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a kind of na 2‑2x fe 1+x p 2 o 7 /Carbon composite material and its preparation method and application

A carbon composite material and carbon source technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of low voltage platform and short cycle life, and achieve the goal of reducing impurity phases, less impurity phases, and high activity Effect

Active Publication Date: 2018-02-16
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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  • a kind of na <sub>2‑2x</sub> fe <sub>1+x</sub> p <sub>2</sub> o <sub>7</sub> /Carbon composite material and its preparation method and application
  • a kind of na <sub>2‑2x</sub> fe <sub>1+x</sub> p <sub>2</sub> o <sub>7</sub> /Carbon composite material and its preparation method and application
  • a kind of na <sub>2‑2x</sub> fe <sub>1+x</sub> p <sub>2</sub> o <sub>7</sub> /Carbon composite material and its preparation method and application

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Embodiment 1

[0050] This embodiment includes the following steps:

[0051] (1) The design of this embodiment generates 0.03mol target product Na 2-2x Fe 1+x P 2 o 7 100mL solution: Weigh 0.827g of glucose and dissolve it in 40mL of ethylene glycol solution (the ratio of ethylene glycol to deionized water is 1:1), weigh 0.06mol of ammonium dihydrogen phosphate and 0.03mol of nitric acid Iron and 0.0315mol of sodium carbonate were dissolved in 20mL of deionized water respectively, and stirred to dissolve. According to the sequence of phosphorus source, iron source and sodium source, it was added dropwise to the alcohol solution of glucose at a rate of 15 mL / min, supplemented by vigorous stirring, and left to stand for 24 hours after the addition was completed;

[0052] (2) Pour the mixed emulsion treated in step (1) into a stainless steel reaction kettle with a volume of 150mL and a filling capacity of 66.67%. Put the stainless steel reaction kettle into a 150°C constant temperature dryi...

Embodiment 2

[0060] This embodiment includes the following steps:

[0061] (1) The design of this embodiment generates 0.03mol target product Na 2-2x Fe 1+x P 2 o 7 / carbon composite material, prepare solution 100mL: weigh 1.634g of citric acid and dissolve it in 40mL of ethylene glycol solution (the ratio of ethylene glycol to deionized water is 1:1), weigh 0.06mol of ammonium dihydrogen phosphate respectively , 0.03mol of ferric nitrate and 0.0315mol of sodium carbonate were dissolved in 20mL of deionized water and stirred to dissolve. According to the order of phosphorus source, iron source and sodium source, add it dropwise to the alcohol solution of citric acid at a rate of 15mL / min, supplemented by vigorous stirring. After the addition is completed, let stand and age for 24 hours;

[0062] (2) Pour the mixed emulsion treated in step (1) into a stainless steel reaction kettle with a volume of 150mL and a filling capacity of 66.67%. Put the stainless steel reaction kettle into a 1...

Embodiment 3

[0066] This embodiment includes the following steps:

[0067] (1) The design of this embodiment generates 0.03mol target product Na 2-2x Fe 1+x P 2 o 7 / carbon composite material, preparation solution 100mL: weigh 1.634g of glucose and dissolve it in 40mL of ethylene glycol solution (the ratio of ethylene glycol to deionized water is 1:1), weigh 0.06mol of ammonium dihydrogen phosphate respectively, 0.03mol of ferric nitrate and 0.0315mol of sodium carbonate were respectively dissolved in 20mL of deionized water and stirred to dissolve. According to the order of phosphorus source, iron source, and sodium source, add it dropwise to the alcohol solution of glucose at a rate of 15mL / min, supplemented by vigorous stirring, and leave it to stand for 24 hours after the addition is completed;

[0068](2) Pour the mixed emulsion treated in step (1) into a stainless steel reaction kettle with a volume of 150mL and a filling capacity of 66.67%. Put the stainless steel reaction kett...

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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 kind of Na 2-2x Fe 1+x P 2 o 7 The invention discloses a carbon / carbon composite material and a preparation method and application thereof, belonging 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 shortage of lithium metal resources in the world, the manufacturing cost of lithium-ion batteries is on the rise. At the same time, due to the poor safety of lithium-ion batteries, their development in the field of electric vehicles and large-scale energy storage has been greatly restricted. However, sodium, which is in the same main group as lithium in the periodic table, has very similar properties to lithium. And ...

Claims

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Application Information

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Patent Type & Authority Patents(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