FeS<2-x>Sex solid solution cathode material and preparation method thereof

A cathode material and solid solution technology, which is applied in the field of FeS2-xSex solid solution cathode material and its preparation, can solve the problems of poor cycle stability of cathode materials, and achieve the effects of improving cycle stability, good buffer capacity and improving utilization rate.

Inactive Publication Date: 2020-08-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned problems existing in the prior art, the present invention provides a kind of FeS 2-x Se x Solid solution positive electrode material

Method used

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  • FeS&lt;2-x&gt;Sex solid solution cathode material and preparation method thereof
  • FeS&lt;2-x&gt;Sex solid solution cathode material and preparation method thereof
  • FeS&lt;2-x&gt;Sex solid solution cathode material and preparation method thereof

Examples

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Embodiment 1

[0032] a FeS 2-x Se x Solid solution positive electrode material, its preparation method comprises the following steps:

[0033] (1) Add 1mmol iron oxalate and 0.3g PAN to 10ml DMF in turn, and stir at 800r / min at 25°C for 12h to obtain a uniformly dispersed spinning solution;

[0034] (2) By electrospinning, the spinning solution obtained in step (1) is spun into nanofibers distributed with iron precursors, and then heated to 1000°C at a heating rate of 10°C / min for 3 hours, and samples are collected after cooling;

[0035] (3) 2mmol S powder and 1mmol Se ball milled for 12h to obtain uniform mixing;

[0036] (4) Place the small porcelain boat with evenly mixed Se and S powders and another small porcelain boat with nanofiber precursors in the tube furnace, and place the small porcelain boats with evenly mixed Se and S powders close to At one end of the vent, raise the temperature at a rate of 5 °C / min to 300 °C for 2 hours; then increase the rate of temperature at 5 °C / min...

Embodiment 2

[0039] a FeS 2-x Se x Solid solution positive electrode material, its preparation method comprises the following steps:

[0040] (1) Add 1mmol iron oxalate and 0.4g PAN to 10ml DMF in sequence, and stir at 800r / min at 25°C for 12h to obtain a uniformly dispersed spinning solution;

[0041] (2) By electrospinning, the spinning solution obtained in step (1) is spun into nanofibers distributed with iron precursors, and then heated to 1000°C at a heating rate of 10°C / min for 3 hours, and samples are collected after cooling;

[0042] (3) Ball mill 3mmol S powder and 1.5mmol Se for 12h to obtain a homogeneous mixture;

[0043] (4) Place the small porcelain boat with evenly mixed Se and S powder and another small porcelain boat with nanofiber precursor in the tube furnace, and the small porcelain boat with evenly mixed Se and S powder is close to the ventilation At one end of the mouth, raise the temperature at a rate of 5 °C / min to 300 °C for 2 hours; then increase the rate of te...

Embodiment 3

[0046] a FeS 2-x Se x Solid solution positive electrode material, its preparation method comprises the following steps:

[0047] (1) Add 1mmol iron oxalate and 0.5g PAN to 10ml DMF in sequence, and stir at 800r / min for 12h at 25°C to obtain a uniformly dispersed spinning solution;

[0048] (2) Spin the spinning solution obtained in step (1) into nanofibers distributed with iron precursors by electrospinning, raise the temperature to 1000° C. for 3 hours at a heating rate of 10° C. / min, and collect samples after cooling;

[0049] (3) Ball mill 4mmol S powder and 1mmol Se for 12h to obtain a homogeneous mixture;

[0050] (4) Place the small porcelain boat with evenly mixed Se and S powder and another small porcelain boat with nanofiber precursor in the tube furnace, and the small porcelain boat with evenly mixed Se and S powder is close to the ventilation At one end of the mouth, the temperature was raised to 225°C at a heating rate of 5°C / min and kept for 2 hours; then the t...

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Abstract

The invention provides a FeS<2-x>Sex solid solution positive electrode material and a preparation method thereof. The preparation method comprises the following steps: dissolving ferric salt and PAN in an organic solvent and performing continuous stirring to form a uniform spinning solution; spinning the spinning solution into nanofibers distributed with iron precursors by utilizing electrostaticspinning, and then performing carbonizing under the condition of 800-1,200 DEG C; uniformly mixing S powder and Se powder, and carrying out sulfuration selenylation on the S powder and Se powder mixture and the carbonized nano-fibers to obtain the selenium-doped carbon nano-fibers. The positive electrode material can effectively solve the problem of poor cycling stability of an existing FeS2 positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of cathode materials, in particular to a FeS 2-x Se x Solid solution cathode material and preparation method thereof. Background technique [0002] As the demand for long-distance driving electric vehicles has exceeded the capabilities of current commercial Li-ion batteries, there is an urgent need to develop Li-ion batteries with higher energy density. The rapid development of metal lithium anodes and solid electrolytes has made low-capacity cathodes the main bottleneck limiting the commercialization of high-energy-density lithium batteries, and the development of cathode materials with high energy density for lithium batteries is imminent. FeS 2 Among many positive electrode materials, it is cheap, easy to synthesize, and has a high theoretical specific capacity (up to 894mAh g -1 ) and other advantages, it is the best choice as anode material for high energy density batteries. Using it as a cathode m...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/58H01M10/0525D01F11/00D01F9/10D01D5/00
CPCD01D5/003D01F9/10D01F11/00H01M4/04H01M4/581H01M4/5815H01M10/0525H01M2004/028Y02E60/10
Inventor 王丽平李莉牛晓滨
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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