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P<5+> and Al<3+> ion collaboratively doped K6Si2O7 potassium fast ion conductor and preparation method thereof

An ion conductor and ion technology, which is applied in the field of solid potassium fast ion conductor manufacturing to achieve the effects of reducing migration activation energy, reducing grain boundary voids and improving potassium ion conductivity

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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  • P&lt;5+&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: Put K 2 CO 3 : Al 2 O 3 : SiO 2 : NH 4 H 2 PO 4 : Follow K 6.08 P 0.02 Al 0.1 Si 1.88 O 7 The stoichiometric molar ratio of the mixture is uniformly mixed, and anhydrous ethanol with a mass of 4% by mass of the mixture is added. The ball mill is ball milled in a ball mill at a speed of 120 revolutions / min for 15 hours. After the ball milling is completed, a vacuum oven at 70°C (the gas pressure in the oven is at 5Pa) dry for 2 hours, take it out and re-grind it in an agate mill for 10 minutes. The ground powder is heated to 460°C at a rate of 7°C / min in an air atmosphere and kept at 460°C for 3 hours and then cooled in the furnace; after cooling Grind the powder in the agate grinding bowl for another 10 minutes. The ground powder is heated to 750°C at a rate of 5°C / min in an air atmosphere and kept for 10 hours and then cooled in the furnace; Soaked in the sodium solution for 5 minutes, filtered, dried and placed in a press in a 1×10 7 Pressed into slices under...

Embodiment 2

[0012] Example 2: Put K 2 CO 3 : Al 2 O 3 : SiO 2 : NH 4 H 2 PO 4 : Follow K 6.15 P 0.05 Al 0.2 Si 1.75 O 7 The stoichiometric molar ratio of the mixture is uniformly mixed, and anhydrous ethanol with a mass of 9% by mass of the mixture is added, and the ball mill is ball milled at a speed of 500 rpm for 40 hours in a ball mill. After the ball milling is completed, a vacuum oven at 110°C (the gas pressure in the oven is at 20Pa) dry for 9 hours, take it out and re-grind in an agate mill for 30 minutes. The ground powder is heated to 550°C at a rate of 20°C / min in an air atmosphere and kept at 550°C for 8 hours and then cooled in the furnace; after cooling The powder is ground again in an agate mill for 30 minutes. The ground powder is heated to 845°C for 19 hours at a rate of 15°C / min in an air atmosphere and then cooled in the furnace; Soaked in the sodium solution for 12 minutes, filtered, dried and placed in a press in a 7×10 7 Pressed into slices under Pa pressure, put the p...

Embodiment 3

[0013] Example 3: Put K 2 CO 3 : Al 2 O 3 : SiO 2 : NH 4 H 2 PO 4 : Follow K 6.12 P 0.03 Al 0.15 Si 1.82 O 7 The stoichiometric molar ratio of the mixture is uniformly mixed, and anhydrous ethanol with a mass of 5% by mass of the mixture is added, and ball milled in a ball mill at a speed of 300 rpm for 30 hours. After the ball milling is completed, in a vacuum oven at 80°C (the gas pressure in the oven is at 15Pa) dry for 7 hours, take it out and re-grind in an agate mill for 20 minutes. The ground powder is heated to 500°C at a rate of 15°C / min in an air atmosphere and kept at 500°C for 5 hours and then cooled in the furnace; after cooling The powder is ground again in an agate mill for 20 minutes. The ground powder is heated to 800°C for 15 hours at a rate of 10°C / min in an air atmosphere, and then cooled in the furnace; Soaked in the sodium solution for 10 minutes, filtered, dried and placed in a press in a 5×10 7 Pressed into slices under the pressure of Pa, put the prepare...

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Abstract

The invention discloses a P<5+> and Al<3+> ion collaboratively doped K6Si2O7 potassium fast ion conductor and a preparation method thereof. The P<5+> and Al<3+> ion collaboratively doped K6Si2O7 potassium fast ion conductor is characterized in that the stoichiometric equation is K<6-x+y>P<x>Al<y>Si<2-x-y>O7, wherein x is within 0.02 to 0.05, and y is within 0.1 to 0.2; and the normal-temperature potassium ion conductivity exceeds 4*10<-4> S / cm. Al<3+> is adopted to partially replace Si<4+> ions, and interstitial potassium ions are generated in crystals to reduce migration activation energy ofthe potassium ions; the electronic conductivity of the fast ion conductor is further lowered through P<5+> doping; and in the 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 4*10<-4> S / cm and is closerto the potassium ion conductivity of a liquid electrolyte.

Description

Technical field [0001] The invention relates to the manufacturing field of a solid potassium fast ion conductor. Background technique [0002] Lithium-ion batteries have absolute advantages such as volume, high weight-to-energy ratio, high voltage, low self-discharge rate, no memory effect, long cycle life, and high power density. They have more than 30 billion US dollars / year share in the global mobile power market and far exceed others. The market share of batteries is the most promising chemical power source [Wu Yuping, Wan Chunrong, Jiang Changyin, Lithium Ion Secondary Battery, Beijing: Chemical Industry Press, 2002.]. At present, most lithium-ion secondary batteries at home and abroad use liquid electrolytes. Liquid lithium-ion batteries have some disadvantages. For example, liquid organic electrolytes may leak and explode at excessively high temperatures, causing safety accidents. They cannot be used in some Where safety requirements are high; liquid electrolyte lithium-i...

Claims

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Application Information

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IPC IPC(8): C04B35/16C04B35/622H01M10/0562H01M10/054
CPCC04B35/16C04B35/622C04B2235/3201C04B2235/3217C04B2235/447C04B2235/6562C04B2235/6567C04B2235/6583H01M10/054H01M10/0562H01M2300/0071Y02E60/10
Inventor 水淼舒杰任元龙
Owner NINGBO UNIV
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