Pre-lithiated and graphene-coated mesoporous SiO negative electrode material and preparation method thereof

A graphene-coated, negative electrode material technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of low capacity, poor first charge-discharge efficiency and cycle performance, poor SiO conductivity, etc., and achieve cycle performance. And the effect of high charge-discharge specific capacity, reducing polarization phenomenon and improving electronic conductivity

Active Publication Date: 2015-04-29
李震祺 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the poor conductivity of SiO and a large amount of Li in the first charging and discharging process + Due to consumption and other reasons, the problems of low capacity, first charge and discharge efficiency and poor cycle performance are caused. A pre-lithiated and graphene-coated mesoporous SiO negative electrode material and its preparation method are provided.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Dissolve 41.64g of metallic lithium powder successively in a Dewar flask filled with 600mL of liquid ammonia to form a 10mol / L dark blue lithium solution. 2.500 g of graphene oxide prepared by the Hummers method was added to 200 mL of acetone, and ultrasonically treated at an ultrasonic frequency of 40 KHz for 2 h to obtain a graphene oxide dispersion with a dispersion concentration of 12.5 g / L. The specific surface area of ​​50g is 508m 2 / g, the nano-mesoporous SiO prepared by the microemulsion method with a pore size of 7.9nm 2 The microspheres were added to the prepared graphene oxide dispersion, and the ultrasonic treatment was continued for 3 hours at an ultrasonic frequency of 40KHz to obtain a uniformly dispersed mixed system. Take 500mL of the prepared lithium metal solution, and gradually add the lithium metal solution dropwise into the uniformly dispersed mixing system under the condition of magnetic stirring. After fully reacting, gradually add 377g of pro...

Embodiment 2

[0046] Dissolve 34.7g of lithium metal powder successively in a Dewar flask filled with 1L of liquid ammonia to form a 5mol / L dark blue lithium solution. 2.000 g of graphene oxide prepared by the Brodie method was added to 2 L of ether, and ultrasonically treated at an ultrasonic frequency of 40 KHz for 2 h to obtain a graphene oxide dispersion with a dispersion concentration of 1 g / L. The specific surface area of ​​56g is 698m 2 / g, pore size of 3.8nm in the hard template prepared nano-mesoporous SiO 2 The microspheres were added to the prepared graphene oxide dispersion, and the ultrasonic treatment was continued for 5 hours at an ultrasonic frequency of 80KHz to obtain a uniformly dispersed mixed system. Take 380mL of the prepared lithium metal solution, and gradually add the lithium metal solution dropwise into the uniformly dispersed mixing system under the condition of magnetic stirring. After fully reacting, gradually add 143.26 g of propylene oxide to the above-menti...

Embodiment 3

[0048] Embodiment 3: 13.88g metallic lithium powder is successively dissolved in the Dewar flask that 200mL liquid ammonia is housed, forms the dark blue lithium solution of 10mol / L. 2.500 g of graphene oxide prepared by the Hummers method was added to 200 mL of methyl ether, and ultrasonically treated at an ultrasonic frequency of 40 KHz for 2 h to obtain a graphene oxide dispersion with a dispersion concentration of 12.5 g / L. 50g of nano-mesoporous SiO 2 The microspheres were added to the prepared graphene oxide dispersion, and the ultrasonic treatment was continued for 3 hours at an ultrasonic frequency of 40KHz to obtain a uniformly dispersed mixed system. Take 180mL of the prepared lithium metal solution, and gradually add the lithium metal solution dropwise into the uniformly dispersed mixing system under the condition of magnetic stirring. After fully reacting, gradually add 104.4 g of propylene oxide to the above-mentioned reacted mixed system while stirring, stir for...

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Abstract

The invention discloses a pre-lithiated and graphene-coated mesoporous SiO negative electrode material and a preparation method thereof. The method comprises the following steps: firstly, adding metal lithium to a non-aqueous solvent to form a lithium solution; secondly, adding graphene oxide to a dispersing solvent and carrying out ultrasonic treatment to obtain 0.5-60g / L of graphene oxide dispersion; adding nano mesoporous SiO microspheres with the specific surface area of 500-700m<2> / g to the dispersion, and carrying out ultrasonic treatment; adding the lithium solution under a stirring condition; adding a lithium complexing agent, stirring, filtering and washing to obtain a precursor; and finally drying the precursor in vacuum, grinding evenly, packing into a corundum boat, sintering in an inert atmosphere furnace, and cooling along with the furnace, so as to obtain the pre-lithiated and graphene-coated mesoporous SiO negative electrode material. The composite material is prelithiated in the process of preparing the graphene-coated mesoporous SiO negative electrode material; and the initial Coulomb efficiency, the cycle performance and the charge and discharge specific capacity of a silicon oxide negative electrode material are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials and preparation methods thereof, and relates to a pre-lithiated and graphene-coated mesoporous SiO negative electrode material and a preparation method thereof. Background technique [0002] With the development of science and technology, electronic devices are more miniaturized and lighter, and the use of portable electronic devices is becoming more and more extensive, which makes the development of lithium-ion batteries with higher capacity a focus. Positive and negative electrode materials are the key factors that determine the energy storage, service life, cost and price of lithium-ion batteries. However, since the commercialization of lithium-ion batteries, positive electrode materials have been continuously introduced, while negative electrode materials have been using carbon-based materials. However, the capacity of carbon-based materials is low, which can no longer meet the dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62
CPCH01M4/48H01M4/625H01M10/0525Y02E60/10
Inventor 李震祺刘立君宋翠环
Owner 李震祺
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