Liquid phase synthesis K<6.4>Fe<0.05>Cu<0.05>Be<0.2>Al<0.1>B<0.15>Ti<0.02>Si<1.53>O<7> potassium fast ion conductor and preparation method thereof

A liquid phase synthesis, ion fast conductor technology, applied in electrochemical generators, electrical components, circuits, etc., to reduce activation energy, reduce grain boundary voids, and increase migration paths.

Inactive Publication Date: 2019-10-22
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;6.4&gt;Fe&lt;0.05&gt;Cu&lt;0.05&gt;Be&lt;0.2&gt;Al&lt;0.1&gt;B&lt;0.15&gt;Ti&lt;0.02&gt;Si&lt;1.53&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 : Fe(NO 3 ) 3 9H 2 O: boric acid: Al(NO 3 ) 3 9H 2 O: Cu(NO 3 ) 3 ·3H 2 O according to K 6.4 Fe 0.05 Cu 0.05 be 0.2 Al 0.1 B 0.15 Ti 0.02 Si 1.53 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 6.4 Fe 0.05 Cu 0.05 be 0.2 Al 0.1 B 0.15 Ti 0.02 Si 1.53 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 6.4 Fe 0.05 Cu 0.05 b...

Embodiment 2

[0012] Embodiment 2: the solid KNO 3 : Fe(NO 3 ) 3 9H 2 O: boric acid: Al(NO 3 ) 3 9H 2 O: Cu(NO 3 ) 3 ·3H 2 O according to K 6.4 Fe 0.05 Cu 0.05 be 0.2 Al 0.1 B 0.15 Ti 0.02 Si 1.53 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 6.4 Fe 0.05 Cu 0.05 be 0.2 Al 0.1 B 0.15 Ti 0.02 Si 1.53 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 6.4 Fe 0.05 Cu 0.05 b...

Embodiment 3

[0013] Embodiment 3: the solid KNO 3 : Fe(NO 3 ) 3 9H 2 O: boric acid: Al(NO 3 ) 3 9H 2 O: Cu(NO 3 ) 3 ·3H 2 O according to K 6.4 Fe 0.05 Cu 0.05 be 0.2 Al 0.1 B 0.15 Ti 0.02 Si 1.53 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 6.4 Fe 0.05 Cu 0.05 be0.2 Al 0.1 B 0.15 Ti 0.02 Si 1.53 o 7 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 6.4 Fe 0.05 Cu 0.05 be ...

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Abstract

The invention relates to a liquid phase synthesis K<6.4>Fe<0.05>Cu<0.05>Be<0.2>Al<0.1>B<0.15>Ti<0.02>Si<1.53>O<7> potassium fast ion conductor and a preparation method thereof. The conductor is characterized in that: Al<3+>, Be<2+>, and B<3+> partially replace Si<4+> ions, and interstitial potassium ions are generated in crystals, so the activation energy of potassium ion migration is reduced; thesize of the migration channels of potassium ions is adjusted by Be<2+> and B<3+> doping with small ionic radius, so the rapid migration of potassium ions is adapted; a distorted crystal lattice structure is formed by partial doping of Ti<4+>, so lattice defects are increased and potassium ion conduction is facilitated; cation vacancies are formed by partial doping of Fe<3+> and Cu<2+>, so the potassium ion migration paths are increased; and in the preparation process, the surface of K6Si2O7 particles is modified, so an easy-sintering property is formed. Through synergistic effects, the normal-temperature potassium ion conductivity of the potassium fast ion conductor exceeds 6*10<-4>S / cm, and 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 Applications(China)
IPC IPC(8): H01M10/0562H01M10/054C04B35/622C04B35/16
CPCC04B35/16C04B35/622C04B2235/3201C04B2235/3205C04B2235/3217C04B2235/3232C04B2235/3272C04B2235/3281C04B2235/3409C04B2235/6562C04B2235/6567C04B2235/6583H01M10/054H01M10/0562H01M2300/0071Y02E60/10
Inventor 水淼
Owner NINGBO UNIV
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