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SnO2 modified MoS2 hollow microsphere loaded sulfur positive electrode composite material and application thereof in lithium-sulfur battery

A composite material and sulfur positive electrode technology, applied in the direction of lithium batteries, positive electrodes, battery electrodes, etc., can solve the problems of weak chemical interaction, poor Coulombic efficiency capacity decay, etc., to improve electrochemical performance, promote penetration, excellent electrochemical performance performance effect

Pending Publication Date: 2021-01-29
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor Coulombic efficiency and fast capacity fading still exist due to the weak chemical interaction between nonpolar carbon and polar polysulfides.

Method used

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  • SnO2 modified MoS2 hollow microsphere loaded sulfur positive electrode composite material and application thereof in lithium-sulfur battery
  • SnO2 modified MoS2 hollow microsphere loaded sulfur positive electrode composite material and application thereof in lithium-sulfur battery
  • SnO2 modified MoS2 hollow microsphere loaded sulfur positive electrode composite material and application thereof in lithium-sulfur battery

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Embodiment 1

[0055] The present invention SnO 2 Modified MoS 2 The detailed steps of the hollow microsphere-loaded sulfur cathode composite material are as follows:

[0056] 1) MnCO 3 Preparation of microsphere template:

[0057] a. Add 0.01mol of NaHCO 3 Dissolve in 70ml deionized water, and obtain A solution after fully dissolving;

[0058] b. Mix 0.001mol of MnSO 4 ·H 2 O was dissolved in 70ml of deionized water, and 7ml of absolute ethanol was added under the condition of constant stirring, and the B solution was obtained after stirring evenly;

[0059] c. Then, under the condition of constant stirring, slowly pour the obtained A solution into the B solution, seal the container, and then put it into an oven for reaction. The reaction temperature is 60°C, and the reaction time is 4h. After the reaction, collect the white precipitate Wash and dry in vacuum (washing is to use deionized water and absolute ethanol to wash alternately until the supernatant obtained is neutral; when va...

Embodiment 2

[0069] The present invention SnO 2 Modified MoS 2 The detailed steps of the hollow microsphere-loaded sulfur cathode composite material are as follows:

[0070] 1) MnCO 3 Preparation of microsphere template:

[0071] a. Add 0.01mol of NaHCO 3 Dissolve in 70ml deionized water, and obtain A solution after fully dissolving;

[0072] b. Mix 0.001mol of MnSO 4 ·H 2 O was dissolved in 70ml of deionized water, and 7ml of absolute ethanol was added under the condition of constant stirring, and the B solution was obtained after stirring evenly;

[0073] c. Then, under the condition of constant stirring, slowly pour the obtained A solution into the B solution, seal the container, and then put it into an oven for reaction. The reaction temperature is 60°C, and the reaction time is 4h. After the reaction, collect the white precipitate Wash and dry in vacuum (washing is to use deionized water and absolute ethanol to wash alternately until the supernatant obtained is neutral; when va...

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Abstract

The invention discloses a SnO2 modified MoS2 hollow microsphere loaded sulfur positive electrode composite material and an application thereof. The preparation method comprises the following steps: firstly, preparing a MnCO3 microsphere template, carrying out hydrothermal reaction on the microsphere template, a molybdenum source and a sulfur source to obtain MnS@ MoS2 core-shell microspheres, etching the MnS@ MoS2 core-shell microspheres in diluted hydrochloric acid, and annealing obtained precipitates to obtain MoS2 microspheres; preparing the microspheres into a MoS2 microsphere solution byusing deionized water, dispersing the solution, adding SnCl4. 5H2O and NaOH, uniformly stirring, transferring the obtained mixed solution into a stainless steel autoclave with a PTFE lining, reacting,and treating to obtain a MoS2@SnO2 composite material; and compounding the obtained material with a sulfur powder by using a melt infiltration method to obtain a MoS2@SnO2 / S positive electrode material. The product disclosed by the invention is used as a positive electrode material for manufacturing a lithium-sulfur battery, and has the advantages of a relatively high reversible specific capacity, an excellent rate capability, excellent long-term cycling stability and the like.

Description

[0001] 1. Technical field: [0002] The invention relates to the technical field of new materials and new energy sources, in particular to a SnO 2 Modified MoS 2 Hollow microsphere-supported sulfur cathode composites and their application in lithium-sulfur batteries. [0003] 2. Background technology: [0004] At present, the easy dissolution of polysulfide intermediates and the resulting shuttle effect during charge / discharge cycling are the biggest challenges limiting the development and application of Li-S batteries. On the one hand, this phenomenon results in the loss of the active species sulfur, reducing material utilization, which in turn leads to rapid capacity fading and poor Coulombic efficiency. On the other hand, the sulfur species reaching the negative electrode by the “shuttle effect” will contaminate lithium metal, cause severe negative electrode corrosion, and bring potential safety hazards. In addition, sulfur cathodes suffer from slow electrochemical redox ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/052
CPCH01M4/5815H01M4/624H01M4/628H01M10/052H01M2004/028Y02E60/10
Inventor 李松杰李帆卫正钰邵理想
Owner ZHENGZHOU UNIV
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