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P5+, Al3+ and B3+ ions co-doped K6Si2O7 potassium fast ion conductor and preparation method thereof

A technology of ionic conductors and ions, which is applied in the fields of final product manufacturing, sustainable manufacturing/processing, and electrolyte battery manufacturing, etc., to achieve the effect of reducing migration activation energy and reducing grain boundary voids

Inactive Publication Date: 2019-10-18
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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  • P5+, Al3+ and B3+ ions co-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 : NH 4 h 2 PO 4 : Al 2 o 3 : SiO 2 :B 2 o 3 According to K 6.08 B 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 4.5%, in ball mill with the rotating speed ball mill of 110 rev / mins 16 hours, after ball mill finishes, in 65 ℃ of vacuum ovens (gas pressure in 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 Pressed into thin slice...

Embodiment 2

[0012] Example 2: K 2 CO 3 : NH 4 h 2 PO 4 : Al 2 o 3 : SiO 2 :B 2 o 3 According to K 6.13 B 0.09 Al 0.09 P 0.05 Si 1.77 o 7 The ratio of the stoichiometric molar ratio is evenly mixed, adding quality is the dehydrated alcohol of mixture quality 9%, in ball mill with the rotating speed ball mill of 450 rev / mins 45 hours, in 110 ℃ of vacuum ovens (gas pressure in the oven is in the oven after ball milling finishes) 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 Pressed into thin sli...

Embodiment 3

[0013] Example 3: K 2 CO 3 : NH 4 h 2 PO 4 : Al 2 o 3 : SiO 2 :B 2 o 3 According to K 6.12 B 0.07 Al 0.08 P 0.03 Si 1.82 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 Press it into thin sli...

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Abstract

The invention relates to a P5+, Al3+ and B3+ ions co-doped K6Si2O7 potassium fast ion conductor and a preparation method thereof. The conductor is characterized in that a stoichiometric formula is K6+x+y-zBxAlyPzSi2-x-y-zO7, wherein x = 0.05~0.10, y = 0.05~0.10, z = 0.02~0.05, and normal temperature potassium ion conductivity exceeds 5*10<-4>S / cm. The conductor is advantaged in that Si4+ ions arepartially replaced with Al3+ and B3+, and interstitial potassium ions are generated in a crystal to reduce potassium ion migration activation energy; electronic conductivity of the fast ion conductoris further reduced by P5+ doping; the size of a migration channel of potassium ions is adjusted by doping of B3+ with a small ionic radius to adapt to rapid migration of the potassium ions; in the preparation process, a surface of the K6Si2O7 particles is modified to form easy-sintering property; the synergistic effect makes potassium ion conductivity of the potassium fast ion conductor exceed 5*10<-4>S / cm, which is closer to the potassium ion conductivity of the 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): H01M10/058H01M10/0562
CPCH01M10/0562H01M10/058H01M2300/0091Y02E60/10Y02P70/50
Inventor 水淼舒杰任元龙
Owner NINGBO UNIV
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