CN209613422U - Applied to the blade coating equipment for preparing perovskite battery - Google Patents
Applied to the blade coating equipment for preparing perovskite battery Download PDFInfo
- Publication number
- CN209613422U CN209613422U CN201920029024.8U CN201920029024U CN209613422U CN 209613422 U CN209613422 U CN 209613422U CN 201920029024 U CN201920029024 U CN 201920029024U CN 209613422 U CN209613422 U CN 209613422U
- Authority
- CN
- China
- Prior art keywords
- bar
- blade coating
- coating equipment
- liquid
- slit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model discloses a kind of applied to the blade coating equipment for preparing perovskite battery.Described includes bar applied to the blade coating equipment of perovskite battery is prepared, the bar includes bar ontology, the liquid storage chamber axially extended is provided in the bar ontology, the liquid storage chamber is to store feed liquid, the bar body surface is also provided with the slit axially extended simultaneously, and the liquid storage chamber is connected to slit.Blade coating equipment provided by the embodiment of the utility model, suitable for preparing the film or layer structure of large area, it can enable bar keep lasting, enough band liquid measures in long range blade coating, and it is able to maintain the uniformity of coated product, conducive to the coating for carrying out low viscosity solution on large-size substrate.
Description
Technical field
The utility model is in particular to a kind of applied to the blade coating equipment for preparing perovskite battery, belongs to perovskite thin film electricity
Pond processing technique field.
Background technique
The perovskite solar battery third generation solar cell emerging as one, since 2009, efficiency by
Year is incremented by, effective area 0.09cm2Perovskite battery efficiency already exceed 23%, raw material is extensive, cheap, preparation letter
The features such as single, has attracted numerous researchers and investor.But it to realize large area production, is still wanted gram there are many problem
Clothes.Outside the preparation quality for removing perovskite thin film, the preparation of the hole transmission layer and electron transfer layer of two sides, and need at present
The project to be optimized.Such as NiO, SnO, Cu2O, the materials such as ZnO, TiO, PCBM, C60, Spiro.
Currently, common means include hot evaporation, electron beam evaporation plating, sputtering, ALD deposition, solwution method etc..Hot evaporation, electricity
The methods of beamlet vapor deposition, sputtering are available to stablize good film, but needs high vacuum technique, and cost is not low, is not suitable for
Large area production.ALD deposition can be precisely controlled to film thickness, but too long the time required to preparation, also be not suitable for consecutive production.
And these methods are only applicable to metal and semiconductor and limited several organic matters mostly, cannot achieve for PCBM, Spiro etc.
The preparation of organic matter.
Comparatively, solwution method applicability is wider, for most semiconductor and organic matter energy successful application at liquid
Film and later period drying.And key of solwution method when preparing liquid film is exactly the thickness uniform, controllable to form a film, bubble-free and hole.It is existing
Solwution method coating method have rubbing method, czochralski method, bar knife coating, roll-to-roll transfer printing etc..Rubbing method needs special set
For to control its film-forming accuracy, the device is complicated, and required minimum solution is more, and the later period should not recycle, and there are the waste of solution, costs
It is higher.Czochralski method narrow scope of application is not suitable for partial solvent and to the dry material for having specific demand.Roll-to-roll transfer institute
It needs equipment more complex, is easy to lead to drag mark since hole occurs in drying, needs frequent manual control to adjust, and be when major part
It is applied on flexible material.
Conventional bar knife coating is to be covered with corresponding solution in substrate front drop, is then adsorbed using the microgroove in bar
Solution, and scratched forward with part solution, so that liquid film is covered on substrate surface.Existing blade coating equipment is in blade coating low viscosity
When solution, with the increase of blade coating distance, rear end thickness can be gradually thinner than front end, causes blade coating apart from limited, needs to scrape back and forth
It applies to adjust uniformity；And improve bar line-spacing merely to increase adsorbent solution amount, will lead on wet film occur it is macroscopic
Striped, this is influenced by steel wire outstanding in bar, and broader line-spacing makes two sides solution have little time naturally to flow to two sides
It is flat.The required precision of existing coating apparatus is high, limitation complicated for operation and having application.Rubbing method, czochralski method, volume pair
Volume quotes the large scale equipment that method requires custom-made, more demanding to precision etc., complicated for operation, and all has certain limitation
Property, it is not applied for all solution；And existing coating apparatus higher cost, required solution are more, and relatively easily cause solution quilt
Pollution, recycling is difficult, causes to waste.Such as a kind of coating apparatus described in Fig. 1, as a kind of flexible printing equipment, 1. 2.
It is 8. bar for die head, is 4. barrier blocks, is 5. the solution in die head.Working principle are as follows: solution 5. die head 1. 2. in stream
It moves, and flows through the region 1. 2. 8. 4. to fence up, is i.e. the top of barrier blocks 4., the lower section of bar 8..8. bar is driven by a motor
Rotation is transferred in the substrate of top using the Characteristic Adsorption solution of bar, and by solution.Its substrate substrate during the work time
It faces down, is coated with from bottom to top, additional other equipment component carries out solution for giving recycling；Coating method is that substrate continuously moves
Dynamic, bar rotation transfers solution thereon；It is primarily adapted for use in that liquid film is relatively thin, has the solution of certain viscosity, is not suitable in glass
Etc. be coated in planar substrates, be not suitable for being coated with from top to bottom.
Utility model content
The main purpose of the utility model is to provide a kind of applied to the blade coating equipment for preparing perovskite battery and preparation
The method of film can be used for preparing perovskite battery hole and the electronic shell of large area, and then overcome the deficiencies in the prior art.
For the aforementioned purpose of utility model of realization, the technical solution adopted in the utility model includes:
The utility model embodiment provides a kind of applied to the blade coating equipment for preparing perovskite battery comprising bar,
The bar includes bar ontology, the liquid storage chamber axially extended is provided in the bar ontology, the liquid storage chamber is to deposit
Storing liquid, while the bar body surface is also provided with the slit axially extended, the liquid storage chamber is connected to slit.
Further, the inlet and liquid return hole being connected to the liquid storage chamber, the inlet are additionally provided in the bar
It is connected to liquid feed device.
Further, the bar further includes two connection conversion heads for being connected to bar ontology both ends,
It is provided with the inlet on one of connection conversion head, is provided with the liquid return hole on another connection conversion head.
Further, the width of the slit is 0.02-2mm.
Further, the linear slit is with respect to the horizontal plane obliquely installed upwards.
Preferably, the angle between the inner wall and horizontal plane of the linear slit is greater than 0 ° less than 180 °.
Further, the coil of multiple protrusions, the coil encircling bar sheet is also distributed in the bar body surface
External week setting, and the distance between adjacent windings are 5-100 μm.
Further, the bar ontology is cylindrical structure.
Further, the diameter of the bar ontology is 10-30mm.
Further, the diameter of the liquid storage chamber is 3-20mm.
The utility model embodiment additionally provides a kind of method for preparing perovskite battery cavitation layer or electronic shell, packet
It includes:
A bar is provided, the bar includes bar ontology, is provided with the liquid storage axially extended in the bar ontology
Chamber, the liquid storage chamber is to store feed liquid, while the bar body surface is also provided with the slit axially extended, the storage
Sap cavity is connected to slit；
It is horizontally disposed to make the bar, and is obliquely installed the slit with respect to the horizontal plane upwards；
Feed liquid is injected into the liquid storage chamber, until feed liquid will be overflowed from slit, then adjust the position of the bar, is made
The bar and substrate cooperate, and complete to scratch preposition work；
Continue to inject feed liquid into the liquid storage chamber, and relatively moves the bar and substrate, while making from described narrow
The feed liquid overflowed in seam is scratched to substrate surface by the bar and forms continuous liquid film, and the liquid film can the company of being formed after hardening
Continuous film
Further, the angle of the inner wall of the slit and horizontal plane is greater than 0 ° less than 180 °.
Preferably, the slit is located at the surface of the bar axis.
Further, the feed liquid is the precursor solution to form perovskite battery cavitation layer or electronic shell, described
Substrate includes perovskite thin film, and the film that the liquid film is formed after hardening is the cavitation layer or electronic shell of perovskite battery.
Further, the film with a thickness of 20-1000nm, the uniformity is within ± 20%.
Compared with prior art, blade coating equipment provided by the embodiment of the utility model, structure is simple, easy to operate, is applicable in
In the film or layer structure of preparation large area, bar can be enable to keep lasting, enough band liquid in long range blade coating
Amount, and it is able to maintain the uniformity of coated product, conducive to the coating of low viscosity solution is carried out on large-size substrate, and it is fed
Total liquid measure needed for mechanism is few, and can recycle, save the cost.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of coating apparatus in the prior art；
Fig. 2 is a kind of structural schematic diagram of bar ontology in the utility model embodiment 1；
Fig. 3 is a kind of the schematic diagram of the section structure of bar ontology in the utility model embodiment 1；
Fig. 4 is a kind of partial structural diagram of bar ontology in the utility model embodiment 1；
Fig. 5 is a kind of partial profile structure of bar ontology in the utility model embodiment 1.
Specific embodiment
In view of deficiency in the prior art, this case utility model people is studied for a long period of time and is largely practiced, and is able to propose this reality
With novel technical solution.The technical solution, its implementation process and principle etc. will be further explained as follows.
The utility model embodiment provides a kind of applied to the blade coating equipment for preparing perovskite battery comprising bar,
The bar includes bar ontology, the liquid storage chamber axially extended is provided in the bar ontology, the liquid storage chamber is to deposit
Storing liquid, while the bar body surface is also provided with the slit axially extended, the liquid storage chamber is connected to slit.
Further, the inlet and liquid return hole being connected to the liquid storage chamber, the inlet are additionally provided in the bar
It is connected to liquid feed device.
Further, the bar further includes two connection conversion heads for being connected to bar ontology both ends,
It is provided with the inlet on one of connection conversion head, is provided with the liquid return hole on another connection conversion head.
Further, the width of the slit is 0.02-2mm.
Further, the linear slit is with respect to the horizontal plane obliquely installed upwards.
Preferably, the angle between the inner wall and horizontal plane of the linear slit is greater than 0 ° less than 180 °.
Further, the coil of multiple protrusions, the coil encircling bar sheet is also distributed in the bar body surface
External week setting, and the distance between adjacent windings are 5-100 μm.
Further, the bar ontology is cylindrical structure.
Further, the diameter of the bar ontology is 10-30mm.
Further, the diameter of the liquid storage chamber is 3-20mm.
The utility model embodiment additionally provides a kind of method for preparing perovskite battery cavitation layer or electronic shell, packet
It includes:
A bar is provided, the bar includes bar ontology, is provided with the liquid storage axially extended in the bar ontology
Chamber, the liquid storage chamber is to store feed liquid, while the bar body surface is also provided with the slit axially extended, the storage
Sap cavity is connected to slit；
It is horizontally disposed to make the bar, and is obliquely installed the slit with respect to the horizontal plane upwards；
Feed liquid is injected into the liquid storage chamber, until feed liquid will be overflowed from slit, then adjust the position of the bar, is made
The bar and substrate cooperate, and complete to scratch preposition work；
Continue to inject feed liquid into the liquid storage chamber, and relatively moves the bar and substrate, while making from described narrow
The feed liquid overflowed in seam is scratched to substrate surface by the bar and forms continuous liquid film, and the liquid film can the company of being formed after hardening
Continuous film
Further, the angle of the inner wall of the slit and horizontal plane is greater than 0 ° less than 180 °.
Preferably, the slit is located at the surface of the bar axis.
Further, the feed liquid is the precursor solution to form perovskite battery cavitation layer or electronic shell, described
Substrate includes perovskite thin film, and the film that the liquid film is formed after hardening is the cavitation layer or electronic shell of perovskite battery.
Further, the film with a thickness of 20-1000nm, the uniformity is within ± 20%.
It as follows will be further to works such as the technical solution, its implementation process and principles in conjunction with attached drawing and specific embodiment
It illustrates.
Embodiment 1
It is a kind of to be wrapped applied to the blade coating equipment for preparing perovskite battery mainly for the film forming feed liquid use of low concentration
It includes bar, the liquid feed device connecting with bar and can also include mounting bracket and driving mechanism (such as driving motor or drive
Take offence cylinder etc.), bar may be mounted in mounting bracket, and driving mechanism and mounting bracket or bar are sequentially connected, and at least make
Bar is moved along direction initialization and setting track；Wherein the specific constructive form of mounting bracket can be arranged as the case may be.
Fig. 2-Fig. 5 is please referred to, the bar includes bar ontology 101, is provided in bar ontology 101 axially extending along its
Liquid storage chamber 102, liquid storage chamber 102 to store feed liquid, while 101 surface of bar ontology be also provided with it is axially extending narrow along its
Seam 103, liquid storage chamber 102 is connected to slit 103；The coil of multiple protrusions, coil loop coiling is also distributed in 101 surface of bar ontology
The setting of stick body peripheral, and guide groove is formed between adjacent windings, guide groove is able to enter by the feed liquid overflowed in slit
In, and conveyed along guide groove, the distance between adjacent windings (i.e. the width of guide groove) are 5-100 μm, multiple protrusions
Coil can be wholely set, and can be wound around bar body surface in the shape of a spiral.It is separately connected at the both ends of bar ontology 101
It by connection conversion head 201,301, connects and is provided with inlet on conversion head 201, connect and be provided with liquid return hole on conversion head 301,
Connection conversion head 201 is connect through a connector 202 with liquid feed device, and then is connected to inlet with liquid feed device, connection conversion
First 301 connect through a connector or directly with liquid feed device, and then are connected to liquid return hole with liquid feed device；Wherein connect conversion head
201 can be set switch with connection conversion head 301, and connection conversion head 201,301 can be made to be in via switch and play on or off
Closed state.
Wherein, slit 103 is with respect to the horizontal plane obliquely installed upwards, and the inner wall of slit 103 and the angle of horizontal plane are greater than
0 ° and less than 180 °；Specifically, bar ontology 101 can be cylindrical structure, a diameter of 10-30mm, liquid storage chamber 102 it is straight
Diameter is 3-20mm, and the width of slit 103 is 0.02-2mm.
A method of perovskite battery cavitation layer or electronic shell are prepared, may include:
1) bar is provided, the bar includes bar ontology 101, is provided in the bar ontology 101 and prolongs along axial direction
The liquid storage chamber 102 stretched, liquid storage chamber is to store feed liquid, while bar body surface is also provided with the slit 103 axially extended,
Liquid storage chamber is connected to slit, and, the coil of multiple protrusions, coil encircling bar sheet is also distributed on 101 surface of bar ontology
External week setting, and guide groove is formed between adjacent windings, the distance between adjacent windings (i.e. the width of guide groove) are
5-100 μm, connection conversion head is respectively set at the both ends of bar, and respectively as inlet and liquid return hole, and make inlet and
Liquid return hole is connected to liquid feed device respectively；
2) make bar horizontally disposed, and be obliquely installed slit 103 with respect to the horizontal plane upwards, the inner wall of slit 103 with
The angle of horizontal plane is 0-180 °, such as the surface that slit can be made to be located at linear slit axis, that is, stitches 103 inner wall and horizontal plane
Angle be 90 °；
3) liquid return hole is closed, injects feed liquid into the liquid storage chamber 102 using tools such as peristaltic pumps, until feed liquid will be from
It is overflowed in slit 103, then adjusts the position of the bar, cooperate the bar and substrate, complete to scratch preposition work；
4) continue to inject feed liquid into the liquid storage chamber 102, and move the bar according to certain speed is opposite with substrate
It is dynamic, while scratch the feed liquid overflowed from the slit to substrate surface by the bar and forming continuous liquid film, the liquid
Film can form continuous film after hardening.
Specifically, the feed liquid is the precursor solution to form perovskite battery cavitation layer or electronic shell, the base
Material includes perovskite thin film, and the film that the liquid film is formed after hardening is the cavitation layer or electronic shell of perovskite battery；It is formed
Film with a thickness of 20-1000nm, the uniformity is within ± 20%.
It should be noted that blade coating equipment provided by the embodiment of the utility model is in addition to can be adapted for preparing perovskite too
Except structure in positive energy battery, it can be also used for preparing such as conductive film, Ag nanometer various membrane structures, can match according to demand
It is set to the feed liquid of low viscosity.The bar ontology of the blade coating equipment provided in the utility model and the material of coil can use ability
The metal materials such as domain common material, such as steel, length can be adjusted as needed；The structure of mounting rack therein can be with
It is arranged as the case may be, liquid feed device may include container, passage and the peristaltic pump etc. for holding material, and feed liquid is driven by pump,
It completes to convey through passage, details are not described herein for structure, the connection conversion head and connector in connection switching mechanism therein
Structure and material can use structure and material known to those skilled in the art, commercially available acquisition can be passed through.
Blade coating equipment provided by the embodiment of the utility model, the coating being suitble in the planar substrates such as glass can also be suitble to
Roll-to-roll flexible parent metal can be coated with from top to bottom；And it is suitble to the feed liquid of various viscosity, in particular low viscosity feed liquid, to liquid
Film thickness does not have particular/special requirement；The utility model compares for other technologies compared with the prior art, reduces other complicated groups
Part reduces the requirement to space, cost, maintenance etc. convenient for being integrated in various kinds of equipment；And the scope of application is wider, to material
Liquid and substrate are without particular/special requirement；Structure is simple, cheap, it is easier to arrange in pairs or groups into various kinds of equipment system, equipment is facilitated to change
It makes；And there is liquid-supplying system, it can long range even spread；It is easy to operate, it takes conveniently, required solution is few, and recycling solution is simpler
It is single.
Compared with prior art, blade coating equipment provided by the embodiment of the utility model, suitable for preparing the film of large area
Or layer structure, bar can be enable to keep lasting, enough band liquid measures in long range blade coating, and be able to maintain coating and produce
The uniformity of product, conducive to the coating for carrying out low viscosity solution on large-size substrate, and total liquid measure needed for feeding machanism is few, and
It can recycle, save the cost.
It should be appreciated that above-described embodiment is only to illustrate the technical ideas and features of the present invention, it is ripe its object is to allow
The personage for knowing technique can understand the content of the utility model and implement accordingly, can not limit the utility model with this
Protection scope.All equivalent change or modifications according to made by the spirit of the present invention essence, should all cover in the utility model
Within protection scope.
Claims (11)
1. a kind of applied to the blade coating equipment for preparing perovskite battery, it is characterised in that including bar, the bar includes bar
Ontology is provided with the liquid storage chamber axially extended in the bar ontology, and the liquid storage chamber is to store feed liquid, while the line
Stick body surface is also provided with the slit axially extended, and the liquid storage chamber is connected to slit.
2. blade coating equipment according to claim 1, it is characterised in that: be additionally provided in the bar and be connected to the liquid storage chamber
Inlet and liquid return hole, the inlet is connected to liquid feed device.
3. blade coating equipment according to claim 2, it is characterised in that: the bar further includes being connected to the bar
Two connection conversion heads at ontology both ends, one of connect are provided with the inlet on conversion head, another connection conversion
The liquid return hole is provided on head.
4. blade coating equipment according to claim 1, it is characterised in that: the width of the slit is 0.02-2mm.
5. blade coating equipment according to claim 1 or 4, it is characterised in that: the slit with respect to the horizontal plane tilts upwards
Setting.
6. blade coating equipment according to claim 5, it is characterised in that: the angle between the inner wall and horizontal plane of the slit
Greater than 0 ° less than 180 °.
7. blade coating equipment according to claim 1, it is characterised in that: multiple protrusions are also distributed in the bar body surface
Coil, the described coil encircling bar body peripheral setting.
8. blade coating equipment according to claim 7, it is characterised in that: the distance between adjacent windings are 5-100 μm.
9. blade coating equipment according to claim 1, it is characterised in that: the bar ontology is cylindrical structure.
10. blade coating equipment according to claim 9, it is characterised in that: the diameter of the bar ontology is 10-30mm.
11. blade coating equipment according to claim 9, it is characterised in that: the diameter of the liquid storage chamber is 3-20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920029024.8U CN209613422U (en) | 2019-01-08 | 2019-01-08 | Applied to the blade coating equipment for preparing perovskite battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920029024.8U CN209613422U (en) | 2019-01-08 | 2019-01-08 | Applied to the blade coating equipment for preparing perovskite battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209613422U true CN209613422U (en) | 2019-11-12 |
Family
ID=68449120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920029024.8U Active CN209613422U (en) | 2019-01-08 | 2019-01-08 | Applied to the blade coating equipment for preparing perovskite battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209613422U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109395980A (en) * | 2019-01-08 | 2019-03-01 | 苏州协鑫纳米科技有限公司 | Applied to preparing the blade coating equipment of perovskite battery and prepare the method for film |
-
2019
- 2019-01-08 CN CN201920029024.8U patent/CN209613422U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109395980A (en) * | 2019-01-08 | 2019-03-01 | 苏州协鑫纳米科技有限公司 | Applied to preparing the blade coating equipment of perovskite battery and prepare the method for film |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109395980A (en) | Applied to preparing the blade coating equipment of perovskite battery and prepare the method for film | |
| KR101328859B1 (en) | Brush Coating System for Transparent Ag Nanowire Electrodes | |
| CN205966362U (en) | Nick transfer coating head | |
| CN202762593U (en) | Coating machine for drawing film | |
| CN103590121B (en) | A kind of linear jet flow is without spray nozzle type electrostatic spinning apparatus | |
| CN209613422U (en) | Applied to the blade coating equipment for preparing perovskite battery | |
| CN210700780U (en) | Inorganic porcelain aluminum plate's spraying device | |
| CN103255485A (en) | Tip-end type needle-free electrostatic spinning equipment | |
| CN109961881A (en) | Slot coated formula graphene transparent conductive film substrate functional layer setting method | |
| CN112397252A (en) | Method and system for manufacturing flexible transparent conductive film with embedded metal material | |
| CN111516398B (en) | Advertisement ink-jet drawing machine | |
| CN109961904A (en) | Blade coating formula graphene transparent conductive film substrate functional layer setting method | |
| KR20120037870A (en) | Silver thin-film spread apparatus by means of deposition of nano metallic silver | |
| CN106587041A (en) | Film preparation device and preparation method based on ink-jet printing | |
| CN109961877A (en) | Plasma spraying formula graphene transparent conductive film substrate preprocess method | |
| CN108133788A (en) | A kind of continuous preparation method of roll-to-roll graphene transparent conductive film | |
| CN109961903A (en) | Light pulse fusing type grapheme material layer setting method | |
| CN109961880A (en) | Dimple roller differential cloth of coating-type graphene transparent conductive film substrate functional layer setting method | |
| CN109961878A (en) | Quantitative feeding transfer coated formula graphene transparent conductive film substrate functional layer setting method | |
| CN220239108U (en) | Slit coating device | |
| CN215612718U (en) | Anode rod production is with fashioned auxiliary assembly that can coat fast | |
| CN109954644A (en) | Room temperature plasma fusing type grapheme material layer setting method | |
| CN219702495U (en) | Dispensing head of online dispensing machine | |
| CN219400701U (en) | Coating machine for lithium battery production | |
| CN218340127U (en) | Novel evenly spray paint device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200226 Address after: 215300, No. 199, Feng Feng Road, Yushan Town, Kunshan, Jiangsu, Suzhou Patentee after: Kunshan GCL photoelectric materials Co., Ltd Address before: 215000 1-3 floors of N3 Building, 88 Dongchang Road, Suzhou Industrial Park, Suzhou City, Jiangsu Province Co-patentee before: Suzhou GCL Energy Technology Development Co Ltd Patentee before: Suzhou Xiexin Nano Technology Co. Ltd. |