CN118326706A - Preparation method of surface modified aramid nanofiber and application of surface modified aramid nanofiber in all-solid-state polymer electrolyte and lithium battery - Google Patents
Preparation method of surface modified aramid nanofiber and application of surface modified aramid nanofiber in all-solid-state polymer electrolyte and lithium battery Download PDFInfo
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- 239000004760 aramid Substances 0.000 title claims abstract description 66
- 229920003235 aromatic polyamide Polymers 0.000 title claims abstract description 66
- 239000002121 nanofiber Substances 0.000 title claims abstract description 66
- 239000005518 polymer electrolyte Substances 0.000 title claims abstract description 35
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 20
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000007787 solid Substances 0.000 claims abstract description 32
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 19
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 19
- 239000006185 dispersion Substances 0.000 claims description 16
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 15
- 239000004593 Epoxy Substances 0.000 claims description 11
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 10
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 8
- 229910003002 lithium salt Inorganic materials 0.000 claims description 7
- 159000000002 lithium salts Chemical class 0.000 claims description 7
- HTZCNXWZYVXIMZ-UHFFFAOYSA-M benzyl(triethyl)azanium;chloride Chemical compound [Cl-].CC[N+](CC)(CC)CC1=CC=CC=C1 HTZCNXWZYVXIMZ-UHFFFAOYSA-M 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 6
- 125000003700 epoxy group Chemical group 0.000 claims description 6
- 229910003473 lithium bis(trifluoromethanesulfonyl)imide Inorganic materials 0.000 claims description 6
- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 claims description 6
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 claims description 5
- GKIPXFAANLTWBM-UHFFFAOYSA-N epibromohydrin Chemical compound BrCC1CO1 GKIPXFAANLTWBM-UHFFFAOYSA-N 0.000 claims description 5
- 239000012312 sodium hydride Substances 0.000 claims description 5
- 229910000104 sodium hydride Inorganic materials 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 4
- 239000000178 monomer Substances 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 4
- 229910013188 LiBOB Inorganic materials 0.000 claims description 3
- 238000007731 hot pressing Methods 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- LRWZZZWJMFNZIK-UHFFFAOYSA-N 2-chloro-3-methyloxirane Chemical compound CC1OC1Cl LRWZZZWJMFNZIK-UHFFFAOYSA-N 0.000 claims description 2
- 101150058243 Lipf gene Proteins 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 9
- 238000007151 ring opening polymerisation reaction Methods 0.000 abstract 2
- 238000010276 construction Methods 0.000 abstract 1
- 230000001351 cycling effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000007689 inspection Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000012528 membrane Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 2
- 239000012300 argon atmosphere Substances 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000012983 electrochemical energy storage Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011541 reaction mixture Substances 0.000 description 2
- 238000000967 suction filtration Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- MPPPKRYCTPRNTB-UHFFFAOYSA-N 1-bromobutane Chemical compound CCCCBr MPPPKRYCTPRNTB-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910010941 LiFSI Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000006735 epoxidation reaction Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011244 liquid electrolyte Substances 0.000 description 1
- VDVLPSWVDYJFRW-UHFFFAOYSA-N lithium;bis(fluorosulfonyl)azanide Chemical compound [Li+].FS(=O)(=O)[N-]S(F)(=O)=O VDVLPSWVDYJFRW-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002390 rotary evaporation Methods 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 229910001251 solid state electrolyte alloy Inorganic materials 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
The invention provides a preparation method of surface modified aramid nanofiber and application thereof in all-solid polymer electrolyte and lithium battery, wherein the surface modified aramid nanofiber is synthesized by a high-activity ring-opening polymerization process, the surface of the aramid nanofiber is modified by polyethylene glycol, the compatibility of the aramid nanofiber and the solid polymer electrolyte is enhanced, and the prepared material is applied to the solid polymer electrolyte with a composite structure; through inspection, the surface modified aramid nanofiber prepared by the invention remarkably enhances the mechanical properties of the solid polymer electrolyte. The strategy combines the ring-opening polymerization process and the construction of the solid polymer electrolyte with the composite structure, and jointly realizes the improvement of the electrochemical performance and the cycling stability of the all-solid lithium metal battery.
Description
Technical Field
The invention relates to the field of polymer electrolytes, in particular to a preparation method of surface modified aramid nanofiber and application of the surface modified aramid nanofiber in all-solid-state polymer electrolytes and lithium batteries.
Background
With the increasing global concern for environmental protection and the increasing energy crisis, the rapid development of renewable energy technologies is being promoted, wherein electrochemical energy storage systems play a vital role as a key technology for energy conversion and storage. In an electrochemical energy storage system, the all-solid-state lithium battery has wide development prospect due to the excellent safety performance and stability. The all-solid-state lithium battery adopts the solid electrolyte to replace the traditional liquid electrolyte, so that the safety of the battery can be remarkably improved, the electrolyte is prevented from leaking and volatilizing, and the battery has the characteristic of high energy density. In addition, the excellent performance of solid state electrolytes in terms of chemical and thermal stability has further driven the development of all-solid-state lithium battery technology.
Solid polymer electrolytes are receiving great attention as one of the core components of all-solid lithium batteries because of their good film forming properties, flexibility and processing convenience. Nevertheless, the current solid polymer electrolyte has many challenges in practical application, including poor high-voltage stability, poor mechanical strength, and high interfacial resistance, which seriously affect the electrochemical performance and safety of the battery. Blending fillers with polymer matrices to prepare composite structured solid polymer electrolytes is one of the effective ways to ameliorate the above problems and has become a hotspot in current research. In a plurality of filler systems, the aramid nanofiber has the characteristics of high strength, high modulus, high temperature resistance, flame retardance and the like, combines the nanoscale unique properties of the aramid nanofiber, such as high length-diameter ratio and large specific surface area, and has wide application prospect in the field of energy storage batteries. When applied as a filler to a composite structure solid polymer electrolyte, exhibits good cycle stability. However, due to the highly rigid structure of the aramid nanofibers and the weak interaction force between the PEO polymer backbones, the compatibility with the electrolyte interface is poor, thereby reducing the electrochemical performance of the battery. Accordingly, there is a need to provide a solution to improve the interfacial compatibility of aramid nanofibers with solid polymer electrolytes to overcome the above-described problems.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings in the prior art, and provides a preparation method of surface modified aramid nanofiber and application of the surface modified aramid nanofiber in all-solid polymer electrolyte and lithium batteries, wherein the technical scheme adopted by the invention is as follows:
in a first aspect, a method for preparing a surface modified aramid nanofiber is provided, comprising the steps of:
(1) Polyethylene glycol with a certain molecular weight and a small amount of catalyst are added into a proper amount of tetrahydrofuran, the mixture is stirred under argon atmosphere for 15min, then monomer containing epoxy groups is added, and the mixture is reacted at room temperature for 24: 24 h. Then, performing rotary steaming, washing and drying to prepare epoxy polyethylene glycol;
(2) And (3) mixing the aramid nanofiber with the product obtained in the step (1) in a proper proportion, carrying out 12h reaction treatment on the mixture at high temperature in an argon protection atmosphere, and carrying out suction filtration for multiple times to obtain the surface modified aramid nanofiber dispersion.
Further, the molecular weight of the polyethylene glycol in the step (1) is 200-10000.
Further, the catalyst in the step (1) is selected from one or more of sodium hydride, benzyl triethyl ammonium chloride and triphenylphosphine.
Further, the monomer containing epoxy group in the step (1) is selected from one of epoxy bromopropane, epoxy chloropropane and epoxy bromobutane.
Further, the mixing ratio of the aramid nanofibers to the epoxy polyethylene glycol in the step (2) is one of the molar ratio of 1:1, 1:1.3, 1:2 and 1:3.
Further, the high temperature range in the step (2) is 60-100 o ℃.
In a second aspect, the application of the surface modified aramid nanofiber prepared by the preparation method of the surface modified aramid nanofiber in a solid polymer electrolyte and an all-solid lithium metal battery also belongs to the protection scope of the invention; the application of the surface modified aramid nanofiber can effectively improve the electrochemical performance of the battery.
Preferably, the preparation method of the solid polymer electrolyte comprises the following steps:
(1) Dissolving surface modified aramid nanofibers and lithium salt in different proportions in acetonitrile, adding polyethylene oxide (PEO), and stirring to obtain uniform mixed solution;
(2) Pouring the mixed solution obtained in the step (1) into a polytetrafluoroethylene mould in batches, naturally airing and carrying out vacuum drying treatment, and then carrying out a hot pressing process to obtain the surface modified aramid nanofiber solid polymer electrolyte with a gradient structure.
Further, the proportion of the surface modified aramid nanofibers in the step (1) is 1% -20% of the mass ratio of PEO.
Further, the lithium salt in the step (1) is one or more selected from LiTFSI, liPF 6, liFSI and LiBOB.
The beneficial effects of the invention are as follows: the invention provides a preparation method of surface modified aramid nanofiber, which applies the surface modified aramid nanofiber prepared by the method to all-solid polymer electrolyte, thereby improving interface compatibility and enhancing mechanical strength; the composite solid polymer electrolyte is applied to an all-solid lithium metal battery, and the all-solid lithium metal battery has good electrochemical performance and cycle stability and wide application prospect.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
FIG. 1 is an X-ray photoelectron spectroscopy (XPS) chart of the aramid nanofibers before and after surface modification of example 1;
FIG. 2 is a tensile stress strain curve of the surface modified aramid nanofiber of example 1;
fig. 3 is a graph showing the rate discharge performance at 65 c and the long cycle performance at 0.5C rate of the lithium cobaltate all-solid state battery assembled from the all-solid state polymer electrolyte prepared in example 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
Example 1
(1) Preparation of epoxy polyethylene glycol: firstly, 5g polyethylene glycol (molecular weight 200) and 0.4 g sodium hydride are dissolved in a proper amount of tetrahydrofuran, and the mixture is stirred under argon atmosphere for 15 min to ensure the inert condition of a reaction system; next, 1.03 g of epibromohydrin was slowly added to the reaction mixture, and the reaction was continued at room temperature for 24: 24 h, to promote complete progress of the epoxidation reaction.
After the completion of the reaction, most of tetrahydrofuran was removed by rotary evaporation, followed by washing with an appropriate amount of n-hexane to remove unreacted residues and byproducts. Finally, the obtained product is dried at 60 ℃ for 12h to obtain epoxy polyethylene glycol.
(2) Preparation of surface modified aramid nanofibers: firstly, adding aramid nanofibers and epoxy polyethylene glycol into a three-neck flask according to the mol ratio of 1:1.3; in order to realize accurate regulation and control of the pH value of the solution, concentrated hydrochloric acid and ammonia water are then introduced to adjust the pH value of the solution to be within a target range; during the whole reaction, the vessel was placed under an argon-protected atmosphere and the reaction mixture temperature was maintained at 80 ℃ while continuously stirring 12h to promote the progress of the reaction; after the reaction is completed, repeatedly carrying out suction filtration by using deionized water and absolute ethyl alcohol to remove unreacted raw materials and byproducts, and finally obtaining the surface modified aramid nanofiber dispersion.
(3) Preparation of gradient composite solid polymer electrolyte membrane: firstly, surface modified aramid nanofibers accounting for 1% and 5% of the mass of PEO are respectively weighed, and added into acetonitrile together with 0.25 g bis (trifluoromethanesulfonyl imide) Lithium (LiTFSI) to prepare two surface modified aramid nanofiber dispersion liquids with different concentrations.
Next, the above-mentioned dispersions were transferred into a glove box free of water and oxygen, followed by adding 0.92 g PEO to each dispersion and continuing stirring for 12 hours to ensure adequate mixing; then casting the dispersion liquid containing 5% of the surface modified aramid nanofiber on a polytetrafluoroethylene die, and removing most acetonitrile through natural volatilization; next, a dispersion containing 1% surface-modified aramid nanofibers was added to the mold, and after evaporation of 12 h at room temperature, vacuum drying 24 to h was performed at 50 to 70 ℃ to ensure complete removal of acetonitrile.
Finally, the obtained gradient solid polymer electrolyte membrane is subjected to hot pressing for 2-10 min at the temperature of 60-100 ℃ and the pressure of 8-12 MPa by using a flat plate hot press and then cooled to room temperature, so that a round membrane with the thickness of 70-80 mu m and the diameter of 16.5 mm is prepared. When the lithium metal battery is assembled, the high-concentration side of the gradient composite solid polymer electrolyte is matched with a lithium cathode for use.
Example 2
The molecular weight of polyethylene glycol was 500, and the rest was the same as in example 1.
Example 3
The procedure of example 1 is followed except that polyethylene glycol is used to obtain a molecular weight of 5000.
Example 4
Benzyl triethylammonium chloride was used as a catalyst instead of sodium hydride, and the rest was the same as in example 1.
Example 5
Triphenylphosphine was used as a catalyst instead of sodium hydride, and the rest was the same as in example 1.
Example 6
The procedure of example 1 was repeated except that epichlorohydrin was used as the epoxy group instead of epibromohydrin.
Example 7
The procedure of example 1 was repeated except that epoxybromobutane was used as the epoxy group instead of epoxybromopropane.
Example 8
The mole ratio of the aramid nanofibers to the epoxy polyethylene glycol was adjusted to 1:1, and the rest was the same as in example 1.
Example 9
The mole ratio of the aramid nanofibers to the epoxy polyethylene glycol was adjusted to 1:2, and the rest was the same as in example 1.
Example 10
The mole ratio of the aramid nanofibers to the epoxy polyethylene glycol was adjusted to 1:3, and the rest was the same as in example 1.
Example 11
The procedure of example 1 was repeated except that 2% of the surface-modified aramid nanofiber dispersion was used instead of 1% of the surface-modified aramid nanofiber dispersion.
Example 12
The procedure of example 1 was followed except that 10% of the surface-modified aramid nanofiber dispersion was used instead of 5% of the surface-modified aramid nanofiber dispersion.
Example 13
The procedure of example 1 was repeated except that 10% of the surface-modified aramid nanofiber dispersion was used instead of 5% of the surface-modified aramid nanofiber dispersion and 2% of the surface-modified aramid nanofiber dispersion was used instead of 1% of the surface-modified aramid nanofiber dispersion.
Example 14
LiPF 6 was used instead of LiTFSI as a lithium salt, and the rest was the same as in example 1.
Example 15
LiFSI was used as a lithium salt instead of LiTFSI, and the rest was the same as in example 1.
Example 16
LiBOB was used as a lithium salt instead of LiTFSI, and the rest was the same as in example 1.
Example 17
A composite solid polymer electrolyte having a thickness of 40 μm was prepared by using a flat plate hot press, and the rest was the same as in example 1.
Example 18
The procedure of example 1 was followed using a gradient composite solid polymer electrolyte low concentration side matched lithium negative electrode.
Comparative example 1
The procedure of example 1 was followed except that no surface-modified aramid nanofibers were added to the PEO-based solid polymer electrolyte membrane.
Comparative example 2
The procedure of example 1 was followed except that no aramid nanofibers were added to the PEO-based solid polymer electrolyte membrane.
As can be seen from table 1, the assembled lithium cobaltate solid-state full battery using the all-solid-state polymer electrolyte prepared by the surface-modified aramid nanofiber of the present invention has higher capacity, better capacity retention rate and better coulombic efficiency than the comparative example.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. A preparation method of surface modified aramid nanofiber is characterized by comprising the following steps: polyethylene glycol is adopted to modify the surface of the aramid nanofiber.
2. The method for preparing the surface modified aramid nanofiber according to claim 1, wherein: the molecular weight of the polyethylene glycol is 200-10000.
3. The method for preparing the surface modified aramid nanofiber according to claim 1, which comprises the following steps:
(1) Adding polyethylene glycol, a catalyst and a monomer containing an epoxy group into tetrahydrofuran to prepare epoxy polyethylene glycol;
(2) And (3) mixing the aramid nanofiber with the product obtained in the step (1), and reacting at a high temperature to obtain the surface modified aramid nanofiber dispersion.
4. The method for preparing the surface modified aramid nanofiber according to claim 3, wherein: in the step (1), the catalyst is selected from one or more of sodium hydride, benzyltriethylammonium chloride and triphenylphosphine, and the monomer containing epoxy groups is selected from one of epoxybromopropane, epoxychloropropane and epoxybromobutane.
5. The method for preparing the surface modified aramid nanofiber according to claim 3, wherein: in the step (2), the mixing proportion of the aramid nanofibers and the epoxy polyethylene glycol is one of the mole ratios 1:1, 1:1.3, 1:2 and 1:3; the high temperature range is 60-100 o ℃.
6. An all-solid polymer electrolyte comprising the surface-modified aramid nanofiber prepared by the method for preparing the surface-modified aramid nanofiber as set forth in any one of claims 1 to 5.
7. The all-solid-state polymer electrolyte according to claim 6, wherein the preparation method thereof comprises:
(1) Adding the surface modified aramid nanofiber, lithium salt and polyethylene oxide into acetonitrile, and stirring to prepare uniform mixed solution;
(2) Pouring the mixed solution obtained in the step (1) into a polytetrafluoroethylene mould in batches, and carrying out natural volatilizing, vacuum drying and hot pressing to obtain the surface modified aramid nanofiber polymer electrolyte with the gradient structure.
8. The all-solid-state polymer electrolyte according to claim 7, wherein: the proportion of the surface modified aramid nanofibers in the step (1) accounts for 1% -20% of the mass of the polyethylene oxide.
9. The all-solid-state polymer electrolyte according to claim 7, wherein: in the step (1), the lithium salt is one or more selected from LiTFSI, liPF 6, liFSI and LiBOB.
10. A lithium battery comprising the all-solid polymer electrolyte of claim 6.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118326706A true CN118326706A (en) | 2024-07-12 |
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