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

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...

Examples

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...

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...

Examples

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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