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Iron-based phosphate sodium ion battery positive electrode material and preparation method thereof

A technology of iron-based sodium phosphate and sodium-based phosphate, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as side reactions and affecting cycle stability

Pending Publication Date: 2022-08-09
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, nanoscale electrode materials can achieve faster ion diffusion, but the larger electrolyte / electrode interface due to size reduction will lead to more side reactions and affect cycle stability.

Method used

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  • Iron-based phosphate sodium ion battery positive electrode material and preparation method thereof
  • Iron-based phosphate sodium ion battery positive electrode material and preparation method thereof
  • Iron-based phosphate sodium ion battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Preparation of Na by sol-gel method combined with high temperature solid phase method 2 FeP 2 O7 .

[0035] 2.62 g NH 4 H 2 PO 4 and 1 ml of aniline were dissolved in 200 ml of deionized water, and 5.51 g Fe(NO) was slowly added dropwise with stirring. 3 ) 3 The aqueous solution obtained by dissolving in 100 ml of deionized water was stirred at room temperature for 5 h to obtain a polyaniline-coated iron phosphate precursor;

[0036] Then add 3.04 g Na to the mixed solution containing the iron phosphate precursor 2 C 2 O 4 and 2.61 g NH 4 H 2 PO 4 , then add 15% sucrose by mass of all raw materials, and continue stirring for 20 min. The mixed gel precursor was obtained after drying in a blast drying oven at 80 °C for 48 h;

[0037] The precursors were ground and placed in a tube furnace, pre-fired at 350 °C for 4 h in an argon atmosphere containing 5% hydrogen, and then ground and mixed uniformly. Then calcined at 550 °C for 12 h in a mixture of...

Embodiment 2

[0040] Example 2: Preparation of Na by sol-gel method combined with high temperature solid phase method 4 Fe 3 (PO 4 ) 2 P 2 O 7 .

[0041] The preparation method of the polyaniline-coated nano-iron phosphate precursor is as in Example 1;

[0042] Add 2.49 g CH to the aforementioned mixed solution 3 COONa, 0.87 g NH 4 H 2 PO 4 And the total mass of these raw materials is about 15% sucrose, and the stirring is continued for 30 minutes. The mixed gel precursor was obtained after drying in a blast drying oven at 80 °C for 48 h;

[0043] In an argon atmosphere containing 5% hydrogen, pre-fire at 400 °C for 4 h, and then grind and mix well. Then calcined in a hydrogen-argon mixture at 550 °C for 12 h to obtain nano-sized Na 4 Fe 3 (PO 4 ) 2 P 2 O 7 .

[0044] The Na prepared above was 4 Fe 3 (PO 4 ) 2 P 2 O 7 The positive electrode powder was fabricated into electrode sheets as described in Example 1, and then assembled into a CR2016 coin cell. The current ...

Embodiment 3

[0045] Example 3: Preparation of Na by spray drying method combined with high temperature solid phase method 3 Fe 2 (PO 4 )P 2 O 7 .

[0046] The preparation method of the iron phosphate precursor is as in Example 1. Add 2.29 gNa to the mixed solution containing the iron phosphate precursor 2 C 2 O 4 , 1.31 g NH 4 H 2 PO 4 And the sucrose of about 15% of the total mass of these raw materials is continuously stirred for 30 minutes, and then spray-dried to obtain a precursor.

[0047] The obtained precursor was pre-calcined at 400 °C for 4 h in a hydrogen-argon mixture (containing 5% hydrogen), ball-milled for 2 h, and then calcined at 550 °C for 12 h to obtain nano-sized Na 3 Fe 2 (PO 4 )P 2 O 7 positive electrode material.

[0048] The prepared positive electrode material was prepared into an electrode sheet according to the method in Example 1, and the battery was assembled and tested. Voltage range of 1.5-4.2 V and current density of 10 mA g -1 The battery ...

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Abstract

The invention belongs to the technical field of sodium-ion batteries, and particularly relates to an iron-based phosphate sodium-ion battery positive electrode material and a preparation method thereof. The preparation method comprises the following steps: preparing a polyaniline coated iron phosphate composite material; the preparation method comprises the following steps: by taking polyaniline-coated iron phosphate as a precursor, adding sodium salt and phosphate to prepare an iron-based phosphate sodium-ion battery positive electrode material; the preparation method of the polyaniline-coated iron phosphate precursor comprises the following steps: adding a trivalent iron salt into a solution containing phosphate and aniline to generate nano-sized iron phosphate active substance particles, and promoting polymerization of aniline on the surface of iron phosphate to obtain polyaniline-coated nano iron phosphate. The material has excellent electronic and ionic conductance and excellent electrochemical performance. The polyaniline shell of the ferric phosphate precursor can be carbonized into a conductive carbon layer in the high-temperature calcination process, on one hand, the electronic conductivity of the material is enhanced, and on the other hand, the increase of active material particles in the high-temperature process is inhibited, so that ion diffusion is enhanced.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and particularly relates to a positive electrode material for an iron-based phosphate sodium ion battery and a preparation method thereof. Background technique [0002] With the further development of human society, the requirements for future energy storage systems are further improved, and limited by the current situation that lithium-ion batteries have potential safety hazards and low lithium resource reserves, the development of new secondary batteries is imminent. The abundant reserves and simple extraction of sodium resources make sodium-ion batteries have significant cost advantages, so they have received extensive attention and research. [0003] The main factor affecting the performance of sodium-ion batteries is its positive / negative electrode materials, so it is crucial to design and synthesize positive / negative electrode materials with excellent performance. Cathode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/04H01M10/054B82Y40/00B82Y30/00
CPCH01M4/366H01M4/5825H01M4/625H01M4/0471H01M10/054B82Y40/00B82Y30/00H01M2004/028H01M2004/021Y02E60/10
Inventor 夏永姚曹永杰曹心乐李国栋刘瑶
Owner FUDAN UNIV
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