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Na<2-2x>Fe<1+x>P<2>O<7>/carbon composite material and preparation method and application thereof

A carbon composite material and composite material technology, used in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of low voltage platform, short cycle life, etc., to reduce impurity, less impurity, calcination temperature low effect

Active Publication Date: 2016-07-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Researchers have studied different systems of anode materials for sodium-ion batteries, among which P2-type and O3-type layered oxide systems are more representative, such as P2-Na 2 / 3 [Fe 1 / 2 mn 1 / 2 ]O 2 , O3-NaFe 0.5 co 0.5 o 2 , but these materials have short cycle life and low voltage plateau

Method used

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  • Na&lt;2-2x&gt;Fe&lt;1+x&gt;P&lt;2&gt;O&lt;7&gt;/carbon composite material and preparation method and application thereof
  • Na&lt;2-2x&gt;Fe&lt;1+x&gt;P&lt;2&gt;O&lt;7&gt;/carbon composite material and preparation method and application thereof
  • Na&lt;2-2x&gt;Fe&lt;1+x&gt;P&lt;2&gt;O&lt;7&gt;/carbon composite material and preparation method and application thereof

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Embodiment 1

[0050] This embodiment includes the following steps:

[0051] (1) This embodiment is designed to generate 0.03mol of the target product Na 2-2x Fe 1+x P 2 O 7 , Prepare solution 100mL: Weigh 0.827g glucose dissolved in 40mL ethylene glycol solution (the ratio of ethylene glycol and deionized water is 1:1), respectively weigh 0.06mol ammonium dihydrogen phosphate, 0.03mol nitric acid Iron and 0.0315 mol of sodium carbonate were separately dissolved in 20 mL of deionized water and stirred to dissolve. Add the phosphorus source, iron source, and sodium source to the alcohol solution of glucose drop by drop in the order of the phosphorus source, iron source, and sodium source, at a rate of 15mL / min, with vigorous stirring, and leave to stand for 24h after addition;

[0052] (2) Pour the mixed emulsion treated in step (1) into a stainless steel reactor. The volume of the reactor is 150 mL and the filling volume is 66.67%. The stainless steel reactor is placed in a 150°C constant tempera...

Embodiment 2

[0060] This embodiment includes the following steps:

[0061] (1) This embodiment is designed to generate 0.03mol of the target product Na 2-2x Fe 1+x P 2 O 7 / Carbon composite material, prepare 100mL solution: Weigh 1.634g of citric acid and dissolve in 40mL ethylene glycol solution (the ratio of ethylene glycol to deionized water is 1:1), respectively weigh 0.06mol of ammonium dihydrogen phosphate , 0.03mol of ferric nitrate, 0.0315mol of sodium carbonate, respectively, dissolved in 20mL of deionized water, and stirred to dissolve. Add the phosphorus source, iron source and sodium source to the alcoholic solution of citric acid drop by drop in the order of the phosphorus source, iron source, and sodium source. The addition rate is 15 mL / min, with vigorous stirring. After the addition is complete, let it stand for 24 hours;

[0062] (2) Pour the mixed emulsion treated in step (1) into a stainless steel reactor. The volume of the reactor is 150 mL and the filling volume is 66.67%. ...

Embodiment 3

[0066] This embodiment includes the following steps:

[0067] (1) This embodiment is designed to generate 0.03mol of the target product Na 2-2x Fe 1+x P 2 O 7 / Carbon composite material, to prepare 100mL solution: Weigh 1.634g glucose and dissolve it in 40mL ethylene glycol solution (the ratio of ethylene glycol to deionized water is 1:1), respectively weigh 0.06mol ammonium dihydrogen phosphate, 0.03 mol of ferric nitrate and 0.0315 mol of sodium carbonate were dissolved in 20 mL of deionized water, and stirred to dissolve. Add the phosphorus source, iron source, and sodium source to the alcohol solution of glucose drop by drop in the order of the phosphorus source, iron source, and sodium source, at a rate of 15mL / min, with vigorous stirring, and leave to stand for 24h after addition;

[0068] (2) Pour the mixed emulsion treated in step (1) into a stainless steel reactor. The volume of the reactor is 150 mL and the filling volume is 66.67%. The stainless steel reactor is placed i...

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Abstract

The invention discloses a Na<2-2x>Fe<1+x>P<2>O<7> / carbon composite material and a preparation method and an application thereof. The material is a composite material formed by coating the surfaces of Na<2-2x>Fe<1+x>P<2>O<7> particles with a carbon net layer. The synthesis method is simple, mild in condition and high in yield; and the prepared composite material has high specific capacity, high working voltage, good cycling stability and excellent rate capability when applied as a sodium-ion positive material.

Description

Technical field [0001] The present invention relates to a Na 2-2x Fe 1+x P 2 O 7 / Carbon composite material and its preparation method and application belong to the field of sodium ion batteries. Background technique [0002] With the rapid development of the Internet era, since the commercial production of lithium-ion batteries in the 1990s, lithium-ion batteries have achieved rapid development in the field of 3C products and electric vehicles, and have shown good development prospects. However, due to the scarcity of global metal lithium resources, the manufacturing cost of lithium-ion batteries is on the rise. At the same time, the development of lithium-ion batteries in the field of electric vehicles and large-scale energy storage has been greatly restricted due to poor safety. However, sodium is in the same main group as lithium in the periodic table, so it has very similar properties to lithium. And compared with the scarce lithium element, the sodium element has abundant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/583H01M4/62H01M10/054
CPCH01M4/362H01M4/525H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 张治安陈晓彬赖延清李劼史晓东张凯
Owner CENT SOUTH UNIV
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