Glassy-state potassium-doped fast ion conductor K2O. 4SiO2 and preparation method thereof

A technology of ion conductor and doped glass, which is applied in the direction of final product manufacturing, sustainable manufacturing/processing, structural parts, etc., to reduce the activation energy of conduction, improve the activity and conductivity

Active Publication Date: 2021-01-29
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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  • Glassy-state potassium-doped fast ion conductor K2O. 4SiO2 and preparation method thereof
  • Glassy-state potassium-doped fast ion conductor K2O. 4SiO2 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: K 2 CO 3 , MnCO 3 , Silicic acid according to (K 2 O) 0.95 0.05(MnO) 4SiO 2The ratio of the stoichiometric molar ratio is evenly mixed, adding quality is the dehydrated alcohol of mixture quality 3%, in ball mill with the rotating speed ball mill of 200 rev / mins 12 hours, after ball mill finishes, in 60 ℃ of vacuum ovens (gas pressure in oven is at 10Pa) for 3 hours, take it out and re-grind in an agate mortar for 12 minutes, heat up the ground powder at a rate of 5°C / min to 500°C for 12 hours in an argon atmosphere, and then cool it with the furnace; The final powder is ground again in an agate mortar for 10 minutes, and the ground powder is heated up to 750 °C at a rate of 5 °C / min in an argon atmosphere in a closed crucible, and then quickly taken out at room temperature under argon gas. The glassy potassium fast ion conductor was fabricated by cooling in medium.

Embodiment 2

[0014] Example 2: K 2 CO 3 、NiCO 3 , Silicic acid according to (K 2 O) 0.9 0.1(NiO) 4SiO 2 The ratio of the stoichiometric molar ratio is evenly mixed, adding quality is the dehydrated alcohol of mixture quality 9%, in ball mill with the rotating speed ball mill of 500 rev / mins 45 hours, after ball mill finishes, in 120 ℃ of vacuum ovens (gas pressure in the oven is at 100Pa) for 10 hours, take it out and re-grind in an agate mortar for 28 minutes, heat up the ground powder to 550°C at a rate of 30°C / min in an argon atmosphere and then cool it with the furnace for 20 hours; The final powder is ground again in an agate mortar for 30 minutes, and the ground powder is heated up to 850 °C at a rate of 15 °C / min in an argon atmosphere in a closed crucible, and then quickly taken out at room temperature under argon gas. The glassy potassium fast ion conductor was fabricated by cooling in medium.

Embodiment 3

[0015] Example 3: K 2 CO 3 , MnCO 3 , Silicic acid according to (K 2 O) 0.93 0.07(MnO) 4SiO 2 The ratio of the stoichiometric molar ratio is uniformly mixed, adding quality is the dehydrated alcohol of mixture quality 5%, in ball mill with the rotating speed ball mill of 400 rev / mins 30 hours, after ball mill finishes, in 100 ℃ of vacuum ovens (gas pressure in oven is at 50Pa) for 8 hours, take it out and re-grind in an agate mortar for 20 minutes, and the ground powder is heated to 520°C at a rate of 20°C / min in an argon atmosphere and then cooled with the furnace after being kept for 15 hours; The final powder was ground again in an agate mortar for 22 minutes, and the ground powder was heated up to 800 °C at a rate of 10 °C / min in an argon atmosphere in a closed crucible, and then quickly taken out at room temperature under argon gas. The glassy potassium fast ion conductor was fabricated by cooling in medium.

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Abstract

The invention relates to a glassy potassium doped fast ion conductor K2O. 4SiO2 and a preparation method thereof, and the glassy potassium doped fast ion conductor K2O. 4SiO2 is characterized in thatthe stoichiometric formula is (K2O)1-x. x (MO). 4SiO2, x is equal to 0.05-0.10, and M is one of Mn and Ni; and a random K2O. 4SiO2 structure is adopted, and transition metal ions are synergistically doped, so that the conduction activation energy of potassium ions is further reduced, the activity and conductivity of the potassium ions are improved, the normal-temperature lithium ion conductivity of the potassium fast ion conductor exceeds 3*10<-4> S / cm, the glassy potassium doped fast ion conductor K2O. 4SiO2 can be used as a potassium fast ion conductor with excellent performance, and the conductivity 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] Fast ionic conductors, also known as superionic conductors, refer to a class of ionic conductivity that can be compared with liquid electrolytes in a certain temperature range (10 -6 S / cm) and low ion conductance activation energy (generally less than 0.4eV). Fast ionic conductors have important applications in the fields of energy storage battery electrode materials, gas detectors, solid electrolyte diaphragms, supercapacitors, timers, coulomb counters, and electrochromic displays. [0003] The migration rate of carriers in fast ion conductors is often much lower than the charge transfer on the electrode surface and the ion diffusion rate in the electrode material, which becomes the rate-controlling step in the entire electrode reaction kinetics. Lithium fast-ion conductors are at the heart of developing high-performance applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C6/00C03C3/078C01B33/32H01M10/054H01M10/0562
CPCC03C1/00C03C3/078C01B33/32H01M10/0562H01M10/054H01M2300/0071Y02P70/50
Inventor 水淼舒杰任元龙
Owner NINGBO UNIV
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