B<3+>, Al<3+>, Mg<2+>, Y<3+> and S<2-> co-doped solid electrolyte Li7La3Zr2O12

A solid electrolyte and co-doping technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems that researchers have figured out, and achieve the effects of increasing the number, promoting lithium ion migration, and improving conductivity

Inactive Publication Date: 2013-01-09
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium ion migration mechanism of this solid electrolyte has not yet been fully understood by researchers.

Method used

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  • B&lt;3+&gt;, Al&lt;3+&gt;, Mg&lt;2+&gt;, Y&lt;3+&gt; and S&lt;2-&gt; co-doped solid electrolyte Li7La3Zr2O12

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: Li 2 CO 3 : Y 2 o 3 : La 2 o 3 :B 2 o 3 :Al 2 o 3 :MgO:ZrO 2 : thiourea is 3.7: 0.05: 1.45: 0.05: 0.05: 0.1: 1.7: 0.1 (molar ratio) ratio is evenly mixed, adds 2% 95% ethanol, ball mills 10 hours with the rotating speed of 250 rev / mins in ball mill, After ball milling, dry in a 60°C vacuum oven (vacuum degree 20Pa) for 10 hours, take it out and re-grind in an agate mortar for 15 minutes, and heat up the ground powder to 200°C at a rate of 5°C / min for 3 hours. Then heat up to 750°C at a rate of 5°C / min and keep warm for 6 hours, then heat up to 1150°C at a rate of 3°C / min and keep warm for 20 hours to make solid electrolyte powder. The powder is mixed with 2wt% binder PVC and kept under a pressure of 300MPa under a press for 5 minutes to form a thin sheet, which is heated to 1220°C at a rate of 11°C / min and kept for 10 hours in an air atmosphere to make a lithium ion solid Electrolyte sheets.

Embodiment 2

[0012] Embodiment 2: Li 2 CO 3 : Y 2 o 3 : La 2 o 3 :B 2 o 3 :Al 2 o 3 :MgO:ZrO 2 : thiourea is 4.0: 0.15: 1.35: 0.1: 0.1: 0.3: 1.3: 0.3 (molar ratio) ratio is evenly mixed, adds 5.5% 95% ethanol, ball mills 15 hours with the rotating speed of 380 rev / mins in ball mill, After ball milling, dry in 80°C vacuum oven (vacuum degree 95Pa) for 30 hours, take it out and re-grind in agate mortar for 20 minutes, and heat up the ground powder to 220°C at a rate of 6°C / min for 5 hours. Then the temperature was raised to 780°C at a rate of 8°C / min and kept for 10 hours, and then the temperature was raised to 1200°C at a rate of 7°C / min for 15 hours to make a solid electrolyte powder. The powder is mixed with 5wt% binder PVC and kept under a pressure of 450MPa under a press for 2 minutes to form a thin sheet. The thin sheet is heated to 1280°C at a rate of 15°C / min and kept for 10 hours in an air atmosphere to make a lithium-ion solid electrolyte. Flakes.

Embodiment 3

[0013] Embodiment 3: with Li 2 CO 3 : Y 2 o 3 : La 2 o 3 :B 2 o 3 :Al 2 o 3 :MgO:ZrO 2 : thiourea is 3.85: 0.1: 1.4: 0.075: 0.075: 0.2: 1.5: 0.2 (molar ratio) ratio is uniformly mixed, adds 3% 95% ethanol, ball mills 20 hours with the rotating speed of 300 rev / mins in ball mill, After ball milling, dry in a 70°C vacuum oven (vacuum degree 50Pa) for 20 hours, take it out and re-grind in an agate mortar for 10 minutes, and heat up the ground powder at a rate of 9°C / min to 250°C for 5 hours. Then the temperature was raised to 800°C at a rate of 10°C / min and kept for 7 hours, and then the temperature was raised to 1250°C at a rate of 2°C / min for 12 hours to make a solid electrolyte powder. The powder is mixed with 1wt% binder PVA and kept under a pressure of 300MPa under a press for 6 minutes to form a thin sheet, which is heated to 1300°C at a rate of 15°C / min and kept for 18 hours in an air atmosphere to make a lithium ion solid Electrolyte sheets.

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Abstract

The invention discloses a B<3+>, Al<3+>, Mg<2+>, Y<3+> and S<2-> co-doped solid electrolyte Li7La3Zr2O12 which is characterized in that a chemometry formula is Li7+y1+y2+2y3YxLa3-xBy1Aly2Mgy3Zr2-y1-y2-y3O12-mSm, wherein x=0.1-0.3; y1=0.1-0.2; y2=0.1-0.2; y3=0.1-0.3; m=0.1-0.3; and the B<3+>, Al<3+>, Mg<2+>, Y<3+> and S<2-> co-doped solid electrolyte Li7La3Zr2O12 is prepared by the steps of uniformly mixing Li2CO3, Y2O3, La2O3, Al2O3, MgO, ZrO2 and thiourea according to a mole ratio of (3.7-4.0):(0.05-0.15):(1.35-1.45):(0.05-0.1):(0.05-0.1):(0.1-0.3):(1.3-1.7):(0.1-0.3), ball-grinding, pressing and sintering. A room-temperature lithium ion conductivity of more than 5*10<-4>S/cm can be obtained.

Description

technical field [0001] The invention relates to the field of manufacturing a solid lithium ion electrolyte. Background technique [0002] Lithium-ion batteries have absolute advantages such as high volume, high weight-to-energy ratio, high voltage, low self-discharge rate, no memory effect, long cycle life, and high power density. They have an annual share of more than 30 billion US dollars in the global mobile power market and far exceed other The market share of batteries is the most promising chemical power source [Wu Yuping, Wan Chunrong, Jiang Changyin, Lithium-ion Secondary Batteries, Beijing: Chemical Industry Press, 2002.]. At present, most of the lithium-ion secondary batteries at home and abroad use liquid electrolytes. Liquid lithium-ion batteries have some disadvantages, such as: liquid organic electrolytes may leak, and may explode at too high a temperature, causing safety accidents, and cannot be used in some applications. Occasions with high safety requiremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562
CPCY02E60/12Y02E60/10
Inventor 水淼杨天赐舒杰程亮亮冯琳任元龙郑卫东高珊
Owner NINGBO UNIV
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