Sodium ion battery anode material FeS2/Fe3O4/C and preparation method of same

A sodium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low electrochemical performance and achieve good cycle performance, strong adaptability, and high Coulombic efficiency

Active Publication Date: 2017-12-22
江苏芯界新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrode is a solar cell transition metal sulfide counter electrode, and the electrochemical performance is low

Method used

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  • Sodium ion battery anode material FeS2/Fe3O4/C and preparation method of same
  • Sodium ion battery anode material FeS2/Fe3O4/C and preparation method of same
  • Sodium ion battery anode material FeS2/Fe3O4/C and preparation method of same

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Experimental program
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Effect test

Embodiment 1

[0039] A kind of sodium ion battery FeS 2 / Fe 3 o 4 The preparation method of / C negative electrode material, concrete steps are as follows:

[0040] (1) prepare 0.1mol / L lignosodium solution and ferric nitrate solution respectively;

[0041] (2) Measure the solution prepared in step (1) according to the molar ratio of Fe:S of 1:2, slowly add 20ml of ferric nitrate solution into 40ml of lignosodium solution, mix and stir for 1h until pH=3, and obtain Solution A;

[0042] (3) Put the solution A into the reactor, heat it at 180°C for 24 hours, cool it down to room temperature naturally, take out the mixture, and centrifuge to obtain a brown-black precipitate;

[0043] (4) drying the precipitate in step (3) at 60° C. for 2 hours to obtain a black powder, which is fully ground to obtain a composite material precursor;

[0044] (5) The precursor obtained in step (4) was calcined at 500°C for 6h under the protection of nitrogen atmosphere, and cooled naturally to room temperatu...

Embodiment 2

[0051] A kind of sodium ion battery FeS 2 / Fe 3 o 4 The preparation method of / C negative electrode material, concrete steps are as follows:

[0052] (1) prepare 0.1mol / L lignosodium solution and ferric nitrate solution respectively;

[0053] (2) Measure the solution prepared in step (1) according to the molar ratio of Fe:S of 1:1, slowly add 30ml ferric nitrate solution to 30ml lignosodium solution, mix and stir for 1h until pH=2, and obtain Solution A;

[0054] (3) Put the solution A into the reactor, heat it at 160°C for 48 hours, cool it down to room temperature naturally, take out the mixture, and centrifuge to obtain a brown-black precipitate;

[0055] (4) drying the precipitate in step (3) at 60° C. for 2 hours to obtain a black powder, which is fully ground to obtain a composite material precursor;

[0056] (5) The precursor obtained in step (4) is calcined at 400°C for 8 hours under the protection of nitrogen atmosphere, and cooled naturally to room temperature t...

Embodiment 3

[0059] A kind of sodium ion battery FeS 2 / Fe 3 o 4 The preparation method of / C negative electrode material, concrete steps are as follows:

[0060] (1) prepare 0.1mol / L lignosodium solution and ferric nitrate solution respectively;

[0061] (2) Measure the solution prepared in step (1) according to the molar ratio of Fe:S of 1:3, slowly add 15ml of ferric nitrate solution into 45ml of lignosodium solution, mix and stir for 1h until pH=4, and obtain Solution A;

[0062] (3) Put the solution A into the reactor, heat it at 200°C for 12 hours, cool it down to room temperature naturally, take out the mixture, and centrifuge to obtain a brown-black precipitate;

[0063] (4) drying the precipitate in step (3) at 60° C. for 2 hours to obtain a black powder, which is fully ground to obtain a composite material precursor;

[0064] (5) The precursor obtained in step (4) is calcined at 600°C for 4 hours under the protection of nitrogen atmosphere, and cooled naturally to room tempe...

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Abstract

The invention relates to a sodium ion battery anode material FeS2 / Fe3O4 / C and a preparation method of same. The method includes the steps of: 1) according to the molar ratio of Fe:S = 1:1-5, mixing an iron source solution and a sodium lignin sulfonate solution to form a solution A; 2) performing hydrothermal treatment to the solution A to form a brown-black precipitate; 3) drying and completely grinding the precipitate to form a composite material precursor; 4) in an atmosphere of a protective gas, calcining the precursor to obtain the FeS2 / Fe3O4 / C composite material. The composite material, as a sodium ion battery anode material, has high Coulombic efficiency, is good in cycle performance and has strong adaptability in electrolytes. When being charged / discharged under charge / discharge voltage of 0.01-3.0 V and 1 A / g, after 100 cycles, the sodium ion battery has basically constant specific discharge capacity, so that the sodium ion battery anode material can satisfy demands on high-rate power batteries on market. The preparation method has simple preparation process and low cost.

Description

technical field [0001] The invention relates to a sodium ion battery FeS 2 / Fe 3 o 4 The / C negative electrode material and a preparation method thereof belong to the technical field of sodium ion battery negative electrode materials. Background technique [0002] The main component of pyrite ore is iron disulfide (FeS 2 ), due to pyrite (FeS 2 ) has the advantages of abundant resources, low cost, non-toxicity and high theoretical specific capacity, making it a promising electrode material for sodium-ion batteries, but because the intermediate polysulfides formed during the cycle will dissolve in the electrolyte , reducing the reversibility and conductivity of the battery, which in turn leads to a decrease in electrochemical performance. [0003] Fe 3 o 4 It has the advantages of abundant content in nature, low cost, and environmental friendliness. However, as transition metal oxides used as electrode materials, there are problems such as low charge-discharge Coulombi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/48H01M4/58H01M10/054
CPCH01M4/48H01M4/525H01M4/5815H01M10/054Y02E60/10
Inventor 何文王春莲张旭东
Owner 江苏芯界新能源科技有限公司
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