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Three-dimensional composite negative electrode material for sodium-ion battery and preparation method and application of three-dimensional composite negative electrode material

A sodium-ion battery, three-dimensional composite technology, applied in battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc., can solve problems such as low output and complicated preparation process, and achieve high discharge capacity and high reversible ratio Capacity, the effect of promoting rapid transfer

Inactive Publication Date: 2021-07-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a three-dimensional composite negative electrode material for sodium ion batteries to solve the problems of complex preparation process and low output of negative electrode materials for sodium ion batteries in the prior art

Method used

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  • Three-dimensional composite negative electrode material for sodium-ion battery and preparation method and application of three-dimensional composite negative electrode material
  • Three-dimensional composite negative electrode material for sodium-ion battery and preparation method and application of three-dimensional composite negative electrode material
  • Three-dimensional composite negative electrode material for sodium-ion battery and preparation method and application of three-dimensional composite negative electrode material

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Embodiment 1

[0049] The three-dimensional composite negative electrode material of the sodium ion battery of the present embodiment has a lamellar structure, including reduced graphene oxide sheets and FePS attached to the reduced graphene oxide sheets 3 .

[0050] The preparation method of the three-dimensional composite negative electrode material of the sodium ion battery of the present embodiment comprises the following steps:

[0051] (1) Mix iron powder, red phosphorus powder and sublimed sulfur according to the molar ratio of 1:1:3, grind them thoroughly, and then seal them in a quartz ampoule under vacuum conditions (vacuum degree is 10 -6 mbar), heated to 750 °C at a heating rate of 1 °C / min in a muffle furnace and sintered for 6 days to obtain bulk FePS 3 crystal;

[0052] (2) The prepared bulk FePS 3 The crystal is placed in a quartz tube, and in an argon atmosphere, the temperature is raised to 500 °C at a rate of 2 °C / min and calcined for 2 h for annealing treatment to obta...

Embodiment 2

[0058] The three-dimensional composite negative electrode material of the sodium ion battery of the present embodiment has a lamellar structure, including reduced graphene oxide sheets and FePS attached to the reduced graphene oxide sheets 3 .

[0059] The preparation method of the three-dimensional composite negative electrode material of the sodium ion battery of the present embodiment comprises the following steps:

[0060] (1) Mix iron powder, red phosphorus powder and sublimed sulfur according to the molar ratio of 1:1:3, grind them thoroughly, and then seal them in a quartz ampoule under vacuum conditions (vacuum degree is 10 -6 mbar), heated to 750 °C at a heating rate of 1 °C / min in a muffle furnace and sintered for 6 days to obtain bulk FePS 3 crystal;

[0061] (2) The prepared bulk FePS 3 The crystal is placed in a quartz tube, and in an argon atmosphere, the temperature is raised to 500 °C at a rate of 2 °C / min and calcined for 2 h for annealing treatment to obta...

Embodiment 3

[0067] The three-dimensional composite negative electrode material of the sodium ion battery of the present embodiment has a lamellar structure, including reduced graphene oxide sheets and FePS attached to the reduced graphene oxide sheets3 .

[0068] The preparation method of the three-dimensional composite negative electrode material of the sodium ion battery of the present embodiment comprises the following steps:

[0069] (1) Mix iron powder, red phosphorus powder and sublimed sulfur according to the molar ratio of 1:1:3, grind them thoroughly, and then seal them in a quartz ampoule under vacuum conditions (vacuum degree is 10 -6 mbar), heated to 750 °C at a heating rate of 1 °C / min in a muffle furnace and sintered for 6 days to obtain bulk FePS 3 crystal;

[0070] (2) The prepared bulk FePS 3 The crystal is placed in a quartz tube, and in an argon atmosphere, the temperature is raised to 500 °C at a rate of 2 °C / min and calcined for 2 h for annealing treatment to obtain...

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Abstract

The invention belongs to the technical field of sodium-ion batteries, and particularly discloses a three-dimensional composite negative electrode material of a sodium-ion battery as well as a preparation method and application of the three-dimensional composite negative electrode material. The three-dimensional composite negative electrode material FePS3 / rGO of the sodium ion battery has a lamellar structure, and tiny FePS3 nanosheets are uniformly attached to the surface of a rGO lamellar layer. FePS3 is a ternary transition metal phosphorus sulfide and has a special two-dimensional layered structure, the layers are combined by Van der Waals force, and the structure is beneficial to the rapid movement and storage of sodium ions between the layers. According to the present invention, FePS3 and rGO are compounded, so that volume expansion of the FePS3 material in a reaction process is effectively buffered, the rapid transfer of electrons / ions is promoted, and a longer cycle life can be realized on the premise of keeping higher specific capacity. Meanwhile, the improvement of the stability of a material system also greatly enhances the rate capability of the material, and the sodium ion battery prepared from the material has high discharge capacity and excellent rate capability.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a three-dimensional composite negative electrode material for a sodium ion battery, a preparation method and application thereof. Background technique [0002] Since the first commercial application of lithium-ion batteries in 1991, it has been widely used and developed as an efficient energy storage device in the past 30 years. However, with the increasing demand for electric vehicles and large-scale energy storage, lithium resources are limited due to their limited resources. Therefore, Na-ion batteries are expected to be cheaper energy storage systems due to their similar energy storage properties and the abundance of Na resources. However, according to thermodynamic calculations, most carbon materials are not suitable as negative electrode materials for sodium-ion batteries, while alloy materials and conversion materials are based on the mechanism of ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/5805H01M4/5815H01M4/625H01M4/628H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 彭生杰连欣彤丁永豪李林林
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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