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Liquid-phase synthesis K<2.25>MgBe<0.1>Al<0.1>P<0.05>Ti<0.05>Si<4.7>O<12> potassium fast ion conductor and preparation method thereof

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

Active Publication Date: 2019-12-03
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 K&lt;2.25&gt;MgBe&lt;0.1&gt;Al&lt;0.1&gt;P&lt;0.05&gt;Ti&lt;0.05&gt;Si&lt;4.7&gt;O&lt;12&gt; 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 : Mg(NO 3 ) 2 ·6H 2 O according to K 2.25 MgB 0.1 Al 0.1 P 0.05 Ti 0.05 Si 4.7 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 1.0 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 2.25 MgB 0.1 Al 0.1 P 0.05 Ti 0.05 Si 4.7 o 12 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 2.25 MgB 0.1 Al 0.1 P 0.05 Ti 0.05 Si 4.7 o 12 Tetraethyl orthosi...

Embodiment 2

[0012] Embodiment 2: the solid KNO 3 : Al(NO 3 ) 3 9H 2 O: NH 4 h 2 PO 4 : Mg(NO 3 ) 2 ·6H 2 O according to K 2.25 MgB 0.1 Al 0.1 P 0.05 Ti 0.05 Si 4.7 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 2.25 MgB 0.1 Al 0.1 P 0.05 Ti 0.05 Si 4.7 o 12 The stoichiometric ratio, and the amount of tartaric acid added is 2.5 times the total amount of all metal ions and fully stirred until completely dissolved; record this solution as solution A; will meet K 2.25 MgB 0.1 Al 0.1 P 0.05 Ti 0.05 Si 4.7 o 12 Tetraethyl orthosi...

Embodiment 3

[0013] Embodiment 3: the solid KNO 3 : Al(NO 3 ) 3 9H 2 O: NH 4 h 2 PO 4 : Mg(NO 3 ) 2 ·6H 2 O according to K 2.25 MgB 0.1 Al 0.1 P 0.05 Ti 0.05 Si 4.7 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 1.2 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 2.25 MgB 0.1 Al 0.1 P 0.05 Ti 0.05 Si 4.7 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 2.25 MgB 0.1 Al 0.1 P 0.05 Ti 0.05 Si 4.7 o 12Tetraethyl orthosil...

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Abstract

The invention discloses a liquid-phase synthesis K<2.25>MgBe<0.1>Al<0.1>P<0.05>Ti<0.05>Si<4.7>O<12> potassium fast ion conductor and a preparation method thereof. The liquid-phase synthesis K<2.25>MgBe<0.1>Al<0.1>P<0.05>Ti<0.05>Si<4.7>O<12> potassium fast ion conductor is characterized in that electrical conductivity of a potassium ion is greater than 5*10<-4>S / cm at room temperature; Al<3+> and Be<2+> are used for partially replacing Si<4+> ions, and interstitial potassium ions are generated in a crystal to reduce the activation energy of potassium ion migration; the electronic conductivity of the fast ion conductor is further reduced through P<5+> doping; the size of a migration channel of the potassium ion is adjusted through doping of Be<2+> with a small ion radius so as to adapt to the rapid migration of the potassium ions; a distorted lattice structure is formed through Ti<4+> partial doping to increase the lattice defect to facilitate potassium ion conduction; and during the preparation process, the surfaces of K2MgSi5O12 particles are modified to form an easy-to-sinter characteristic. According to the synergistic effects, the electrical conductivity of the potassium ions atthe room temperature of the potassium fast ion conductor is greater than 5*10<-4>S / cm and closer to the electrical conductivity of the 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): C04B35/20H01M10/0562H01M10/054
CPCC04B35/20C04B2235/443C04B2235/447C04B2235/48C04B2235/6562C04B2235/96H01M10/054H01M10/0562H01M2300/0071Y02E60/10
Inventor 水淼舒杰任元龙
Owner NINGBO UNIV
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