Method of preparing TiO2-modified P/C composite anode material

A technology of titanium dioxide and negative electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low electrode utilization, poor cycle stability, and low practical ability, and achieve low price, good cycle performance, and simple preparation process Effect

Active Publication Date: 2019-02-01
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These conductive materials are usually electrochemically inert components such as Fe and Ni, resulting in low utilization of electrodes
In addition, most of the reported P-based materials have low practical capacity, fast capacity fading, and poor cycle stability due to the large reaction irreversibility caused by aggregation and pulverization, so more researches have been done on compounding red phosphorus with carbon materials to improve its stability.

Method used

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  • Method of preparing TiO2-modified P/C composite anode material
  • Method of preparing TiO2-modified P/C composite anode material
  • Method of preparing TiO2-modified P/C composite anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Titanium dioxide modified phosphorus / carbon composite negative electrode material I

[0023] Anthracite tailings (0.4 g) were ball milled with red phosphorus (0.6 g) and titanium dioxide (0.1 g) for 20 hours at a speed of 1200 rpm. After the materials were cooled and sieved, the negative electrode material for titanium dioxide modified phosphorus / carbon sodium ion batteries was obtained. figure 1 XRD pattern of the prepared titanium dioxide modified phosphorus / carbon composite anode material. It can be seen from the spectrum that the prepared titanium dioxide modified phosphorus / carbon negative electrode material is an amorphous material, and the main peak is still the diffraction peak of P. figure 2 The SEM photo of the prepared titanium dioxide modified phosphorus / carbon composite negative electrode material shows that the material has a granular structure with a diameter of about 0.1-1 micron. image 3 The high-resolution XPS P2p spectrum of the prepared...

Embodiment 2

[0025] Example 2: Titanium dioxide modified phosphorus / carbon composite negative electrode material II

[0026] Anthracite (0.4 g), red phosphorus (0.6 g), and titanium dioxide (0.1 g) were ball milled for 12 hours at a speed of 800 rpm. After the materials were cooled and sieved, the negative electrode material for titanium dioxide modified phosphorus / carbon sodium ion batteries was obtained. The electrode material test conditions are as described in Example 1, and titanium dioxide modified phosphorus / carbon is used as the negative electrode material of sodium ion battery, with 100 mA g -1 The current density is charged and discharged, and the first reversible capacity is 810 mAh g under the test voltage of 0-2.5 V -1 , with an initial Coulombic efficiency of 78.5%, and a reversible capacity of 620 mAh g after 80 cycles -1 .

Embodiment 3

[0027] Example 3: Titanium dioxide modified phosphorus / carbon composite negative electrode material III

[0028]Anthracite tailings (0.4 g), red phosphorus (0.6 g), and titanium dioxide (0.1 g) were ball milled for 8 hours at a speed of 600 rpm. After the materials were cooled and sieved, the negative electrode material for titanium dioxide modified phosphorus / carbon sodium ion batteries was obtained. The electrode material test conditions are as described in Example 1, and titanium dioxide modified phosphorus / carbon is used as the negative electrode material of sodium ion battery, with 100 mA g -1 The current density is charged and discharged, and the first reversible capacity is 786 mAh g under the test voltage of 0-2.5 V -1 , with an initial Coulombic efficiency of 75.6%, and a reversible capacity of 574 mAh g after 80 cycles -1 .

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Abstract

The invention discloses a method of preparing TiO2-modified P/C composite anode material and belongs to the field of electrochemical and new-energy materials. In the method, red phosphorus, anthraciteand nano-TiO2 are uniformly blended and then the mixture is mechanically ball-milled in a high-energy ball mill tank filled with inert gas, thus obtaining the TiO2-modified P/C composite anode material. Due to low cost of the anthracite, the method is suitable for low-cost large-scale production. The composite material is used as an anode of a sodium-ion battery and shows high reversible specificcapacity and great cycle stability. The method, as the anode of the sodium-ion battery, has certain application prospect.

Description

technical field [0001] The invention discloses a titanium dioxide modified phosphorus / carbon composite negative electrode material and a preparation method thereof, belonging to the fields of electrochemistry and new energy materials. technical background [0002] Electrochemical energy storage technology is a key component of future renewable energy-friendly grids with high energy efficiency, stability and adaptability. Na-ion batteries have the potential to compete with widely used lithium-ion batteries and change the landscape of electrochemical energy storage due to significant cost advantages and the abundance of sodium resources. Sodium and lithium are elements of the same main group and have similar physical and chemical properties, and sodium-ion batteries have a similar working principle to lithium-ion batteries. Due to the similar intercalation chemistry with LIB, including Na x NiO 2 , Na 2 / 3 Fe 1 / 2 mn 1 / 2 o 2 , Na 3 V 2 (PO 4 ) 3 and Na 3 V 2 (PO 4 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62
CPCH01M4/364H01M4/5825H01M4/625Y02E60/10
Inventor 陶华超张育坤李金航杨学林
Owner CHINA THREE GORGES UNIV
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