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Preparation method of porous SiOC ceramic and application thereof in negative electrode material of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, ceramic products, applications, etc., can solve problems such as strong corrosion, and achieve the effects of improved performance, good cycle discharge performance, good rate performance and cycle performance

Active Publication Date: 2022-02-18
HENAN INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

HF is highly corrosive, while NaOH and KOH require high temperature etching

Method used

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  • Preparation method of porous SiOC ceramic and application thereof in negative electrode material of lithium ion battery
  • Preparation method of porous SiOC ceramic and application thereof in negative electrode material of lithium ion battery
  • Preparation method of porous SiOC ceramic and application thereof in negative electrode material of lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 2 ml PhTES into 5 ml EtOH and stir, add 0.9 ml deionized water dropwise, then seal and stir for 9-12 h to obtain PhTES sol;

[0037] Weigh 1.5 g, 2.0 g, 2.5 g, 3.0 g of starch and add to 10 mL of H 2 O / EtOH mixed solution (v / v=1:1), then add 0.15 g, 0.20 g, 0.25 g, 0.30 g KH540 respectively, stir for 30 min, then add PhTES sol solution, at 80 o C stirred until dry to obtain a white powder, placed in 100 o After drying in a C oven for 24 h, at 900 o C heat treatment for 2 h. The synthesized samples were numbered, 1-1, 1-2, 1-3, and 1-4 corresponded to SiOC materials synthesized from 1.5 g, 2.0 g, 2.5 g, and 3.0 g starch, respectively.

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Abstract

The invention discloses a preparation method of porous SiOC ceramic and application thereof in a negative electrode material of a lithium ion battery. According to the invention, phenyl triethoxysilane is used as a sol-gel precursor, starch is used as a template, 3-aminopropyltriethoxysilane (KH540) is used as a surface modifier, and the porous SiOC ceramic is successfully synthesized. The synthesis of the porous SiOC ceramic is affected by the starch consumption, the KH540 ratio and the EtOH / H2O ratio; the specific surface area of the SiOC ceramic is 207.3 m < 2 > g <-1 > when the starch content is 2.5 g, and the good rate capability and the good cycle performance are represented; and the discharge capacities of the material are respectively 745 mAhg <-1 > and 483 mAhg <-1 > after 200 cycles under the current of 37.2 mAg <-1 > and 372 mAg <-1 >.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials of lithium ion batteries, and in particular relates to the synthesis and application of porous SiOC ceramics. Background technique [0002] As a rechargeable battery for energy storage and conversion, lithium-ion batteries have the characteristics of light weight, high working voltage, no memory effect, and environmental friendliness. They are widely used in mobile phones, notebook computers, electric vehicles and other fields. Graphite, as a commonly used anode material for lithium-ion batteries, has a theoretical capacity of only 372 mAh / g, which is difficult to meet the current energy demand. Moreover, carbon materials such as carbon nanotubes and graphene are easy to contact and react with the electrolyte during charging and discharging. In addition, materials such as transition metal oxides, Si-based, Ge-based, and Sn-based materials have been developed to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622C04B38/06H01M4/587H01M10/0525H01M10/058
CPCC04B35/5603C04B35/622C04B38/0645H01M4/587H01M10/0525H01M10/058H01M2004/027H01M2004/021C04B2235/483C04B2235/96Y02E60/10Y02P70/50
Inventor 夏克东刘晓段凌瑶李芸玲侯振雨
Owner HENAN INST OF SCI & TECH
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