CN209730033U - A kind of functionality composite diaphragm - Google Patents
A kind of functionality composite diaphragm Download PDFInfo
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- CN209730033U CN209730033U CN201920593724.XU CN201920593724U CN209730033U CN 209730033 U CN209730033 U CN 209730033U CN 201920593724 U CN201920593724 U CN 201920593724U CN 209730033 U CN209730033 U CN 209730033U
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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 utility model patent discloses a kind of functional composite diaphragm for secondary cell.The composite diaphragm is made of the polyalkene diaphragm, inorganic oxide coating, conductive coating of business.Compared with single polyalkene diaphragm, not only the thermal stability of diaphragm can be improved in the inorganic oxide coating in modified diaphragm, it prevents diaphragm from melting because of high temperature deformation and causes short circuit, and conductive coating can promote the electronics transfer at interface, reduce the big side effect of inorganic matter coating bring load transfer resistance, obtains while having the functional composite diaphragm of high security, lower bound surface charge transfer impedance.
Description
Technical field
The utility model relates to field of batteries, particularly relate to lithium ion battery, lithium-sulfur cell, lithium metal-ion-conductance
The fields such as pond, sode cell.It is that one kind is used for such field of batteries, can prevent diaphragm from melting initiation short circuit at high temperature and mention
The functional composite diaphragm of high electrode interface charge transmittability.
Background technique
Lithium ion battery has many advantages, such as that energy density is high, small in size, light weight, has been widely used in various portable
Formula and large-scale electronic and electrical equipment.
Diaphragm is one of big critical material of lithium ion battery four, usually a kind of porous polymeric film material, have compared with
Good ion transport capability and electronic isolation, setting prevent positive and negative anodes from directly contacting between positive and negative anodes and cause short circuit.Diaphragm
The quality of performance directly affects the performances such as battery capacity, circulation and safety, researches and develops high performance diaphragm for the further of battery
Extensive use has very important significance.
Currently used diaphragm is mainly polyalkene diaphragm, mainly there is polypropylene, polyethylene, non-woven fabrics etc.
(CN102064299A, CN103887464A).But since its fusing point is lower, when battery improper in use, temperature is more than
150oC causes diaphragm to melt, to cause positive and negative anodes short-circuit, generates serious safety accident.For this purpose, being coated in membrane surface
One layer of ceramic layer, such as aluminium oxide, silica, zirconium oxide improve the thermal stability of diaphragm, but these inorganic oxides are general
All over all conductive bad disadvantage, lead to the problem that composite diaphragm interface impedance is big or interface charge transmittability is weak.
Utility model content
In order to solve the problems, such as that charge transport ability existing for modified diaphragm ceramic layer is weak, the utility model, routine every
After film is coated with one layer of inorganic oxide, one layer of conductive coating is coated to improve the height generated by inorganic oxide conductive difference
Interface impedance, to obtain a kind of not only with good safety but also compound with the strong functionality of interface charge transmittability
Diaphragm.
The technical solution that the utility model is taken are as follows: a kind of functionality composite diaphragm, by business polyalkene diaphragm, non-woven fabrics
As base layer, the inorganic oxide layer of the outer single side of base layer or double spread even compact, then in the inorganic oxide
The conductive particle outer layer of layer outside one layer of even compact of single side or double spread again.
A kind of functional composite diaphragm of the utility model, base layer business polyalkene diaphragm have uniform pore structure,
Porosity is 10-60%, aperture 0.01-1mm, with a thickness of 1-25mm.
A kind of functional composite diaphragm of the utility model, base layer business polyalkene diaphragm have uniform pore structure,
Porosity is 30-50%, aperture 0.1-0.3mm, with a thickness of 5-20mm.
A kind of functional composite diaphragm of the utility model, inorganic oxide layer is alumina material, the alumina particle
For 1nm-1mm, aluminum oxide coating layer with a thickness of 0.1mm-10mm.
A kind of functional composite diaphragm of the utility model, the alumina particle is 50nm-300nm, aluminum oxide coating layer
With a thickness of 0.5-4mm.
A kind of functional composite diaphragm of the utility model, conductive material used in conductive particle outer layer is multi-walled carbon nanotube,
Aperture is 10-100nm, and length 1-20mm, multi-walled carbon nanotube coating layer thickness is 2-15mm.
A kind of functional composite diaphragm of the utility model, multi-walled carbon nanotube aperture are 20-50nm, length 5-10mm,
Multi-walled carbon nanotube coating layer thickness is 5-10mm.
A kind of functional composite diaphragm of the utility model, the battery modified diaphragm can be used for lithium ion battery, lithium-sulphur electricity
Pond, metal lithium-ion battery, sode cell.
What the utility model obtained has the beneficial effect that
Inorganic oxide coating can effectively improve the thermal stability of diaphragm, prevent diaphragm from occurring because of high temperature melt short
Road, conductive coating can effectively reduce the large interface impedance generated by inorganic oxide coating poorly conductive, effectively facilitate electricity
The transmission of pole interface charge, i.e., while improving diaphragm high temperature safe performance, also ensure the chemical property of battery.
Detailed description of the invention
Fig. 1 is the product schematic diagram of composite diaphragm disclosed by the utility model.
Fig. 2 is measured after different diaphragm assembling half-cells in the utility model embodiment 1, comparative example 1-1 and comparative example 1-2
AC impedance figure.
Specific embodiment
In conjunction with diagram, a kind of specific embodiment of functional composite diaphragm is described below.
As shown in Figure 1, the utility model composite diaphragm is multilayered structure, supporting layer 1 is commercialization polypropylene diaphragm, modification
Layer 2 is inorganic oxide coating, and decorative layer 3 is conductive coating, and some specific embodiments for preparing composite diaphragm are explained below.
Embodiment 1
Matrix diaphragm uses single-layer polypropylene seperation film, porosity 50%, aperture 0.1mm, with a thickness of 20 mm.It is used
Aluminium oxide partial size be 100nm, be coated in the single side of diaphragm, coating thickness 2.5mm, used multi-wall carbon nano-tube
Pore diameter is 30nm, length 7-10mm, carries out one side coating on the basis of aluminum oxide coating layer, coating with a thickness of 8mm.Most
The composite diaphragm that single side is successively coated with multi-walled carbon nanotube, aluminium oxide is obtained afterwards.Then compound by what is obtained in accordance with the following methods
Diaphragm is assembled into half-cell and carries out load transfer testing impedance.
Diaphragm load transfer testing impedance
Test method: AC impedence method
Test equipment: occasion China electrochemical workstation 760e
Test process: battery testing, just extremely commercialized LiFePO4 are carried out using 2025 button cells, diaphragm is real
The product in example 1 is applied, cathode is lithium piece, and electrolyte is LB315 type ternary electrolyte, it is sequentially placed into button cell, coating
Opposite LiFePO4 on one side, is then assembled into half-cell, stands 8 hours, carries out ac impedance measurement, and the frequency separation of test is
10-1-105Hz, amplitude 5mV, three groups of same type of battery testing are averaged, and data summarization is in table 1.
Comparative example 1-1
The commercialization polypropylene diaphragm of any modification 1-1 as a comparison case will not be carried out.
Comparative example 1-2
By the modified diaphragm of one side coating nano aluminium oxide 1-2 as a comparison case.Matrix diaphragm using single-layer polypropylene every
Film, porosity 50%, aperture 0.1mm, with a thickness of 20 mm.The partial size of used aluminium oxide is 100nm, and coating thickness is
2.5mm is coated in diaphragm single side.By comparative example 1-1 and comparative example 1-2 septation respectively according to being tested in embodiment 1
Cheng Jinhang load transfer testing impedance, test result is summarized in table 1.
Embodiment 2
Matrix diaphragm uses monolayer polyethylene diaphragm, porosity 50%, and aperture 0.3mm is used with a thickness of 15mm
The partial size of aluminium oxide be 200nm, two-sided in diaphragm be respectively coated, and the coating thickness in each face is 2mm, used more
Wall carbon nano tube aperture is 20nm, length 10-12mm, is respectively coated on the basis of the two-sided aluminum oxide coating layer of diaphragm, often
The thickness of a face coating is all 5mm.Finally obtain the two-sided composite diaphragm for being successively coated with multi-walled carbon nanotube, aluminium oxide.
Composite diaphragm obtained in embodiment 2 is subjected to load transfer testing impedance according to test process in embodiment 1, will be tested
As a result it is summarized in table 1.
Embodiment 3
Matrix diaphragm use nonwoven cloth diaphragm, porosity 60%, aperture 0.2mm, with a thickness of 22mm, used oxygen
The partial size for changing aluminium is 500nm, and two-sided in diaphragm is respectively coated, and the coating thickness in each face is 3mm, used multi wall carbon
Nanotube aperture is 40nm, length 2-6mm, is respectively coated on the basis of the two-sided aluminum oxide coating layer of diaphragm, and each face applies
The thickness of cloth is all 6mm.Finally obtain the two-sided composite diaphragm for being successively coated with multi-walled carbon nanotube, aluminium oxide.
Composite diaphragm obtained in embodiment 3 is subjected to load transfer testing impedance according to test process in embodiment 1 respectively, it will
Test result is summarized in table 1.
Table 1 is different diaphragm test gained load transfer impedance data summary sheets in the utility model embodiment and comparative example.
The different diaphragm test gained load transfer impedance data summary sheets of table 1
According to fig. 2 with table 1 the results show that after commercialized polypropylene diaphragm is coated with nano aluminium oxide, load transfer
Impedance significantly increases, and after nano oxidized aluminium outer layer is coated with one layer of multi-walled carbon nanotube conductive layer again, interface impedance is obvious
Reduce, i.e., after comprehensive the two, the utility model obtains a kind of while having high safety performance and lower bound surface charge under high temperature
The functional composite diaphragm of transfer impedance.
Claims (8)
1. a kind of functionality composite diaphragm, which is characterized in that by business polyalkene diaphragm, non-woven fabrics as base layer, base layer
Outer single side perhaps double spread even compact inorganic oxide layer then outside the inorganic oxide layer again single side or
The conductive particle outer layer of one layer of even compact of double spread.
2. functionality composite diaphragm according to claim 1, which is characterized in that base layer business polyalkene diaphragm has equal
Even pore structure, porosity 10-60%, aperture 0.01-1mm, with a thickness of 1-25mm.
3. functionality composite diaphragm according to claim 2, which is characterized in that base layer business polyalkene diaphragm has equal
Even pore structure, porosity 30-50%, aperture 0.1-0.3mm, with a thickness of 5-20mm.
4. functionality composite diaphragm according to claim 1, which is characterized in that inorganic oxide layer is alumina material,
The alumina particle be 1nm-1mm, aluminum oxide coating layer with a thickness of 0.1mm-10mm.
5. functionality composite diaphragm according to claim 4, which is characterized in that the alumina particle is 50nm-
300nm, aluminum oxide coating layer with a thickness of 0.5-4mm.
6. functionality composite diaphragm according to claim 1, which is characterized in that conductive material used in conductive particle outer layer is
Multi-walled carbon nanotube, aperture 10-100nm, length 1-20mm, multi-walled carbon nanotube coating layer thickness are 2-15mm.
7. functionality composite diaphragm according to claim 6, which is characterized in that multi-walled carbon nanotube aperture is 20-50nm,
Length is 5-10mm, and multi-walled carbon nanotube coating layer thickness is 5-10mm.
8. functionality composite diaphragm according to claim 1, it is characterised in that the functionality composite diaphragm can be used for lithium
Ion battery, lithium-sulfur cell, sode cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920593724.XU CN209730033U (en) | 2019-04-28 | 2019-04-28 | A kind of functionality composite diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920593724.XU CN209730033U (en) | 2019-04-28 | 2019-04-28 | A kind of functionality composite diaphragm |
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| CN209730033U true CN209730033U (en) | 2019-12-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110970588A (en) * | 2019-12-18 | 2020-04-07 | 江苏厚生新能源科技有限公司 | Coating diaphragm for sodium ion battery, preparation method of coating diaphragm and sodium ion battery |
| CN115458868A (en) * | 2022-10-26 | 2022-12-09 | 浙江大象新能源科技有限公司 | Composite diaphragm, preparation method and lithium battery |
-
2019
- 2019-04-28 CN CN201920593724.XU patent/CN209730033U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110970588A (en) * | 2019-12-18 | 2020-04-07 | 江苏厚生新能源科技有限公司 | Coating diaphragm for sodium ion battery, preparation method of coating diaphragm and sodium ion battery |
| CN115458868A (en) * | 2022-10-26 | 2022-12-09 | 浙江大象新能源科技有限公司 | Composite diaphragm, preparation method and lithium battery |
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