Electric field induced crystallization K<6.25>Be<0.1>Al<0.1>P<0.05>Zr<0.05>Si<1.7>O<7> potassium fast ion conductor and preparation method thereof

An ion conductor and electric field induction technology, applied in chemical instruments and methods, circuits, electrolytes, etc., to achieve the effect of improving crystallization integrity, reducing grain boundary gaps, and accelerating crystallization speed

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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  • Electric field induced crystallization K&lt;6.25&gt;Be&lt;0.1&gt;Al&lt;0.1&gt;P&lt;0.05&gt;Zr&lt;0.05&gt;Si&lt;1.7&gt;O&lt;7&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 According to K 6.25 be 0.1 Al 0.1 P 0.05 Zr 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 1.1 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 6.25 be 0.1 Al 0.1 P 0.05 Zr 0.05 Si 1.7 o 7 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 6.25 be 0.1 Al 0. 1 P 0.05 Zr 0.05 Si 1.7 o 7 Tetraethyl orthosilicate and tetrabutyl zircona...

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 Zr 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 Zr 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 Zr 0.05 Si 1.7 o 7 Tetraethyl orthosilicate and tetrabutyl zircona...

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 Zr 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 1.3 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 be 0.1 Al 0.1 P 0.05 Zr 0.05 Si 1.7 o 7 The stoichiometric ratio, and the amount of tartaric acid added is 2.1 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 Zr 0.05 Si 1.7 o 7Tetraethyl orthosilicate and tetrabutyl zirconat...

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Abstract

The invention discloses an electric field induced crystallization K<6.25>Be<0.1>Al<0.1>P<0.05>Zr<0.05>Si<1.7>O<7> potassium fast ion conductor and a preparation method thereof. Al<3+> and Be<2+> are used for partially substituting Si<4+> ions, high-concentration interstitial potassium ions are generated in a crystal, and the reduction of migration activation energy of the potassium ions is facilitated; the electron conductivity of the fast ion conductor is further reduced by doping P<5+>; the size of migration channels of the potassium ions is adjusted by doping Be<2+> with a small ionic radius to adapt to the rapid migration of the potassium ions; Zr<4+> is partially doped to form a distorted lattice structure to increase the lattice imperfectio to facilitate potassium ion conduction; andthe surface of K6Si2O7 particles is modified in the preparation process to form an easy-sintering property. Meanwhile, the introduction of a strong direct current electric field induces crystallization to accelerate the crystallization rate, lower the crystallization temperature and increase the crystal integrity. The synergistic effects enable the normal temperature potassium ion conductivity ofthe potassium fast ion conductor to exceed 5*10<-4> S / cm and to be 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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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/00H01M10/0562
CPCC01B33/00C01P2002/72H01M10/054H01M10/0562H01M2300/0071Y02E60/10
Inventor 水淼
Owner NINGBO UNIV
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