Preparation method and application of spherical carbon electrode material

Abstract

The invention discloses a preparation method and application of a spherical carbon electrode material, and belongs to the field of new energy material preparation. The method is characterized in that raw materials are uniformly mixed and are then subjected to ultrasonic dispersion treatment; obtained phenolic resin microspheres are dried and are then put into inert gas for carbonization to obtain the spherical carbon electrode material, or after the carbonization, activating treatment is performed in carbon dioxide to obtain the spherical carbon electrode material. The prepared spherical carbon electrode material is used for preparing a lithium ion battery negative electrode material. The carbon electrode material standard spherical structure obtained by the method has small particle size, uniform granularity and large specific surface area (964m<2>g<-1>); the electrode material obtained after activation in carbon dioxide at high temperature is of a standard spherical structure, and has uniform granularity, no agglomeration, ultrahigh superficial area (2798.8794 m<2> / g), uniform hole distribution and average pore size of 2.0nm; the spherical carbon electrode material is applied to the lithium ion battery negative electrode material; the specific capacity is high; the decay is slow; the electrochemical performance is stable.

Description

technical field [0001] The invention relates to a preparation method and application of a spherical carbon electrode material, belonging to the field of new energy material preparation. Background technique [0002] Energy is the main factor affecting social development, and also the basis of economic and social development. Due to the advantages of high energy density, long cycle life and no memory effect, lithium-ion batteries occupy a very important position in the energy technology neighborhood. Therefore, the research on electrode materials for lithium-ion batteries has become a hot spot in current material research. [0003] Lithium-ion battery anode materials are an important part of lithium-ion batteries, and the composition and structure of anode materials have a decisive impact on the electrochemical performance of lithium-ion batteries. As a commercial anode material for lithium-ion batteries, graphitized carbon still has disadvantages such as low specific capaci...

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Problems solved by technology

However, graphene and carbon nanotubes have defects such as low initial efficiency, no discharge platform, poor cycle performance, and voltage hysteresis as electrode materials, and the harsh preparation conditions are not conducive to large-scale production and restrict their development. Therefore, seeking a Anode materials with high capacity and good cycle performance play an important role in promoting the development of lithium-ion batteries

[0006] The nano-carbon microspheres and ultra-high specific surface area porous spherical carbon microspheres prepared by this method are applied to the negative electrode materials of lithium-ion batteries. Uniform, uniform pore size distribution, porous carbon microspheres with ultra-high specific surface area (2798.8794 m² / g), 210mA g -1 The first charge and discharge performance under the current density reached 2575.9 mAh g -1 , the capacity remained at 998 mAh g after 30 cycles -1 , such a high specific capacity has not been reported in the application of carbon-based materials in lithium-ion battery anodes

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