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Sodium ion battery negative electrode material and preparation method thereof

A sodium ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low conductivity, volume expansion, etc., and achieve the effect of shortening the diffusion distance

Active Publication Date: 2019-06-14
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a negative electrode material for a sodium ion battery and a preparation method thereof in view of the volume expansion and low conductivity of the metal selenide negative electrode material of the existing sodium ion battery during charging and discharging. The synthesized hollow core-shell structure and stable morphology can provide high specific surface area for electrolyte contact, shorten the diffusion length of sodium ions, and inhibit the expansion of the material during charge and discharge.

Method used

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  • Sodium ion battery negative electrode material and preparation method thereof
  • Sodium ion battery negative electrode material and preparation method thereof
  • Sodium ion battery negative electrode material and preparation method thereof

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Embodiment 1

[0032] The negative electrode material of the sodium ion battery is iron-based selenide FeSe 2 @C.

[0033] The preparation method of the negative electrode material of the sodium ion battery comprises the following steps:

[0034] (1) Preparation of iron-based metal framework precursor Fe-MIL-88A: Measure 8mL DMF (dimethylformamide) into a round bottom flask, then add 0.16g Fe(NO 3 ) 3 . 9H 2 O and 0.042g fumaric acid were stirred for 30min; after stirring evenly, transferred to an oil bath at 110°C for reaction for 1h, washed with DMF and methanol for 3 times after the reaction, and dried in an oven at 70°C for subsequent use;

[0035] (2) Preparation of Fe 2 o3 @PDA (p-phenylenediamine): The iron-based metal framework precursor Fe-MIL-88A and dopamine prepared in step (1) were added to the Tris buffer with a pH value of 8.5 and a concentration of 10 mmol / L and stirred for 6 hours. Among them, the mass ratio of iron-based metal framework precursor Fe-MIL-88A: dopamine ...

Embodiment 2

[0043] The preparation method of the negative electrode material of the sodium ion battery comprises the following steps:

[0044] (1) Preparation of iron-based metal framework precursor Fe-MIL-88A: Measure 8mL DMF (dimethylformamide) into a round bottom flask, then add 0.16g Fe(NO 3 ) 3 . 9H 2 O and 0.042g fumaric acid were stirred for 30min; after stirring evenly, transferred to an oil bath at 110°C for reaction for 1h, washed with DMF and methanol for 3 times after the reaction, and dried in an oven at 70°C for subsequent use;

[0045] (2) Preparation of Fe 2 o 3 @PDA (p-phenylenediamine): The iron-based metal framework precursor Fe-MIL-88A and dopamine prepared in step (1) were added to the Tris buffer with a pH value of 8.5 and a concentration of 10 mmol / L and stirred for 6 hours. Among them, the mass ratio of iron-based metal framework precursor Fe-MIL-88A: dopamine is 1:1; then the centrifuge is centrifuged at a speed of 10,000 rpm and the product is collected, was...

Embodiment 3

[0049] The preparation method of the negative electrode material of the sodium ion battery comprises the following steps:

[0050] (1) Preparation of iron-based metal framework precursor Fe-MIL-88A: Measure 8mL DMF (dimethylformamide) into a round bottom flask, then add 0.16g Fe(NO 3 ) 3 . 9H 2 O and 0.042g fumaric acid were stirred for 30min; after stirring evenly, transferred to an oil bath at 110°C for reaction for 1h, washed with DMF and methanol for 3 times each after the reaction, and dried in an oven at 70°C for subsequent use;

[0051] (2) Preparation of Fe 2 o 3 @PDA (p-phenylenediamine): The iron-based metal framework precursor Fe-MIL-88A and dopamine prepared in step (1) were added to the Tris buffer with a pH value of 8.5 and a concentration of 10 mmol / L and stirred for 6 hours. Among them, the mass ratio of iron-based metal framework precursor Fe-MIL-88A: dopamine is 1:0.5; then the centrifuge is centrifuged at a speed of 10,000 rpm and the product is collect...

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Abstract

The invention belongs to the technical field of sodium ion batteries and particularly relates to a sodium ion battery negative electrode material and a preparation method thereof. The negative electrode material is an iron-based selenide FeSe2@C. The negative electrode material has a controllably synthesized hollow core-shell structure and stable morphology, high specific surface area can be provided for electrolyte contact, the diffusion length of sodium ions can be shortened, and the expansion of the material can be inhibited in the charging and discharging process. According to the materialand the method in the invention, volume expansion of the sodium ion battery negative electrode material prepared in the prior art in the charging and discharging process is overcome, the stability performance of the battery is effectively improved, and the cycling performance and the coulombic efficiency of the sodium ion battery are improved.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a negative electrode material of a sodium ion battery and a preparation method thereof. Background technique [0002] With the rapidly growing demand for large-scale energy storage devices, various electrochemical energy conversion systems including lithium-ion batteries (LIBs), supercapacitors, and metal-air batteries have been discovered, among which among all battery systems, lithium-ion batteries have been It has been used commercially for many years, but there are problems such as the uneven distribution of lithium metal on the earth and the high price. In recent years, sodium-ion batteries have attracted the interest of researchers due to their low price and wide distribution on the earth. However, graphite is limited as a negative electrode material for sodium-ion batteries, mainly because the radius of sodium ions is much larger than that of lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCY02E60/10
Inventor 董玉成林叶茂
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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