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Preparation method and application of sodium titanium phosphate/carbon composition material

A technology of carbon composite materials and sodium titanium phosphate, applied in the field of materials, can solve the problems of full release of electrochemical performance, general electrochemical performance, uneven fiber morphology, etc., achieve high fiber fineness and uniformity, and improve ion migration The effect of improving the rate and electrochemical performance

Inactive Publication Date: 2018-08-28
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the application number 106784696A discloses a sodium titanium phosphate / carbon composite material, its preparation method and application. The invention prepares the precursor of sodium titanium phosphate, and then uses the method of spray drying to carry out a carbon coating and Secondary carbon coating, the sodium titanium phosphate / carbon composite material with a uniform and dense coating carbon layer is obtained, and the material has excellent electrochemical new energy, but the application is to obtain a uniform carbon coating sodium titanium phosphate / The carbon composite material adopts two ball milling, spray drying and calcination processes, the preparation process is relatively troublesome, and the prepared products are micron-sized, and the large size is not conducive to the full release of electrochemical properties
In addition, the patent application with the application number 106571450A discloses an electrospinning method to prepare multi-layer flexible polyacrylonitrile / pitch carbon fiber composite materials for lithium-ion battery negative electrodes. The prepared material has good flexibility and can be used as a lithium-ion secondary battery. The negative electrode material has excellent specific volume and cycle stability, but the application forms multi-layer fibers through multiple spinning processes, the fiber morphology is uneven, and there are many spindles formed, and the electrochemical performance is general, and the current density of 100mA / g The following only gives a cycle of 100 laps

Method used

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  • Preparation method and application of sodium titanium phosphate/carbon composition material
  • Preparation method and application of sodium titanium phosphate/carbon composition material
  • Preparation method and application of sodium titanium phosphate/carbon composition material

Examples

Experimental program
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Embodiment 1

[0039] The preparation method of a kind of sodium titanium phosphate / carbon composite material described in this embodiment is prepared according to the following steps:

[0040] (1) Preparation of sodium titanium phosphate precursor solution: Take 10ml of absolute ethanol and add it to a beaker at room temperature, then heat it to 65°C and keep it at a constant temperature, weigh 0.68g of phosphorus pentoxide (P 2 o 5 ) into ethanol, continue to maintain a constant temperature of 65 ° C, and stir evenly to obtain a colorless solution 1; then weigh 2.14 g of isopropyl titanate with a mass concentration of 98%, add it to the above colorless solution 1, and continue to maintain 65 ° C Constant temperature, stir to obtain solution 2; Finally, weigh 0.53g of sodium acetate (CH 3 COONa) was added to solution 2, and continued to maintain a constant temperature of 65° C., and stirred evenly to obtain a sodium titanium phosphate precursor solution;

[0041] (2) Take 0.7g of polyviny...

Embodiment 2

[0051] The preparation method of a kind of sodium titanium phosphate / carbon composite material described in this embodiment is prepared according to the following steps:

[0052] (1) Preparation of sodium titanium phosphate precursor solution: Take 10ml of absolute ethanol and add it to the beaker at room temperature, then heat it to 20°C and keep it at a constant temperature, weigh 0.588g of phosphoric acid and add it to the ethanol, continue heating to 60°C at a constant temperature, Stir evenly to obtain a colorless solution 1; then weigh 0.681 g of tetrabutyl titanate with a mass concentration of 98%, add it to the above-mentioned colorless solution 1, continue to maintain a constant temperature of 60°C, and stir evenly to obtain a solution 2; finally weigh 0.106 Add 2 g of sodium carbonate to solution 2, continue to maintain a constant temperature of 60 ° C, and stir evenly to obtain a sodium titanium phosphate precursor solution;

[0053] (2) Take 0.25g polyvinylpyrrolid...

Embodiment 3

[0060] The preparation method of a kind of sodium titanium phosphate / carbon composite material described in this embodiment is prepared according to the following steps:

[0061] (1) Preparation of sodium titanium phosphate precursor solution: Take 10ml of absolute ethanol and add it to the beaker at room temperature, then heat it to 20°C and keep the temperature constant, weigh 0.691 ammonium dihydrogen phosphate and add it to the ethanol, heat it to 65°C Maintain a constant temperature and stir evenly to obtain a colorless solution 1; then weigh 0.1598g of titanium dioxide, add it to the above colorless solution 1, continue to maintain a constant temperature of 65°C, and stir evenly to obtain a solution 2; finally weigh 0.168g of sodium bicarbonate and add it to In solution 2, continue to maintain a constant temperature of 65°C and stir evenly to obtain a sodium titanium phosphate precursor solution;

[0062] (2) Take 1.0 g of polyvinylpyrrolidone (PVP), add it to the sodium...

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Abstract

The invention relates to a preparation method of a sodium titanium phosphate / carbon composition material and application thereof in sodium ion batteries and belongs to the technical field of materials. The preparation method comprises the steps: firstly, preparing a sodium titanium phosphate precursor and polyvinyl pyrrolidone mixed solution according to a proportion; then electrostatically spinning the mixed solution to prepare a carbon coated sodium titanium phosphate fiber precursor and drying the carbon coated sodium titanium phosphate fiber precursor; finally, calcining for 2 to 8 hours under a constant temperature of 700 to 900 DEG C to prepare the sodium titanium phosphate / carbon composition material. The size of sodium titanium phosphate in the composition material prepared by thepreparation method disclosed by the invention is 15 to 25nm, the diameter of the carbon based fiber is 200 to 250nm, electrochemical performance is greatly improved by a porous nano fiber structure, and the composition material can stably circulate for 500 to 1000 turns under the 500mA / g current density and further has high specific capacity. The preparation method disclosed by the invention has the advantages of simpleness and easiness in operation, small energy consumption, low manufacturing cost, high industrial degree, high stability and suitability for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to an electrode material. More specifically, the invention relates to a preparation method of sodium titanium phosphate / carbon composite material and its application in sodium ion batteries. Background technique [0002] Since the advent of lithium-ion batteries, it has become a research hotspot worldwide because of its clean and renewable alternatives to traditional fossil energy. However, the global lithium resources are not abundant, the content of lithium in the earth's crust is only 0.006%, and the distribution is uneven around the world, which also poses certain difficulties for development and use. Therefore, lithium-ion batteries will inevitably face resource shortage and high cost in the near future. Therefore, researchers urgently need to develop a new generation of energy storage batteries with better comprehensive performance to replace lithium-ion secondary batteries. ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054B82Y30/00
CPCB82Y30/00H01M4/362H01M4/5825H01M4/583H01M10/054Y02E60/10
Inventor 韩建涛魏鹏
Owner HUAZHONG UNIV OF SCI & TECH
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