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Preparation method of Nb-modified sodium ion battery cathode material

A sodium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor conductivity, low specific capacity, and poor rate performance, and achieve improved performance, not easy to fall off, and ensure uniformity Effect

Inactive Publication Date: 2017-11-24
SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive electrode material of sodium ion batteries has poor conductivity, and the radius of sodium ions is larger than that of lithium ions. Sodium deintercalation is more difficult than lithium deintercalation, resulting in lower actual release specific capacity and poor rate performance of the material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition of the niobium-modified cathode material is Na 3 V 1.99 Nb 0.01 (PO 4 ) 3 ; The molar ratio is 3:1.99:0.01:3. Weigh sodium chloride, vanadium pentoxide, niobium pentachloride and potassium phosphate.

[0026] Add the vanadium pentoxide and glucose to the deionized water to dissolve, heat and stir at a temperature of 60-80 degrees to form a uniform mixed solution one; add the above-mentioned niobium pentachloride with ethanol solution to the reaction kettle, and add the uniform mixed solution at the same time, Stir magnetically at room temperature to obtain a homogeneous mixed solution 2, and then continue to stir for more than 3-5 hours; add the sodium chloride and potassium phosphate to the above mixed solution 2, and rotate and steam for 3 hours at a vacuum temperature of 70°C; Vacuum drying at ℃ for 5h to form the electrode material precursor, ground the precursor, and then place it in a muffle furnace for primary calcination, the temperature of the prima...

Embodiment 2

[0030] The composition of the niobium-modified cathode material is Na 3 V 1.97 Nb 0.03 (PO 4 ) 3 , The molar ratio is 3:1.97:0.03:3. Weigh sodium chloride, vanadium pentoxide, niobium pentachloride and potassium phosphate.

[0031] Add the vanadium pentoxide and glucose to the deionized water to dissolve, heat and stir at a temperature of 60-80 degrees to form a uniform mixed solution one; add the above-mentioned niobium pentachloride with ethanol solution to the reaction kettle, and add the uniform mixed solution at the same time, Stir magnetically at room temperature to obtain a homogeneous mixed solution 2, and then continue to stir for more than 3-5 hours; add the sodium chloride and potassium phosphate to the above mixed solution 2, and rotate for 4 hours at a vacuum temperature of 90°C; Vacuum drying at ℃ for 20h to form the electrode material precursor, the precursor is ground, and then placed in a muffle furnace for primary calcination, the temperature of the primary calci...

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PUM

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Abstract

The invention discloses a preparation method of an Nb-modified sodium ion battery cathode material. According to the preparation method, Nb ions are doped into the cathode material, isomorphous substitution is carried out on V ion sites in the lattices of the cathode material, and parameters of the lattices are changed, so that the cathode material with excellent electrochemical properties can be obtained. A solid melt is formed by a clad material and a contact agent, so that the Nb-modified sodium ion battery cathode material is easily coated evenly; furthermore, after being fired, the cathode material is combined closely, and a cladding layer does not easily fall off. The method not only shortens the production cycle, but also guarantees the cladding uniformity, and can enable the clad material to be heated by high temperature so as to form ideal glassy coating, thus improving the performance of the material.

Description

Technical field [0001] The invention relates to the field of battery materials, in particular to a preparation method of a niobium modified sodium ion battery cathode material. Background technique [0002] In recent years, the domestic new energy automobile industry has developed rapidly, and the types of batteries are abundant and diverse, and the market demand and requirements for batteries have gradually increased. Its most concerned key indicators are mainly concentrated in five aspects: safety and stability, cycle life, wide temperature resistance, charging speed and energy density. [0003] Whether the manufacturing cost and energy consumption of the battery cause pollution to the environment and the recycling rate of resources will also become important indicators for evaluating battery materials. The development of batteries has the following notable characteristics: the rapid development of green and environmentally friendly batteries; the conversion of primary batteries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M10/054
CPCH01M4/366H01M4/485H01M4/5825H01M10/054Y02E60/10
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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