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Rare earth metal doped cathode material for sodium-ion battery as well as preparation and application of cathode material

A sodium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of no improvement in electrical conductivity and achieve the effect of promoting electron conduction

Inactive Publication Date: 2018-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has no effect on the intrinsic conductivity of the material

Method used

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  • Rare earth metal doped cathode material for sodium-ion battery as well as preparation and application of cathode material
  • Rare earth metal doped cathode material for sodium-ion battery as well as preparation and application of cathode material
  • Rare earth metal doped cathode material for sodium-ion battery as well as preparation and application of cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: (Na 3 V 1.98 Ce 0.02 (PO 4 ) 3 )

[0025] The mass of sodium hydroxide, ammonium metavanadate, cerium nitrate and ammonium dihydrogen phosphate is weighed in a molar ratio of 3:1.98:0.02:2, and both the reducing agent and the carbon source are selected from citric acid as an example. First, ammonium metavanadate , cerium nitrate, and citric acid in a molar ratio of 1.98:0.02:2 (wherein 40.46% is a reducing agent and 59.54% is a carbon source) and 250ml of deionized water are mixed, stirred and heated in a water bath (80°C) to form a well-mixed For the blue solution, add weighed sodium 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 3 V 1.98 Ce 0.02 (PO 4 ) 3 Precursor. The precursor is pre-sintered at 350°C for 5 hours under i...

Embodiment 2

[0026] Embodiment 2: (Na 3 V 1.96 Ce 0.04 (PO 4 ) 3 )

[0027] The mass of sodium hydroxide, ammonium metavanadate, cerium nitrate and ammonium dihydrogen phosphate is weighed in a molar ratio of 3:1.96:0.04:2. Both the reducing agent and the carbon source are selected from citric acid as an example. First, ammonium metavanadate , cerium nitrate, and citric acid in a molar ratio of 1.96:0.04:2 (wherein 40.05% is a reducing agent and 59.95% is a carbon source) and 250ml of deionized water are mixed, stirred and heated in a water bath (80°C) to form a well-mixed For the blue solution, add weighed sodium 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 3 V 1.96 Ce 0.04 (PO 4 ) 3 Precursor. The precursor is pre-sintered at 350°C for 5 hours under inert...

Embodiment 3

[0028] Embodiment 3: (Na 3 V 1.94 Ce 0.06 (PO 4 ) 3 )

[0029] The mass of sodium hydroxide, ammonium metavanadate, cerium nitrate and ammonium dihydrogen phosphate is weighed in a molar ratio of 3:1.94:0.06:2. Both the reducing agent and the carbon source are selected from citric acid as an example. First, ammonium metavanadate , cerium nitrate, citric acid in a molar ratio of 1.94:0.06:2 (wherein 39.64% is a reducing agent and 60.36% is a carbon source) and 250ml of deionized water are mixed, stirred and heated in a water bath (80°C) to form a uniform mixture For the blue solution, add weighed sodium 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 3 V 1.94 Ce 0.06 (PO 4 ) 3 Precursor. The precursor is pre-sintered at 350°C for 5 hours under iner...

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Abstract

The invention relates to a rare earth metal doped cathode material for a sodium-ion battery as well as preparation and an application of the cathode material. The rare earth metal doped cathode material comprises Na3V(2-x)Mx(PO4)3. Through electrochemical performance testing, the prepared Na3V(2-x)Mx(PO4)3 material has high specific discharge capacity, excellent rate capability and cycle performance.

Description

technical field [0001] The invention relates to the field of electrode materials for sodium ion batteries, in particular to a rare earth metal element doped vanadium sodium sodium phosphate sodium ion battery positive electrode material and its preparation and application. technical background [0002] As we all know, metallic sodium element is relatively abundant in the earth's crust (sodium content in the earth's crust is about 2.75%, while lithium content is about 0.065‰) and widely distributed (sodium is distributed all over the world, while about 70% of lithium is concentrated in At the same time, the physical and chemical properties of sodium and lithium are similar and the extraction / intercalation mechanism is similar. Therefore, the research and development of sodium-ion batteries is expected to alleviate the limited development of energy storage batteries caused by the shortage of lithium resources to a certain extent. In addition to the advantages of abundant resou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/054
CPCH01M4/362H01M4/5825H01M10/054Y02E60/10
Inventor 张华民郑琼易红明刘婉秋张洪章冯凯李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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