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Liquid-phase synthesized K6.25Be0.1Al0.1P0.05Ti0.05Si1.7O7 potassium fast ion conductor and preparation method thereof

A technology of ion conductor and liquid phase synthesis, applied in electrochemical generators, electrical components, circuits, etc., to increase lattice defects, facilitate potassium ion conduction, and reduce grain boundary voids

Active Publication Date: 2019-12-03
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 K6.25Be0.1Al0.1P0.05Ti0.05Si1.7O7 potassium fast ion conductor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: the solid KNO 3 : Al(NO 3 ) 3 9H 2 O: NH 4 h 2 PO 4 According to K 6.25 be 0.1 Al 0.1 P 0.05 Ti 0.05 Si 1.7 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 be 0.1 Al 0.1 P 0.05 Ti 0.05 Si 1.7 o 7 The stoichiometric ratio, and the amount of tartaric acid added is 1.5 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 P 0.05 Ti 0.05 Si 1.7 o 7 Tetraethyl orthosilicate and tetrabutyl titanat...

Embodiment 2

[0012] Embodiment 2: the solid KNO 3 : Al(NO 3 ) 3 9H 2 O: NH 4 h 2 PO 4 According to K 6.25 be 0.1 Al 0.1 P 0.05 Ti 0.05 Si 1.7 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 be 0.1 Al 0.1 P 0.05 Ti 0.05 Si 1.7 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 be 0.1 Al 0. 1 P 0.05 Ti 0.05 Si 1.7 o 7 Tetraethyl orthosilicate and tetrabutyl titanat...

Embodiment 3

[0013] Embodiment 3: the solid KNO 3 : Al(NO 3 ) 3 9H 2 O: NH 4 h 2 PO 4 According to K 6.25 be 0.1 Al 0.1 P 0.05 Ti 0.05 Si 1.7 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 1.2 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 be 0.1 Al 0.1 P 0.05 Ti 0.05 Si 1.7 o 7 The stoichiometric ratio, and the amount of tartaric acid added is 2.0 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 P 0.05 Ti 0.05 Si 1.7 o 7Tetraethyl orthosilicate and tetrabutyl titanate...

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Abstract

The invention relates to a liquid-phase synthesized K6.25Be0.1Al0.1P0.05Ti0.05Si1.7O7 potassium fast ion conductor and a preparation method thereof. The liquid-phase synthesized K6.25Be0.1Al0.1P0.05Ti0.05Si1.7O7 potassium fast ion conductor has the characteristics that Al<3+> and Be<2+> are used for partially replacing Si<4+> ions, interstitial potassium ions are produced in a crystal, and migration activation energy of potassium ions is lowered; the electronic conductivity of the fast ion conductor is further lowered by doping P<5+>; the size of a potassium migration channel is adjusted by doping the Be<2+> with small ion radius to adapt to rapid migration of the potassium ions; the distorted lattice structure is formed by partially doping Ti<4+>, lattice imperfection is increased, and potassium ion conduction is facilitated; and in the preparation process, the surfaces of K6Si2O7 particles are modified to form the easy-sintering property. According to the synergistic effects, the room-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): C04B35/16H01M10/0562
CPCC04B35/16C04B2235/3201C04B2235/3205C04B2235/3217C04B2235/3232C04B2235/447H01M10/054H01M10/0562Y02E60/10
Inventor 水淼舒杰任元龙
Owner NINGBO UNIV
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