Hollow composite microspheres for positive electrode materials of lithium-sulfur batteries and preparation method thereof

A technology of composite microspheres and positive electrode materials, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of lithium-sulfur battery performance degradation, affecting electrochemical performance, poor conductivity of elemental sulfur, etc., to improve the conductivity and structural stability, improving electrochemical utilization, and increasing the strength of hollow structures

Active Publication Date: 2021-12-17
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the key issue affecting the application of lithium-sulfur batteries lies in the design of the positive electrode materials of lithium-sulfur batteries, which need to solve the following problems: ① The poor conductivity of elemental sulfur reduces the electrochemical utilization rate of active materials and affects the transmission of electrons in the positive electrode; ②There is a "shuttle effect" in the charging and discharging process, which will reduce the Coulombic efficiency of the battery and lead to the performance degradation of lithium-sulfur batteries; chemical properties
However, due to the lack of polar materials such as metal oxides, its chemical adsorption capacity for polysulfides is low, and the "shuttle effect" of polysulfides cannot be suppressed, resulting in poor cycle stability of the electrode material, showing only 40 stable charge and discharge cycles

Method used

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  • Hollow composite microspheres for positive electrode materials of lithium-sulfur batteries and preparation method thereof
  • Hollow composite microspheres for positive electrode materials of lithium-sulfur batteries and preparation method thereof
  • Hollow composite microspheres for positive electrode materials of lithium-sulfur batteries and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Preparation of polystyrene template microspheres: Measure 11mL St and 5mL AA, add them dropwise to 70mL deionized water, stir for 30 minutes under high-purity nitrogen gas, heat to 70°C, then add 10mL deionized water containing 0.1gKPS Ion aqueous solution was used as an initiator, and PS microspheres with a diameter of about 250nm could be obtained by stirring at 70°C for 12h.

[0028] 2) PS / TiO 2 Preparation of composite microspheres: Take 0.5 g of PS microspheres prepared in step 1) and ultrasonically disperse them in 100 mL of ethanol, add 1 mL of TBOT and stir on a magnetic stirrer for 8 h, then add 50 mL of deionized water, mix and stir for 3 h to hydrolyze TBOT and self-assembled on the surface of microspheres to obtain PS / TiO 2 Composite microspheres.

[0029] 3) PS / TiO 2 / PDA composite microspheres: take 0.5 g of PS / TiO prepared in step 2) 2 The composite microspheres were ultrasonically dispersed in 400mL of a mixed solvent with a volume ratio of ethano...

Embodiment 2

[0034] 1) Preparation of polystyrene template microspheres: according to Example 1.

[0035] 2) PS / TiO 2 Preparation of composite microspheres: Take 0.5 g of PS microspheres prepared in step 1) and ultrasonically disperse them in 100 mL of ethanol, add 0.5 mL of TBOT and stir on a magnetic stirrer for 8 h, then add 50 mL of deionized water, and mix and stir for 3 h to make TBOT Hydrolyzed and self-assembled on the surface of microspheres to obtain PS / TiO 2 Composite microspheres.

[0036] 3) PS / TiO 2 Preparation of / PDA composite microspheres: Carry out according to Example 1.

[0037] 4) PS / TiO 2 / C / MnO 2 Preparation of composite microspheres: take 0.5 g of PS / TiO prepared in step 3) 2 / PDA composite microspheres dispersed in 250mL KMnO with a concentration of 5mM 4 Stir in the aqueous solution for 10min and centrifuge to obtain PS / TiO 2 / C / MnO 2 Composite microspheres.

[0038] 5) TiO 2 / C / MnO 2 Preparation of composite microspheres: according to Example 1.

[0...

Embodiment 3

[0041] 1) Preparation of polystyrene template microspheres: according to Example 1.

[0042] 2) PS / TiO 2 Preparation of composite microspheres: Take 0.5 g of PS microspheres prepared in step 1) and ultrasonically disperse them in 100 mL of ethanol, add 1.5 mL of TBOT and stir on a magnetic stirrer for 8 h, then add 50 mL of deionized water, and mix and stir for 3 h to make TBOT Hydrolyzed and self-assembled on the surface of microspheres to obtain PS / TiO 2 Composite microspheres.

[0043] 3) PS / TiO 2 Preparation of / PDA composite microspheres: Carry out according to Example 1.

[0044] 4) PS / TiO 2 / C / MnO 2 Preparation of composite microspheres: take 0.5 g of PS / TiO prepared in step 3) 2 / PDA composite microspheres dispersed in 250mL KMnO with a concentration of 15mM 4 Stir in the aqueous solution for 10min and centrifuge to obtain PS / TiO 2 / C / MnO 2 Composite Microspheres

[0045] 5) TiO 2 / C / MnO 2 Preparation of composite microspheres: according to Example 1.

[0...

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Abstract

The invention belongs to the field of new materials, and in particular relates to a hollow composite microsphere for lithium-sulfur battery cathode materials and a preparation method thereof. Using monodisperse polystyrene microspheres as a template, the hydrolysis of tetrabutyl titanate on the surface of the microspheres, the polymerization of dopamine on the surface of the microspheres, and KMnO 4 Oxidation of dopamine and high-temperature carbonization process to prepare TiO 2 / C / MnO 2 Hollow composite microspheres. When the microsphere is used as a positive electrode material of a lithium-sulfur battery, it has the advantages of high sulfur loading capacity, stable structure and strong adsorption of polysulfides.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a hollow composite microsphere for lithium-sulfur battery cathode materials and a preparation method thereof. Background technique [0002] With the emergence of environmental problems and the crisis of fossil fuels, people are paying more and more attention to finding clean and safe alternative energy sources. Although solar energy, wind energy, and water energy are clean and renewable, they are not as stable as fossil energy supplies, which greatly affects their promotion and application. If these energies can be stored by batteries during periods of excess supply of clean energy and released when the supply is insufficient, the stability of the supply of these energies will be greatly improved and the scope of use will be expanded. Especially with the rapid development of portable electronic products and hybrid electric vehicles, new requirements are put forward for t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/583H01M4/62H01M4/505H01M10/052
CPCH01M4/366H01M4/485H01M4/505H01M4/583H01M4/625H01M10/052Y02E60/10
Inventor 陈志民朱立琛孟迪王瑞娟杨崇姚亮张申申陈永李硕陈加福付建伟
Owner ZHENGZHOU UNIV
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