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Electric field induced crystallization A1<3+> and Be<2+> doped K2MgSi5O12 potassium fast ion conductor and preparation method thereof

An electric field induction, ion conductor technology, applied in the direction of circuits, electrolytes, electrical components, etc., to reduce the activation energy of migration, speed up the speed, and reduce the effect of grain boundary voids

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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  • Electric field induced crystallization A1&lt;3+&gt; and Be&lt;2+&gt; doped K2MgSi5O12 potassium fast ion conductor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: the solid K 2 CO 3 :MgO:Al 2 o 3 : SiO 2 : BeO according to K 2.15 MgB 0.05 al 0.05 Si 4.89 o 12 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 120 rev / mins 10 hours, after ball mill finishes, in 60 ℃ of vacuum ovens (gas pressure in oven is at 5 Pa) for 3 hours, take it out and re-grind in an agate mortar for 12 minutes, the ground powder is heated to 550 ° C at a rate of 7 ° C / min in the air atmosphere and then cooled with the furnace for 3 hours; The powder was ground again in an agate mortar for 10 minutes, and the ground powder was heated up to 1250 °C at a rate of 5 °C / min in a platinum crucible in an air atmosphere and kept for 25 hours, then taken out of the furnace and cooled rapidly; the cooled The material was pulverized and ground for 30 minutes in the mill, soaked in 0.1 M sodium hydroxide solution for 5 mi...

Embodiment 2

[0012] Embodiment 2: the solid K 2 CO 3 :MgO:Al 2 o 3 : SiO 2 : BeO according to K 2.45 MgB 0.15 al 0.15 Si 4.7 o 12 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 400 rev / mins 40 hours, after ball mill finishes, in 110 ℃ of vacuum ovens (gas pressure in oven is at 20 Pa) for 10 hours, take it out and re-grind in an agate mortar for 30 minutes, heat up the ground powder at a rate of 30 °C / min to 600 °C for 10 hours in an air atmosphere, and then cool it with the furnace; The powder was ground again in an agate mortar for 30 minutes, and the ground powder was heated to 1330°C in a platinum crucible in an air atmosphere at a rate of 13°C / min and kept at 1330°C for 45 hours, then taken out of the furnace and cooled rapidly; the cooled The material was pulverized and ground for 50 minutes in the mill, soaked in 0.3M sodium hydroxide solution for ...

Embodiment 3

[0013] Embodiment 3: the solid K 2 CO 3 :MgO:Al 2 o 3 : SiO 2 : BeO according to K 2.3 MgB 0.1 al 0.1 Si 4.8 o 12 The ratio of the stoichiometric molar ratio is uniformly mixed, adding quality is the dehydrated alcohol of mixture quality 6%, in ball mill with the rotating speed ball mill of 300 rev / mins 30 hours, after ball mill finishes, in 100 ℃ of vacuum ovens (gas pressure in oven is at 15Pa) for 6 hours, take it out and re-grind in an agate mortar for 20 minutes, the ground powder is heated to 600°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 up to 1300°C in a platinum crucible in an air atmosphere at a rate of 10°C / min and kept at 1300°C for 35 hours, then taken out of the furnace and cooled rapidly; the cooled The material was pulverized and ground for 40 minutes in the mill, soaked in 0.2M sodium hydroxide solution for 10...

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Abstract

The invention discloses an electric field induced crystallization A1<3+> and Be<2+> doped K2MgSi5O12 potassium fast ion conductor and a preparation method thereof. The electric field induced crystallization A1<3+> and Be<2+> doped K2MgSi5O12 potassium fast ion conductor is characterized in that the stoichiometric equation is K<2+2x+y>MgBe<x>Al<y>Si<5-x-y>O12, wherein x is within 0.05 to 0.15, andy is within 0.05 to 0.15; and the normal-temperature potassium ion conductivity exceeds 5.10<-4> S / cm. A1<3+> and Be<2+> 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 Be<2+> doping so as toadapt to rapid migration of the potassium ions; and in the preparation process, the surfaces of K2MgSi5O12 particles are modified, and the easy-to-sinter characteristic is formed. Meanwhile, strong direct-current electric field induced crystallization is introduced to increase the crystallization speed, the crystallization temperature is decreased, and crystallization completeness is improved. 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): C04B35/20H01M10/0562H01M10/054
CPCC04B35/20C04B2235/3205C04B2235/3217C04B2235/3418C04B2235/442C04B2235/6562C04B2235/96H01M10/054H01M10/0562H01M2300/0071Y02E60/10
Inventor 水淼舒杰任元龙
Owner NINGBO UNIV
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