Porous Cu2O/CuO nanocomposite films for lithium-ion batteries were directly deposited on foam nickel substrates via chemical bath deposition. The structural characteristics of the films were investigated by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. At a discharge/charge rate of 0.5 C, the films could readily reach a capacity greater than 350 mAh g(-1), as well as capacity retention over 96% after 35 cycles. When the current density was increased to 15 C, at least 32% of the capacity could be retained. More interestingly, the capacities of the films could be tuned by simply controlling the deposition temperature. The high surface area, short diffusion path, and good conduction of the Cu2O/CuO films were considered to be responsible for the excellent electrochemical performance. The present finding provides a new and easy approach to fabricate nanocomposite films with superior performance for lithium-ion batteries. (C) 2008 The Electrochemical Society. [DOI: 10.1149/1.3054309] All rights reserved.