Preparation method and application of octahedron-shaped cobaltosic oxide anode material for lithium ion battery

Abstract

The invention discloses a preparation method of an octahedron-shaped cobaltosic oxide anode material for a lithium ion battery. During the preparation process of such a sample, the octahedron-shaped cobaltosic oxide anode material with a porous structure is obtained by using a soft-template-assisted sol-gel method. Such the cobaltosic oxide sample with the internal tunnel structure and the unique octahedron morphology is capable of improving infiltration capability of an electrolyte and buffering volume change during the discharging / charging process of lithium ions, and has higher lithium storage capacity and good cycle stability. The preparation method has the advantages of mild reaction conditions, simplicity and controllability, easy quantity production.

Description

technical field [0001] The invention relates to a preparation method of negative electrode materials for lithium ion batteries. Background technique [0002] The rapid development and application of electric vehicles has increased the demand for lithium-ion battery materials. At present, the negative electrode active materials of commercial lithium-ion batteries are mostly graphite materials, and the low theoretical capacity of graphite materials also limits the capacity of lithium-ion batteries. Performance improvement and wide application, so in recent years, researchers have begun to try to find new negative electrode materials for lithium batteries with high capacity, excellent cycle performance and rate performance. The theoretical capacity of cobalt tetroxide material can reach 890 mAh g -1 , thus becoming a research hotspot of negative electrode materials, but the research results also show that the electrical conductivity of tricobalt tetroxide material is poor, the...

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Problems solved by technology

[0002] The rapid development and application of electric vehicles has increased the demand for lithium-ion battery materials. At present, the negative electrode active materials of commercial lithium-ion batteries are mostly graphite materials, and the low theoretical capacity of graphite materials also limits the capacity of lithium-ion batteries. Performance improvement and wide application, so in recent years, researchers have begun to try to find new negative electrode materials for lithium batteries with high capacity, excellent cycle performance and rate performance

The theoretical capacity of cobalt tetroxide material can reach 890 mAh g -1 , thus becoming a research hotspot of negative electrode materials, but the research results also show that the electrical conductivity of tricobalt tetroxide material is poor, the electron transport rate inside the material and the intercalation\extraction rate of lithium ions are low, so its cycle performance and rate performance are difficult to meet practical requirements. need

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