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Novel sodium ion battery positive electrode material and preparation method thereof

A technology for sodium-ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of reducing side reactions, long cycle life, and improving conductivity and stability

Inactive Publication Date: 2018-09-21
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, iron-based polyanionic cathode materials with ideal sodium storage properties are still rarely reported so far.

Method used

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  • Novel sodium ion battery positive electrode material and preparation method thereof
  • Novel sodium ion battery positive electrode material and preparation method thereof
  • Novel sodium ion battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this example, raw materials include NaH 2 PO 4 and FeC 2 o 4 , where NaH 2 PO 4 Both a source of sodium and a source of phosphorus, FeC 2 o 4 as iron source, glucose as carbon source, NaH 2 PO 4 and FeC 2 o 4 The molar ratio is 3:2.

[0032] Using acetone as a dispersant, add acetone and raw materials into a ball mill tank, and perform ball milling in a planetary ball mill to obtain a precursor. The ball milling speed is 400r / min, and the ball milling time is 3h. The precursor was placed in a tube furnace, and under the protection of a high-purity argon atmosphere, the temperature was raised to 250°C at a rate of 1°C / min, and calcined at 250°C for 6 hours to obtain an intermediate product. Grind the intermediate product and press it into a tablet under a pressure of 20MPa to obtain a sheet-shaped intermediate product. Place the sheet-shaped intermediate product in a tube furnace and raise the temperature at a rate of 1°C / min under the protection of a high-pu...

Embodiment 2

[0035] In this example, raw materials include CH 3 COONa, FeC 2 o 4 , NH 4 h 2 PO 4 , (NH 4 ) 4 P 2 o 7 and sucrose, where CH 3 COONa is the sodium source, FeC 2 o 4 as iron source, NH 4 h 2 PO 4 and (NH 4 ) 4 P 2 o 7 as phosphorus source, sucrose as carbon source, CH 3 COONa, FeC 2 o 4 , NH 4 h 2 PO 4 , (NH 4 ) 4 P 2 o 7 The molar ratio is 3:2:1:1.

[0036] Using methanol as a dispersant, add methanol and raw materials into a ball mill tank, and perform ball milling in a planetary ball mill to obtain a precursor. The ball milling speed is 300r / min, and the ball milling time is 4h. The precursor was placed in a tube furnace, under the protection of a high-purity nitrogen atmosphere, the temperature was raised to 300°C at a rate of 2°C / min, and calcined at 300°C for 5h to obtain an intermediate product. Grind the intermediate product, and press it into a tablet under a pressure of 6 MPa to obtain a sheet-shaped intermediate product. The sheet-shaped...

Embodiment 3

[0039] In this example, raw materials include NaH 2 PO 4 , Fe(NO 3 ) 3 and phenolic resins, where NaH 2 PO 4 As both a source of sodium and phosphorus, Fe(NO 3 ) 3 as iron source, phenolic resin as carbon source, NaH 2 PO 4 , Fe(NO 3 ) 3 The molar ratio is 3:2.

[0040] Using ethanol as a dispersant, add ethanol and raw materials into a ball mill tank, and perform ball milling in a planetary ball mill to obtain a precursor. The ball milling speed is 100r / min, and the ball milling time is 6h. The precursor was placed in a tube furnace, and under the protection of a high-purity argon atmosphere, the temperature was raised to 350°C at a rate of 10°C / min, and calcined at 350°C for 4 hours to obtain an intermediate product. Grind the intermediate product and press it into a tablet under a pressure of 4 MPa to obtain a sheet-shaped intermediate product. Place the sheet-shaped intermediate product in a tube furnace and raise the temperature at a rate of 10°C / min under the ...

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Abstract

The invention discloses a novel sodium ion battery positive electrode material and a preparation method thereof. The sodium ion battery positive electrode material is a Na3Fe2PO4P2O7 / C composite material, wherein a weight ratio of C and Na3Fe2PO4P2O7 is (0 to 1): 1. The preparation method comprises the following steps: (1) performing ball milling on a sodium source, an iron source, a phosphorus source and a carbon source, and obtaining a precursor; (2) placing the precursor in an inertial atmosphere, calcining the precursor for 4 to 6 hours at the temperature of 250 to 350 DEG C, and obtainingan intermediate product; and (3) grinding the intermediate product, and tabletting molding the intermediate product at the pressure of 4MPa to 20MPa, then placing the molded intermediate product in the inertial atmosphere again, calcining the intermediate product for 2 to 12 hours at the temperature of 500 to 750 DEG C, and obtaining a target product. The sodium ion battery positive electrode material is stable in structure, long in cycling life, high in capacity retention rate and low in cost and is an ideal positive electrode of an energy-storage sodium ion battery.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for sodium ion batteries, and in particular relates to a novel positive electrode material for sodium ion batteries and a preparation method thereof. Background technique [0002] Energy is an important material basis for the survival and development of human society. At present, traditional fossil fuels such as coal, oil, and natural gas still occupy a large proportion of the global energy structure. The dwindling reserves of fossil energy and the serious environmental pollution caused by its utilization have forced countries all over the world to vigorously carry out research on new energy systems and energy storage technologies. Energy storage technologies currently in large-scale operation include mechanical energy storage, electrochemical energy storage, electromagnetic energy storage and phase change energy storage. Among them, electrochemical energy storage has the adv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5825H01M4/62H01M4/625H01M10/054Y02E60/10
Inventor 陈重学汪慧明蒲想军
Owner WUHAN UNIV
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