Liquid-phase synthesis multi-ion doped K2MgSi5O12 potassium fast ion conductor and preparation method thereof

A technology of ion doping and liquid phase synthesis, applied in electrical components, battery electrodes, circuits, etc., to reduce electronic conductivity and reduce grain boundary voids

Inactive Publication Date: 2019-10-15
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 multi-ion doped K2MgSi5O12 potassium fast ion conductor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: the solid KNO 3 : NH 4 h 2 PO 4 : Ca(NO 3 ) 2 2H 2 O:Ba(NO 3 ) 2 : Mg(NO 3 ) 2 ·6H 2 O according to K 2.24 MgCa 0.05 Ba 0.02 be 0.2 P 0.02 Ti 0.02 Si 4.76 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 1.1 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 2.24 MgCa 0.05 Ba 0.02 be 0.2 P 0.02 Ti 0.02 Si 4.76 o 12 The stoichiometric ratio, and the amount of tartaric acid added is 1.6 times the total amount of all metal ions and fully stirred until completely dissolved; record this solution as solution A; will meet K 2.24 MgCa 0.05 Ba 0.02 be 0.2...

Embodiment 2

[0012] Embodiment 2: the solid KNO 3 : NH 4 h 2 PO 4 : Ca(NO 3 ) 2 2H 2 O:Ba(NO 3 ) 2 : Mg(NO 3 ) 2 ·6H 2 O according to K 2.24 MgCa 0.05 Ba 0.02 be 0.2 P 0.02 Ti 0.02 Si 4.76 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 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 2.24 MgCa 0.05 Ba 0.02 be 0.2 P 0.02 Ti 0.02 Si 4.76 o 12 The stoichiometric ratio, and the amount of tartaric acid added is 2.3 times the total amount of all metal ions and fully stirred until completely dissolved; record this solution as solution A; will meet K 2.24 MgCa 0.05 Ba 0.02 be 0.2...

Embodiment 3

[0013] Embodiment 3: the solid KNO 3 : NH 4 h 2 PO 4 : Ca(NO 3 ) 2 2H 2 O:Ba(NO 3 ) 2 : Mg(NO 3 ) 2 ·6H 2 O according to K 2.24 MgCa 0.05 Ba 0.02 be 0.2 P 0.02 Ti 0.02 Si 4.76 o 12The 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 2.24 MgCa 0.05 Ba 0.02 be 0.2 P 0.02 Ti 0.02 Si 4.76 o 12 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 2.24 MgCa 0.05 Ba 0.02 be 0.2 ...

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Abstract

The invention relates to a liquid-phase synthesis multi-ion doped K2MgSi5O12 potassium fast ion conductor and a preparation method thereof. The liquid-phase synthesis multi-ion doped K2MgSi5O12 potassium fast ion conductor is characterized in that the stoichiometric formula is K2.24MgCa0.05Ba0.02Be0.2P0.02Ti0.02Si4.76O12; and the conductivity of potassium ions at room temperature is higher than 5*10<-4>S / cm. Be2+ partially replace Si4+ ions to produce interstitial potassium ions in a crystal, so as to reduce the activation energy of potassium ion migration. The size of the potassium ion migration channels is adjusted through doping of Be2+ with small ion radius in order to adapt to the rapid migration of potassium ions. A distorted lattice structure is formed through partial doping of Ti4+in order to increase lattice defects and facilitate potassium ion conduction. The electronic conductivity of the fast ionic conductor is further reduced through doping of P5+. Through partial dopingof Ca2+ and Ba2+, cation vacancies are formed to increase potassium ion migration paths. The surface of K2MgSi5O12 particles is modified in the preparation process to make the conductor easy to sinter. The synergistic effect makes the conductivity of potassium ions of the potassium fast ionic conductor exceed 5*10<-4>S / cm at room temperature, which is closer to the conductivity of potassium ions of 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): H01M4/36H01M4/485
CPCH01M4/364H01M4/485Y02E60/10
Inventor 水淼
Owner NINGBO UNIV
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