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Sodium-ion-battery negative electrode material ferric sodium triphosphate and preparation method thereof

A sodium-ion battery, sodium iron triphosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of good crystallinity, simple preparation, and wide source of raw materials

Inactive Publication Date: 2018-05-15
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no literature report on the compound of sodium iron triphosphate, so there is no literature report on the application of this type of phosphate in the negative electrode material of sodium ion batteries.

Method used

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  • Sodium-ion-battery negative electrode material ferric sodium triphosphate and preparation method thereof
  • Sodium-ion-battery negative electrode material ferric sodium triphosphate and preparation method thereof
  • Sodium-ion-battery negative electrode material ferric sodium triphosphate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Na 2 CO 3 , FeC 2 o 4 2H 2 O and NH 4 h 2 PO 4 Weigh according to the stoichiometric ratio (molar ratio) of Na:Fe:P=1.15:4:3, mix evenly, and ball mill on a planetary ball mill for 4 hours;

[0033] Then, under an argon atmosphere, pretreatment was performed at 200°C for 10 hours, and after natural cooling, a powdery product was obtained;

[0034] The above-mentioned powdery product was ball-milled again in a planetary ball mill for 6 h, and the 2 Under atmosphere, sintering at 850°C for 10h to obtain sodium iron triphosphate [Na 1.15 Fe 4 (PO 4 ) 3 ] Anode material.

[0035] The XRD pattern of the product obtained in this embodiment is shown in figure 1 In a, it can be seen from the figure that pure-phase sodium iron triphosphate [Na 1.15 Fe 4 (PO 4 ) 3 ] Anode material. There is no impurity peak in the spectrogram, and the product has high purity.

Embodiment 2

[0037] Na 2 CO 3 , FeC 2 o 4 2H 2 O and NH 4 h 2 PO 4 Weigh according to the stoichiometric ratio (molar ratio) of Na:Fe:P=1.1:4:3, mix evenly, and ball mill on a planetary ball mill for 4 hours;

[0038] Then in Ar+5%H 2 Under air atmosphere, pretreatment was carried out at 300°C for 6 hours, and after natural cooling, a powdery product was obtained;

[0039] The pretreated product was added with 20wt% (relative to the powdered product) glucose (0.85g) as a carbon source, and ball milled again;

[0040] The above-mentioned powdery product was ball-milled again in a planetary ball mill for 6 h, under N 2 Sintering at 750°C for 20 h under air atmosphere to obtain sodium iron triphosphate [Na 1.1 Fe 4 (PO 4 ) 3 / C] anode material.

[0041] The XRD pattern of the product obtained in this embodiment is shown in figure 1 In b, it can be seen from the figure that pure phase carbon-coated sodium iron triphosphate [Na 1.1 Fe 4 (PO 4 ) 3 / C] anode material. There is...

Embodiment 3

[0043] Na 2 CO 3 , FeC 2 o 4 2H 2 O and NH 4 h 2 PO 4 Weigh according to the stoichiometric ratio (molar ratio) of Na:Fe:P=1.2:4:3, mix evenly, and ball mill on a planetary ball mill for 4 hours;

[0044] Then, under an argon atmosphere, pretreatment was carried out at 400°C for 2 hours, and after natural cooling, a powdery product was obtained;

[0045] Add 20wt% (relative to the powdered product) glucose (0.93g) to the pretreated product as a carbon source, and ball mill again;

[0046] The above-mentioned powdery product was ball-milled again in a planetary ball mill for 6 h, and the 2 Sintering at 800°C for 15 hours under air atmosphere to obtain sodium iron triphosphate [Na 1.1 Fe 4 (PO 4 ) 3 / C] anode material.

[0047] The XRD pattern of the product obtained in this embodiment is shown in figure 1 In c, it can be seen from the figure that pure phase carbon-coated sodium iron triphosphate [Na 1.2 Fe 4 (PO 4 ) 3 / C] anode material. There is no impurity ...

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Abstract

The invention discloses sodium-ion-battery negative electrode material ferric sodium triphosphate and a preparation method thereof. The method includes: sufficiently and evenly mixing sodium salt or the alkaline compound of the sodium, ferric salt or the oxide of iron and phosphate or theoxide precursor of phosphorus, performing preprocessing in reducing atmosphere or inert atmosphere at 200-400 DEG C, and processing in reducing atmosphere or inert atmosphere at 700-900 DEG C for 6-24 hours to obtain the ferric sodium triphosphate, wherein carbon materials are added during the precursor mixingor the processing (sintering reaction) to perform carbon wrapping on products. The preparation method has the advantages that the method is simple in process, easy to operate and applicable to the industrial production of the high-performance sodium-ion-battery negative electrode material ferric sodium triphosphate, the processing and the sintering can be performed in the reducing atmosphere or the inert atmosphere, and the obtained ferric sodium triphosphate is good in performance and hopefully becomes the next-generation sodium-ion-battery negative electrode material.

Description

technical field [0001] The invention relates to a negative electrode material for a sodium ion battery, in particular to a sodium iron triphosphate [Na x Fe 4 (PO 4 ) 3 (1.1≦x≦1.2)] and a preparation method thereof. Background technique [0002] Lithium-ion batteries with excellent electrochemical performance are currently the most mature and promising energy storage devices. They have been widely used in various small portable electronic devices, and gradually began to be used in large-scale devices such as hybrid vehicles and electric vehicles. . As the application fields of lithium-ion batteries become more and more extensive, the price of metallic lithium and the limitation of its resources have attracted people's attention. At the same time, since sodium and lithium are adjacent on the periodic table and are in the same main group, they have many similar physical and chemical properties. In addition, sodium is very rich in resources on the earth and widely distrib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/525H01M4/485H01M10/054
CPCH01M4/485H01M4/525H01M4/5825H01M10/054Y02E60/10
Inventor 赵彦明张辉邝泉
Owner SOUTH CHINA UNIV OF TECH
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