MXene/lithium sulfide/carbon composite cathode material and preparation method thereof

A technology of positive electrode materials and composite materials, applied in the field of MXene/lithium sulfide/carbon composite positive electrode materials and its preparation, can solve the problems of low discharge capacity and small specific capacity, and achieve good rate performance, high specific capacity and good cycle performance Effect

Active Publication Date: 2018-07-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, as a new type of MXene with special properties, its application in battery cathode materials needs to be further expanded. Therefore, it is necessary to develop a new lithium-sulfur battery cathode material and its preparation method to further improve lithium The problems of low discharge capacity and small specific capacity of cathode materials for sulfur batteries

Method used

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  • MXene/lithium sulfide/carbon composite cathode material and preparation method thereof
  • MXene/lithium sulfide/carbon composite cathode material and preparation method thereof
  • MXene/lithium sulfide/carbon composite cathode material and preparation method thereof

Examples

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Embodiment 1

[0042] A preparation method of MXene / lithium sulfide / carbon composite cathode material, comprising the following steps:

[0043] (1) Weigh 5gTi 3 AlC 2 , add 10% HF solution, react at 30°C for 10h, filter and dry to obtain Ti 3 C 2 .

[0044] (2) Weigh 6.4g of lithium sulfate and dissolve it in water, add 12.8g of carbon black, mix evenly under stirring conditions, and then dry to obtain a carbon black / lithium sulfate composite material.

[0045] (3) Put the carbon black / lithium sulfate composite material in step (2) in a tube furnace, and heat it to 800° C. for 2 hours under the protection of high-purity argon to obtain lithium sulfide / carbon material.

[0046] (4) Ti in step (1) 3 C 2 Mix with the lithium sulfide / carbon material in step (3) at a mass ratio of 1:1, and ball mill for 1 hour to obtain Ti 3 C 2 / lithium sulfide / carbon composite cathode material.

[0047] To the Ti obtained in this embodiment 3 C 2 / lithium sulfide / carbon composite cathode material for...

Embodiment 2

[0052] A preparation method of MXene / lithium sulfide / carbon composite cathode material, comprising the following steps:

[0053] (1) Weigh 5gTi 2 AlC, add 1% HF solution, react at 90°C for 0.5h, filter and dry to obtain Ti 2 c.

[0054] (2) Weigh 6.4g of lithium sulfate and dissolve it in water, add 64g of graphite and mix uniformly under stirring conditions, then dry to obtain graphite / lithium sulfate composite material.

[0055] (3) Put the graphite / lithium sulfate composite material in step (2) in a tube furnace, and heat it to 300° C. for 3 hours under the protection of high-purity nitrogen to obtain lithium sulfide / carbon material.

[0056] (4) Ti in step (1) 2 C is mixed with the lithium sulfide / carbon material in step (3) at a mass ratio of 1:3, and ball milled for 0.5h to obtain Ti 2 C / lithium sulfide / carbon composite cathode material.

Embodiment 3

[0058] A preparation method of MXene / lithium sulfide / carbon composite cathode material, comprising the following steps:

[0059] (1) Weigh 5gTi 3 AlC 2 , add 50% HF solution, react at 0°C for 48h, filter and dry to obtain Ti 3 C 2 .

[0060] (2) Weigh 6.4g of lithium sulfate and dissolve it in water, add 32g of graphene and mix evenly under stirring conditions, then dry to obtain graphene / lithium sulfate composite material.

[0061] (3) Put the graphene / lithium sulfate composite material in step (2) in a tube furnace, and heat it to 1500° C. for 1 hour under the protection of high-purity nitrogen to obtain lithium sulfide / carbon material.

[0062] (4) Ti in step (1) 3 C 2 Mix with the lithium sulfide / carbon material in step (3) at a mass ratio of 1:10, and ball mill for 2 hours to obtain Ti 3 C 2 / lithium sulfide / carbon composite cathode material.

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Abstract

The invention relates to an MXene/lithium sulfide/carbon composite cathode material and a preparation method of the MXene/lithium sulfide/carbon composite cathode material. The method comprises the following steps: (1) etching an MAX phase powder with an acid, filtering, washing and drying to obtain an MXene nanometer material with a porous structure; (2) preparing a solution from lithium sulfate,proportionally mixing with a carbon material or a carbon precursor, preparing a carbon/lithium sulfate or carbon precursor/lithium sulfate composite material; (3) heating the carbon/lithium sulfate or carbon precursor/lithium sulfate composite material in the step (2) under the protective atmosphere, reducing the above composite material into a lithium sulfide/carbon material by means of thermalreduction; (4) mixing the MXene nanometer material with the porous structure obtained in the step (1) with the lithium sulfide/carbon in the step (3), and ball-milling to obtain the MXene/lithium sulfide/carbon composite cathode material. Compared with the prior art, the prepared MXene/lithium sulfide/carbon composite cathode material has the advantages of high electrical conductivity, high specific capacity, good cycle performance, good rate capability, simple preparation process and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to an MXene / lithium sulfide / carbon composite positive electrode material and a preparation method thereof. Background technique [0002] Lithium-sulfur batteries have become a research hotspot due to their high energy density, environmental friendliness, and inexpensive electrode materials. The cathode materials of lithium-sulfur batteries are usually divided into two types: elemental sulfur and lithium sulfide. Elemental sulfur-based cathode materials are cheap and easy to obtain, and the preparation process is simple, but there will be a large volume expansion during charging and discharging, which will destroy the structure of the material, thereby affecting the electrochemical performance of the battery. For lithium sulfide-based materials, it is charged first and then discharged, so the destruction of the material structure caused by volume expansi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 冯金奎安永灵
Owner SHANDONG UNIV
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