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Liquid-phase synthesis K2.15MgFe0.05Cu0.05Al0.2B0.2Ti0.02Si4.58O12 potassium fast ion conductor and preparation method

An ionic conductor, liquid phase synthesis technology, applied in chemical instruments and methods, boron compounds, boron oxide compounds, etc., to achieve the effect of reducing grain boundary voids 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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  • Liquid-phase synthesis K2.15MgFe0.05Cu0.05Al0.2B0.2Ti0.02Si4.58O12 potassium fast ion conductor and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: the solid KNO 3 : Fe(NO 3 ) 3 9H 2 O: Cu(NO 3 ) 2 ·3H 2 O: boric acid: Al(NO 3 ) 3 9H 2 O:Mg(NO 3 ) 2 ·6H 2 O according to K 2.15 MgFe 0.05 Cu 0.05 Al 0.2 B 0.2 Ti 0.02 Si 4.58 o 12 The ratio of the stoichiometric molar ratio of the corresponding elements in the mixture is uniformly mixed, while vigorously stirring, add deionized water until all solid substances are dissolved, record the mass of the added deionized water, and then continue to add the recorded deionized water Deionized water with a mass of 1.0 times the mass and stirred evenly, then continue to stir and add tartaric acid whose amount is 1.6 times the total amount of all metal ions and stir well until completely dissolved; record this solution as solution A; it will meet K 2.15 MgFe 0.05 Cu 0.05 al 0.2 B 0.2 Ti 0.02 Si 4.58 o 12 Tetraethyl orthosilicate and tetrabutyl titanate of the stoichiometric ratio are dissolved in absolute ethanol whose volume is 1.1 times th...

Embodiment 2

[0012] Embodiment 2: the solid KNO 3 : Fe(NO 3 ) 3 9H 2 O: Cu(NO 3 ) 2 ·3H 2 O: boric acid: Al(NO 3 ) 3 9H 2 O:Mg(NO 3 ) 2 ·6H 2 O according to K 2.15 Fe 0.05 MgCu 0.05 Al 0.2 B 0.2 Ti 0.02 Si 4.58 o 12 The ratio of the stoichiometric molar ratio of the corresponding elements in the mixture is uniformly mixed, while vigorously stirring, add deionized water until all solid substances are dissolved, record the mass of the added deionized water, and then continue to add the recorded deionized water Deionized water with a mass of 1.5 times the mass and stirred evenly, then continue to stir and add tartaric acid whose amount is 2.4 times the total amount of all metal ions and stir well until completely dissolved; record this solution as solution A; it will meet K 2.15 MgFe 0.05 Cu 0.05 Al 0.2 B 0.2 Ti 0.02 Si 4.58 o 12 Tetraethyl orthosilicate and tetrabutyl titanate of the stoichiometric ratio are dissolved in absolute ethanol whose volume is 1.4 times th...

Embodiment 3

[0013] Embodiment 3: the solid KNO 3 : Fe(NO 3 ) 3 9H 2 O: Cu(NO 3 ) 2 ·3H 2 O: boric acid: Al(NO 3 ) 3 9H 2 O:Mg(NO 3 ) 2 ·6H 2 O according to K 2.15 MgFe 0.05 Cu 0.05 Al 0.2 B 0.2 Ti 0.02 Si 4.58 o 12 The ratio of the stoichiometric molar ratio of the corresponding elements in the mixture is uniformly mixed, while vigorously stirring, add deionized water until all solid substances are dissolved, record the mass of the added deionized water, and then continue to add the recorded deionized water Deionized water with a mass of 1.2 times the mass and stirred evenly, then continue to stir and add tartaric acid whose amount is 2.2 times the total amount of all metal ions and stir well until completely dissolved; record this solution as solution A; it will meet K 2.15 MgFe 0.05 Cu 0.05 Al 0.2 B 0.2 Ti 0.02 Si 4.58 o 12Tetraethyl orthosilicate and tetrabutyl titanate of the stoichiometric ratio are dissolved in absolute ethanol whose volume is 1.3 times the...

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Abstract

The invention discloses a liquid-phase synthesis K2.15MgFe0.05Cu0.05Al0.2B0.2Ti0.02Si4.58O12 potassium fast ion conductor and a preparation method. The conductor is characterized in that the normal-temperature potassium ion conductivity is greater than 5*10<-4>S / cm. Si<4+> ions are partially substituted by B<3+> and Al<3+>, interval potassium ions are generated in a crystal, and thus the migrationactivation energy of the potassium ions can be degraded; through B<3+> doping of a small ion radius, the size of a migration channel of the potassium ions can be adjusted to be adaptive to rapid migration of the potassium ions; due to partial doping of Ti<4+>, a distorted lattice structure is formed, then lattice defects are increased, and potassium ion conductivity can be facilitated; due to partial doping of Cu<2+> and Fe<3+>, cation vacancies are formed, and thus migration paths of the potassium ions can be increased; and in addition, in the preparation process, modification is implementedon surfaces of K2MgSi5O12 granules, so that an easy sintering property is achieved. Due to the synergetic effects, the normal-temperature potassium ion conductivity of the potassium fast ion conductor is greater than 5*10<-4>S / cm, which is approximate to 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): C01B35/10C01B35/12H01M10/0562
CPCC01B35/10C01B35/128H01M10/054H01M10/0562H01M2300/0071Y02E60/10
Inventor 水淼
Owner NINGBO UNIV
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