CN109860484A - A kind of hermetically sealed lithium ion battery of high specific property - Google Patents
A kind of hermetically sealed lithium ion battery of high specific property Download PDFInfo
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- CN109860484A CN109860484A CN201811514862.0A CN201811514862A CN109860484A CN 109860484 A CN109860484 A CN 109860484A CN 201811514862 A CN201811514862 A CN 201811514862A CN 109860484 A CN109860484 A CN 109860484A
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- lithium ion
- hermetically sealed
- ion battery
- high specific
- specific property
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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 belongs to the hermetically sealed field of lithium ion battery in space, specifically a kind of hermetically sealed lithium ion battery of high specific property.Its positive active material uses LiNi of the partial size at 5-10 μm0.8Co0.15Al0.05O2(NCA) ternary material, negative electrode active material use carbonaceous mesophase spherules graphite cathode of the partial size at 6-8 μm, and diaphragm material uses basement membrane for the ceramic diaphragm of dry method polyalkene diaphragm, and basement membrane thickness is 8-12 μm, and thickness of ceramic coating is 3-5 μm.Positive surface density is 60-80mg/m2(single side), battery specific energy 110Wh/kg, maximum continuous discharge multiplying power are 50C.The technology of the present invention substantially increases the Space Attack power supply high specific property of hermetically sealed lithium ion battery by the screening design for positive and negative pole material, the modified synergistic technology and pole piece process optimization of diaphragm.
Description
Technical field
The invention belongs to the hermetically sealed field of lithium ion battery in space, specifically a kind of hermetically sealed lithium ion battery of high specific property
Technology.
Background technique
The fields such as Space Attack require hermetically sealed lithium ion battery to have high rate capability, simultaneously as space application
Particularity, it is desirable that battery with it is high-power simultaneously, keep certain specific energy.And the high-energy-density and high power of battery are set
Meter, is two technology paths completely contradicted, how to blend the two technologies, develop the hermetically sealed lithium ion of high specific property
Battery technology is the most important thing of current Space Attack power source development.
Summary of the invention
For the problems mentioned above in the background art, the purpose of the present invention is to provide a kind of hermetically sealed lithiums of high specific property
Ion battery technology has both certain specific energy design while guaranteeing that battery high power performance plays.
To achieve the above object, the present invention provides a kind of such as the hermetically sealed lithium ion battery of high specific property, which is characterized in that just
Pole active material uses LiNi0.8Co0.15Al0.05O2(NCA) ternary material, negative electrode active material use carbonaceous mesophase spherules graphite
Cathode, diaphragm use ceramic diaphragm.
The positive active material partial size is at 5-10 μm.
The negative electrode active material partial size is at 6-8 μm.
The basement membrane of the ceramic diaphragm uses dry method polyolefin film, and for thickness at 8-12 μm, thickness of ceramic coating is 3-5 μ
m。
The anode surface density is 60-80mg/m2。
The cathode surface density is 30-50mg/m2(single side).
The battery specific energy that the present invention obtains the hermetically sealed lithium ion battery of high specific property is 110Wh/kg, maximum continuous discharge
Multiplying power is 50C.
The hermetically sealed lithium ion battery of high specific property of the present invention the preparation method comprises the following steps: by binder Kynoar
(PVDF) it is dissolved in N-Methyl pyrrolidone (NMP) and obtains binder solution；It is sequentially added in a above-mentioned mixed solution
Conductive agent and positive active material, obtain anode sizing agent；Conductive agent is sequentially added in another above-mentioned binder solution and is born
Pole active material, obtains negative electrode slurry；Anode sizing agent is coated on aluminium foil, negative electrode slurry is coated in copper foil current collector,
Baking removes solvent, and punching after roll-in respectively obtains anode pole piece and cathode pole piece；Anode pole piece and cathode pole piece are passed through folded
Sheet mode alternately superposition assembling is reloaded into aluminum hull and injects electrolyte, sealing, carries out electrochemical activation by first charge-discharge,
Hermetically sealed lithium ion battery is made.
The beneficial effects of the present invention are: the hermetically sealed lithium ion battery of high specific property provided by the invention, positive electrode are determined
The capacity for having determined battery plays, therefore selects the positive electrode of high design capacity, while the granularity by reducing material, increases material
The specific surface area for expecting particle, to improve its high rate performance.In addition, negative electrode material be the key that influence battery high rate performance because
Element, the present invention have selected the carbonaceous mesophase spherules material of little particle partial size, and the pole piece porosity of formation is high, can provide quick height
The lithium ion transport channel of effect.Diaphragm has partition positive and negative anodes contact, the effect of lithium ion is simultaneously turned on, for dry method basement membrane
Highly-breathable, the multiplying power synergy of ceramic coating and security reliability, introduce ceramic diaphragm, improve the high rate performance and peace of battery
Full reliability.The high rate performance of battery can be improved to guarantee the high porosity of pole piece using lower positive surface density.It will
Two opposite technology paths of high-energy-density and high power organically blend, and reach double high high specific property indexs, effectively solve empty
Between hermetically sealed lithium ion battery high specific property.
Detailed description of the invention
Fig. 1 is the 1C charging and discharging curve figure of the embodiment of the present invention 1 at normal temperature.
Fig. 2 is discharge curve of the embodiment of the present invention 1 under 50C multiplying power.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description.Obviously, described is only a part of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
Embodiment 1.
A kind of hermetically sealed lithium ion battery technology of high specific property, anode selection LiNi0.8Co0.15Al0.05O2(NCA) three
First material, partial size are 6 microns (D50)；Cathode selects partial size for 6 microns of carbonaceous mesophase spherules graphite material；Ceramic diaphragm
The dry method polypropylene screen that basement membrane is 12 microns, 4 microns of thickness of ceramic coating, single side coating.Positive surface density is 60mg/m2It is (single
Face).
Embodiment 2.
A kind of hermetically sealed lithium ion battery technology of high specific property, anode selection LiNi0.8Co0.15Al0.05O2(NCA) three
First material, partial size are 8 microns (D50), and cathode selects partial size for 8 microns of carbonaceous mesophase spherules graphite material.Ceramic diaphragm
The dry method polypropylene screen that basement membrane is 10 microns, 4 microns of thickness of ceramic coating, single side coating.Positive surface density is 65mg/m2It is (single
Face).
The hermetically sealed lithium ion battery technology of high specific property described in embodiment 1-2, preparation method include: first by 3%
The binder Kynoar (PVDF) of weight content is dissolved in N-Methyl pyrrolidone (NMP), sequentially adds 4% weight
The conductive agent of content and the NCA material of 93% weight content are measured, solid content 60% obtains anode sizing agent after mixing, will
Anode sizing agent is coated on the aluminium foil with a thickness of 20 microns, and corresponding surface density is made, in 80 DEG C toast 12 hours after roll-in with
And punching, obtain anode pole piece.The binder Kynoar (PVDF) of 4% weight content is dissolved in N-Methyl pyrrolidone
(NMP) in, the conductive agent of 4% weight content and the carbonaceous mesophase spherules material of 92% weight content, solid content are sequentially added
It is 50%, obtains negative electrode slurry after mixing, negative electrode slurry is coated on the copper foil with a thickness of 12 microns, is made corresponding
Surface density, roll-in and punching after toasting 12 hours in 100 DEG C, obtains cathode pole piece.Positive and negative electrode pole piece is passed through into lamination process
Alternately superposition assembling is injected electrolyte after being packed into aluminum hull and is sealed, carries out electrochemical activation by first charge-discharge, is made complete close
Seal lithium ion battery.1C and 50C multiplying power discharging, charge and discharge are carried out with hermetically sealed lithium ion battery prepared by the embodiment of the present invention 1
Curve is as depicted in figs. 1 and 2.
Specific experiment process is as follows: battery rated capacity itself is 8Ah, at normal temperature, with the current versus cell of 1C (8A)
It is constant-current constant-voltage charging, charge cutoff voltage 4.1V；With 1C (8A) electric current by battery discharge to 3V after fully charged.Again with same
Charging standard by battery it is fully charged after, with 50C (400A) constant-current discharge to 3V.From figure 1 it will be seen that the electric discharge of battery 1C is held
Amount is 8.7Ah, and specific energy calculated result is 112Wh/kg.It can be observed from fig. 2 that battery 50C electric discharge is steady, platform 3C with
On.
The above experiment shows that the present invention is designed by positive and negative anodes screening bioactive compounds, diagram modification and pole piece surface density,
Hermetically sealed lithium ion battery specific energy of the invention reaches 110Wh/kg, can realize high specific property with 50C continuous discharge.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential characteristics of the invention, the present invention can be realized in other specific forms.Therefore, nothing
By all in from the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive meaning and scope
Variation is included within the present invention.It should not treat any reference in the claims as limiting designed claim.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (6)
1. a kind of hermetically sealed lithium ion battery of high specific property, which is characterized in that the positive active material of the lithium electronics uses
LiNi0.8Co0.15Al0.05O2(NCA) ternary material, negative electrode active material use carbonaceous mesophase spherules graphite cathode, and diaphragm uses
Ceramic diaphragm.
2. the hermetically sealed lithium ion battery of high specific property as described in claim 1, which is characterized in that the positive electrode active material plasmid
Diameter is at 5-10 μm.
3. the hermetically sealed lithium ion battery of high specific property as described in claim 1, which is characterized in that the negative electrode active material plasmid
Diameter is at 6-8 μm.
4. the hermetically sealed lithium ion battery of high specific property as described in claim 1, which is characterized in that the basement membrane of the ceramic diaphragm
Using dry method polyolefin film, for thickness at 8-12 μm, thickness of ceramic coating is 3-5 μm.
5. the hermetically sealed lithium ion battery of high specific property as described in claim 1, which is characterized in that it is described anode surface density be
60-80mg/m2(single side).
6. the hermetically sealed lithium ion battery of high specific property as described in claim 1, which is characterized in that battery specific energy 110Wh/
Kg, maximum continuous discharge multiplying power are 50C.
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| CN201811514862.0A CN109860484A (en) | 2018-12-12 | 2018-12-12 | A kind of hermetically sealed lithium ion battery of high specific property |
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| CN201811514862.0A CN109860484A (en) | 2018-12-12 | 2018-12-12 | A kind of hermetically sealed lithium ion battery of high specific property |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018428A (en) * | 2020-08-27 | 2020-12-01 | 湖北亿纬动力有限公司 | Lithium ion battery and preparation method and application thereof |
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