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SiOC microspheres, preparation method thereof and application thereof in lithium ion battery negative electrode material

A microsphere, oil phase technology, applied in battery electrodes, secondary batteries, circuits, etc.

Active Publication Date: 2020-11-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pyrolyzed samples are still lumpy and still require mechanical breaking and sieving

Method used

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  • SiOC microspheres, preparation method thereof and application thereof in lithium ion battery negative electrode material
  • SiOC microspheres, preparation method thereof and application thereof in lithium ion battery negative electrode material
  • SiOC microspheres, preparation method thereof and application thereof in lithium ion battery negative electrode material

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preparation example Construction

[0032] The invention provides a method for preparing SiOC microspheres, comprising the following steps:

[0033] Mix polysiloxane, liquid pore former and catalyst to obtain oil phase; mix water and surfactant to obtain water phase;

[0034] adding the oil phase dropwise to the water phase to form an oil-in-water emulsion;

[0035] solidifying the oil phase in the oil-in-water emulsion to obtain a gel;

[0036] The gel was heat-treated under an inert atmosphere to obtain SiOC microspheres.

[0037] The method provided by the invention utilizes the emulsion template method combined with the liquid pore-forming process, uses liquid organic matter stable at room temperature as the pore-forming agent, and adopts a simple emulsion template method to prepare a microspherical SiOC negative electrode with high porosity, avoiding the use of hydrothermal polymerization, supercritical Complex processes such as drying and mechanical crushing and screening; the interior of the repeatedly ...

Embodiment 1

[0056] Mix hydrogen-containing polysiloxane and polydimethylsiloxane in a mass ratio of 1:4 by magnetic stirring for 30 minutes. Then, platinum divinyltetramethyl-disiloxane complex (accounting for 1% of the mass of hydrogen-containing polysiloxane) was added into the mixture, and stirred for 15 minutes to form an oil phase. In another beaker, 20 wt.% Tween 80 was added to deionized water to obtain an aqueous phase. The mass ratio of water and oil phase is 50:1. After the water phase and the oil phase are mixed uniformly, while stirring, the oil phase is added drop by drop into the water phase to form an oil-in-water emulsion. After stirring rapidly for 15 minutes, the emulsion was heated in an oven at 80 °C for 12 hours. During this process, the oil phase liquid rapidly gels and solidifies. The obtained gel was pyrolyzed at 1000° C. for 3 h in a flowing argon atmosphere to obtain SiOC microspheres.

Embodiment 2

[0057] Example 2: Mix polymethylphenylsiloxane and phenolic resin with a mass ratio of 1:2 by magnetic stirring for 30 minutes. Then, dibutyltin dilaurate (accounting for 0.5% of the mass of polymethylphenylsiloxane) was added into the mixture, and stirred for 15 minutes to form an oil phase. In another beaker, 10 wt.% Tween 20 was added to deionized water to obtain an aqueous phase. The mass ratio of water and oil phase is 30:1. After the water phase and the oil phase are mixed uniformly, while stirring, the oil phase is added drop by drop into the water phase to form an oil-in-water emulsion. After stirring rapidly for 15 minutes, the emulsion was irradiated with ultraviolet light for 6 hours. During this process, the oil phase liquid rapidly gels and solidifies. The obtained gel was pyrolyzed at 1100° C. for 3 h in a flowing argon atmosphere to obtain SiOC microspheres.

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Abstract

The invention provides SiOC microspheres, a preparation method thereof and an application of the SiOC microspheres in a lithium ion battery negative electrode material. The method comprises the following steps: firstly, respectively preparing an oil phase and a water phase, wherein the oil phase is a mixed liquid of a precursor liquid, a liquid pore-forming agent and a catalyst, the water phase isa mixed liquid of water and a surfactant, and dropwise adding the oil phase into the water phase to form an oil-in-water emulsion; heating the emulsion in a drying oven, or curing and molding the oilphase by adopting light wave irradiation, interface reaction and the like; and finally, carrying out heat treatment in a protective atmosphere to obtain the SiOC microspheres. Experimental results show that under high current density (3600 mA.g <-1 >), the specific discharge capacity of the SiOC microspheres can reach 402 mA.h <-1 >. G <-1 > after 1000 cycles.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic materials, and in particular relates to a SiOC microsphere, its preparation method and its application in lithium-ion battery negative electrode materials. Background technique [0002] High-performance lithium-ion batteries have attracted increasing attention due to their high energy and power densities, high safety, and long lifetime. The development of lithium-ion batteries has promoted the rapid development of electric vehicles and portable electronic devices, and the development of these devices has put forward higher requirements for lithium-ion batteries. However, the current commercial graphite electrode has been difficult to meet its requirements for energy density, because its theoretical capacity is only 372mAh g -1 . Therefore, there is an urgent need to develop a material with high energy density. Among the many possible alternatives, silicon-based materials due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/907H01M4/58H01M10/0525
CPCC01B32/907H01M4/58H01M10/0525C01P2004/03C01P2004/04C01P2004/32C01P2006/40Y02E60/10
Inventor 徐鑫董宾宾郝绿原王飞鸿柯年旺杨雄风
Owner UNIV OF SCI & TECH OF CHINA
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