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N-doped porous carbon/MoS2 sodium ion battery negative electrode material and preparation method thereof

A technology for nitrogen-doped porous carbon and sodium-ion batteries, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of MoS2 poor conductivity and unsatisfactory electrochemical performance, and achieve good cycle stability, Good ion transport ability and the effect of enriching the pore structure

Inactive Publication Date: 2017-11-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, MoS is currently synthesized by hydrothermal method 2 The nanosheets are still thicker, and the MoS 2 The electrical conductivity itself is poor, and the electrochemical performance is still not up to the ideal state

Method used

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  • N-doped porous carbon/MoS2 sodium ion battery negative electrode material and preparation method thereof
  • N-doped porous carbon/MoS2 sodium ion battery negative electrode material and preparation method thereof
  • N-doped porous carbon/MoS2 sodium ion battery negative electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] A nitrogen-doped porous carbon / MoS 2Anode materials for sodium-ion batteries, including conductive carbon cloth as a flexible substrate, a porous nitrogen-doped carbon nanowall array in the middle layer as a skeleton support, and MoS covered on the surface of the porous nitrogen-doped carbon nanowall array 2 Nanosheet group. It is prepared by the following steps:

[0042] Step 1: Preparation of nitrogen-doped porous carbon

[0043] (1) Mix the same volume of 0.4mol / L 2-methylimidazole aqueous solution with 50mmol / L Co(NO 3 ) 2 The aqueous solutions were mixed under stirring.

[0044] (2) Put the clean conductive carbon cloth flexible substrate in the container, and tilt it at an angle of 60° to the bottom of the container, and react at room temperature (25° C.) for 4 hours. After the reaction was finished, it was washed with deionized water and dried in air at 60° C. for 12 hours.

[0045] (3) The sample obtained in the step (2) was calcined at 800 ° C for 2 h in ...

Embodiment 2

[0052] A nitrogen-doped porous carbon / MoS 2 A negative electrode material for a sodium ion battery, which is made through the following steps:

[0053] (1) Mix the same volume of 0.3mol / L 2-methylimidazole aqueous solution with 30mmol / L Co(NO 3 ) 2 The aqueous solutions were mixed under stirring.

[0054] (2) Put the clean conductive carbon cloth flexible substrate in the container, and tilt it at an angle of 60° to the bottom of the container, and react for 2 hours at room temperature (25°C). After the reaction was finished, it was washed with deionized water and dried in air at 60° C. for 12 hours.

[0055] (3) The sample obtained in the step (2) was calcined at 800 ° C for 2 h in an Ar atmosphere, and the heating rate was 1 ° C min -1 , the airflow is 35sscm. After the reaction, the Co-MOF precursor was reduced to a mixture of metallic Co and nitrogen-doped carbon.

[0056] (4) The sample obtained in the step (3) is immersed in a mixed aqueous solution of 3mol / L ferri...

Embodiment 3

[0059] A nitrogen-doped porous carbon / MoS 2 A negative electrode material for a sodium ion battery, which is made through the following steps:

[0060] (1) Mix the same volume of 0.5mol / L 2-methylimidazole aqueous solution with 70mmol / L Co(NO 3 ) 2 The aqueous solutions were mixed under stirring.

[0061] (2) Put the clean conductive carbon cloth flexible substrate in the container, and tilt it at an angle of 60° to the bottom of the container, and react at room temperature (25° C.) for 5 hours. After the reaction was finished, it was washed with deionized water and dried in air at 60° C. for 12 hours.

[0062] (3) The sample obtained in the step (2) was calcined at 800 ° C for 2 h in an Ar atmosphere, and the heating rate was 1 ° C min -1 , the airflow is 35sscm. After the reaction, the Co-MOF precursor was reduced to a mixture of metallic Co and nitrogen-doped carbon.

[0063] (4) The sample obtained in the step (3) is immersed in a mixed aqueous solution of 3mol / L fer...

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Abstract

The invention relates to an N-doped porous carbon / MoS2 sodium ion battery negative electrode material and a preparation method thereof. The preparation method comprises the steps of firstly, selecting a conductive carbon fabric material as a flexible substrate, growing a Co-based metal organic frame (Co-MOF) nanometer wall array on a carbon fabric by a solution method, and performing high-temperature treatment in an inert gas (Ar atmosphere) environment to obtain a mixed material of metal Co and N-doped carbon; secondly, removing the metal Co with an acid solution to obtain a porous N-doped carbon nanometer wall array; and finally, synthesizing an ultrathin MoS2 nanosheet on a surface of the porous N-doped carbon nanometer wall array by a hydrothermal method to obtain the N-doped porous carbon / MoS2 sodium ion battery negative electrode material. Compared with the prior art, the porous N-doped porous carbon nanosheet array and ultrathin MoS2 nanosheet composite electrode material has excellent rate performance and cycle stability; according to the preparation method, the flexible carbon fabric substrate is used as a current collector; and the composite electrode material can be bent and folded and has good mechanical property, and no binding agent is needed.

Description

technical field [0001] The invention relates to the field of new energy technology electrochemical energy storage materials and devices, in particular to a nitrogen-doped porous carbon / MoS 2 Sodium ion battery negative electrode material and preparation method. Background technique [0002] Lithium-ion batteries are currently the most researched and commercialized high-efficiency battery system. However, with the increasing market demand for energy storage applications, the reserves and distribution of lithium-ion batteries in lithium resources, and the production costs and safety of batteries are becoming more and more important. Facing huge challenges. Therefore, it is necessary to develop alternative products for lithium-ion batteries. Sodium-ion batteries have become the most likely secondary batteries to replace lithium-ion batteries due to their rich sodium resources, high half-potential, and high safety. However, since the relative atomic mass and ionic radius of s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/505H01M4/58H01M10/054
CPCH01M4/362H01M4/505H01M4/5815H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 程传伟任伟娜
Owner TONGJI UNIV
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