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K6Si2O7 potassium fast ion conductor co-doped with P5+, Al3+, Be2+ and Zn2+ ions and preparation method thereof

An ion conductor, ion technology, applied in electrical components, battery electrodes, circuits, etc., to achieve the effect of reducing grain boundary voids

Inactive Publication Date: 2019-10-15
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 co-doped with P5+, Al3+, Be2+ and Zn2+ ions and preparation method thereof

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:ZnO according to K 6.24 be 0.1 Al 0.1 P 0.02 Zn 0.02 Si 1.7 8 o 7 The ratio of the stoichiometric molar ratio is uniformly mixed and added with a quality of 3% dehydrated alcohol of the mixture quality, ball milled for 11 hours at a speed of 200 rev / min in a ball mill, and after the ball mill finishes, in a vacuum oven at 60°C (the gas pressure in the oven is at 3Pa ) for 3 hours, took it out and re-grinded it in an agate mortar for 12 minutes, and the ground powder was heated to 450°C at a rate of 5°C / min in an air atmosphere and then cooled with the furnace after being kept for 3 hours; the cooled powder The powder is ground again in an agate mortar for 10 minutes, and the ground powder is heated to 660 °C at a rate of 6 °C / min in an air atmosphere for 10 hours and then cooled with the furnace; After soaking in the solution for 5 minutes, filter, dry and press in a 1.2×10 7 Pressed into thin s...

Embodiment 2

[0012] Example 2: K 2 CO 3 : NH 4 h 2 PO 4 : Al 2 o 3 : SiO 2 :BeO:ZnO according to K 6.45 be 0.2 Al 0.2 P 0.05 Zn 0.05 Si 1.5 5 o 7 The ratio of the stoichiometric molar ratio is evenly mixed, adding quality is the dehydrated alcohol of mixture quality 8%, in ball mill with the rotating speed ball mill of 400 rev / mins 45 hours, after ball mill finishes, in 110 ℃ of vacuum ovens (gas pressure in oven is at 20Pa) for 10 hours, take it out and re-grind in an agate mortar for 30 minutes, the ground powder is heated up 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 28 minutes, and the ground powder was heated to 750 °C at a rate of 15 °C / min in the air atmosphere for 20 hours and then cooled with the furnace; after grinding, it was oxidized in 0.3M hydrogen After soaking in sodium solution for 15 minutes, filter, dry and press in a 7×10 7 Pressed into thin slices ...

Embodiment 3

[0013] Example 3: K 2 CO 3 : NH 4 h 2 PO 4 : Al 2 o 3 : SiO 2 :BeO:ZnO according to K 6.36 be 0.15 Al 0.15 P 0.03 Zn 0.03 Si 1.67 o 7 The ratio of the stoichiometric molar ratio is uniformly mixed, adding quality is the dehydrated alcohol of mixture quality 5%, in ball mill with the rotating speed ball mill of 300 rev / mins 40 hours, after ball mill finishes, in 90 ℃ of vacuum ovens (gas pressure in the oven is at 18Pa) for 8 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 25°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 700°C at a rate of 10°C / min in an 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 ...

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Abstract

A K6Si2O7 potassium fast ion conductor co-doped with P5+, Al3+, Be2+ and Zn2+ ions and a preparation method thereof are provided. The K6Si2O7 potassium fast ion conductor is characterized in that thestoichiometric formula is K<6+2*x+y-z-2*m>Be<x>Al<y>P<z>Zn<m>Si<2-x-y-z>O<7>, wherein x is equal to 0.1-0.2, y is equal to 0.1-0.2, z is equal to 0.02-0.05, and m is equal to 0.02-0.05; and the conductivity of potassium ions at room temperature is higher than 5*10<-4>S / cm. Al3+ and Be2+ partially replace Si4+ ions to produce interstitial potassium ions in a crystal, so as to reduce the activationenergy of potassium ion migration. The electronic conductivity of the fast ionic conductor is further reduced through doping of P5+. The size of the potassium ion migration channels is adjusted through doping of Be2+ with small ion radius in order to adapt to the rapid migration of potassium ions. Zn2+ partially replaces potassium ions to cause cation vacancies, so as to increase the number of potassium ion migration channels. The surface of K6Si2O7 particles is modified in the preparation process to make the conductor easy to sinter. The synergistic effect makes the conductivity of potassiumions of the potassium fast ionic conductor exceed 5*10<-4>S / cm at room temperature, which is closer to the conductivity of potassium ions of 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): H01M4/36H01M4/485
CPCH01M4/364H01M4/485Y02E60/10
Inventor 水淼舒杰任元龙
Owner NINGBO UNIV
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