Preparation of TiO2/Marimo carbon composite

Oxide electrode materials have been studied for use in lithium secondary batteries. Carbon black is added to the oxide electrode as a conductive additive. However, it is very difficult to uniformly disperse the nano-size carbon. We applied the Marimo carbon as a new carbon material for making a new composite. This carbon is a kind of carbon nanofilament (CNF). The Marimo carbon consists of many CNFs, and the CNFs are interwoven to form a spherical secondary shape. The Marimo carbon has a sufficient space volume between the CNFs. We prepared TiO2 from a liquid phase using a hydrothermal synthesis method to compose with the carbon. The prepared sample is anatase TiO2, and it contains carbon. The charge and discharge characteristics were measured at the 0.1 C rate between 1.0 V and 3.0 V vs. Li using a coin-type cell. The cell was able to be charged and discharged. The charge capacity was 172 mAhg-1 and discharge capacity was 200 mAhg-1.