A liquid phase synthesis k 2.25 mgbe 0.1 al 0.1 p 0.05 ti 0.05 the si 4.7 o 12 Potassium fast ion conductor and preparation method thereof

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

Active Publication Date: 2021-12-07
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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  • A liquid phase synthesis k <sub>2.25</sub> mgbe <sub>0.1</sub> al <sub>0.1</sub> p <sub>0.05</sub> ti <sub>0.05</sub> the si <sub>4.7</sub> o <sub>12</sub> 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 OFollow 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 orthosilicate ...

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 OFollow 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 orthosilicate ...

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 OFollow 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 orthosilicate a...

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Abstract

A liquid-phase synthetic K 2.25 MgB 0.1 Al 0.1 P 0.05 Ti 0.05 Si 4.7 o 12 Potassium fast ion conductor and preparation method thereof, characterized in that: normal temperature potassium ion conductivity exceeds 5.10 ‑4 S / cm. Using Al 3+ 、Be 2+ Partial replacement of Si 4+ Ions, generate interstitial potassium ions in the crystal and reduce the activation energy of potassium ion migration; through P 5+ Doping further reduces the electronic conductivity of fast ion conductors; through the small ionic radius Be 2+ Doping adjusts the size of the migration channel of potassium ions to adapt to the rapid migration of potassium ions; through Ti 4+ Partial doping forms a distorted lattice structure to increase lattice defects, which is conducive to the conduction of potassium ions; and during the preparation process at K 2 MgSi 5 o 12 The surface of the particles is modified to form easy sintering properties. These synergistic effects make the normal temperature potassium ion conductivity of this potassium fast ion conductor exceed 5·10 ‑4 S / cm, which is closer to the potassium ion conductivity of the 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 Patents(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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