Nanometer lithium titanate/graphene composite negative electrode material and preparation process thereof

A nano-lithium titanate and graphene composite technology, which is applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrical components, etc., can solve problems such as difficulty in realizing large-scale industrial production, limiting the wide application of composite materials, and complex synthesis processes. Achieve the effect of improving ion transport capacity, good electrochemical performance, and simple process
CN102376937AInactive Publication Date: 2012-03-14INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Publication Date
2012-03-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the field of negative electrode materials of lithium ion batteries, and specifically to a nanometer lithium titanate / graphene composite negative electrode material and a preparation process thereof. According to the invention, micron-sized lithium titanate prepared by the solid phase method is subjected to ultrafine ball milling to obtain nanometer powder, and the nanometer lithium titanate powder and graphene are uniformly compounded and subjected to heat treatment so as to obtain a high performance lithium ion battery negative electrode material; the invention is characterized in that uniform distribution of graphene in the nanometer lithium titanate powder is realized through in situ compounding; the weight of graphene in the composite negative electrode material accounts for 0.5 to 20%, and the weight of lithium titanate accounts for 80 to 99.5%. The lithium ion battery negative electrode material has good electrochemical performance, 1C capacity greater than 165 mAh / g, 30C capacity greater than 120 mAh / g and 50C capacity greater than 90 mAh / g. Nanometer lithium titanate in the lithium ion battery negative electrode material prepared in the invention has high phase purity; the preparation process of the material is simple and is easy for industrial production.
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Description

technical field

[0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a nanometer lithium titanate / graphene composite negative electrode material and a preparation method thereof. Background technique

[0002] In recent years, lithium-ion batteries have been widely used in mobile communications, digital cameras, notebook computers and other portable electronic devices, as well as military defense and aerospace fields due to their outstanding properties such as high energy density, long cycle life, and low self-discharge. With the rapid development of lithium-ion battery technology, lithium-ion power batteries used as power are attracting more and more attention. Well-known automobile companies at home and abroad have also begun to develop high-power batteries that can meet the needs of electric vehicles and hybrid vehicles. , High-rate new lithium-ion battery electrode materials.

[0003] As a negative electrod...

Claims

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