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Transition metal phosphide/porous carbon anode composite material for sodium-ion battery and preparation method thereof

A technology of sodium ion batteries and porous carbon materials, which is applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of reducing the cycle stability of electrode materials, reducing the rate performance of electrode materials, and volume changes, etc. Prospects for industrial application, improved cycle stability, rate performance, and good repeatability

Inactive Publication Date: 2016-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, metal phosphides have high theoretical sodium storage capacity as anode materials for sodium ion batteries, but their low conductivity reduces their rate performance as electrode materials; in addition, due to their conversion reaction mechanism with sodium ions, During the intercalation / extraction of sodium ions, serious volume changes and defects such as electrode pulverization will occur, which greatly reduces its cycle stability as an electrode material.

Method used

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  • Transition metal phosphide/porous carbon anode composite material for sodium-ion battery and preparation method thereof
  • Transition metal phosphide/porous carbon anode composite material for sodium-ion battery and preparation method thereof
  • Transition metal phosphide/porous carbon anode composite material for sodium-ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] First weigh 1.71g of copper chloride dihydrate to fully dissolve it in 200mL of dimethylformamide solution, then weigh 12.6g of 1,3,5-trimellitic acid and slowly add it to the above solution under magnetic stirring , after stirring evenly, transfer the obtained mixed solution to a stainless steel hydrothermal reaction kettle, and conduct a hydrothermal reaction at 180°C. After reacting for 16 hours, the resulting precipitate is repeatedly washed with methanol and dimethylformamide, and dried to obtain copper Precursors of metal-organic framework materials.

[0046] Weigh 0.5g copper-based metal organic framework material and 1g sodium dihydrogen hypophosphite, pour the two into the corundum porcelain boat, and place the two porcelain boats in the downwind direction and upwind direction of the vacuum tube furnace respectively, and then , the temperature of the tube furnace was raised to 500°C by introducing argon gas, and after fully reacting for 6 hours, the resulting r...

Embodiment 2

[0053] First weigh 1.71g of copper chloride dihydrate to fully dissolve it in 200mL of dimethylformamide solution, then weigh 12.6g of 1,3,5-trimellitic acid and slowly add it to the above solution under magnetic stirring , after stirring evenly, transfer the obtained mixed solution to a stainless steel hydrothermal reaction kettle, and conduct a hydrothermal reaction at 180°C. After reacting for 16 hours, the resulting precipitate is repeatedly washed with methanol and dimethylformamide, and dried to obtain copper Precursors of metal-organic framework materials.

[0054] Weigh 0.5g copper-based metal organic framework material and 0.25g sodium dihydrogen hypophosphite, pour the two into the corundum porcelain boat, and place the two porcelain boats in the downwind direction and upwind direction of the vacuum tube furnace respectively, Subsequently, the temperature of the tube furnace was raised to 500°C by introducing argon gas, and after fully reacting for 6 hours, the resul...

Embodiment 3

[0058] First weigh 1.71g of copper chloride dihydrate to fully dissolve it in 200mL of dimethylformamide solution, then weigh 12.6g of 1,3,5-trimellitic acid and slowly add it to the above solution under magnetic stirring , after stirring evenly, transfer the obtained mixed solution to a stainless steel hydrothermal reaction kettle, and conduct a hydrothermal reaction at 180°C. After reacting for 16 hours, the resulting precipitate is repeatedly washed with methanol and dimethylformamide, and dried to obtain copper Precursors of metal-organic framework materials.

[0059] Weigh 0.5g copper-based metal organic framework material and 2g sodium dihydrogen hypophosphite, pour the two into the corundum porcelain boat, and place the two porcelain boats in the downwind direction and upwind direction of the vacuum tube furnace respectively, and then , the temperature of the tube furnace was raised to 500°C by introducing argon gas, and after fully reacting for 6 hours, the resulting r...

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Abstract

The invention discloses a transition metal phosphide / porous carbon anode composite material for a sodium-ion battery and a preparation method thereof. The composite material is formed by dispersive distribution of transition metal phosphide nano-particles in a porous carbon material. A preparation process of the composite material comprises the following steps of preparing a transition metal organic frame structure by transition metal salt and organic ligands through an in-situ growth method; respectively placing the transition metal organic frame structure and a phosphorus source on two ends of a tube furnace, heating the tube furnace, and meanwhile, circulating liquid inert gas into one end of the tube furnace with the inorganic phosphorus source to carry out heat treatment; and washing and drying a heat treatment product in sequence to obtain the composite material. The prepared transition metal phosphide / porous carbon anode composite material used as the anode material of the sodium-ion battery has high specific capacity, good rate capability, simple preparation method, low cost and wide industrial application prospect.

Description

technical field [0001] The invention relates to a negative electrode material for a sodium ion battery and a preparation method thereof, in particular to a transition metal phosphide / porous carbon negative electrode composite material for a sodium ion battery and a preparation method thereof, belonging to the field of sodium ion batteries. Background technique [0002] Since the advent of new chemical power lithium-ion batteries in the 1980s, as the third generation of rechargeable batteries, they have attracted much attention due to their advantages such as high specific energy, stable cycle performance, high working voltage, long service life and low environmental pollution. Used in hybrid electric vehicles and mobile electronic devices. However, due to the relatively small elemental content of lithium in the earth's crust, it is necessary to develop a new type of battery system. [0003] Sodium-ion batteries are a new type of energy storage system that has been widely st...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/58H01M4/62B82Y30/00H01M10/054
CPCB82Y30/00H01M4/364H01M4/5805H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 张治安史晓东陈晓彬尹盟李天凡解豪潘迪李天伟于航
Owner CENT SOUTH UNIV
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