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Composite positive electrode material for sodium-ion battery and preparation method of composite positive electrode material

A technology of composite cathode material and sodium ion battery, applied in the field of sodium ion battery, can solve the problems of deteriorating material properties, many impurity phases of materials, poor doping effect, etc. Effect of Rate Cycling Performance

Active Publication Date: 2016-09-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Doping generally adopts solid phase ball milling method, but the material obtained by it has many impurity phases, the doping effect is not good, and may even deteriorate the material performance

Method used

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  • Composite positive electrode material for sodium-ion battery and preparation method of composite positive electrode material

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Embodiment 1

[0052] (1) present embodiment comprises the following steps: present embodiment design generates 0.03mol target product Na 2 Fe 0.8 Ni 0.2 P 2 o 7 / rGO, dissolve 0.85g graphene oxide in 80mL ethanol solution, add 1g ascorbic acid, ultrasonically disperse for 3h, add 0.024mol ferric nitrate and 0.006mol nickel acetate into the graphene oxide ethanol solution, stir well and then slowly add 0.06mol Ammonium dihydrogen phosphate, while supplemented by vigorous stirring, to obtain a mixed solution;

[0053] (2) Stir and heat the obtained mixed solution at 80° C. for 1 h, add 0.031 mol of sodium carbonate at a uniform rate, and at the same time supplement with vigorous stirring, react at 80° C. for 2 h, and then separate the solid from the liquid, wash with ethanol aqueous solution until the eluate is neutral, Drying, the resulting solid product is Na 2 Fe 0.8 Ni 0.2 P 2 o 7 Precursor of / rGO;

[0054] (3) The precursor obtained in step (2) is first sintered at 350°C under...

Embodiment 2

[0061] This embodiment includes the following steps:

[0062] (1) The design of this embodiment generates 0.03mol target product Na 2 Fe 0.8 Ni 0.2 P 2 o 7 / rGO, dissolve 0.85g graphene oxide in 80mL ethylene glycol solution, add 1g ascorbic acid, ultrasonically disperse for 3h, add 0.024mol iron nitrate and 0.006mol nickel acetate into the graphene oxide ethanol solution, stir well and then slowly add 0.06mol ammonium dihydrogen phosphate, supplemented by vigorous stirring simultaneously, to obtain a mixed solution;

[0063] (2) Stir and heat the resulting mixed solution at 80° C. for 1 h, add 0.03 mol of sodium carbonate at a uniform rate, and at the same time supplement with vigorous stirring, react at 80° C. for 2 h, and then separate the solid from the liquid, wash with ethanol aqueous solution until the eluate is neutral, Drying, the resulting solid product is Na 2 Fe 0.8 Ni 0.2 P 2 o 7 Precursor of / rGO;

[0064] (3) The precursor obtained in step (2) is first...

Embodiment 3

[0067] This embodiment includes the following steps:

[0068] (1) The design of this embodiment generates 0.03mol target product Na 2 Fe 0.5 Ni 0.5 P 2 o 7 / rGO, dissolve 0.85g graphene oxide in 80mL ethanol solution, add 1g ascorbic acid for ultrasonic dispersion for 3h, add 0.015mol ferric nitrate and 0.015mol nickel acetate into the graphene oxide ethanol solution, stir well and then slowly add 0.06mol phosphoric acid Ammonium dihydrogen, supplemented by vigorous stirring simultaneously, obtains mixed solution;

[0069] (2) Stir and heat the resulting mixed solution at 80° C. for 1 h, add 0.032 mol of sodium carbonate at a uniform rate, and at the same time supplement with vigorous stirring, react at 80° C. for 2 h, then separate the solid from the liquid, wash with ethanol aqueous solution until the eluate is neutral, Drying, the resulting solid product is Na 2 Fe 0.5 Ni 0.5 P 2 o 7 Precursor of / rGO;

[0070] (3) The precursor obtained in step (2) is first sint...

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Abstract

The invention discloses a composite positive electrode material for a sodium-ion battery and a preparation method of the composite positive electrode material. An Na<2>Fe<1-x>Ni<x>P<2>O<7> precursor grows in a graphene oxide (GO) solution by a coprecipitation method in situ; and graphene oxide is reduced when Na<2>Fe<1-x>Ni<x>P<2>O<7> nanoparticles are obtained in a calcining manner, thereby obtaining a vegetable sponge-shaped Na<2>Fe<1-x>Ni<x>P<2>O<7> / reduced graphene oxide nanocomposite material. The synthesis method is simple; the conditions are mild; and the yield is high. In the prepared composite material, active materials are dispersed uniformly; and the composite positive electrode material has high specific capacity, high working voltage, good cycling stability and excellent rate capability when used as a sodium-ion positive electrode material.

Description

technical field [0001] The invention belongs to the field of sodium ion batteries, and in particular relates to a composite positive electrode material for sodium ion batteries and a preparation method thereof. Background technique [0002] Since the commercial production of lithium-ion batteries by SONY in the 1990s, lithium-ion batteries have achieved rapid development in various fields, among which they have an absolute advantage in the 3C market, and have also made steady progress in the fields of electric power and energy storage. And show good development prospects. However, due to the shortage of lithium metal resources in the world, the manufacturing cost of lithium-ion batteries is on the rise, which greatly limits the development of lithium-ion batteries in the field of electric vehicles and large-scale energy storage. The energy storage field urgently needs excellent performance, Inexpensive secondary batteries replace current lead-acid batteries. Sodium, which ...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/58H01M4/139H01M10/36
CPCH01M4/139H01M4/362H01M4/5825H01M4/583H01M10/36Y02E60/10
Inventor 张治安陈晓彬史晓东赖延清李劼张凯
Owner CENT SOUTH UNIV
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