Morphology Control of ZnO for Li-Ion Battery Anode

摘要

Zinc oxide is a promising anode material of Li-ion battery because it has a higher theoretical capacity in comparison with a conventional graphite anode. A serious problem, however, still remains: a reversible capacity of ZnO rapidly decreases with increasing charge-discharge cycle owing to its significant volume changes and a resulting stress. To solve the problem, this article reviews ZnO anodes with unique morphologies prepared by simple chemical syntheses, a chemical bath deposition, a precipitation method, and a hydrothermal synthesis. The growth processes and the morphologies are summarized in relation to their anode performances. The anode performances can be improved by the stress accommodation in the unique morphologies such as nanosheets, nanocomposites containing Li-inactive matrix, radial rods, and nanorod arrays.