A method for preparing silver cobaltate polycrystalline powder with high single-phase delafossite structure

A delafossite, single-phase technology, applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve problems such as difficult synthesis of silver-based delafossite compounds, achieve good economic and social benefits, and operate The effect of convenience and mild reaction conditions

Inactive Publication Date: 2016-05-11
INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the thermal decomposition temperature of silver oxide is only 300°C, it is difficult to synthesize silver-based delafossite compounds by traditional high-temperature solid-state methods

Method used

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  • A method for preparing silver cobaltate polycrystalline powder with high single-phase delafossite structure
  • A method for preparing silver cobaltate polycrystalline powder with high single-phase delafossite structure
  • A method for preparing silver cobaltate polycrystalline powder with high single-phase delafossite structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 12 g of special grinding balls for high-energy ball mills, weigh 2 g of lithium cobaltate raw materials according to the mass ratio of special grinding balls for high-energy ball mills to lithium cobaltate as 6:1, and place the grinding balls and lithium cobaltate in a ball mill tank Ball milling was performed on a high-energy ball mill with a rotating speed of 1425 rpm and a ball milling time of 2 hours to obtain a treated lithium cobalt oxide sample. Take by weighing 20g silver nitrate, according to the mass ratio of grinding ball and silver nitrate is 1: 1, select quality to be 20g grinding ball, put grinding ball and silver nitrate powder in ball mill tank and carry out ball milling on planetary ball mill, wherein rotating speed is 400rpm, the ball milling time is 4h, and the treated silver nitrate sample is obtained. Weigh 1.8g (separate after grinding, loss) (1.80 / 97.87=0.018mol) lithium cobaltate sample and 3.40g (3.40 / 169.87=0.02mol) according to the molar...

Embodiment 2

[0027] Weigh 12 g of special grinding balls for high-energy ball mills, weigh 1 g of lithium cobaltate raw material according to the mass ratio of special grinding balls for high-energy ball mills to lithium cobaltate as 12:1, and place the grinding balls and lithium cobaltate in a ball mill tank Ball milling was performed on a high-energy ball mill with a rotating speed of 1425 rpm and a ball milling time of 8 hours to obtain a treated lithium cobalt oxide sample. Take by weighing 20g silver nitrate, be 1.8: 1 to select quality as 36g grinding ball by the mass ratio of grinding ball and silver nitrate, put grinding ball and silver nitrate powder in the ball mill tank and carry out ball milling on planetary ball mill, wherein rotating speed is 400rpm, the ball milling time is 2h, and the treated silver nitrate sample is obtained. Weigh 0.8g (0.8 / 97.87=0.008mol) of lithium cobaltate sample and 2.04g (2.04 / 169.87=0.012mol) of silver nitrate sample according to the molar ratio of...

Embodiment 3

[0029] Weigh 24g of the special grinding balls for the high-energy ball mill, weigh 4.8g of lithium cobaltate raw material according to the mass ratio of the special grinding balls for the high-energy ball mill to lithium cobaltate as 5:1, and place the grinding balls and lithium cobaltate in the ball mill jar In the process, ball milling was performed on a high-energy ball mill with a rotating speed of 1425 rpm and a ball milling time of 6 hours to obtain a treated lithium cobaltate sample. Take by weighing 20g silver nitrate, according to the mass ratio of grinding ball and silver nitrate, be 3: 1 to select quality and be 60g grinding ball, put grinding ball and silver nitrate powder in ball mill jar and carry out ball milling on planetary ball mill, wherein rotating speed is 400rpm, the ball milling time is 1h, and the treated silver nitrate sample is obtained. Weigh 1g (1 / 97.87=0.01mol) lithium cobaltate sample and 3.05g (3.05 / 169.87=0.018mol) silver nitrate sample accordi...

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Abstract

The invention discloses a simple, fast and environmental-protection preparation method for preparing a high single-phase delafossite structure silver cobaltate polycrystalline powder. The method comprises the steps: firstly, respectively preprocessing cobaltate and a silver nitrate solid powder, then weighing the processed cobaltate and the processed silver nitrate solid powder according to a certain ratio and mixing, sintering the evenly mixed solid powder at the temperature of 200 DEG C-280 DEG C for 2-30 h, finally cleaning the sintered product with deionized water until the filtrate pH is 7.0, and baking the filter cake in an infrared box for 2-6 h to obtain the high single-phase delafossite structure silver cobaltate powder. The method requires no additives, and has the advantages of mild reaction conditions, low energy consumption, simple process, and convenient and safe operation. The prepared delafossite structure silver cobaltate polycrystalline powder can be widely used in the fields of electron devices, thermoelectric materials and the like, and has good economic benefits and social benefits.

Description

technical field [0001] The invention relates to a method for preparing silver cobaltate polycrystalline powder with a delafossite structure, in particular to a method for preparing a silver cobaltate polycrystalline powder with a delafossite structure with high single-phase property. Background technique [0002] The copper-iron ore structure is ABO 2 , the A position is a monovalent cation, and the B position is a trivalent cation. It has good application prospects in the fields of thermoelectric materials, solar cells and transparent conductive oxides. In silver-based delafossite structure compounds, due to the strong hybridization of cobalt 3d10 orbitals and oxygen 2P6 orbitals, the localization of oxygen ions to holes is weakened, so that silver cobaltate (AgCoO 2 ) has a high conductivity, which has attracted widespread attention. [0003] The synthesis methods of delafossite polycrystalline powder include high-temperature solid-phase method and liquid-phase method. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00
Inventor 冯秀丽
Owner INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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