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

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...

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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.

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