SiOC composite negative electrode material for lithium ion battery and preparation method of SiOC composite negative electrode material

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle stability and high irreversible capacity of SiOC negative electrode materials.

Inactive Publication Date: 2018-04-13
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to solve the problems such as high initial irreversible capacity and poor cycle stability of SiOC negative electrode materials for lithium ion batteries, and provide a preparation method of SiOC composite negative electrode materials for lithium ion batteries. The method combines porous SiOC ceramics with conductive Composite anode materials with porous channels are prepared by compounding graphene with good quality, soft material and stable performance

Method used

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  • SiOC composite negative electrode material for lithium ion battery and preparation method of SiOC composite negative electrode material
  • SiOC composite negative electrode material for lithium ion battery and preparation method of SiOC composite negative electrode material
  • SiOC composite negative electrode material for lithium ion battery and preparation method of SiOC composite negative electrode material

Examples

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Effect test

Embodiment 1

[0030] (1) Mix the solution of hydrogen-containing silicone oil, divinylbenzene and chloroplatinic acid (concentration: 11.3ppm) in a mass ratio of 6:3:1, and then crosslink at 120°C for 12h to synthesize solid polysiloxane alkyl;

[0031] (2) Ball mill the poplar wood chips after sieving, the ball milling time is 24 hours, the speed of rotation is 250r / min, the abrasive is taken out and dried, the treated wood powder is sieved and the particle size is less than 64 μm for later use; the poplar wood powder and polysilicon The oxane is ball milled at a mass ratio of 1:1 until uniformly mixed, the ball milling time is 12 hours, and the ball milling rate is 250r / min;

[0032] (3) Put the mixture of wood powder and polysiloxane in a tube furnace and sinter at high temperature under the protection of Ar gas. The speed is raised to 400°C, and the temperature is kept for 30 minutes; then the temperature is raised to 1000°C at a speed of 5°C / min, and the temperature is kept for 3 hour...

Embodiment 2

[0035] (1) Mix the solution of hydrogen-containing silicone oil, divinylbenzene and chloroplatinic acid (concentration: 11.3ppm) in a mass ratio of 6:3:1, and then crosslink at 120°C for 12h to synthesize solid polysiloxane alkyl;

[0036] (2) Ball mill the poplar wood chips after sieving, the ball milling time is 24 hours, the speed of rotation is 250r / min, the abrasive is taken out and dried, the treated wood powder is sieved and the particle size is less than 64 μm for later use; the poplar wood powder and polysilicon The oxane is ball milled at a mass ratio of 2:1 until uniformly mixed, the ball milling time is 12 hours, and the ball milling rate is 250r / min;

[0037] (3) Put the mixture of wood powder and polysiloxane in a tube furnace and sinter at high temperature under the protection of Ar gas. The speed is raised to 400°C, and the temperature is kept for 30 minutes; then the temperature is raised to 1000°C at a speed of 5°C / min, and the temperature is kept for 3 hour...

Embodiment 3

[0040] (1) Mix the solution of hydrogen-containing silicone oil, divinylbenzene and chloroplatinic acid (concentration: 11.3ppm) in a mass ratio of 6:3:1, and then crosslink at 120°C for 12h to synthesize solid polysiloxane alkyl;

[0041] (2) Ball mill the poplar wood chips after sieving, the ball milling time is 24 hours, the speed of rotation is 250r / min, the abrasive is taken out and dried, the treated wood powder is sieved and the particle size is less than 64 μm for later use; the poplar wood powder and polysilicon The oxane is ball milled at a mass ratio of 3:1 until uniformly mixed, the ball milling time is 12 hours, and the ball milling rate is 250r / min;

[0042] (3) Put the mixture of wood powder and polysiloxane in a tube furnace and sinter at high temperature under the protection of Ar gas. The speed is raised to 400°C, and the temperature is kept for 30 minutes; then the temperature is raised to 900°C at a speed of 5°C / min, and the temperature is kept for 3 hours...

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Abstract

The invention relates to the technical field of composite material preparation, in particular to a SiOC composite negative electrode material for assembling a lithium ion battery negative electrode and a preparation method of the SiOC composite negative electrode material. The preparation method comprises the steps of firstly, obtaining porous SiOC ceramic powder by preparation of wood powder andsolid polysiloxane; secondly, combining the porous SiOC ceramic powder with graphene oxide; and thirdly, preparing a porous SiOC / graphene composite material by employing a thermal reduction method. Aporous template comes from the wood powder and also can come from bagasse, straw, tobacco stalk and the like, and the problem of waste recycling can be solved; moreover, a large amount of negative charges exist on a surface of graphene oxide, a graphene oxide / SiOC composite material with an ordered structure can be formed, and a porous-passage composite negative electrode material can be obtainedafter thermal reduction; and by the porous structure of the composite material, the volume change of SiOC during the charge-discharge process of a lithium ion battery can be reduced, meanwhile, the conductivity of the composite material is improved, and the defects of irreversible capacity loss and voltage lagging of SiOC can be effectively overcome.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a SiOC composite negative electrode material for assembling the negative electrode of a lithium ion battery and a preparation method thereof. Background technique [0002] As a key component of lithium-ion batteries, anode materials for lithium-ion batteries directly affect the performance of lithium-ion batteries. At present, graphitized carbon materials are widely used as anode materials for commercial lithium-ion batteries, which exhibit high Coulombic efficiency and excellent cycle stability at low cost. However, graphite, as a commercial electrode material, has a low specific capacity (theoretical value is 372mAh / g), which cannot meet the requirements of high power and high rate performance. Therefore, the research and development of new high specific capacity and stable lithium-ion battery anode materials has become a research hotspot. [0003] Poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M10/0525
CPCH01M4/602H01M10/0525Y02E60/10
Inventor 潘建梅沈伟申小娟陈彪孙昊宇赵宇轩严学华程晓农
Owner JIANGSU UNIV
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