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Hollow hybrid microsphere for negative electrode material of lithium ion battery and preparation method

A technology of lithium-ion batteries and hybrid microspheres, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problem of electrical conductivity that has not been effectively solved, electrochemical performance and electron/ion transmission capacity are limited, etc. question

Active Publication Date: 2019-03-08
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above schemes improve the MoS 2 Some deficiencies when used as anode materials for lithium-ion batteries, but these materials have not been effectively resolved due to the conductivity problem, and their electrochemical performance and electron / ion transport capabilities are still limited

Method used

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  • Hollow hybrid microsphere for negative electrode material of lithium ion battery and preparation method
  • Hollow hybrid microsphere for negative electrode material of lithium ion battery and preparation method
  • Hollow hybrid microsphere for negative electrode material of lithium ion battery and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Preparation of polystyrene template microspheres: Measure 11mL St and 0.5mL AA, add them dropwise to 90mL deionized water, stir for 30min with high-purity nitrogen, heat to 70°C, then add 10mL of 0.12g KPS Deionized 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 2Preparation of hybrid 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 12 h, then add 50 mL of deionized water, and mix and stir for 12 h to make TBOT Hydrolyzed and self-assembled on the surface of microspheres to obtain PS / TiO 2 hybrid microspheres.

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

Embodiment 2

[0033] 1) Preparation of polystyrene template microspheres: according to Example 1.

[0034] 2) PS / TiO 2 Preparation of hybrid 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 12 h, then add 50 mL of deionized water, and mix and stir for 12 h to make TBOT was hydrolyzed and self-assembled on the surface of microspheres to obtain PS / TiO 2 hybrid microspheres.

[0035] 3) PS / TiO 2 Preparation of / PDA hybrid microspheres: according to Example 1.

[0036] 4) PS / TiO 2 / PDA / MoS 2 Preparation of hybrid microspheres: according to Example 1.

[0037] 5) TiO 2 / C / MoS 2 Preparation of hybrid microspheres: according to Example 1.

Embodiment 3

[0039] 1) Preparation of polystyrene template microspheres: according to Example 1.

[0040] 2) PS / TiO 2 Preparation of hybrid microspheres: carried out according to Example 1

[0041] 3) PS / TiO 2 Preparation of / PDA hybrid microspheres: take 0.5 g of PS / TiO prepared in step 2) 2 The hybrid microspheres were dispersed in a 400mL mixed solvent with a volume ratio of ethanol: water = 7: 1 by ultrasound, 0.2g Tris and 0.5g DA were added, and mixed and stirred for 24h at room temperature. DA was mixed in PS / TiO 2 Polymerization on the surface of microspheres to obtain PS / TiO 2 / PDA hybrid microspheres.

[0042] 4) PS / TiO 2 / PDA / MoS 2 Preparation of hybrid microspheres: according to Example 1.

[0043] 5) TiO 2 / C / MoS 2 Preparation of hybrid microspheres: according to Example 1.

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Abstract

The invention belongs to the field of new materials, and particularly relates to a hollow hybrid microsphere for a negative electrode material of a lithium ion battery and a preparation method thereof. The hybrid microsphere takes monodisperse polystyrene microspheres as a template; and hydrolysis of tetrabutyl titanate on the surface of the microsphere, polymerization of dopamine on the surface of the microsphere, hydrothermal treatment in the presence of sodium molybdate dihydrate and a high-temperature carbonization process are carried out in sequence so as to prepare a TiO2 / C / MoS2 hollow hybrid microsphere. When the microsphere is used as a negative material of a lithium ion battery, high reversible capacity, excellent rate performance and excellent cycling stability are presented, anda wide application prospect is shown in the field of lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a hollow hybrid microsphere for negative electrode materials of lithium ion batteries and a preparation method thereof. Background technique [0002] Advanced energy storage devices are a vital part of developing clean and renewable energy. Due to its high energy conversion efficiency, long cycle life and low manufacturing cost, rechargeable lithium-ion batteries are recognized as the most important energy storage devices that can be used in hybrid vehicles and portable digital devices in the future. MoS 2 As a typical two-dimensional layered transition metal sulfide, because of its high theoretical specific capacity (669 mAhg -1 ) and graphite-like structures, which have attracted great attention. MoS 2 Molybdenum atoms are sandwiched between two layers of closely packed sulfur atoms, forming a sandwich-like structure. They interact with weaker van der Waals forces,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/5815H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 陈志民王瑞娟方明明姚亮张申申孟迪陈永尹梦琪陈加福付建伟
Owner ZHENGZHOU UNIV
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