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Sodium-ion battery positive electrode material Na3Fe2(PO4)3 and preparation method thereof

A sodium-ion battery, NH4H2PO4 technology, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effect of convenient large-scale application and simple preparation method

Active Publication Date: 2017-02-22
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new technology makes it easier than previous methods because its process was simpler compared to older techniques that were more complicated or expensive.

Problems solved by technology

This patents discusses different types of batteries called primary or second generation batteries due to limitations like expensive metals needed during production process and potential negative impact upon environment caused by disposal after use. Secondary batteries offer better efficiency compared to current ones while being less expensive and having longer lifetimes. Therefore, there needs to develop suitable alternatives to conventional lead acid batteries without compromising safety concerns associated with them.

Method used

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  • Sodium-ion battery positive electrode material Na3Fe2(PO4)3 and preparation method thereof
  • Sodium-ion battery positive electrode material Na3Fe2(PO4)3 and preparation method thereof
  • Sodium-ion battery positive electrode material Na3Fe2(PO4)3 and preparation method thereof

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Experimental program
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Embodiment 1

[0041] Monoclinic Na was synthesized by a simple solid-phase synthesis 3 Fe 2 (PO 4 ) 3 . FePO synthesized by coprecipitation method 4 As a precursor, with anhydrous CH 3 COONa, NH 4 h 2 PO 4 Mix by ball milling at a molar ratio of 2:3:1. First solid phase ball milling 4h, then liquid phase ball milling 4h (alcohol as ball milling medium, planetary ball mill). The obtained mixture was dried in a drying oven at 80° C. for 12 h, and the alcohol was completely evaporated. The obtained solid powder was calcined in a tube furnace at 600 °C for 10 h in an air atmosphere (air flow rate 20 mL min -1 ). get monoclinic Na 3 Fe 2 (PO 4 ) 3 -600 materials.

Embodiment 2

[0043] Compared with Example 1 in this example, except that the calcination temperature is 500 ° C, other conditions and steps are the same as Example 1, and finally a sodium ion battery positive electrode material Na 3 Fe 2 (PO 4 ) 3 -500.

Embodiment 3

[0045] Except that the calcination temperature is 700°C, other conditions and steps are the same as in Example 1, and finally a sodium ion battery positive electrode material Na 3 Fe 2 (PO 4 ) 3 -700.

[0046] The sodium ion battery cathode material Na that embodiment 1-3 obtains 3 Fe 2 (PO 4 ) 3 -500, Na 3 Fe 2 (PO 4 ) 3 -600, Na 3 Fe 2 (PO 4 ) 3 The XRD pattern of -700 is as figure 1 shown. XRD results showed that the 500℃ heat-treated Na 3 Fe 2 (PO 4 ) 3 A complete crystal structure was not formed, only a few diffraction peaks. When the temperature is raised to 600°C, the obtained substance is monoclinic Na 3 Fe 2 (PO 4 ) 3 , with standard Na 3 Fe 2 (PO 4 ) 3 The XRD pattern can correspond well. The same Na obtained by heat treatment at 700℃ 3 Fe 2 (PO 4 ) 3 The structure corresponds to the monoclinic Na 3 Fe 2 (PO 4 ) 3 . From figure 2 It can be seen from the scanning electron microscope photos that with the increase of heat treatmen...

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Abstract

The invention relates to a sodium-ion battery positive electrode material Na3Fe2(PO4)3 and a preparation method thereof. The preparation method is a solid-phase sintering method or a sol-gel method, wherein the solid-phase sintering method comprises the following steps of mixing an iron salt, a sodium salt and a phosphate, enabling the mole ratio of three ions of Fe<3+>, Na<+> and PO4<3+> to be 2:3:3, performing calcination in an air atmosphere to obtain a monoclinic Na3Fe2(PO4)3 positive electrode material; and the sol-gel method comprises the following steps of (1) weighing and dissolving Fe(NO<3>)<3>.9H<2>O and CH3COONa in deionized water, maintaining a stirring condition, adding citric acid, simultaneously adding NH4H2PO4 and polyvinyl alcohol, and performing stirring, heating and water bath reaction to obtain sol; and (2) drying the sol obtained in the step (1) to obtain gel, and performing calcination in the air atmosphere to obtain a pure-phase monoclinic mesopore Na3Fe2(PO4)3 positive electrode material. Compared with the prior art, the preparation method has the advantages of simple and practical synthesis process and the like, and the electrochemical performance of the positive electrode material is excellent.

Description

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Claims

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Application Information

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Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER