Preparation method of oxidized Mxene/S compound applied to lithium-sulphur battery cathode

A lithium-sulfur battery and composite technology, which is applied in the field of preparation of S composites, can solve the problems of complex preparation methods and processes, and achieve the effects of high cycle stability, high specific capacity and low production cost.

Active Publication Date: 2018-01-12
HARBIN INST OF TECH
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Problems solved by technology

[0006] The present invention aims to solve the technical problem of the complicated preparation method of the current Mxene / S composite, and provides a preparation method of an oxidized Mxene / S composite applied to the positive electrode of a lithium-sulfur battery

Method used

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  • Preparation method of oxidized Mxene/S compound applied to lithium-sulphur battery cathode
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  • Preparation method of oxidized Mxene/S compound applied to lithium-sulphur battery cathode

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specific Embodiment approach 1

[0035] Embodiment 1: This embodiment is a method for preparing an oxidized Mxene / S composite applied to the positive electrode of a lithium-sulfur battery, specifically according to the following steps:

[0036] 1. Preparation of Mxene powder: Mix the MAX phase with the HF solution, stir for 6h to 40h, let it stand for stratification naturally, then centrifuge the precipitate, repeat suction filtration and washing with deionized water and alcohol until the filtrate is neutral, and obtain an accordion after drying Like Mxene powder; The mass of described MAX phase and the volume ratio of HF solution are 1g:(50mL~200mL); The mass concentration of described HF solution is 10%~40%;

[0037] 2. Oxidation: The accordion-shaped Mxene powder was mixed with Ar and O 2 The mixed atmosphere and temperature of 100 ℃ ~ 900 ℃ under the conditions of heat treatment for 2h ~ 20h, in Ar and O 2 Cool to room temperature under the mixed atmosphere, obtain the Mxene powder of surface oxidation; ...

specific Embodiment approach 2

[0039] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the MAX phase is Ti 2 AlC, Ti 3 AlC 2 or Ti 3 SiC 2 . Others are the same as the first embodiment.

specific Embodiment approach 3

[0040] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the S source is sodium thiosulfate or sodium sulfide. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of an oxidized Mxene/S compound applied to a lithium-sulphur battery cathode, relates to a preparation method of an S compound applied to the lithium-sulphur battery cathode, and aims to solve the technical problem of complex process of an existing Mxene/S compound preparation method. The preparation method disclosed by the invention comprises the following steps: 1, preparing Mxene powder; 2, oxidizing; 3, performing a water bath method. According to the preparation method, oxidized Mxene with high conductivity is taken as an S carrier, the preparation process is simple and safe, the production cost is low, large scale production is hopefully realized, and the oxidized Mxene/S compound as a lithium-sulphur battery cathode material has very highspecific capacity and cycling stability. The preparation method is applied to preparation of the lithium-sulphur battery cathode material.

Description

technical field [0001] The invention relates to a preparation method of an S compound applied to a positive electrode of a lithium-sulfur battery. Background technique [0002] As one of the most promising new systems to replace traditional lithium-ion secondary batteries in the future, lithium-sulfur batteries have the advantages of high specific capacity, high energy density, and sufficient raw material sources, but there are still many crucial problems that need to be solved urgently. Due to the low conductivity of the positive electrode active material S, people's expectations for the application prospects of lithium-sulfur batteries are too low. Therefore, although it has been proposed, it has not received the attention it deserves. In 2009, nazzer's research group combined S with mesoporous carbon for the first time through impregnation to prepare positive electrode materials, which brought people's attention back to lithium-sulfur batteries. Because mesoporous carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCY02E60/10
Inventor 黄小萧潘虹温广武钟博夏龙张涛张晓东
Owner HARBIN INST OF TECH
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