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Gd doped Li7La3Zr2O12 johnstonotite type solid electrolyte for all-solid-state lithium ion battery

A lithium-ion battery, solid electrolyte technology, used in secondary batteries, circuits, electrical components, etc.

Inactive Publication Date: 2018-02-23
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Li 7 La 3 Zr 2 o 12 (LLZO) garnet-type oxide has attracted more and more attention because of its high lithium-ion conductivity and high chemical stability to metallic lithium, but if it is applied to all-solid-state lithium-ion batteries, its conductivity still needs to be further improved

Method used

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  • Gd doped Li7La3Zr2O12 johnstonotite type solid electrolyte for all-solid-state lithium ion battery
  • Gd doped Li7La3Zr2O12 johnstonotite type solid electrolyte for all-solid-state lithium ion battery
  • Gd doped Li7La3Zr2O12 johnstonotite type solid electrolyte for all-solid-state lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to Li 7.2 La 3 Zr 1.8 Gd 0.2 o 12 The stoichiometric ratio of each content in (LLZG2O) weighs Li 2 CO 3 (or LiOH), La(OH) 3 (or La 2 o 3 ), ZrO 2 and Gd 2 o 3 The analytically pure reagent is placed in a ball mill jar, and isopropanol is used as a solvent, wherein the weight ratio "raw material: ball: isopropanol" is 1-2:1-3:1-2. Put it on a ball mill for 24 hours, then dry it in an oven at 80°C and place it in a muffle furnace for calcination at 850°C to 1000°C for 20 to 30 hours, then press it into tablets, and finally put the pressed tablets in Calcined at 1100-1250°C for 24-48 hours in a muffle furnace, the X-ray diffraction (XRD) pattern of the prepared solid electrolyte sheet is shown in figure 1 .

Embodiment 2

[0022] According to Li 7.2 La 3 Zr 1.8 Gd 0.2 o 12 The stoichiometric ratio of each content in (LLZG2O) weighs Li 2 CO 3 (or LiOH), La(OH)3 (or La 2 o 3 ), ZrO 2 and Gd 2 o 3 The analytically pure reagent is placed in a ball mill jar, and isopropanol is used as a solvent, wherein the weight ratio "raw material: ball: isopropanol" is 1-2:1-3:1-2. Put it on a ball mill for 24 hours, then dry it in an oven at 80°C and place it in a muffle furnace for calcination at 850°C to 1000°C for 20 to 30 hours, then press it into tablets, and finally put the pressed tablets in Gd-doped Li 7 La 3 Zr 2 o 12 Solid Electrolyte Sheet. The prepared solid electrolyte sheets were polished on 400-mesh and 800-mesh sandpaper respectively, using isopropanol as a solvent for wet grinding. Afterwards, the polished solid electrolyte sheet was cleaned with isopropanol and ultrasonically cleaned in a beaker filled with isopropanol for half an hour, then taken out and placed in an oven for d...

Embodiment 3

[0024] Doping the prepared Gd with Li 7 La 3 Zr 2 o 12 The solid electrolyte sheet is polished to a thickness of 0.3-1mm, and the AC impedance measurement is performed on the polished solid electrolyte sheet. The specific steps are: first coat the silver paste on one side of the solid electrolyte sheet as an electrode, and connect it to the silver wire, then place it in an oven at 100-150°C for drying, and then apply the silver paste on the solid electrolyte sheet in the same way. The other side of the electrolyte sheet is also connected to the silver wire, and then it is sintered in a muffle furnace at 300-600°C for 2-5 hours, and then the AC impedance of the solid electrolyte sheet is measured, as shown in image 3 shown.

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Abstract

The invention relates to a solid electrolyte of an all-solid-state lithium ion battery, in particular to a Gd doped Li7La3Zr2O12 johnstonotite type solid electrolyte and application thereof in the all-solid-state lithium ion battery. A preparation process of the Gd doped Li7La3Zr2O12 johnstonotite type solid electrolyte comprises the following steps: (1) mixing raw materials through ball milling;(2) roasting in a muffle furnace of which the temperature is 850 to 1000 DEG C, thus obtaining concentrated powder; (3) tabletting the concentrated powder, and roasting in a muffle furnace of which the temperature is 1100 to 1250 DEG C, thus obtaining a solid electrolyte tablet; (4) assembling the all-solid-state lithium ion battery in a glove box; (5) testing electrochemical performance of a battery by adopting an electrochemical instrument. The preparation method disclosed by the invention is simple in operation, the prepared solid electrolyte tablet is Gd doped Li7La3Zr2O12 which is of a johnstonotite structure, and very good lithium ion conductivity and a very good lithium dendrites inhibiting function are obtained; by applying the Gd doped Li7La3Zr2O12 johnstonotite type solid electrolyte to the all-solid-state lithium ion battery, the safety performance and the charge-discharge cycling performance of the battery can be increased.

Description

(1) Technical field [0001] The invention relates to a solid electrolyte for an all-solid lithium ion battery, specifically a Li electrolyte that partially replaces Zr by Gd doping 7 La 3 Zr 2 o 12 Garnet-type solid electrolyte and its application to all-solid-state lithium-ion batteries. (2) Background technology [0002] Driven by the rapid development of electric vehicles and the urgent need for portable high-specificity energy storage systems, a large number of new forms, new technologies, and new materials of power equipment continue to emerge, and are moving towards high safety performance, long duration, environmental friendliness, and convenience. Development in the direction of use and commercialization. Power devices that have been developed so far include supercapacitors, fuel cells, lithium-air batteries, lithium-ion batteries, etc. Among them, the most widely used is the lithium-ion battery. Lithium-ion batteries have the characteristics of high energy dens...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCH01M10/0565Y02E60/10
Inventor 宋世栋陈步天于利梅孙建杜婷婷范芳芳秦旭辉路楠
Owner TIANJIN POLYTECHNIC UNIV
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