Unlock instant, AI-driven research and patent intelligence for your innovation.

Modification layer for solid-state lithium battery electrode/solid electrolyte interface and preparation method thereof and application

A solid electrolyte and battery electrode technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of no improvement of the positive side interface, large interface impedance, poor conductivity, etc., to improve the interface electrochemical Stability, lower interface impedance, low cost effect

Active Publication Date: 2020-01-10
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI +1
View PDF8 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, ALD or CVD is used to plate Si on the surface of Garnet-type oxide ceramic electrolyte (Luo W, Gong Y, Zhu Y, et al. Journal of the American Chemical Society, 2016, 138(37): 12258-12262.), ZnO (Wang C, Gong Y, Liu B, etal. Nano letters, 2016, 17(1): 565-571.) or Al 2 o 3 (Han X, Gong Y, Fu K K, et al.Naturematerials,2017,16(5):572.), in order to reduce the interfacial impedance with lithium metal, but these methods do not improve the positive side interface, and the cost higher
Li et al. used ionic liquid to blend with positive electrode material and conductive carbon in sodium metal solid-state battery and then coated on β-Al 2 o 3 Electrolyte surface (Liu L, Qi X, Ma Q, et al. ACS applied materials & interfaces, 2016, 8(48): 32631-32636.), while improving the poor ion and electronic conductivity in the positive electrode sheet and the large interface impedance when in contact with the electrolyte problem, but it needs to use a large amount of ionic liquid, so the cost is higher

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Modification layer for solid-state lithium battery electrode/solid electrolyte interface and preparation method thereof and application
  • Modification layer for solid-state lithium battery electrode/solid electrolyte interface and preparation method thereof and application
  • Modification layer for solid-state lithium battery electrode/solid electrolyte interface and preparation method thereof and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] As a LiFePO 4 An example of the preparation method of the positive electrode sheet, including: first LiFePO 4 Powder, conductive carbon, and binder are mixed in N-methylpyrrolidone at a mass ratio of 8:1:1, and then ball milled for 6 hours to obtain a uniform slurry, and then the slurry is coated on the Aluminum foil, dried and cut into discs with a diameter of 12mm.

[0048] As an example of the preparation method of an S / C composite positive electrode, it includes: first dispersing S / C powder, conductive carbon, and binder with a sulfur content of 70wt% in distilled water at a mass ratio of 8:1:1, and then Uniform slurry was obtained after ball milling for 6 hours, and then the slurry was coated on aluminum foil using a roll-to-roll coater, dried and cut into discs with a diameter of 12 mm.

[0049] In the present disclosure, there is no restriction on the structure of the solid-state lithium battery, which may be a plastic-sealed pouch battery, a tubular battery, o...

Embodiment 1

[0052] (1) Preparation of NASICON-type solid electrolyte Li by solid-state sintering method 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 Ceramic sheet (a disc with a diameter of 1.4 cm);

[0053] (2) Disperse 0.2g of 1-vinyl-3-ethylimidazole bistrifluoromethanesulfonimide salt, 0.3g of lithium hexafluorophosphate, and 0.01g of 1-hydroxy-cyclohexyl-phenyl ketone in 1.49g of tetrahydrofuran to form a single Body dispersion;

[0054] (3) Take 20 μL of the monomer dispersion in step (2) to the surface of the above-mentioned ceramic sheet, at a wavelength of 256 nm and an intensity of 60 μW / cm 2 Irradiate under ultraviolet light for 3min, remove the light source. like figure 2 As shown, after the solvent is completely evaporated, the thickness of the obtained modified layer is about 2 μm. Then attach a metal lithium negative electrode (a disc with a diameter of 1.2 cm) on its surface;

[0055] (4) Take 20 μL of the monomer dispersion liquid in step (2) to the other surface of the ceramic ...

Embodiment 2

[0059] (1) Preparation of Garnet-type solid electrolyte Li by solid-state sintering method 6.4 La 3 Zr 1.4 Ta 0.6 o 12 Ceramic sheet (a disc with a diameter of 1.4 cm);

[0060](2) Disperse 0.2g of 1-vinyl-3-ethylimidazole bistrifluoromethanesulfonimide salt, 0.3g of lithium hexafluorophosphate, and 0.01g of 1-hydroxy-cyclohexyl-phenyl ketone in 1.49g of tetrahydrofuran to form a single Body dispersion;

[0061] (3) Take 20 μL of the monomer dispersion in step (2) to the surface of the above-mentioned ceramic sheet, at a wavelength of 256 nm and an intensity of 60 μW / cm 2 Irradiate under ultraviolet light for 3 minutes, remove the light source, and wait until the solvent is completely evaporated, and the thickness of the obtained modified layer is about 2 μm. Then attach a lithium indium alloy negative electrode (a disc with a diameter of 1.2cm) on its surface;

[0062] (4) Take 20 μL of the monomer dispersion in step (2) to the other surface of the ceramic sheet and th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
electrical conductivityaaaaaaaaaa
electrical conductivityaaaaaaaaaa
electrical conductivityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a modification layer for a solid-state lithium battery electrode / solid electrolyte interface and a preparation method thereof and application. The modification layer comprisesthe following components: a polymer formed by polymerizing an alkenyl functionalized ionic liquid monomer, a lithium salt and a photoinitiator, wherein the mass ratio of the polymer formed by polymerizing the alkenyl functionalized ionic liquid monomer to the lithium salt to the photoinitiator is (10-20) to (5-10) to (0.2-2).

Description

technical field [0001] The invention relates to a modification layer for a solid-state lithium battery electrode / solid electrolyte interface, a preparation method and application thereof, and belongs to the field of solid-state lithium batteries. Background technique [0002] Today, lithium-ion batteries have been widely used in portable electronic products, and have broad application prospects in smart grids and electric vehicles. However, the electrolytes currently used in commercial lithium-ion batteries are mostly organic electrolytes, which generally have disadvantages such as flammability, leakage, and poor thermal stability, which limit the development and application of lithium-ion batteries to a certain extent. All-solid-state lithium batteries with solid electrolytes have good safety. In addition, compared with ordinary liquid electrolytes, inorganic solid electrolytes usually have a higher electrochemical window (above 5V), which can match high-voltage cathode ma...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0562H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 温兆银孙昌志朱冠楠靳俊王庆苏建猛冯奇
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI