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Solid electrolyte, preparation method thereof and all-solid-state lithium metal battery
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A solid electrolyte, lithium bis-trifluoromethylsulfonimide technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, composite electrolytes, etc., can solve the problems of poor membrane processing performance, battery capacity attenuation, etc., and achieve stable performance. , smooth morphology, and the effect of improving lithium ion migration number
Pending Publication Date: 2022-05-27
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Unfortunately, GO still agglomerates and detaches in the PEO matrix, resulting in poor processability of the film and rapid capacity fading of the battery.
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[0047] The embodiment of the present application provides a preparation method of a solid electrolyte, comprising the following steps:
[0049] S21. Add dimethyl sulfoxide, pyridine and triphenyl phosphite into the container, then add ethoxy-containing polyionic liquid and stir, then add graphene oxide, and reflux at 95-105°C for 10-15 hours , after centrifugation, precipitation is obtained, washed, and dried to obtain polyionic liquid-modified graphene oxide;
[0050] S31, adding polyethylene glycol and lithium bistrifluoromethanesulfonimide to acetonitrile and mixing to form a homogeneous solution, dispersing the graphene oxide modified by the polyionic liquid into the homogeneous solution, and pouring it on a mold after stirring , and then heated at 45 to 55 ° C for 4 to 8 hours, and the solid electrolyte was obtained after drying.
[0051] In some embodiments, the preparation method of ethoxy-containing polyioni...
Embodiment 1
[0065] The embodiment of the present application provides a preparation method of a solid electrolyte, comprising the following steps:
[0066] S1, prepare the polyionic liquid (ox-PIL) containing ethoxy group, and the preparation method of this polyionic liquid containing ethoxy group is specifically:
[0067] S11. Add 4.85 g of 1.8-diamino-3.6-dioxoctane, 4 mL of acetic acid, 4.85 mL of glyoxal, 2.5 mL of formaldehyde and 10 mL of deionized water into a 100 mL round-bottomed flask under an ice bath and mix, Then, it was condensed and refluxed for 2.5 hours at 100 °C, washed with acetone to obtain a brown viscous precursor, and then the precursor was placed in a vacuum oven and dried at 60 °C for 12 hours for later use;
[0068] S12. Dissolve the precursor in deionized water to prepare 10 mg mL -1 The solution was added dropwise to an aqueous solution of 0.1M lithium bis-trifluoromethanesulfonamide (LiTFSI), stirred at room temperature for 36 h, and precipitated after standi...
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Abstract
The invention provides a solidelectrolyte, a preparation method thereof and an all-solid-state lithiummetal battery, and the solidelectrolyte is prepared by the following steps: adding dimethyl sulfoxide, pyridine and triphenyl phosphite into a container, then adding ethyoxyl-containing polyion liquid, stirring, then adding grapheneoxide, and reacting polyion liquid modified grapheneoxide; and adding polyethylene glycol and lithium bis (trifluoromethylsulfonyl) imide into acetonitrile, mixing to form a homogeneous solution, dispersing the polyion liquid modified grapheneoxide into the homogeneous solution, and pouring on a mold to obtain the solid electrolyte. The polyion liquid (ox-PIL) containing ethyoxyl is grafted to the graphene oxide and used as an additive for the PEO-based organic / inorganic composite all-solid-state polymer electrolyte, and the electrolyte has uniform and smooth morphology, good dispersity, stable polymer electrolyte performance, reduced crystallinity, high ionic conductivity, high mechanical strength and high lithiumion transference number.
Description
technical field [0001] The invention relates to the technical field of all-solid-state lithium metal batteries, in particular to a solid-state electrolyte and a preparation method thereof, and an all-solid-state lithium metal battery. Background technique [0002] All-solid-state lithium metal batteries are becoming the mainstream of next-generation rechargeable batteries due to their high energy density, good machinability, and high safety. Solid electrolyte is one of the core components of solid-state lithium metal batteries. The ionic conductivity of inorganic solid electrolytes such as sulfides can reach 10-2S cm -1 The above, but the interface compatibility with lithium metalanode and cathode material is poor, the film processing performance is poor, and it is unstable. All-solid-state polymer electrolytes, such as polyacrylonitrile, polyvinylidene fluoride and its derivatives, and polyethylene oxide, have received increasing attention due to their good machinability...
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