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Electric field induced crystallization K2.23MgBe0.15P0.07Ti0.03Si4.75O12 potassium fast ion conductor and preparation method thereof

An ionic conductor and electric field-induced technology, applied in circuits, electrolytes, electrical components, etc., to achieve the effect of facilitating potassium ion conduction, reducing migration activation energy, and reducing the temperature of crystallization

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 K2.23MgBe0.15P0.07Ti0.03Si4.75O12 potassium fast ion conductor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: the solid K 2 CO 3 : NH 4 h 2 PO 4 : Mg(NO 3 ) 2 ·6H 2 O according to K 2.23 MgB 0.15 P 0.07 Ti 0.03 Si 4.7 5 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 2.23 MgB 0.15 P 0.07 Ti 0.03 Si 4.75 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 2.23 MgB 0.15 P 0.07 Ti 0.03 Si 4.75 o 12 Tetraethyl orthosilicate and tetrabutyl titanate of s...

Embodiment 2

[0012] Embodiment 2: the solid K 2 CO 3 : NH 4 h 2 PO 4 : Mg(NO 3 ) 2 ·6H 2 O according to K 2.23 MgB 0.15 P 0.07 Ti 0.03 Si 4.7 5 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 2.23 MgB 0.15 P 0.07 Ti 0.03 Si 4.75 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 2.23 MgB 0.15 P 0.07 Ti 0.03 Si 4.75 o 12 Tetraethyl orthosilicate and tetrabutyl titanate of t...

Embodiment 3

[0013] Embodiment 3: the solid K 2 CO 3 : NH 4 h 2 PO 4 : Mg(NO 3 ) 2 ·6H 2 O according to K 2.23 MgB 0.15 P 0.07 Ti 0.03 Si 4.7 5 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 2.23 MgB 0.15 P 0.07 Ti 0.03 Si 4.75 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 2.23 MgB 0.15 P 0.07 Ti 0.03 Si 4.75 o 12Tetraethyl orthosilicate and tetrabutyl titanate of th...

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Abstract

The invention discloses an electric field induced crystallization K2.23MgBe0.15P0.07Ti0.03Si4.75O12 potassium fast ion conductor and a preparation method thereof. The electric field induced crystallization K2.23MgBe0.15P0.07Ti0.03Si4.75O12 potassium fast ion conductor is characterized in that Be<2+> is adopted to partially replace Si<4+> ions, high-concentration interstitial potassium ions are generated in crystals, thus the close-range multiple potassium ions are collaboratively migrated, and migration activation energy of the potassium ions is reduced advantageously; the electronic conductivity of the fast ion conductor is further lowered through P<5+> doping; the size of a migration channel of the potassium ions is adjusted through small-ion-radius Be<2+> doping so as to adapt to rapidmigration of the potassium ions; through Ti<4+> partial doping, distorted lattice structures are formed to increase lattice defects, and thus potassium ion conduction is facilitated; and in the preparation process, the surfaces of K2MgSi5O12 particles are modified, and the easy-to-sinter characteristic is formed. Meanwhile, strong direct-current electric field induced crystallization is introducedto increase the crystallization speed, the crystallization temperature is decreased, and crystallization completeness is improved. Through the collaborative 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): C04B35/20C04B35/622H01M10/0562H01M10/054
CPCC04B35/20C04B35/622C04B2235/3201C04B2235/3205C04B2235/3232C04B2235/447C04B2235/6562C04B2235/6567C04B2235/6583H01M10/054H01M10/0562H01M2300/0071Y02E60/10
Inventor 水淼
Owner NINGBO UNIV
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