Inorganic filler composite PEO solid electrolyte material, preparation method thereof, and all-solid-state battery

A solid electrolyte and solid electrolyte layer technology, applied in the field of lithium ion batteries, can solve problems such as low ionic conductivity, achieve high ionic conductivity, good mechanical properties, and improve interface stability.

Active Publication Date: 2018-12-07
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS +1
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  • Abstract
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Problems solved by technology

[0006] However, the ionic conductivity of the polymer composite solid electrolyte prepared by the above method is still relatively low at room temperature, and it can only be operated at high temperature in practical applications, and the inorganic filler composited with the PEO matrix is ​​a non-lithium ion conductor, which is not suitable for PEO. There is still room for improvement in the compounding of base polymers

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  • Inorganic filler composite PEO solid electrolyte material, preparation method thereof, and all-solid-state battery
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  • Inorganic filler composite PEO solid electrolyte material, preparation method thereof, and all-solid-state battery

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preparation example Construction

[0034] The invention relates to a preparation method of an inorganic powder composite PEO solid electrolyte material and its application in an all-solid-state battery.

[0035] The inorganic filler composite PEO solid electrolyte material of the present invention consists of the following components by mass percentage:

[0036] Polyethylene oxide 5% to 80%;

[0037] Inorganic powder 1% to 80%;

[0038] Lithium salt 1% to 30%.

[0039] This method uses polyethylene oxide (PEO) as the matrix of solid electrolyte (the viscosity-average molecular weight Mv of PEO: 5×10 3 ~9×10 6 ). Inorganic electrolyte Li with high lithium-ion conductivity was chosen 7 La 3 Zr 2 o 12 (LLZO), Li 10 GeP 2 S 12 (LGPS), Li 2 O-Al 2 o 3 -TiO 2 -P 2 o 5One of (LATP) is used as an inorganic filler material, and lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium perchlorate, lithium bistrifluoromethanesulfonylimide, lithium difluoroborate, LiBOB, ...

Embodiment 1

[0042] Weigh 0.10g lithium perchlorate (LiClO 4 ) powder, 5.00g polyethylene oxide (PEO) powder and 0.20g Li 7 La 3 Zr 2 o 12 (LLZO) powder was vacuum-dried for 24 hours, and the viscosity-average molecular weight Mv of the PEO powder used was 9×10 5 . Lithium perchlorate (LiClO 4 ) powder was dispersed and placed in a 1L three-necked round-bottomed flask containing nitrile solution with reflux condensation and a stirrer and mechanically stirred for 10 to 30 minutes until completely dissolved, and then the dried Li 7 La 3 Zr 2 o 12 (LLZO) powder is gradually added to the uniformly mixed solution, and after ultrasonic dispersion for 30-60 minutes, it is completely dispersed in the solution under mechanical stirring. Stir mechanically for 12h to 24h to form a uniform suspension.

[0043] The above-mentioned vacuum drying process is as follows: the raw material powder is placed in a vacuum drying oven, the set temperature is 60°C, and it is taken out after drying for 24...

Embodiment 2

[0046] Weigh 0.10g lithium bistrifluoromethanesulfonylimide (LiTFSI) powder, 5.00g polyethylene oxide (PEO) powder and 0.20g Li 7 La 3 Zr 2 o 12 (LLZO) powder was vacuum-dried for 24h, and the viscosity-average molecular weight Mv of the PEO powder used was 6×10 5 . Disperse the vacuum-dried lithium bistrifluoromethanesulfonylimide (LiTFSI) powder in a 1L three-necked round-bottomed flask with reflux condensation and a stirrer containing the nitrile solution, and mechanically stir for 10 to 30 minutes until completely dissolved, then Then the dried Li 7 La 3 Zr 2 o 12 (LLZO) powder is gradually added to the uniformly mixed solution, ultrasonically dispersed for 30 to 60 minutes, then completely dispersed in the solution under mechanical stirring, and finally dry polyethylene oxide (PEO) is added and kept at 60°C to 90°C Stir mechanically for 12h to 24h to form a uniform suspension.

[0047] The above-mentioned vacuum drying process is as follows: the raw material powd...

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Abstract

The invention discloses an inorganic filler composite PEO solid electrolyte material, a preparation method thereof, and an all-solid-state battery. The all-solid-state battery includes a positive electrode layer, a negative electrode layer and a composite solid electrolyte layer, and the composite solid electrolyte layer is positioned between the positive electrode layer and the negative electrodelayer, and adopts the inorganic filler composite PEO solid electrolyte material. The inorganic filler composite PEO solid electrolyte material includes polyoxyethylene, an inorganic powder having a high ionic conductivity, and a lithium salt. The preparation method comprises the following steps: A, adding the lithium salt to an organic solvent, and performing stirring until the lithium salt is completely dissolved; B, adding the inorganic powder to the above obtained solution, and performing uniform stirring; C, adding the polyoxyethylene to the above obtained mixed solution, and performing stirring to obtain a suspension; and D, pouring the suspension into a mold, and drying the suspension to obtain the solid electrolyte material. The inorganic filler composite PEO solid electrolyte material has a high ionic conductivity and good mechanical performances, the assembled all-solid-state battery can effectively improve the interface stability between the electrolyte and negative electrode metal lithium, and has high rate performances.

Description

[technical field] [0001] The present invention relates to lithium-ion batteries, in particular to an inorganic filler composite PEO solid electrolyte material, a preparation method and an all-solid-state battery. [Background technique] [0002] Due to many advantages such as high energy density, low self-discharge rate, long service life and environmental friendliness, lithium-ion batteries have been widely used in portable devices such as mobile phones, notebook computers and digital cameras since they were commercialized in 1991. The electrolyte is an essential part of the lithium-ion battery, which not only plays the role of transporting ions in the positive and negative electrodes, but also plays a key factor in the specific energy, cycle performance, rate performance and safety performance of the battery. [0003] At present, the electrolyte in lithium-ion batteries is generally an organic liquid electrolyte, which includes lithium salts and solvents. During use, there ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0065H01M2300/0091Y02E60/10
Inventor 陈斐阳敦杰查文平戴晓兵沈强张联盟
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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