina ceramic grain of 1 ~ 5 μm.
Wherein, described base material of cathode layer material is copper.
Wherein, described negative electrode active material layer material is graphite.
Embodiment 2 one kinds of lithium ion battery negatives
The present embodiment provides lithium ion battery negative that is a kind of and embodiment 1 structural similarity, and difference is only: the thickness of described aluminium oxide micro porous coating is 11 ± 1 μm.
Embodiment 3 one kinds of lithium ion battery negatives
The present embodiment provides lithium ion battery negative that is a kind of and embodiment 1 structural similarity, and difference is only: the thickness of described aluminium oxide micro porous coating is 29 ± 1 μm.
Embodiment 4 one kinds of lithium ion batteries
The present embodiment provides a kind of lithium ion battery, comprise positive pole, negative pole, electrolyte and three is sealed in the structural member of inside battery, the negative pole of this battery adopts the lithium ion battery negative described in embodiment 1, preparation process to comprise and positive plate and negative plate is mutually stacked and be sealed in inside battery; The each periphery of battery cathode exceeds positive plate edge 1mm, is blocked, inject the electrolyte into above inside battery between positive plate and negative electrode active material by the aluminium oxide micro porous coating of negative terminal surface.Be prepared into thickness 16mm, width 65mm with this, lithium ion battery that the aluminum enclosure of length 132mm, capacity are 10Ah.
Gained lithium ion battery is designated as A1.
Embodiment 5 one kinds of lithium ion batteries
The present embodiment provides a kind of lithium ion battery adopting embodiment 4 structural similarity, and difference is only: the lithium ion battery negative that lithium ion battery negative adopts embodiment 2 to prepare.
Gained lithium ion battery is designated as A2.
Embodiment 6 one kinds of lithium ion batteries
The present embodiment provides a kind of lithium ion battery adopting embodiment 4 structural similarity, and difference is only: the lithium ion battery negative that lithium ion battery negative adopts embodiment 3 to prepare.
Gained lithium ion battery is designated as A3.
Comparative example 1 one kinds of lithium ion battery negatives and the lithium ion battery adopting this negative pole to prepare
This comparative example provides a kind of lithium ion battery negative with embodiment 1 structural similarity and battery, and difference is only: the porosity of described aluminium oxide micro porous coating is about 35%.
Gained lithium ion battery is designated as A4.
Comparative example 2 one kinds of lithium ion battery negatives and the lithium ion battery adopting this negative pole to prepare
This comparative example provides a kind of lithium ion battery negative with embodiment 1 structural similarity and battery, and difference is only: the porosity of described aluminium oxide micro porous coating is about 55%.
Gained lithium ion battery is designated as A5.
Comparative example 3 one kinds of lithium ion battery negatives and the lithium ion battery adopting this negative pole to prepare
This comparative example provides a kind of lithium ion battery negative with embodiment 1 structural similarity and battery, and difference is only: the micropore size of described aluminium oxide micro porous coating is less than 0.03 μm.
Gained lithium ion battery is designated as A6.
Comparative example 4 one kinds of lithium ion battery negatives and the lithium ion battery adopting this negative pole to prepare
This comparative example provides a kind of lithium ion battery negative with embodiment 1 structural similarity and battery, and difference is only: the micropore size of described aluminium oxide micro porous coating is at 0.12-0.20 μm μm.
Gained lithium ion battery is designated as A7.
The septate lithium ion battery of comparative example 5 one kinds band
The septate lithium ion battery of a kind of band, comprise positive pole, negative pole, barrier film, electrolyte and be sealed in the structural member of inside battery by four, preparation process comprises positive plate and negative plate and blocks positive pole and mutually stack with the barrier film that negative pole directly contacts and be sealed in inside battery; The each periphery of battery cathode exceeds positive plate edge 1mm, and barrier film periphery exceeds negative plate 1mm.Inject the electrolyte into above inside battery.Be prepared into thickness 16mm, width 65mm with this, lithium ion battery that the aluminum enclosure of length 132mm, capacity are 10Ah.
Gained lithium ion battery is designated as A8.
Performance test
For the lithium ion battery of above-described embodiment and comparative example gained, carry out performance test, method of testing is as follows:
1, external short circuit test: lithium ion battery is adopted 1C constant current constant voltage full charging, lithium ion battery plus-negative plate is directly connected short circuit by the wire being less than 100m Ω by total resistance, lithium ion battery is not on fire, do not explode for qualified.Arrange test 10pcs, record qualified passing ratio;
2, hot case test: placed by battery in hot case and rise to 150 DEG C ± 2 DEG C with the speed of (5 DEG C ± 2 DEG C)/min and be incubated 30 minutes, lithium ion battery is not on fire, do not explode for qualified.Arrange test 10pcs, record qualified passing ratio;
3, extruding test: lithium ion battery is adopted 1C constant current constant voltage full charging, by the power of about 13KN, lithium ion battery is extruded in two planes, lithium ion battery thickness direction is squeezed to till full-sized 50%, lithium ion battery is not on fire, do not explode for qualified.Arrange test 10pcs, record qualified passing ratio;
4, cycle life of lithium ion battery appraisal procedure: above-mentioned lithium ion is changed into rear battery and carries out charge and discharge cycles with the multiplying power of 1C, the 1C discharge capacity of a certain circulation is called the capability retention after a certain circulation of lithium ion battery with the ratio of maximum discharge capacity, and circulating cycle number when capacity of lithium ion battery conservation rate is 80% is as the index weighing cycle performance.
5, lithium ion battery multiplying power discharging property assessment: above-mentioned lithium ion is changed into rear battery full with 1C constant-current constant-voltage charging, lithium ion battery is shelved 5min, different multiplying (xC) constant-current discharge is adopted to be designated as Dx to the capacity of 2.0V, lithium ion battery is full with 1C constant-current constant-voltage charging, lithium ion battery is shelved 5min, adopt 1C constant-current discharge to be designated as D0 to the capacity of 2.0V, the ratio of Dx/D0 is designated as the discharging efficiency of different multiplying.
Test result is as follows:
Table 1: security performance percent of pass contrast table
Table 2: electrical property contrast table
From above-mentioned table 1, table 2, A1-4 cycle performance is better, illustrates that its liquid-keeping property is strong; A1-4, A6 hot case test 100%, illustrates that it is high temperature resistant, and short circuit, extruding test 100%, illustrate that its intensity is high; The multiplying power discharging efficiency of A1-3, A8 is higher, illustrates that it has high rate capability.It can thus be appreciated that, adopt the obtained battery of lithium-ion negative pole of the present invention to be all better than tradition in security performance and typical case's energy and adopt barrier film lithium ion battery.Very significant by the impact of adjustment on lithium ion battery of the thickness on aluminium oxide micro porous coating, aperture, porosity, by can promote fail safe and the electrical property of lithium ion battery further to its optimization.
Although above the present invention is described in detail with a general description of the specific embodiments, on basis of the present invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, all belong to the scope of protection of present invention.
Claims (10)
1. a lithium ion battery negative, is characterized in that, comprises base material of cathode layer from bottom to top, negative electrode active material layer, aluminium oxide micro porous coating.
2. lithium ion battery negative according to claim 1, is characterized in that, the thickness of described aluminium oxide micro porous coating is between 10-30 μm.
3. lithium ion battery negative according to claim 1, is characterized in that, the micropore size of described aluminium oxide micro porous coating is between 0.03-0.12 μm.
4. lithium ion battery negative according to claim 1, is characterized in that, the porosity of described aluminium oxide micro porous coating is between 40-50%.
5. lithium ion battery negative according to claim 1, it is characterized in that, described aluminium oxide micro porous coating is that alpha-crystal form porous alumina ceramic granular materials is made slurry, so through the negative electrode active material layer surface-coated thickness that rolling be the film of 10 ~ 30 μm and obtained.
6. lithium ion battery negative according to claim 5, is characterized in that, the pore-size distribution of described alpha-crystal form porous alumina ceramic particle is between 0.03-0.12 μm, and particle size distribution is 1 ~ 5 μm.
7. lithium ion battery negative according to claim 5, is characterized in that, described slurry by alpha-crystal form porous alumina ceramic particle and binding agent with mass ratio (93-99): (1-7) mixture.
8. lithium ion battery negative according to claim 7, is characterized in that, the molecular weight of described binding agent is 500,000 ~ 2,000,000.
9. a lithium ion battery, comprises positive pole, negative pole, electrolyte and three is sealed in the structural member of inside battery, and it is characterized in that, described negative pole is the arbitrary described lithium ion battery negative containing aluminium oxide micro porous coating of claim 1-8.
10. lithium ion battery according to claim 9, is characterized in that, described positive plate and negative plate mutually stack and be sealed in inside battery; The each periphery of described battery cathode exceeds positive plate edge, is blocked between positive plate and negative electrode active material by the aluminium oxide micro porous coating of negative terminal surface.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107275670A (en) * | 2017-07-06 | 2017-10-20 | 钟旭航 | The preparation method of lithium-ion-power cell and preparation method thereof, its barrier film and barrier film, and for forming the slurry of barrier film |
| CN110993864A (en) * | 2019-11-21 | 2020-04-10 | 四川新敏雅电池科技有限公司 | Battery separator, method for manufacturing same, and lithium ion battery |
| CN111370674A (en) * | 2020-03-24 | 2020-07-03 | 江苏厚生新能源科技有限公司 | Low-expansion metal lithium negative electrode, preparation method thereof and lithium battery |
| CN114276159A (en) * | 2021-12-16 | 2022-04-05 | 惠州锂威新能源科技有限公司 | Preparation method of porous alumina ceramic and preparation method of lithium ion battery diaphragm |
| US11322736B2 (en) | 2017-06-08 | 2022-05-03 | Lg Energy Solution, Ltd. | Negative electrode, secondary battery including the same, and method of preparing the negative electrode |
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| CN102190323A (en) * | 2010-02-25 | 2011-09-21 | 住友化学株式会社 | Inorganic oxide powder, slurry containing inorganic oxide, lithium ion secondary battery having the slurry and preparation method thereof |
| CN103855350A (en) * | 2012-12-05 | 2014-06-11 | 财团法人工业技术研究院 | Lithium battery and method of forming the same |
| CN103964821A (en) * | 2013-01-28 | 2014-08-06 | 海洋王照明科技股份有限公司 | Aluminum oxide solid diaphragm, preparing method of aluminum oxide solid diaphragm, electrochemical battery or capacitor |
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Application publication date: 20151223 |