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Carbon-coated NaxRyM2(PO4)3 material and preparation and application thereof

A technology of carbon coating and carbon source, applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of low theoretical specific capacity, low theoretical specific capacity, and limited application fields

Inactive Publication Date: 2019-06-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Na x m 2 (PO 4 ) 3 The theoretical specific capacity of the battery is not high. Through the improvement and innovation of the preparation method, the researchers made the material nanometer, which effectively improved the effective specific capacity of the material. At a lower rate, the specific capacity of the assembled sodium-ion battery is close to the theoretical one. Specific capacity, however, the theoretical specific capacity of this material is not very high, and the energy density is up to 400Wh / kg (the voltage platform is up to 3.4V), which limits its application field

Method used

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  • Carbon-coated NaxRyM2(PO4)3 material and preparation and application thereof
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  • Carbon-coated NaxRyM2(PO4)3 material and preparation and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Embodiment 1: (sol-gel method prepares carbon coated Na 2.9 Li 0.1 V 2 (PO 4 ) 3 )

[0061] The mass of sodium hydroxide, lithium hydroxide, ammonium metavanadate, and ammonium dihydrogen phosphate is weighed in a molar ratio of 2.9:0.1:2:3, and both the reducing agent and the carbon source are selected from citric acid as an example. Mix ammonium, citric acid at a molar ratio of 1:1 (40.46% in citric acid as a reducing agent, 59.54% as a carbon source) and 250ml of deionized water, stir and heat in a water bath (80°C) to form a uniform blue color solution, add weighed sodium hydroxide, lithium hydroxide and ammonium dihydrogen phosphate into the above blue solution, and stir to form a sol. The sol was then rotary evaporated at 75° C. for 1 hour under vacuum condition to form a gel. Subsequently, the gel was dried in a vacuum oven at 130°C for 10 h to form Na 2.9 Li 0.1 V 2 (PO 4 ) 3 Precursor. The precursor is pre-sintered at 350°C for 5 hours under inert g...

Embodiment 2

[0062] Embodiment 2: (solid phase ball milling method prepares carbon coated Na 2.5 Li 0.5 V 2 (PO 4 ) 3 )

[0063] The mass of sodium hydroxide, lithium hydroxide, ammonium metavanadate and ammonium dihydrogen phosphate is weighed in a molar ratio of 2.5:0.5:2:3, and both the reducing agent and the carbon source are selected from citric acid (ammonium metavanadate and citric acid The mol ratio is 1:1, wherein 40.46% is reducing agent in citric acid, and 59.54% is carbon source), above-mentioned material is mixed and put into the high-energy ball mill jar, and add quartz ball; Quartz ball total mass and sodium hydroxide, sodium hydroxide, Lithium hydroxide, ammonium metavanadate, ammonium dihydrogen phosphate and citric acid are added at a mass ratio of 1:1; then placed on a high-energy ball mill for ball milling, the ball milling speed is 480r / min, and the ball milling time is 24h; the ball milled mixture Pre-sintered at 350°C for 5 hours in an inert atmosphere, and then...

Embodiment 3

[0064] Embodiment 3: (wet phase ball milling method prepares carbon coated Na 2.9 K 0.1 V 2 (PO 4 ) 3 )

[0065]Be 2.9:0.1:2:3 by weighing the quality of sodium hydroxide, potassium hydroxide, ammonium metavanadate, ammonium dihydrogen phosphate, reducing agent and carbon source are selected as citric acid (ammonium metavanadate and lemon The mol ratio of acid is 1:1, wherein 40.46% is reducing agent in citric acid, and 59.54% is carbon source), above-mentioned mixture is added in the high-energy ball mill tank, and 250ml deionized water is added to form mixed solution. Then put the above mixed solution on a high-energy ball mill for ball milling, the ball milling speed is 480r / min, and the ball milling time is 24h; the mixture after ball milling is taken out and dried in a drying oven at 100°C for 12h to remove the deionized water in the mixed solution, Precursor A is formed, and then the precursor A is pre-sintered at 350°C for 5 hours in an inert atmosphere, and then s...

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Abstract

The invention relates to a carbon-coated NaxRyM2(PO4)3 material and preparation and application thereof. In an R-doped NMP, M is one or more of transition metal elements V, Fe and Nb, R is one or moreof doping elements Li, K, Rb, Cs, Fr, Be, Ca, Mg, Sr, Ba, B, Al, and Zn, y is larger than or equal to 0.005 and smaller than 7, x is larger than y, and x is larger than or equal to 1 and smaller thanor equal to 7. The specific capacity of the obtained carbon-coated NaxRyM2(PO4)3 material can exceed a theoretical specific capacity to achieve a higher energy density effect.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a positive electrode material of a sodium ion battery. technical background [0002] As we all know, due to the limited reserves and concentrated distribution of Li resources, its large-scale popularization and application in the fields of electric vehicles and mobile power supplies has been limited. According to relevant data, according to the current Li resource consumption rate, global Li resources can only last for ~60 years. At present, the price of Li carbonate also fluctuates greatly, and the average price has increased from 40,000 per ton in 2015 to 160,000 per ton in September 2017. In this case, it is necessary to find suitable resources to replace Li in Li-ion batteries or as a supplement to Li-ion batteries. In the periodic table of elements, Na and Li belong to the same main group and have similar physical and chemical properties. In the earth's crust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCY02E60/10
Inventor 郑琼张华民易红明李先锋凌模翔
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI