CN104377385B - Lithium rechargeable battery composite electrolyte thin film and preparation method thereof, application - Google Patents
Lithium rechargeable battery composite electrolyte thin film and preparation method thereof, application Download PDFInfo
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- CN104377385B CN104377385B CN201410505499.1A CN201410505499A CN104377385B CN 104377385 B CN104377385 B CN 104377385B CN 201410505499 A CN201410505499 A CN 201410505499A CN 104377385 B CN104377385 B CN 104377385B
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Abstract
Present invention relates particularly to lithium rechargeable battery composite electrolyte thin film and preparation method thereof, application, wherein, the preparation method of lithium rechargeable battery composite electrolyte thin film, including: 1) particle diameter is the preparation of the inorganic electrolyte powder of 10～100nm；2) preparation of the inorganic electrolyte powder body material of surface modification；3) preparation of composite electrolyte thin film.The inventive method is by using the conducting polymer containing a small amount of lithium salts as compliant conductive skeleton, the high conductivity of the inorganic electrolyte material of mating surface silanization, the method utilizing slurry film, can prepare that a kind of ionic conductivity is high, flexible, the lithium rechargeable battery composite electrolyte thin film of easy processing.
Description
[technical field]
The present invention relates to belong to electrolytic thin-membrane preparation and application technical field, be specifically related to a kind of lithium ion two
Primary cell composite electrolyte thin film and preparation method thereof, application.
[background technology]
Lithium ion battery has had become as the main electricity of electronics market since the beginning of the nineties in last century comes out
Source, and in electronic power supply on vehicle, energy-storage system, increasingly occupy the bigger market share.In the last few years,
Along with the upgrading of electronic product and developing rapidly of new-energy automobile, high security, deformability,
The lithium ion battery of high security becomes the important development direction of following lithium ion battery.
Liquid electrolyte solution system, owing to having higher lithium ion conductivity, is traditional lithium-ion battery
Important component part, but battery is in long-time cyclic process, and liquid electrolyte is owing to existing in the dead of night, rising
The safety issue such as warm, inflammable, and become the major obstacle of high-specific energy battery system expanding application.
Use solid electrolyte diaphragm can solve the leakage of liquid electrolyte solution, the safety issue such as inflammable.Right
For inorganic solid electrolyte, P2S5-Li2S type, Li2S-SiS2Type, Li2S-GeS2-P2S5Type glass ceramics
Electrolyte has higher ionic conductivity, it has been reported that for the research of all-solid lithium-ion battery.But it is right
For the battery system of reality application, this electrolytelike electrical conductivity is the highest, and processing characteristics is poor,
Prepared all-solid-state battery chemical property also cannot meet requirement.It addition, PEO, PVDF, PMMA,
The organic polymers such as P (VDF-HFP) also can become solid polymer electrolyte with lithium salts preparation, its forming process
Mainly by forming copolymer, cross-linking compounds etc., but the ionic conductivity of full solid state polymer electrolyte
The actual demand of lithium ion battery can't be reached.As the transitional product of all solid state electrolyte, gel polymerisation
For thing electrolyte is compared to full solid state polymer electrolyte, there is the good processing characteristics of polymer, with
Time also there is of a relatively high ionic conductivity, basic research and application and development the most in this respect are all sent out
Exhibition is rapidly.In actual application, in order to the electrical conductivity and mechanical performance promoting electrolyte further often needs
Add some inorganic nano-particles.
In China's application disclosed patent application CN103515649.A, describe a kind of organic/inorganic be combined
Electrolyte preparation method, is scattered in lithium salts and modified lithium metaaluminate and goes back the poly-of aerobic ethylene repeating unit
In compound, obtain organic/inorganic composite electrolyte material, but obtained electrolytic conductivity is the most inadequate
Ideal, processing characteristics does not the most get a promotion.At China's application disclosed patent application CN101045762.A
In describe a kind of organic inorganic composite polymer electrolyte and preparation method, the method passes through emulsion polymer
Method, carries out polymethyl acrylate coating modification process, by solution polymerization process pair to nanometer titanium dioxide titanium ion
Nano-titania particle surface carries out acrylonitrile and the copolymerization of acrylonitrile methyl ester, although electrical conductivity has certain journey
The raising of degree, but these inorganic nano-particles have higher specific surface energy, are prone to reunite in cyclic process,
Thus reduce raising lithium ion conductivity and the work of stable interface that nanoparticle is played in the polymer
With.
[summary of the invention]
The technical problem to be solved in the present invention is to provide that a kind of ionic conductivity is high, flexible, the lithium of easy processing
The preparation method of ion secondary battery composite electrolyte thin film.
Above-mentioned technical problem solves by the following technical programs:
The preparation method of lithium rechargeable battery composite electrolyte thin film, including:
1), according to target product Li10-xGe1-yCex+yP2S12The metering ratio of (0.05 < x < 1,0.02 < y < 0.2)
Weigh Li2S, GeS2, P2S5And CeO2, put in the quartz tube furnace of vacuum, 300～600 DEG C of temperature
Lower sintering 3～24h, the material after sintering obtains, through ball-milling treatment, the inorganic electrolyte that particle diameter is 10～100nm
Powder, the chemical formula of inorganic electrolyte powder is Li10-xGe1-yCex+yP2S12(0.05<x<1,0.02<y<0.2)；
2), by step 1) the inorganic electrolyte powder prepared places dissolved with gamma-aminopropyl-triethoxy-silane
In dehydrated alcohol, under the conditions of 40～80 DEG C, stir 20～45h, true under the conditions of 60～80 DEG C after removing liquid by centrifugation
Empty dry 6～24h, obtain the inorganic electrolyte powder body material of surface modification；Wherein, γ-aminopropyl three ethoxy
Base silane is 1:10～80000, gamma-aminopropyl-triethoxy-silane and inorganic electrolyte with the mass ratio of dehydrated alcohol
The mass ratio of matter powder is 1:50～1000；
3), at 40～80 DEG C, Kynoar-hexafluoropropylene copolymer is dissolved in shape in dimethylformamide
The first mixed solution, Kynoar-hexafluoropropylene copolymer mass fraction in the first mixed solution is become to be
0.1～20%, it is stirring evenly and then adding into lithium salts and forms the second mixed solution, lithium salts matter in the second mixed solution
Amount mark is 0.1～20%, is stirring evenly and then adding into step 2) the prepared inorganic electrolyte powder obtaining surface modification
Body material, the inorganic electrolyte powder body material of surface modification and the quality of Kynoar-hexafluoropropylene copolymer
Ratio is 1:0.1～2, continues stirring and extremely forms uniform coating liquid, is scraped by uniform coating liquid and paint on smooth support plate
Film, is vacuum dried 4-12h under the conditions of 60～80 DEG C, obtains composite electrolyte thin film.
Also include: 4), by step 3) the composite electrolyte thin film for preparing immerses the plasticizer containing lithium salts
In 1～30min；In the plasticizer containing lithium salts, the concentration of lithium salts is not higher than 1mol/L.
Step 4) in described lithium salts be LiClO4、LiPF6、LiN(CF3SO2)2、LiBF4、LiCF3SO3
In at least one constitute, plasticizer used is ethylene carbonate (EC), Allyl carbonate (PC), formylmerphalan
Base ketopyrrolidine, sulfolane, gamma-butyrolacton, N,N-dimethylformamide, ethylene sulfite, carbonic acid fourth
At least one composition in alkene ester.
Step 3) in described lithium salts be LiBr, LiCl, LiI, LiSCN, LiClO4、LiAsF6、LiPF6、
LiBF4、LiN(SO2CF3)2、LiCF3SO3、LiC(SO2CF3)3In at least one constitute.
Step 1) described in the technological parameter of ball-milling treatment particularly as follows: rotating speed is 200～350rpm, during work
Between be 2～15h.
Step 2) described in centrifugal technological parameter particularly as follows: rotating speed is 5000～8000rpm, the working time
It is 5～10min.
Described smooth support plate uses smooth glass plate.
As seen from the above technical solution, the inventive method is by using the conducting polymer containing a small amount of lithium salts to make
For compliant conductive skeleton, the high conductivity of the inorganic electrolyte material of mating surface silanization, utilize slurry
The method of material film, can prepare a kind of ionic conductivity high (10-2～10-5Scm-1), processing flexible, easy
Lithium rechargeable battery composite electrolyte thin film.The inventive method by composite electrolyte thin film containing lithium salts
Plasticizer processes, can further improve the ionic conductivity of composite electrolyte thin film.
The present invention also provides for the lithium rechargeable battery composite electrolyte thin film prepared by said method.This lithium from
Sub-secondary cell composite electrolyte thin film, has ionic conductivity high (10-2～10-5Scm-1), flexible, easy
The advantage of processing, it is also possible to simultaneously work as the double utility of electrolyte and barrier film, simplify in lithium ion battery
Portion's structure, simplifies production technology, improves production efficiency and yields；It addition, this lithium rechargeable battery is multiple
Close electrolytic thin-membrane good with the lithium metal compatibility, compared with organic system electrolyte, generation can be prevented effectively from
The safety problem that Li dendrite pierces through barrier film and causes internal short-circuit of battery to bring.
Present invention also offers application: the lithium rechargeable battery composite electrolyte thin film prepared by said method
It is applied to lithium rechargeable battery.This application can simplify inside lithium ion cell structure, simplifies production technology,
Improve production efficiency and yields, meanwhile, also improve the safety of lithium rechargeable battery.
[detailed description of the invention]
Embodiment one
The preparation method of a kind of lithium rechargeable battery composite electrolyte thin film that the present embodiment provides, including:
1) according to target product Li9.9Ge0.9Ce0.2P2S12Metering ratio weigh Li2S, GeS2, P2S5And CeO2,
Placing in vitreosil tube furnace, material sinters at a temperature of 500 DEG C 24h, the material after sintering is through 350
The ball milling 8h process of rpm obtains Li2S-GeS2-P2S5-CeO2Inorganic electrolyte powder；
2) according to gamma-aminopropyl-triethoxy-silane: inorganic electrolyte powder: dehydrated alcohol is 5mg:1g:
The ratio of 10g, places the anhydrous second dissolved with gamma-aminopropyl-triethoxy-silane by inorganic electrolyte powder body material
In alcoholic solvent, stir 20h under the conditions of 40 DEG C, after 6000rpm high speed centrifugation 5min under the conditions of 70 DEG C
Vacuum drying 12h, obtains the inorganic electrolyte powder body material of surface modification；
3) by the conductive polymer matrix Kynoar-hexafluoropropylene copolymer of 3g technical grade at 70 DEG C
PVDF-HFP is dissolved in 34.5g dimethylformamide (DMF) and forms the first mixed solution, after stirring
Add LiCF3SO3Form the second mixed solution, LiCF3SO3Mass fraction in the second mixed solution is
5%, it is stirring evenly and then adding into the inorganic electrolyte powder body material of 10g surface modification, continues stirring to being formed all
Even coating liquid, scratches film forming by it on smooth support plate (using smooth glass plate), true under the conditions of 65 DEG C
The empty 8h that is dried i.e. can get lithium rechargeable battery composite electrolyte thin film.
This lithium rechargeable battery composite electrolyte thin film is loaded test cell, records its lithium ion conductivity
For: 7 × 10-4S/cm。
It addition, on the basis of the above-described procedure above-mentioned lithium rechargeable battery composite electrolyte thin film is done further
Process: above-mentioned lithium rechargeable battery composite electrolyte thin film is immersed containing LiBF4The propylene carbonate of lithium salts
5min in ester (PC) plasticizer；Containing LiBF4In Allyl carbonate (PC) plasticizer of lithium salts, lithium
Concentration 1mol/L of salt.The most after tested, the lithium ion conductivity of lithium rechargeable battery composite electrolyte thin film
For: 9 × 10-2S/cm。
Embodiment two
The preparation method of a kind of lithium rechargeable battery composite electrolyte thin film that the present embodiment provides, including:
1) according to target product Li9.9Ge0.9Ce0.2P2S12Metering ratio weigh Li2S, GeS2, P2S5And CeO2,
It is placed in the quartz tube furnace of evacuation, material is sintered at 500 DEG C 12h, then through ball milling
(270rpm, 3h) processes and obtains Li2S-GeS2-P2S5-CeO2Inorganic electrolyte powder；
2) according to gamma-aminopropyl-triethoxy-silane: inorganic electrolyte powder: dehydrated alcohol is 1mg:1g:
The ratio of 90g, places the anhydrous second dissolved with gamma-aminopropyl-triethoxy-silane by above-mentioned inorganic electrolyte powder
In alcoholic solvent, it is vacuum dried under the conditions of 70 DEG C after stirring 15h, 7000rpm centrifugation under the conditions of 50 DEG C
18h, obtains the inorganic electrolyte powder body material of surface modification；
3) by the conductive polymer matrix Kynoar-hexafluoropropylene copolymer of 0.8g technical grade at 70 DEG C
(PVDF-HFP) it is dissolved in the dimethylformamide (DMF) of 100g and forms the first mixed solution, stirring
1g LiAsF is added after uniformly6Material forms the second mixed solution, adds 0.8g surface modification after stirring
Inorganic electrolyte powder body material, continue stirring 5h, by it on smooth support plate (using smooth glass plate)
Blade coating film forming, is vacuum dried 8h under the conditions of 65 DEG C.
This lithium rechargeable battery composite electrolyte thin film is loaded test cell, records its lithium ion conductivity
For: 9.3 × 10-4S/cm。
It addition, on the basis of the above-described procedure above-mentioned lithium rechargeable battery composite electrolyte thin film is done further
Process: above-mentioned lithium rechargeable battery composite electrolyte thin film is immersed containing LiPF6By ethylene carbonate
(EC) 5min, LiPF and in the plasticizer that constitutes of Allyl carbonate (PC)6Concentration at plasticizer is
1mol/L, then record its lithium ion conductivity and be: 6.5 × 10-2S/cm。
Embodiment three
The preparation method of a kind of lithium rechargeable battery composite electrolyte thin film that the present embodiment provides, including:
1) according to target product Li9.7Ge0.9Ce0.4P2S12Material weighs Li2S, GeS2, P2S5And CeO2Former
Material, sinters 12h, then processes through ball milling (200rpm, 15h) and obtain at lower 400 DEG C of vacuum condition
Li2S-GeS2-P2S5-CeO2Inorganic electrolyte powder；
2) according to gamma-aminopropyl-triethoxy-silane: inorganic electrolyte powder: dehydrated alcohol is 2mg:0.5g:
The ratio of 8g, places the dehydrated alcohol dissolved with gamma-aminopropyl-triethoxy-silane by above-mentioned inorganic electrolyte powder
In solvent, stir 45h under the conditions of 40 DEG C, be vacuum dried under the conditions of 80 DEG C after 8000rpm centrifugation
24h, obtains the inorganic electrolyte powder body material of surface modification；
3) at 60 DEG C, the 0.3g PVDF-HFP purchased from traditional Chinese medicines group is dissolved in the dimethyl of 100g
Methanamide (DMF) is formed the first mixed solution, is stirring evenly and then adding into 0.5g LiC (SO2CF3)3Material shape
Become the second mixed solution, after stirring, add the inorganic electrolyte powder body material of 1g surface modification, stirring
After 3h, it is scratched film forming on smooth support plate (using smooth glass plate), vacuum under the conditions of 60 DEG C
Dry 4h i.e. can get composite electrolyte thin film.
This lithium rechargeable battery composite electrolyte thin film is loaded test cell, records its lithium ion conductivity
For: 8 × 10-4S/cm。
It addition, on the basis of the above-described procedure above-mentioned lithium rechargeable battery composite electrolyte thin film is done further
Process: above-mentioned lithium rechargeable battery composite electrolyte thin film is immersed containing LiClO4Ethylene carbonate
(PC) 30min in, LiPF6Concentration at plasticizer is 1mol/L, then records its lithium ion conductivity and be:
2.3×10-2S/cm。
The present invention is not limited to above-described embodiment, based on above-described embodiment, do not make the letter of creative work
Single replacement, it should belong to the scope that the invention discloses.
Claims (8)
1. the preparation method of lithium rechargeable battery composite electrolyte thin film, including:
1), according to target product Li10-xGe1-yCex+yP2S12Metering ratio weigh Li2S, GeS2, P2S5With
CeO2, put in the quartz tube furnace of vacuum, at a temperature of 300～600 DEG C, sinter 3～24h, after sintering
Material obtains, through ball-milling treatment, the inorganic electrolyte powder that particle diameter is 10～100nm, inorganic electrolyte powder
Chemical formula is Li10-xGe1-yCex+yP2S12, wherein, 0.05 < x < 1,0.02 < y < 0.2；
2), by step 1) the inorganic electrolyte powder prepared places dissolved with gamma-aminopropyl-triethoxy-silane
In dehydrated alcohol, under the conditions of 40～80 DEG C, stir 20～45h, true under the conditions of 60～80 DEG C after removing liquid by centrifugation
Empty dry 6～24h, obtain the inorganic electrolyte powder body material of surface modification；Wherein, γ-aminopropyl three ethoxy
Base silane is 1:2000～80000 with the mass ratio of dehydrated alcohol, and gamma-aminopropyl-triethoxy-silane is dynamo-electric with nothing
The mass ratio solving matter powder is 1:200～1000；
3), at 40～80 DEG C, Kynoar-hexafluoropropylene copolymer is dissolved in shape in dimethylformamide
The first mixed solution, Kynoar-hexafluoropropylene copolymer mass fraction in the first mixed solution is become to be
0.1～20%, it is stirring evenly and then adding into lithium salts and forms the second mixed solution, lithium salts matter in the second mixed solution
Amount mark is 0.1～20%, is stirring evenly and then adding into step 2) the prepared inorganic electrolyte powder obtaining surface modification
Body material, the inorganic electrolyte powder body material of surface modification and the quality of Kynoar-hexafluoropropylene copolymer
Ratio is 1:0.1～2, continues stirring and extremely forms uniform coating liquid, is scratched by uniform coating liquid on smooth glass plate
Film forming, is vacuum dried 4-12h under the conditions of 60～80 DEG C, obtains composite electrolyte thin film.
The preparation method of lithium rechargeable battery composite electrolyte thin film the most according to claim 1, its
It is characterised by, also includes:
4), by step 3) the composite electrolyte thin film for preparing immerses in the plasticizer containing lithium salts 1～30
min；In the plasticizer containing lithium salts, the concentration of lithium salts is not higher than 1mol/L.
The preparation method of lithium rechargeable battery composite electrolyte thin film the most according to claim 2, its
Be characterised by, step 4) in described lithium salts be LiClO4、LiPF6、LiN(CF3SO2)2、LiBF4、
LiCF3SO3In at least one constitute, plasticizer used be ethylene carbonate (EC), Allyl carbonate (PC),
N-methyl ketopyrrolidine, sulfolane, gamma-butyrolacton, N,N-dimethylformamide, ethylene sulfite, carbon
At least one composition in acid butene esters.
4. according to the lithium rechargeable battery composite electrolyte thin film described in claims 1 to 3 any one
Preparation method, it is characterised in that step 3) in described lithium salts be LiBr, LiCl, LiI, LiSCN,
LiClO4、LiAsF6、LiPF6、LiBF4、LiN(SO2CF3)2、LiCF3SO3、LiC(SO2CF3)3In
At least one is constituted.
5. according to the lithium rechargeable battery composite electrolyte thin film described in claims 1 to 3 any one
Preparation method, it is characterised in that step 1) described in the technological parameter of ball-milling treatment particularly as follows: rotating speed is
200～350rpm, the working time is 2～15h.
6. according to the lithium rechargeable battery composite electrolyte thin film described in claims 1 to 3 any one
Preparation method, it is characterised in that step 2) described in centrifugal technological parameter particularly as follows: rotating speed is
5000～8000rpm, the working time is 5～10min.
7. lithium rechargeable battery composite electrolyte thin film, it is characterised in that any by claims 1 to 3
One described preparation method is made.
8. the preparation method as described in claims 1 to 3 any one makes lithium rechargeable battery compound electric
Solve matter thin film and be applied to lithium rechargeable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410505499.1A CN104377385B (en) | 2014-09-26 | Lithium rechargeable battery composite electrolyte thin film and preparation method thereof, application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410505499.1A CN104377385B (en) | 2014-09-26 | Lithium rechargeable battery composite electrolyte thin film and preparation method thereof, application |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104377385A CN104377385A (en) | 2015-02-25 |
| CN104377385B true CN104377385B (en) | 2017-01-04 |
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Address after: 519180 Guangdong Province, Zhuhai city Doumen District Xinqing Technology Industrial Park Mount Everest Road No. nine Patentee after: Zhuhai Guanyu Battery Co.,Ltd. Address before: 519180 Guangdong Province, Zhuhai city Doumen District Xinqing Technology Industrial Park Mount Everest Road No. nine Patentee before: ZHUHAI COSLIGHT BATTERY Co.,Ltd. Address after: 519180 Guangdong Province, Zhuhai city Doumen District Xinqing Technology Industrial Park Mount Everest Road No. nine Patentee after: ZHUHAI COSLIGHT BATTERY Co.,Ltd. Address before: 519180 Guangdong Province, Zhuhai city Doumen District Xinqing Technology Industrial Park Mount Everest Road No. nine Patentee before: ZHUHAI COSLIGHT BATTERY Co.,Ltd. |