Multi-core core-shell-structure silicon carbon composite negative pole material and preparation method thereof

A technology of negative electrode material and core-shell structure, which is applied in the field of lithium-ion battery composite negative electrode materials and its preparation, can solve the problems of electrode cycle performance degradation, limited commercial application, and material structure damage, and solve the problem of poor silicon conductivity and improve Capacity utilization rate and effect of improving tap density
CN103094533AActive Publication Date: 2013-05-08CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2013-05-08

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Abstract

The invention relates to a multi-core core-shell-structure silicon carbon composite negative pole material and a preparation method thereof. The preparation method comprises the following steps: 1. preparation method of high-dispersivity multi-core porous spheres; 2. preparation of high-dispersivity asphalt suspension; and 3. preparation of multi-core core-shell-structure silicon carbon composite negative pole material: adding the porous spheres prepared in the step 1 into the high-dispersivity asphalt suspension prepared in the step 2, carrying out ultrasonic dispersion, heating and drying by distillation while intensely stirring to remove the solvent, transferring the powder particles into a protective atmosphere, and holding at low temperature so that the asphalt liquid enters the inside of the porous spheres to enhance the binding strength between the silicon source and the conducting carbon mesh, carry out secondary coating on the silicon source, overcome the defects in the coating in the step 1 and enhance the capacity performance of the silicon; and carrying out high-heat treatment. The invention is simple and easy to implement, and has the advantage of high practicality. The prepared silicon carbon composite material has the advantages of high reversible capacity, designable capacity, favorable cycle performance, favorable heavy-current discharge capacity, high tap density and the like.
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Description

technical field

[0001] The invention belongs to the field of lithium ion battery materials and preparation methods thereof, and relates to a lithium ion battery composite negative electrode material and a preparation method thereof. Background technique

[0002] Lithium-ion batteries are widely used in various portable electronic devices and electric vehicles due to their advantages such as large specific energy, high working voltage, low self-discharge rate, small size, and light weight. The current commercial lithium-ion battery anode material is mainly graphite, but its theoretical capacity is only 372mAh g -1 , high rate charge and discharge capacity is low, poor low temperature performance and other reasons, can no longer meet the demand for high energy density power supply in the field of lithium ion battery applications. Therefore, it is extremely urgent to develop new anode materials for lithium-ion batteries with high specific capacity.

[0003] As an anode materi...

Claims

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