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Liquid-phase-synthesized K6.25Fe0.05Mg0.05Be0.2Al0.1Ti0.02Si1.68O7 potassium fast ion conductor and preparation method thereof

An ionic conductor, liquid phase synthesis technology, used in electrochemical generators, electrical components, circuits, etc., to reduce grain boundary voids and reduce migration activation energy.

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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  • Liquid-phase-synthesized K6.25Fe0.05Mg0.05Be0.2Al0.1Ti0.02Si1.68O7 potassium fast ion conductor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: the solid KNO 3 : Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O:Mg(NO 3 ) 3 ·6H 2 O according to K 6.25 Fe 0.05 Mg 0.05 be 0.2 Al 0.1 Ti 0.02 Si 1.68 o 7 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 1.0 times the quality of deionized water and stir evenly, then continue to stir and add 35wt% beryllium nitrate aqueous solution until the amount of beryllium in the solution system meets K 6.25 Fe 0.05 Mg 0.05 be 0.2 Al 0.1 Ti 0.02 Si 1.6 8 o 7 The stoichiometric ratio, and the amount of tartaric acid added is 1.7 times the total amount of all metal ions and fully stirred until completely dissolved; record this solution as solution A; will meet K 6.25 Fe 0.05 Mg 0.05 be 0.2 Al 0.1 Ti 0.02 S...

Embodiment 2

[0012] Embodiment 2: the solid KNO 3 : Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O:Mg(NO 3 ) 3 ·6H 2 O according to K 6.25 Fe 0.05 Mg 0.05 be 0.2 Al 0.1 Ti 0.02 Si 1.68 o 7 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 1.5 times the quality of deionized water and stir evenly, then continue to stir and add 35wt% beryllium nitrate aqueous solution until the amount of beryllium in the solution system meets K 6.25 Fe 0.05 Mg 0.05 be 0.2 Al 0.1 Ti 0.02 Si 1.6 8 o 7 The stoichiometric ratio, and the amount of tartaric acid added is 2.4 times the total amount of all metal ions and fully stirred until completely dissolved; record this solution as solution A: will meet K 6.25 Fe 0.05 Mg 0.05 be 0.2 Al 0.1 Ti 0.02 S...

Embodiment 3

[0013] Embodiment 3: the solid KNO 3 : Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O:Mg(NO 3 ) 3 ·6H 2 O according to K 6.25 Fe 0.05 Mg 0.05 be 0.2 Al 0.1 Ti 0.02 Si 1.68 o 7 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 1.3 times the quality of deionized water and stir evenly, then continue to stir and add 35wt% beryllium nitrate aqueous solution until the amount of beryllium in the solution system meets K 6.25 Fe 0.05 Mg 0.05 be 0.2 Al 0.1 Ti 0.02 Si 1.6 8 o 7 The stoichiometric ratio, and the amount of tartaric acid added is 2.2 times the total amount of all metal ions and fully stirred until completely dissolved; record this solution as solution A; will meet K 6.25 be 0.1 Al 0.1 P0.05 Ti 0.05 Si 1.7 o 7 ...

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Abstract

The invention relates to a liquid-phase-synthesized K6.25Fe0.05Mg0.05Be0.2Al0.1Ti0.02Si1.68O7 potassium fast ion conductor and a preparation method thereof. The method is characterized in that Al<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 potassium ions; the size of a migration channel of potassium ions is adjusted by doping Be<2+> with a small ion radius to adapt to rapid migration of potassium ions; a distorted lattice structure is formed through Ti <4+> partial doping to increase lattice defects to facilitate potassium ion conduction; cation vacancy is formed through partial doping of Fe<3+> and Mg<2+> to increase a migration path of potassium ions; and in the preparationprocess, modification is performed on the surfaces of K6Si2O7 particles to form characteristic of easy sintering. Due to the above synergistic 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): C04B35/19C04B35/622C04B35/624H01M10/0562
CPCC04B35/19C04B35/622C04B35/624C04B2235/3205C04B2235/3206C04B2235/3217C04B2235/3232C04B2235/3272C04B2235/602C04B2235/6562C04B2235/6567H01M10/054H01M10/0562H01M2300/0071Y02E60/10
Inventor 水淼
Owner NINGBO UNIV
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