K6Si2O7 potassium fast ion conductor synergistically doped with P<5+>, Al<3+> and Be<2+> ions and preparation method of K6Si2O7 potassium fast ion conductor

A technology of ion conductors and ions, which is applied in the field of manufacturing solid potassium fast ion conductors, to achieve the effect of reducing grain boundary gaps and reducing migration activation energy

Inactive Publication Date: 2019-10-25
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the potassium ion conductors that are essential for the construction of potassium ion all-solid-state batteries are still basically blank.

Method used

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  • K6Si2O7 potassium fast ion conductor synergistically doped with P&lt;5+&gt;, Al&lt;3+&gt; and Be&lt;2+&gt; ions and preparation method of K6Si2O7 potassium fast ion conductor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: K 2 CO 3 : NH 4 h 2 PO 4 :Al 2 o 3 : SiO 2 : BeO according to K 6.13 be 0.05 Al 0.05 P 0.02 Si 1.88 o 7 The ratio of the stoichiometric molar ratio is evenly mixed, adding quality is the dehydrated alcohol of mixture quality 3%, in ball mill with the rotating speed ball mill of 110 rev / mins 11 hours, after ball mill finishes, in 65 ℃ of vacuum ovens (gas pressure in the oven is at 5 Pa) for 2 hours, take it out and re-grind it in an agate mortar for 12 minutes, heat up the ground powder to 460°C in an air atmosphere at a rate of 6°C / min and keep it warm for 3 hours, then cool it with the furnace; The powder was ground again in an agate mortar for 10 minutes, and the ground powder was heated up to 760 °C at a rate of 5 °C / min in the air atmosphere for 10 hours and then cooled with the furnace; after grinding, it was oxidized in 0.1M hydrogen After soaking in sodium solution for 6 minutes, filter, dry and press at 1×10 7 Press it into thin slices ...

Embodiment 2

[0012] Example 2: K 2 CO 3 : NH 4 h 2 PO 4 :Al 2 o 3 : SiO 2 : BeO according to K 6.19 be 0.07 Al 0.07 P 0.02 Si 1.84 o 7 The ratio of the stoichiometric molar ratio is evenly mixed, adding quality is the dehydrated alcohol of mixture quality 5%, in ball mill with the rotating speed ball mill of 350 rev / mins 35 hours, after ball mill finishes, in 80 ℃ of vacuum ovens (gas pressure in oven is at 15Pa) for 7 hours, take it out and re-grind in an agate mortar for 25 minutes, and the ground powder is heated to 510°C at a rate of 20°C / min in an air atmosphere and then cooled with the furnace for 7 hours; The powder was ground again in an agate mortar for 21 minutes, and the ground powder was heated to 810°C at a rate of 10°C / min in an air atmosphere for 15 hours and then cooled with the furnace; after grinding, it was oxidized in 0.15M hydrogen After soaking in sodium solution for 10 minutes, filter, dry and press in a press at 3×10 7 Press it into thin slices under t...

Embodiment 3

[0013] Example 3: K 2 CO 3 : NH 4 h 2 PO 4 : Al 2 o 3 : SiO 2 : BeO according to K 6.26 be 0.1 Al 0.1 P 0.04 Si 1.76 o 7 The ratio of the stoichiometric molar ratio is evenly mixed, adding quality is the dehydrated alcohol of mixture quality 8.5%, in ball mill with the rotating speed ball mill of 500 rev / mins 45 hours, after ball mill finishes, in 100 ℃ of vacuum ovens (gas pressure in oven is at 18Pa) for 9 hours, take it out and re-grind in an agate mortar for 30 minutes, and the ground powder is heated to 540°C at a rate of 30°C / min in an air atmosphere and then cooled with the furnace after being kept for 9 hours; The powder was ground again in an agate mortar for 25 minutes, and the ground powder was heated to 820°C at a rate of 15°C / min in the air atmosphere and kept for 18 hours, then cooled with the furnace; after grinding, it was oxidized in 0.3M hydrogen After soaking in sodium solution for 13 minutes, filter, dry and press in a 7×10 7 Pressed into thin...

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Abstract

The invention relates to a K6Si2O7 potassium fast ion conductor synergistically doped with P<5+>, Al<3+> and Be<2+> ions and a preparation method of the K6Si2O7 potassium fast ion conductor. The K6Si2O7 potassium fast ion conductor is characterized in that the stoichiometric formula is K<6+2x+y-z>Be<x>Al<y>P<z>Si<2-x-y-z>O7, wherein <x>=0.05-0.10; <y>=0.05-0.10; <z>=0.02-0.05; and the normal temperature potassium ion conductivity exceeds 5*10<-4> S / cm. Al<3+> and Be<2+> are adopted to partially substitute for Si<4+> ions, and interstitial potassium ions are generated in crystals to reduce themigration activation energy of the potassium ions; the electronic conductivity of the fast ion conductor is further reduced through P<5+> doping; the size of migration channels of the potassium ions is adjusted through the doping of Be<2+> with a small ionic radius to adapt to the rapid migration of the potassium ions; and the surface of K6Si2O7 particles is modified in the preparation process toform the easy sintering characteristic. The synergistic effects enable the normal temperature potassium ion conductivity of the potassium fast ion conductor to exceed 5*10<-4> S / cm and be closer to the potassium ion conductivity of a liquid electrolyte.

Description

technical field [0001] The invention relates to the field of manufacturing a solid potassium fast ion conductor. 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 requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/16H01M10/0562H01M10/054
CPCC04B35/16C04B2235/3205C04B2235/3217C04B2235/442C04B2235/447C04B2235/6562C04B2235/6567C04B2235/96H01M10/054H01M10/0562H01M2300/0068Y02E60/10
Inventor 水淼舒杰任元龙
Owner NINGBO UNIV
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