a c/ti based 4 o 7 Composite nanofiber lithium-sulfur battery cathode material and preparation method thereof

A technology of composite nanofibers and positive electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of limited conductivity of sulfur electrodes, and achieve the effects of facilitating industrial production, high conductivity, and improving utilization

Active Publication Date: 2017-11-17
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these semiconductor nano-oxide additives have limited effect on improving the conductivity of sulfur electrodes.

Method used

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  • a c/ti based <sub>4</sub> o <sub>7</sub> Composite nanofiber lithium-sulfur battery cathode material and preparation method thereof
  • a c/ti based <sub>4</sub> o <sub>7</sub> Composite nanofiber lithium-sulfur battery cathode material and preparation method thereof
  • a c/ti based <sub>4</sub> o <sub>7</sub> Composite nanofiber lithium-sulfur battery cathode material and preparation method thereof

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Experimental program
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Embodiment 1

[0033] A kind of C / Ti based on the present invention 4 o 7 The composite nanofiber lithium-sulfur battery cathode material is composed of elemental sulfur and C / Ti with a mass ratio of 2:1 4 o 7 Composite nanofiber composite, C / Ti 4 o 7 The composite nanofiber has a core-shell structure, and the core is Ti 4 o 7 , the shell is porous carbon, the diameter of the composite nanofiber is 150nm, the length is 25μm, the pore diameter is 15nm, and the specific surface area is 158m 2 / g.

[0034] The preparation method of the lithium-sulfur battery positive electrode material of the present embodiment comprises the following steps:

[0035](1) Dissolving 2g of polyvinylpyrrolidone (PVP, with a weight average molecular weight of 40,000) in 38g of absolute ethanol to prepare a PVP solution with a mass fraction of 5%; 6mL of tetrabutyl titanate and 3mL of acetic acid were mixed uniformly to form a yellow Tetrabutyl titanate / acetic acid mixed solution.

[0036] (2) Slowly add the...

Embodiment 2

[0047] The positive electrode material of the lithium-sulfur battery in this embodiment is composed of elemental sulfur and C / Ti with a mass ratio of 3:1. 4 o 7 Composite nanofiber composite, C / Ti 4 o 7 The composite nanofiber has a core-shell structure, and the core is Ti 4 o 7 , the shell is porous carbon, C / Ti 4 o 7 The diameter of the composite nanofiber is 210nm, the length is 15μm, the pore diameter is 8nm, and the specific surface area is 118m 2 / g.

[0048] The preparation method of the lithium-sulfur battery positive electrode material of the present embodiment comprises the following steps:

[0049] (1) Dissolving 2g of polyvinylpyrrolidone (PVP, with a weight average molecular weight of 40,000) in 38g of absolute ethanol to prepare a PVP solution with a mass fraction of 5%; 6mL of tetrabutyl titanate and 3mL of acetic acid were mixed uniformly to form a yellow Tetrabutyl titanate / acetic acid mixed solution.

[0050] (2) Slowly add the tetrabutyl titanate / ac...

Embodiment 3

[0056] Based on C / Ti prepared in this embodiment 4 o 7 The composite nanofiber lithium-sulfur battery cathode material is composed of elemental sulfur and C / Ti with a mass ratio of 2:1 4 o 7 Composite nanofiber composite, C / Ti 4 o 7 The composite nanofiber has a core-shell structure, and the core is Ti 4 o 7 , the shell is porous carbon, C / Ti 4 o 7 The diameter of the composite nanofiber is 135nm, the length is 28μm, the pore size is 12nm, and the specific surface area is 175m 2 / g.

[0057] The preparation method of the lithium-sulfur battery positive electrode material of the present embodiment comprises the following steps:

[0058] (1) Dissolve 1.5g of polyvinylpyrrolidone (PVP, with a weight average molecular weight of 40,000) in 21g of absolute ethanol to prepare a PVP solution with a mass fraction of 6.7%; mix 5mL of tetrabutyl titanate and 2.5mL of acetic acid to form Yellow tetrabutyl titanate / acetic acid mixed solution.

[0059] (2) Slowly add the tetrabut...

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Abstract

The invention discloses a C / Ti4O7 composite nanofiber based lithium-sulfur battery positive electrode material. The lithium-sulfur battery positive electrode material is compounded by elemental sulfur and C / Ti4O7 composite nanofiber, wherein the C / Ti4O7 composite nanofiber adopts a core-shell structure; and the Ti4O7 is taken as the core while porous carbon is taken as the shell. The preparation method comprises the steps of preparing the C / Ti4O7 composite nanofiber by an electrostatic spinning process; mixing the C / Ti4O7 composite nanofiber with the elemental sulfur; and putting the mixture into a sealed container and performing thermal treatment at a temperature of 150-155 DEG C for 12-24h to obtain the positive electrode material. The positive electrode material has a porous channel structure formed by the porous carbon, so that rapid polysulfide absorption can be realized, and the cycling life of the lithium-sulfur battery can be prolonged; and in addition, due to the high conductivity of Ti4O7, the utilization rate of sulfur is improved, so that the cycling performance of the lithium-sulfur battery is relatively high.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a C / Ti-based 4 o 7 Composite nanofiber lithium-sulfur battery cathode material and preparation method thereof. Background technique [0002] With the increasing environmental pollution and energy crisis, the development and application of high energy density, low-cost secondary batteries in renewable energy systems has gradually become the focus of research. Lithium-sulfur battery is a kind of secondary battery system under development with high energy density. It uses elemental sulfur or sulfur material as the positive electrode active material. Advantages such as cheap price. [0003] Due to the low conductivity of sulfur cathode materials in lithium-sulfur batteries and the easy formation of polysulfides during battery cycling, the utilization rate of sulfur active materials is low and the battery capacity fades sharply, resulting in poor battery cycle performance. The s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/587
CPCH01M4/364H01M4/485H01M4/587Y02E60/10
Inventor 姚山山唐豪沈湘黔侯金利吴潇景茂祥钱昕晔饶德伟廖达前习小明肖可颂
Owner CHANGSHA RES INST OF MINING & METALLURGY
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