Preparation method of Rb-doped ternary composite solid electrolyte

A technology of solid electrolyte and ternary compound, which is applied in the direction of solid electrolyte, electrolyte battery manufacturing, electrolyte, etc., and can solve the problems of insufficient lithium ion conductivity and other problems

Pending Publication Date: 2021-07-06
光鼎铷业(广州)集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above modified solid electrolytes still have problems such as insufficient lithium ion conductivity.

Method used

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  • Preparation method of Rb-doped ternary composite solid electrolyte
  • Preparation method of Rb-doped ternary composite solid electrolyte
  • Preparation method of Rb-doped ternary composite solid electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A preparation method of a sandwich-like ternary composite solid state electrolyte doped with Rb, comprising the following steps:

[0032] (a) Preparation of rubidium-doped LLZTO solid electrolyte powder: LiOH, La(OH) 3 , ZrO 2 、Ta(OH) 5 , RbCl 3Add a dispersant at a molar ratio of 7:3:2:0.5:0.2 and mix thoroughly in a ball mill at 600r / min for 15 hours, then roast at a high temperature of 800°C for 12 hours, ball mill for 6 hours to form a powder, and add a dispersant to form rubidium-doped LLZTO slurry;

[0033] (b) Pour the LLZTRO ceramic slurry on both sides of the 80μm polymer PEO substrate, soak the ceramic slurry to both sides of the polymer substrate, and then put it in a vacuum furnace at 120°C for drying, and use a uniaxial pressure method under 100MPa Press the tablet machine into a sheet-shaped ceramic electrolyte with a thickness of 100 microns;

[0034] (c) Soak the flake electrolyte in ionic liquid (EMI 0.8 Li 0.2 ][TFSI]) for 12h, vacuum-dried at 1...

Embodiment 2

[0036] A preparation method of a sandwich-like ternary composite solid state electrolyte doped with Rb, comprising the following steps:

[0037] (a) Preparation of rubidium-doped LLZTO solid electrolyte powder: LiOH, La(OH) 3 , ZrO 2 、Ta(OH) 5 , RbCl 3 Add dispersant at a molar ratio of 7:3:2:0.5:0.5, mix thoroughly in a ball mill at 600r / min for 15 hours, roast at 1000°C for 12 hours, ball mill for 6 hours to form a powder, and add dispersant to form rubidium-doped LLZTO slurry;

[0038] (b) Pour the LLZTO ceramic slurry on both sides of the 80μm polymer PEO substrate, soak the ceramic slurry to both sides of the polymer substrate, and then put it in a vacuum furnace at 120°C for drying, and use a uniaxial pressure method under 200MPa Press the tablet machine into a sheet-shaped ceramic electrolyte with a thickness of 100 microns;

[0039] (c) Soak the flake electrolyte in ionic liquid (EMI 0.8 Li 0.2 ][TFSI]) for 12h, vacuum-dry the solid electrolyte at 100°C to form ...

Embodiment 3

[0041] A preparation method of a sandwich-like ternary composite solid state electrolyte doped with Rb, comprising the following steps:

[0042] (a) Preparation of rubidium-doped LLZTO solid electrolyte powder: LiOH, La(OH) 3 , ZrO 2 、Ta(OH) 5 , RbCl 3 Add dispersant at a molar ratio of 7:3:2:1:1, mix thoroughly in a ball mill at 600r / min for 15 hours, roast at a high temperature of 1100°C for 15 hours, ball mill for 6 hours to form a powder, and add a dispersant to form rubidium-doped LLZTO slurry;

[0043] (b) Pour the LLZTO ceramic slurry on both sides of the polymer substrate, soak the ceramic slurry on both sides of the polymer PAN substrate, then put it in a vacuum oven at 120°C for drying, and use a uniaxial press at 300MPa to press the tablet machine Pressed into a sheet-shaped ceramic electrolyte with a thickness of 75 microns;

[0044] (c) Soak the flake electrolyte in ionic liquid (EMI 0.8 Li 0.2 ][TFSI]) for 18h, vacuum-dry the thin-sheet solid electrolyte a...

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Abstract

The invention discloses a preparation method of a Rb-doped ternary composite solid electrolyte, which comprises the following steps: dissolving LLTZRO powder synthesized by a solid-phase chemical ball milling method in a dispersion liquid, stirring to form slurry, pouring the slurry to two sides of a polymer substrate, drying, pressing into sheets, fully soaking in a functional ionic liquid, and drying in the air, thereby obtaining the Rb-doped ternary composite solid electrolyte. In the composite solid electrolyte, rubidium ions form large-aperture ion gaps in the LLZTO garnet solid electrolyte and increase ion transmission channels, so that the ionic conductivity of a garnet crystal structure is improved; meanwhile, a composite solid electrolyte with a polymer as a main body is formed, the flexible processing performance of the electrolyte is improved on the basis of keeping the ionic conductivity, the ionic liquid is modified and impregnated into the flaky electrolyte, the ionic liquid can fully fill tiny gaps in the structure and bridge LLZTO particles, and an effective channel is formed for lithium ions. The conductivity is improved, and an ultrathin solid electrolyte sheet can be formed under the condition of tabletting and forming.

Description

technical field [0001] The invention belongs to the technical field of preparation of solid-state electrolytes for lithium-ion batteries, and in particular relates to a Rb-doped garnet-type LLZTO solid-state electrolyte, a composite solid-state electrolyte of a polymer and an ionic liquid, and a preparation method thereof. Background technique [0002] With the rapid development of new energy electric vehicles, lithium-ion batteries with high energy density are highly valued by more and more researchers. In traditional liquid electrolytes, the unstable deposition and dendrite growth of Li metal in the anode will cause a series of safety issues, which seriously hinder the development of Li metal anodes. Compared with liquid electrolytes, solid electrolytes have high ionic conductivity, good mechanical strength, non-flammability, and chemical stability, which can perfectly solve the safety problem of lithium dendrites in lithium batteries, and can match lithium metal negative ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/058H01M10/0525H01M10/42
CPCH01M10/056H01M10/058H01M10/0525H01M10/4235H01M2300/0091H01M2300/0065Y02P70/50Y02E60/10
Inventor 唐浩林王仲明陈智伟陈志华詹心泉
Owner 光鼎铷业(广州)集团有限公司
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