A kind of Fe3O4/C composite material for negative electrode material of lithium ion battery and its preparation method and application

Abstract

The invention provides an Fe3O4 / C composite material for an anode material of a lithium-ion battery and a preparation method and an application of the Fe3O4 / C composite material. The preparation method comprises the following steps: preparing a biomaterial / iron-ion compound gel from the biomaterial and a ferric salt as raw materials; and preparing a biomaterial / iron-ion composite filament and preparing the Fe3O4 / C composite material; particularly, injecting viscous and uniform gel into an iron-in solution to form filiform gel; removing moisture in the gel through a freeze-drying method to obtain a tawny filament; and carrying out high-temperature calcination and carbonization on a dried product in an inert atmosphere to obtain the Fe3O4 / C composite material. The method provided by the invention is simple in technology; and an electrode which is coated after compounding the prepared Fe3O4 / C composite material, carbon powder and polyvinylidene fluoride has relatively good rate capability and initial specific capacity.

Description

technical field

[0001] The invention belongs to the field of lithium ion battery materials and relates to a Fe 3 o 4 / C composite material and its preparation method and application, especially relate to a kind of Fe for negative electrode material of lithium ion battery 3 o 4 / C composite material and its preparation method and application. Background technique

[0002] Rechargeable lithium-ion batteries are one of the most efficient energy storage devices available today and find wide applications in portable electronics, electric vehicles, and backup power. People's excessive dependence on energy and damage to the environment have greatly promoted the development and utilization of lithium-ion batteries. It is currently a huge challenge to develop lithium-ion battery energy storage devices with high power and high energy. . As an important part of lithium-ion batteries, the performance of electrode materials is ultimately related to the use effect and energy storage ...

Examples

Embodiment 1

[0057] (1) Preparation of biomaterial / iron ion composite gel:

[0058] Disperse 2g of agar evenly in 98mL of deionized water under stirring conditions, stir and dissolve at room temperature to form an agar solution (2wt%), then inject the agar solution into a concentration of 1mol / L nitric acid under the condition of 0.45MPa In the iron solution, a filamentous agar / iron ion composite gel was obtained.

[0059] (2) Preparation of biological material / iron ion composite filament:

[0060] Place the agar / iron ion composite gel in a ferric nitrate solution with a concentration of 1mol / L for 10h, then take it out and freeze-dry it at -40°C for 4 days to obtain a yellow-brown agar / iron ion composite filament. Its shape is as figure 1 shown.

[0061] (3) Preparation of Fe 3 o 4 / C composite material:

[0062] The agar / iron ion composite filaments were calcined at 400°C for 1 h in an argon atmosphere. After calcining, they were taken out and acidified in a hydrochloric acid solut...

Embodiment 2

[0066] (1) Preparation of biomaterial / iron ion composite gel:

[0067] Under stirring condition, 2g agar is uniformly dispersed in 198mL deionized water, stirred and dissolved at room temperature to form an agar solution (1wt%), and then the agar solution is injected into a concentration of 1mol / L nitric acid under the condition of a pressure of 0.45MPa In the iron solution, a filamentous agar / iron ion composite gel was obtained.

[0068] (2) Preparation of biological material / iron ion composite filament:

[0069] The agar / iron ion composite gel was placed in a ferric nitrate solution with a concentration of 1 mol / L for 10 hours, and then taken out and freeze-dried at -40°C for 3 days to obtain a yellow-brown agar / iron ion composite filament.

[0070] (3) Preparation of Fe 3 o 4 / C composite material:

[0071] The agar / iron ion composite filaments were calcined at 400°C for 1 h in an argon atmosphere. After calcining, they were taken out and acidified in a hydrochloric aci...

Embodiment 3

[0074] (1) Preparation of biomaterial / iron ion composite gel:

[0075] Under stirring condition, 2g agar is uniformly dispersed in 98mL deionized water, stirred and dissolved at room temperature to form an agar solution (2wt%), and then the agar solution is injected into the concentration of 0.2mol / L under the condition of 0.45MPa. In the ferric nitrate solution, a filamentous agar / iron ion composite gel was obtained.

[0076] (2) Preparation of biological material / iron ion composite filament:

[0077] Place the agar / iron ion composite gel in a ferric nitrate solution with a concentration of 0.2mol / L for 10 hours, then take it out and freeze-dry it at -40°C for 5 days to obtain a yellow-brown agar / iron ion composite filament .

[0078] (3) Preparation of Fe 3 o 4 / C composite material:

[0079] The agar / iron ion composite filaments were calcined at 400°C for 1 h in an argon atmosphere. After calcining, they were taken out and acidified in a hydrochloric acid solution with...

technical field

[0001] The invention belongs to the field of lithium ion battery materials and relates to a Fe 3 o 4 / C composite material and its preparation method and application, especially relate to a kind of Fe for negative electrode material of lithium ion battery 3 o 4 / C composite material and its preparation method and application. Background technique

[0002] Rechargeable lithium-ion batteries are one of the most efficient energy storage devices available today and find wide applications in portable electronics, electric vehicles, and backup power. People's excessive dependence on energy and damage to the environment have greatly promoted the development and utilization of lithium-ion batteries. It is currently a huge challenge to develop lithium-ion battery energy storage devices with high power and high energy. . As an important part of lithium-ion batteries, the performance of electrode materials is ultimately related to the use effect and energy storage ...

Examples

Embodiment 1

[0057] (1) Preparation of biomaterial / iron ion composite gel:

[0058] Disperse 2g of agar evenly in 98mL of deionized water under stirring conditions, stir and dissolve at room temperature to form an agar solution (2wt%), then inject the agar solution into a concentration of 1mol / L nitric acid under the condition of 0.45MPa In the iron solution, a filamentous agar / iron ion composite gel was obtained.

[0059] (2) Preparation of biological material / iron ion composite filament:

[0060] Place the agar / iron ion composite gel in a ferric nitrate solution with a concentration of 1mol / L for 10h, then take it out and freeze-dry it at -40°C for 4 days to obtain a yellow-brown agar / iron ion composite filament. Its shape is as figure 1 shown.

[0061] (3) Preparation of Fe 3 o 4 / C composite material:

[0062] The agar / iron ion composite filaments were calcined at 400°C for 1 h in an argon atmosphere. After calcining, they were taken out and acidified in a hydrochloric acid solut...

Embodiment 2

[0066] (1) Preparation of biomaterial / iron ion composite gel:

[0067] Under stirring condition, 2g agar is uniformly dispersed in 198mL deionized water, stirred and dissolved at room temperature to form an agar solution (1wt%), and then the agar solution is injected into a concentration of 1mol / L nitric acid under the condition of a pressure of 0.45MPa In the iron solution, a filamentous agar / iron ion composite gel was obtained.

[0068] (2) Preparation of biological material / iron ion composite filament:

[0069] The agar / iron ion composite gel was placed in a ferric nitrate solution with a concentration of 1 mol / L for 10 hours, and then taken out and freeze-dried at -40°C for 3 days to obtain a yellow-brown agar / iron ion composite filament.

[0070] (3) Preparation of Fe 3 o 4 / C composite material:

[0071] The agar / iron ion composite filaments were calcined at 400°C for 1 h in an argon atmosphere. After calcining, they were taken out and acidified in a hydrochloric aci...

Embodiment 3

[0074] (1) Preparation of biomaterial / iron ion composite gel:

[0075] Under stirring condition, 2g agar is uniformly dispersed in 98mL deionized water, stirred and dissolved at room temperature to form an agar solution (2wt%), and then the agar solution is injected into the concentration of 0.2mol / L under the condition of 0.45MPa. In the ferric nitrate solution, a filamentous agar / iron ion composite gel was obtained.

[0076] (2) Preparation of biological material / iron ion composite filament:

[0077] Place the agar / iron ion composite gel in a ferric nitrate solution with a concentration of 0.2mol / L for 10 hours, then take it out and freeze-dry it at -40°C for 5 days to obtain a yellow-brown agar / iron ion composite filament .

[0078] (3) Preparation of Fe 3 o 4 / C composite material:

[0079] The agar / iron ion composite filaments were calcined at 400°C for 1 h in an argon atmosphere. After calcining, they were taken out and acidified in a hydrochloric acid solution with...

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