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
CN112290018APending Publication Date: 2021-01-29ZHENGZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ZHENGZHOU UNIV
Publication Date
2021-01-29

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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.
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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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