CN208460854U - The Ceramic Composite diaphragm and lithium battery of graphitiferous layer - Google Patents
The Ceramic Composite diaphragm and lithium battery of graphitiferous layer Download PDFInfo
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- CN208460854U CN208460854U CN201821141701.7U CN201821141701U CN208460854U CN 208460854 U CN208460854 U CN 208460854U CN 201821141701 U CN201821141701 U CN 201821141701U CN 208460854 U CN208460854 U CN 208460854U
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- diaphragm
- lithium battery
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- thickness
- basement membrane
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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
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Abstract
The utility model relates to a kind of Ceramic Composite diaphragm of graphitiferous layer and lithium batteries.The diaphragm includes: basement membrane；In the first and second ceramic layers of basement membrane two sides setting；With the first and second graphite linings being arranged on first and second ceramic layer.The diaphragm can have thermal stability, wetability, safety and the excellent battery charging and discharging cycle performance of raising after being assembled into lithium battery.
Description
Technical field
The utility model relates to lithium battery diaphragms, and in particular to a kind of Ceramic Composite diaphragm of graphitiferous layer and include the pottery
The lithium battery of porcelain composite diaphragm.
Background technique
Lithium ion battery is as novel high-energy chemistry power supply, under the conditions ofs high temperature or high efficiency charge and discharge etc., cell body
The fuel factor of system can cause the heat accumulation of inside battery, easily cause the burning and explosion of lithium battery.Therefore, the safety of lithium battery
Property problem is the factor of overriding concern.Meanwhile in new-energy automobile field, the demand of lithium ion battery increases year by year, large capacity
Extremely urgent with high power type battery requirements, the lithium ion battery for developing highly-safe, cycle performance/conduct electricity very well is very tight
Compel.
Utility model content
Present inventor has made intensive studies the structure of existing lithium battery and the advantage and disadvantage of component.At present mostly
Number improves diaphragm thermal stability using one layer of ceramics are coated in membrane surface, to improve lithium battery safety.But it makes in this way
The thermal stability of standby diaphragm still has limitation, shrinks under 130 DEG C or more high temperature still larger, thus high temperature resistance still needs to
Further improve.On the other hand, ceramics do not contribute the electric conductivity of the positive and negative collector of battery, and diaphragm ceramic layer is unfavorable for lithium
Lithium ion deintercalation during high-rate battery discharge, the internal resistance of cell is big and Li dendrite easy to form, reduces lithium battery cycle life.
In addition, the hardness for the cathode for being generally coated on cathode pole piece, but being prepared using graphite as negative electrode active material is larger, deposit
Be not easy coiling and molding, it is easy to fall off when by external force collision the disadvantages of.Thus, it is desirable to which further exploitation can be improved the heat of diaphragm surely
Qualitative, wetability and/or the technology of safety.
To solve the above-mentioned problems, present inventor passes through various trials, it has unexpectedly been found that, it is applied when in membrane surface
Cloth two ceramic layers, and after further increasing graphite linings, obtained diaphragm can have the heat of raising after being assembled into battery
Stability, wetability, safety and excellent battery charging and discharging cycle performance, this completes the utility model.
The utility model relates in one aspect to a kind of diaphragm comprising:
Basement membrane；
The first and second ceramic layers being arranged on two surfaces of basement membrane；With
The first and second graphite linings being arranged on the outer surface of first and second ceramic layer.
The basement membrane can be microporous barrier, perforated membrane or non-woven membrane.The microporous barrier and perforated membrane can be polyolefin
Film.
In 0.01~0.1 μ m, porosity is 20% to 80% in the aperture of the basement membrane.
The basement membrane with a thickness of 30 μm or less.
The thickness of first and second ceramic layer can be each independently 0.5~10 μm.
The thickness of first and second graphite linings can be each independently 0.1~50 μm.
The utility model another further aspect is related to a kind of lithium battery comprising above-mentioned diaphragm.
Preferably, the lithium battery include: the positive plate for being provided with positive electrode active material layer, above-mentioned diaphragm, be provided with it is negative
The negative electrode tab and electrolyte of pole active material layer.
Preferably, the positive plate be aluminium foil, 8~15 μm of thickness；The negative electrode tab be copper foil, 5~20 μm of thickness.
Beneficial effect
The utility model is by further improving thermal stability, the profit of diaphragm in membrane surface dual coating ceramic layer
Moist, safety.In addition, the utility model by ceramic layer outer surface coat graphite linings, reduce diaphragm ceramic layer with just
The interfacial resistance of negative electrode material reduces the internal resistance of cell, reduces loss amount of lithium ion during deintercalation, improve battery and fill
Discharge cycle performance.In addition, due to the conductive characteristic of graphite itself, when battery is by foreign impacts or short circuit occurs, diaphragm
On graphite linings can expand electricity tolerance range, reduce explosion or risk on fire, improve the security performance of battery.
The utility model is used in membrane surface dual coating ceramic layer, further improves diaphragm thermal stability, thus
Improve lithium battery safety.Outer ceramic surface coats graphite linings and forms composite diaphragm, and process is simple, and gained composite diaphragm is compared with cathode
Piece is softer, has many advantages, such as to avoid that graphite linings fall off and battery core is easier to form.In addition, Ceramic Composite diaphragm is negative, collector is mentioned
For bigger embedding lithium space, the storage lithium buffer area during heavy-current discharge can be used as, caused by avoiding as forming Li dendrite
Loss caused by lithium ion is irreversible.
Detailed description of the invention
Fig. 1 is the schematic diagram according to the diaphragm of one embodiment of the utility model.
Appended drawing reference:
1: basement membrane；2,3: the first and second ceramic layers；4,5: the first and second graphite linings
Specific embodiment
In the following, specific embodiment of the utility model is described in detail in conjunction with attached drawing.Comprising in the description simultaneously
The attached drawing for constituting part of specification shows embodiment of the disclosure, and with substantially retouching to the disclosure given above
State and the detailed description given below to embodiment together for explaining the principles of this disclosure.It should be understood that disclosed
Embodiment be only the disclosure example, various ways implementation can be used, therefore disclosed embodiments can be done
Various modifications out.In addition, known and/or duplicate function and structure and being not described in detail to avoid unnecessary or extra details
So that the disclosure is smudgy.Therefore, description above should not be regarded as limiting, and only as the example of embodiment, only
It is used to instruct those skilled in the art with substantially any appropriate detailed knot as the basis of claim and representative basis
Structure diversely uses the disclosure.Those skilled in the art by expect within the scope and spirit of this other modification.
As shown in Figure 1, including basement membrane 1 according to the diaphragm of the utility model embodiment, it is arranged on two surfaces of basement membrane
First and second ceramic layers 2 and 3, and the first and second graphite linings 4 and 5 being arranged on first and second ceramic layer.
The basement membrane 1 can be any basement membrane suitable for lithium battery well known in the prior art, such as it can be micro-
Pore membrane, perforated membrane or non-woven membrane.The microporous barrier and perforated membrane can be polyolefin film, for example, it can be the poly- second of single layer
Alkene (PE) or polypropylene (PP) diaphragm or polyethylene and polypropylene multi-layer composite membrane (such as polypropylene, polyethylene duplicature, gather
Propylene/polypropylene duplicature, polypropylene, polyethylene/polypropylene sandwich diaphragm etc.).The material of the non-woven membrane is without spy
It does not limit, can be used for example selected from polypropylene, polyethylene, polyimides, polyamide, polysulfones, polyacrylonitrile, polyester, fiber
Element, polyphenylene sulfide, polyacrylate, gathers to one of benzamide, poly (aryl ether sulfone ketone), aramid fiber and PSA fiber etc. polyether-ether-ketone
Or it is a variety of as material.
The aperture and porosity of the basement membrane 1 are not particularly limited, as long as its diaphragm for being suitable as lithium battery.
In general, aperture require in 0.01~0.1 μ m, such as 0.02 μm, 0.03 μm, 0.04 μm, 0.05 μm, 0.06 μm,
0.07 μm, 0.08 μm, 0.09 μm etc., when aperture is less than 0.01 μm, it is too small that lithium ion passes through ability；Aperture is greater than 0.1 μm, battery
Battery is easily short-circuit when internal dendrite generates.Between porosity general 20% to 80%, especially between 30%~50%, such as
35%, 40%, 45%, 55%, 60%, 65%, 70% etc..
The thickness of the basement membrane 1 is not particularly limited, as long as its diaphragm for being suitable as lithium battery.It is general and
Speech, with a thickness of 30 μm hereinafter, for example can be 3-20 μm or 3-16 μm, such as 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm,
11 μm, 12 μm, 13 μm, 14 μm, 15 μm etc..
Be not limited to any theory, by basement membrane 1 be arranged ceramic layer 2 and 3, can be improved diaphragm thermal stability and
Mechanical property, and diaphragm is improved for the wellability of electrolyte, so that high rate performance, cycle performance improve.
In one embodiment, the thickness of first and second ceramic layer 2 and 3 can be each independently 0.5~10 μ
M, preferably 2~5 μm, for example, the thickness of first and second ceramic layer 2 and 3 can be each independently 2 μm, 2.5 μm, 3 μ
M, 3.5 μm, 4 μm, 4.5 μm or 5 μm etc..In the case where thickness is less than 0.5 μm, it may cause contraction and change less compared with basement membrane,
It is unobvious to shrink improvement；And in the case where thickness is greater than 10 μm, may cause ceramics easily loses powder layer by layer, and diaphragm is breathed freely and increased
It is larger.
It is not limited to any theory, by the way that graphite linings 4 and 5 are arranged, is reduced between positive and negative anodes active material and ceramic film
Interfacial resistance, reduce the internal resistance of cell, reduce loss amount of lithium ion during deintercalation, improve battery charging and discharging circulation
Performance, in addition, when battery is by foreign impacts or short circuit occurs, graphite linings can expand due to the conductive characteristic of graphite itself
Electricity tolerance range reduces explosion or risk on fire, improves the security performance of battery.
In one embodiment, the thickness of first and second graphite linings 4 and 5 can be each independently 0.1~
50 μm, preferably 20~40 μm, for example, the thickness of first and second graphite linings 4 and 5 can be each independently 20 μm, 25 μ
M, 30 μm, 35 μm or 40 μm etc..In the case where thickness is less than 0.1 μm, it may not be possible to realize improvement, cause and ceramics
Film performance is no different；And in the case where thickness is greater than 50 μm, it may cause graphite linings picking, it is easy to fall off.
It can also include electrostatic spinning layer, hot closed layer, nano flame retardant layer etc. in diaphragm according to the present utility model.
The utility model another further aspect is related to a kind of lithium battery comprising above-mentioned diaphragm.
Other than above-mentioned diaphragm, the lithium battery can have the conventional structure and component of lithium battery in this field, example
It such as, further include cathode, anode, electrolyte and aluminum plastic film etc..
In one embodiment, the lithium battery include: the positive plate for being provided with positive electrode active material layer, it is above-mentioned every
Film, the negative electrode tab and electrolyte for being provided with negative electrode active material layer.
In one embodiment, the positive plate be aluminium foil, 8~15 μm of thickness, for example, 9 μm, 10 μm, 11 μm, 12 μm,
13 μm, 14 μm etc.；The negative electrode tab be copper foil, 5~20 μm of thickness, for example, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm,
13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm etc..
Claims (10)
1. a kind of diaphragm, which is characterized in that the diaphragm includes:
Basement membrane；
The first and second ceramic layers being arranged on two surfaces of basement membrane；With
The first and second graphite linings being arranged on the outer surface of first and second ceramic layer.
2. diaphragm according to claim 1, which is characterized in that the basement membrane is microporous barrier, perforated membrane or non-woven membrane.
3. diaphragm according to claim 2, which is characterized in that the microporous barrier and perforated membrane are polyolefin film.
4. diaphragm according to claim 1, which is characterized in that the aperture of the basement membrane is 0.01~0.1 μm, and porosity is
20% to 80%.
5. diaphragm according to claim 1, which is characterized in that the basement membrane with a thickness of 30 μm or less.
6. diaphragm according to claim 1, which is characterized in that the thickness of first and second ceramic layer is each independently
It is 0.5~10 μm.
7. diaphragm according to claim 1, which is characterized in that the thickness of first and second graphite linings is each independently
It is 0.1~50 μm.
8. a kind of lithium battery, which is characterized in that the lithium battery includes diaphragm described in any one of -7 according to claim 1.
9. lithium battery according to claim 8, which is characterized in that the lithium battery includes: to be provided with positive active material
The positive plate of layer, according to claim 1 diaphragm described in any one of -7, the negative electrode tab and electricity for being provided with negative electrode active material layer
Solve liquid.
10. lithium battery according to claim 9, which is characterized in that the positive plate be aluminium foil, 8~15 μm of thickness；It is described
Negative electrode tab is copper foil, 5~20 μm of thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821141701.7U CN208460854U (en) | 2018-07-18 | 2018-07-18 | The Ceramic Composite diaphragm and lithium battery of graphitiferous layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821141701.7U CN208460854U (en) | 2018-07-18 | 2018-07-18 | The Ceramic Composite diaphragm and lithium battery of graphitiferous layer |
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| Publication Number | Publication Date |
|---|---|
| CN208460854U true CN208460854U (en) | 2019-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821141701.7U Active CN208460854U (en) | 2018-07-18 | 2018-07-18 | The Ceramic Composite diaphragm and lithium battery of graphitiferous layer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963166A (en) * | 2018-07-18 | 2018-12-07 | 江苏卓高新材料科技有限公司 | The Ceramic Composite diaphragm and lithium battery of graphitiferous layer |
-
2018
- 2018-07-18 CN CN201821141701.7U patent/CN208460854U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963166A (en) * | 2018-07-18 | 2018-12-07 | 江苏卓高新材料科技有限公司 | The Ceramic Composite diaphragm and lithium battery of graphitiferous layer |
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