Lithium sulfide/carbon composite nanometer material and preparation method and application thereof

A nanomaterial, lithium sulfide technology, applied in the field of material science, can solve the problems of difficulty in realizing lithium sulfide/carbon nanocomposite materials, harsh operating conditions, low process cost, etc., and achieves controllable morphology, high controllability, and raw materials. Inexpensive and accessible effects

Active Publication Date: 2017-01-04
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Archer research group at Cornell University in the United States used a high-temperature solid-state method to pyrolyze lithium sulfate and resorcinol and formaldehyde polymers to prepare spherical lithium sulfide / carbon composites (Journal of Materials Chemistry A, 2013, 1, 1433 -1440), the process cost is low, but the process is more complicated
[0003] All in all, the existing technology is still difficult to achieve the controllable preparation of the morphology of lithium sulfide / carbon nanocomposites, and there are generally defects such as relatively high cost and harsh operating conditions.

Method used

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  • Lithium sulfide/carbon composite nanometer material and preparation method and application thereof
  • Lithium sulfide/carbon composite nanometer material and preparation method and application thereof
  • Lithium sulfide/carbon composite nanometer material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1: Li 2 SO 4 ·H 2O (20wt%, accounted for mass fraction in the final spinning solution, the same below) was dissolved in the mixed solvent of DMF (0wt%) and deionized water (60wt%), added PVP (Mw=1300000, 20wt%) ), stirring under magnetic stirring (100rpm) for 24h to form a uniform and transparent solution (ie spinning solution). Add the prepared spinning solution into the liquid storage tube of the spinning device for electrospinning, the nozzle diameter is 0.5mm, the angle between the nozzle and the horizontal plane is adjusted to 70°, a DC voltage of 13kV is applied, the curing distance is 15cm, and the temperature is 25 °C and a relative humidity of 30%, Li 2 SO 4 / PVP composite nanofibers. the Li 2 SO 4 / PVP composite nanofibers were placed in a program-controlled temperature box furnace for heat treatment, the heating rate was 2°C / min, and the temperature was kept at 350°C for 4 hours in an air atmosphere, and then naturally cooled to room tempera...

Embodiment 2

[0036] Embodiment 2: Li 2 SO 4 ·H 2 O (10wt%, accounted for mass fraction in the final spinning solution, the same below) was dissolved in the mixed solvent of DMF (30wt%) and deionized water (50wt%), added PVP (Mw=1300000, 10wt% ), stirring under magnetic stirring (2000rpm) for 4h to form a uniform and transparent solution (ie spinning solution). Add the prepared spinning solution into the liquid storage tube of the spinning device for electrospinning, the nozzle diameter is 0.3mm, the angle between the nozzle and the horizontal plane is adjusted to 10°, a DC voltage of 7kV is applied, the curing distance is 40cm, and the temperature is 35 °C, 10% relative humidity, Li 2 SO 4 / PVP composite nanofibers. the Li 2 SO 4 / PVP composite nanofibers were placed in a program-controlled temperature box furnace for heat treatment, the heating rate was 5°C / min, and the temperature was kept at 350°C for 4 hours in an air atmosphere, and then naturally cooled to room temperature wit...

Embodiment 3

[0037] Embodiment 3: with Li 2 SO 4 ·H 2 O (5wt%, the mass fraction in the final spinning solution, the same below) was dissolved in a mixed solvent of DMF (20wt%) and deionized water (45wt%), and PVP (Mw=1300000, 30wt%) was added ), stirring under magnetic stirring (500rpm) for 24h to form a uniform and transparent solution (i.e. spinning solution), adding the prepared spinning solution to the liquid storage tube of the spinning device for electrostatic spinning, the nozzle diameter is 0.9mm, Adjust the angle between the nozzle and the horizontal plane to be 20°, apply a DC voltage of 20kV, cure at a distance of 20cm, temperature at 0°C, and relative humidity of 60%, to obtain Li 2 SO 4 / PVP composite nanofibers. the Li 2 SO 4 / PVP composite nanofibers were heat treated in a programmed temperature-controlled box furnace with a heating rate of 10°C / min, kept at a constant temperature of 350°C for 4 hours in an air atmosphere, and then naturally cooled to room temperature...

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Abstract

The invention discloses a lithium sulfide/carbon composite nanometer material and a preparation method and application thereof. In a relatively typical embodiment, the method comprises the steps of fully mixing lithium sulfate and a carbon material precursor or a carbon material, and performing thermal treatment, wherein the thermal treatment condition comprises a temperature rising rate of 1-20 DEG C per minute, a constant temperature of 600 to 1000 DEG C for 2-12 hours in an inert atmosphere; and natural cooling of the material to a room temperature to acquire the lithium sulfide/carbon composite material. The invention provides a process for synthesizing the lithium sulfide/carbon nanocomposite material by reducing lithium sulfate with carbon, the process is simple and easy to operate, is high in controllability and low in cost, the raw materials are low in price and easy to get, moreover, the obtained product is the lithium sulfide/carbon nanocomposite material which is uniformly dispersed, has good performance and is controllable in morphology, the lithium sulfide/carbon nanocomposite material comprises a one-dimensional nanometer fiber, a two-dimensional nanosheet and the like, and the lithium sulfide/carbon nanocomposite material is high in conductivity and can be widely applied to an electrochemical energy storage device such as a lithium-sulfur battery.

Description

technical field [0001] The invention specifically relates to a lithium sulfide / carbon composite nanomaterial in the field of material science and its preparation method and application. Background technique [0002] Due to its high theoretical specific capacity (1166mAh / g), lithium sulfide has attracted more and more attention from academia, industry and governments. However, due to the poor conductivity of lithium sulfide, the utilization rate of assembled batteries is low, so it is necessary to uniformly coat a layer of carbon material on its surface to form lithium sulfide / carbon composite materials, so as to improve its electrochemical energy storage performance. The current preparation methods of lithium sulfide / carbon composites mainly focus on liquid phase coating method and solid phase ball milling method, but most of the synthesis systems directly use lithium sulfide as raw material, or use lithium metal salts to react with sulfur to form lithium sulfide. Although ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62B82Y30/00
CPCB82Y30/00H01M4/362H01M4/5815H01M4/625H01M2004/021Y02E60/10
Inventor 张跃钢刘美男叶方敏张素侯远
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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