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B<3+> and Al<3+> ion collaboratively doped K6Si2O7 potassium fast ion conductor and preparation method thereof

A technology of ion conductors and ions, which is applied in the field of manufacturing solid potassium fast ion conductors, to achieve the effects of reducing grain boundary gaps, improving potassium ion conductivity, 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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  • B&lt;3+&gt; and Al&lt;3+&gt; ion collaboratively doped K6Si2O7 potassium fast ion conductor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: K 2 CO 3 :Al 2 o 3 : SiO 2 :B 2 o 3 According to K 6.1 B 0.05 Al 0.05 Si 1.9 o 7 The ratio of the stoichiometric molar ratio is evenly mixed, adding quality is the dehydrated alcohol of 4% of mixture quality, ball milling 15 hours with the rotating speed of 120 rev / mins in ball mill, after ball milling finishes, in 70 ℃ of vacuum ovens (gas pressure in oven is at 5Pa) for 2 hours, take it out and re-grind it in an agate mortar for 10 minutes, heat up the ground powder to 460°C in an air atmosphere at a rate of 7°C / min and keep it warm for 3 hours, then cool it in the furnace; The powder was ground again in an agate mortar for 10 minutes, and the ground powder was heated up to 750°C at a rate of 5°C / min in an 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 5 minutes, filter, dry and press in 1×10 7 Pressed into thin slices under the pressure of Pa, p...

Embodiment 2

[0012] Example 2: K 2 CO 3 :Al 2 o 3 : SiO 2 :B 2 o 3 According to K 6.2 B 0.1 Al 0.1 Si 1.8 o 7 The ratio of the stoichiometric molar ratio is uniformly mixed, adding quality is the dehydrated alcohol of mixture quality 9%, in ball mill with the rotating speed ball mill of 500 rev / mins 50 hours, after ball mill finishes, in 110 ℃ of vacuum ovens (gas pressure in the oven is at 20Pa) for 9 hours, take it out and re-grind in an agate mortar for 30 minutes, the ground powder is heated to 550°C at a rate of 30°C / min in an air atmosphere and then cooled with the furnace for 10 hours; The powder was ground again in an agate mortar for 30 minutes, and the ground powder was heated to 845 °C at a rate of 15 °C / min in the air atmosphere for 19 hours and then cooled with the furnace; after grinding, it was oxidized in 0.3M hydrogen After soaking in sodium solution for 12 minutes, filter, dry and press in a 7×10 7 Press it into thin slices under the pressure of P, put the pre...

Embodiment 3

[0013] Example 3: K 2 CO 3 :Al 2 o 3 : SiO 2 :B 2 o 3 According to K 6.15 B 0.07 Al 0.08 Si 1.85 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 300 rev / mins 30 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 20 minutes, and the ground powder is heated to 500°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 20 minutes, and the ground powder was heated to 800°C at a rate of 10°C / min in the air atmosphere and kept for 15 hours, then cooled with the furnace; after grinding, it was oxidized in 0.2M hydrogen After soaking in sodium solution for 10 minutes, filter, dry and place in a press at 5×10 7 Pressed into thin slices under the pressure of P, ...

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Abstract

The invention discloses a B<3+> and Al<3+> ion collaboratively doped K6Si2O7 potassium fast ion conductor and a preparation method thereof. The B<3+> and Al<3+> ion collaboratively doped K6Si2O7 potassium fast ion conductor is characterized in that the stoichiometric equation is K<6+x+y>B<x>Al<y>Si<2-x-y>O7, wherein x is within 0.05 to 0.10, and y is within 0.05 to 0.1; and the normal-temperaturepotassium ion conductivity exceeds 5*10<-4> S / cm. B<3+> and Al<3+> are adopted to partially replace Si<4+> ions, and interstitial potassium ions are generated in crystals to reduce migration activation energy of the potassium ions; the size of a migration channel of the potassium ions is adjusted through small-ion-radius B<3+> doping so as to adapt to rapid migration of the potassium ions; and inthe preparation process, the surfaces of K6Si2O7 particles are modified, and the easy-to-sinter characteristic is formed. Through the collaborative effect, the normal-temperature potassium ion conductivity of the potassium fast ion conductor exceeds 5*10<-4> S / cm and is 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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IPC IPC(8): C04B35/16C04B35/622H01M10/0562H01M10/054
CPCC04B35/16C04B35/622C04B2235/3217C04B2235/3409H01M10/054H01M10/0562H01M2300/0071Y02E60/10
Inventor 水淼舒杰任元龙
Owner NINGBO UNIV
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