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Hollow sandwiched SiO2/C/MoS2 hybridized microsphere for lithium ion battery anode material

A technology of lithium-ion batteries and hybrid microspheres, applied in battery electrodes, secondary batteries, electrochemical generators, etc., to achieve the effect of increasing specific capacity and energy density

Active Publication Date: 2019-05-31
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there is no hollow sandwich SiO2 that can be used as an anode material for lithium-ion batteries. 2 / C / MoS 2 Report on the preparation and property testing of hybrid microspheres

Method used

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  • Hollow sandwiched SiO2/C/MoS2 hybridized microsphere for lithium ion battery anode material
  • Hollow sandwiched SiO2/C/MoS2 hybridized microsphere for lithium ion battery anode material
  • Hollow sandwiched SiO2/C/MoS2 hybridized microsphere for lithium ion battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Preparation of PS template microspheres: Add 11 mL of St and 70 mL of deionized water into a 250 mL round bottom flask equipped with mechanical stirring, stir for 30 min under high-purity nitrogen, heat to 70 °C, and then add 15 mL of 0.1 g KPS Deionized aqueous solution was used as an initiator, and PS microspheres with a diameter of about 230nm were obtained by stirring at 70°C for 12h.

[0033] 2) PS / SiO2 2 Preparation of hybrid microspheres: In a 250 mL round bottom flask, ultrasonically disperse 2 g of PS microspheres prepared in step 1) in 160 mL of ethanol, then add 1.5 mL of TEOS and stir for 30 min, heat the solution to 40 °C, and then add 20mL of ammonia water was stirred continuously for 12h with mechanical stirring to hydrolyze TEOS and self-assemble on the surface of microspheres to obtain PS / SiO 2 hybrid microspheres.

[0034] 3) PS / SiO2 2 / PDA hybrid microspheres: take 0.5 g of PS / SiO prepared in step 2) 2 The hybrid microspheres were ultrasonicall...

Embodiment 2

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

[0040] 2) PS / SiO2 2 Preparation of hybrid microspheres: In a 250 mL round bottom flask, 2 g of PS microspheres prepared in step 1) were ultrasonically dispersed in 160 mL of ethanol, then 1.0 mL of TEOS was added and stirred for 30 min, the solution was heated to 40 °C, and then added 20mL of ammonia water was stirred continuously for 12h with mechanical stirring to hydrolyze TEOS and self-assemble on the surface of microspheres to obtain PS / SiO 2 hybrid microspheres.

[0041] 3) PS / SiO2 2 Preparation of / PDA hybrid microspheres: according to Example 1.

[0042] 4) PS / SiO2 2 / PDA / MoS 2 Preparation of hybrid microspheres: according to Example 1.

[0043] 5) SiO2 2 / C / MoS 2 Preparation of hybrid microspheres: according to Example 1.

Embodiment 3

[0045] 1) Preparation of PS template microspheres: according to Example 1.

[0046] 2) PS / SiO2 2 Preparation of hybrid microspheres: according to Example 1.

[0047] 3) PS / SiO2 2 / PDA hybrid microspheres: take 0.5 g of PS / SiO 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 = 7: 1, 0.15 g Tris and 0.45 g DA were added, and mixed and stirred for 24 h at room temperature. DA was mixed in PS / SiO 2 Polymerization on the surface of microspheres to obtain PS / SiO 2 / PDA hybrid microspheres.

[0048] 4) PS / SiO2 2 / PDA / MoS 2 Preparation of hybrid microspheres: according to Example 1.

[0049] 5) SiO2 2 / C / MoS 2 Preparation of hybrid microspheres: according to Example 1.

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Abstract

The invention belongs to the field of lithium ion battery anode materials and particularly relates to hollow sandwiched SiO2 / C / MoS2 hybridized microsphere for a lithium ion battery anode material. Thehollow sandwiched SiO2 / C / MoS2 hybridized microsphere is prepared by using a monodispersed polystyrene microsphere as a template, and performing hydrolysis of tetraethyl orthosilicate 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 high temperature carbonization. When used asa lithium ion battery anode material, the microsphere exhibits a large reversible capacity, excellent rate performance and excellent cycle stability, and has broad application prospect in the field oflithium ion batteries.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials, in particular to a hollow sandwich-type SiO2 for lithium-ion battery negative electrode materials 2 / C / MoS 2 hybrid microspheres. Background technique [0002] Due to the advantages of high energy density, no memory effect, environmental friendliness and long cycle life, lithium-ion batteries have been widely used in many fields such as portable electronic devices and hybrid vehicles. Although graphite has been widely used in commercial lithium-ion battery anode materials, its low theoretical capacity (372mAhg -1 ) has been unable to meet the requirements for the development of new high-energy-density lithium-ion batteries. In order to meet the more stringent requirements for energy density and cycle life of lithium-ion batteries, the development of high-performance electrode materials has become an important part of technological innovation in the field of lithi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M4/587H01M10/0525
CPCY02E60/10
Inventor 陈志民杨崇王瑞娟陈永方明明陈加福付建伟
Owner ZHENGZHOU UNIV
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