Preparation method of transitional metal oxide/carbon nanotube porous composite negative electrode material

Abstract

The invention discloses a preparation method of a transitional metal oxide / carbon nanotube porous composite negative electrode material. The preparation method comprises the steps of performing functionalization of carbon nanotubes, performing preparation of a transitional metal oxide / carbon nanotube precursor, performing preparation of the transitional metal oxide / carbon nanotube porous compositenegative electrode material, and the like. By virtue of the transitional metal oxide and the carbon nanotubes with high conductivity, a carbon nanotube embedded transitional metal oxide hollow spherical structure is formed, so that a three-dimensional conductive network is formed, thereby taking full advantages of high specific capacity of the transitional metal oxide and excellent conductivity of the carbon nanotubes, and obtaining the high-rate and high-cycle-stability negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a preparation method of a transition metal oxide / carbon nanotube porous composite negative electrode material. Background technique [0002] Carbon nanotubes (CNTs) have a special hollow network structure and are combined by C-C covalent bonds, and most of the C-C covalent bonds are sp2 hybridized, which has superior mechanical properties. At the same time, CNTs have small size, large specific surface area, The advantage of good conductivity. Moreover, compared with graphite, lithium ions can not only be inserted into the tube, but also can be inserted into the gap of the tube, with more lithium intercalation sites. [0003] The specific capacity of transition metal oxides is much higher than that of graphite materials, and they are cheap, non-polluting to the environment, and have higher safety. However, this material ...

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Problems solved by technology

However, this material also has great disadvantages: First, it produces severe volume expansion during charging and discharging, which leads to the pulverization of metal oxides, part of the electrode material falls off from the current collector, the battery capacity drops rapidly, and the cycle of the battery is stable. Secondly, the electronic conductivity of transition metal oxides is generally poor, the polarization of the electrode is serious during the charge and discharge process, the rate performance of the battery is very poor, and the charge and discharge capacity decays sharply under high current. These two shortcomings Greatly limit the commercialization of transition metal oxide anode materials