A series of spinel-doped lithium manganese oxides, Li x Mn y Ti z O 4.00 ͑0.973 Յ x Յ 1.018, 1.893 Յ y Յ 1.959, z Ϸ 0.050͒, Li x Mn y Ti z Ni m O 4.00 ͑0.981 Յ x Յ 1.010, 1.903 Յ y Յ 1.951, z Ϸ 0.050, m Ϸ 0.030͒, Li x Mn y Ti z Co m O 4.00 ͑0.953 Յ x Յ 1.004, 1.912 Յ y Յ 1.968, z Ϸ 0.050, m Ϸ 0.009͒, have been prepared using the solid-state reaction of a titanium-doped electrolytic manganese dioxide, lithium hydroxide, and doping agents. The oxides have been characterized using several advanced techniques, such as X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared analysis, Raman spectroscopy, thermogravimetric analysis, differential scanning calorimetry, cyclic voltammograms and charge/discharge cycles. The experimental results show that the Li 0.973 Mn 1.893 Ti 0.048 O 4.00 sample, prepared at 600°C, showed the best electrochemical performance during the charge/discharge tests and storage process in all samples. In the voltage region of 4.6-2.5 V, the initial capacities of the fresh, discharge-storage, and charge-storage cell for the Li 0.973 Mn 1.893 Ti 0.048 O 4.00 sample are 206, 144, and 175 mA h g −1 , respectively. In the voltage region of 4.3-3.4 V, the capacity fade of the sample was 5.3% in 150 cycles. After being doped by titanium ions, the spinel Li 0.973 Mn 1.893 Ti 0.048 O 4.00 exhibits a lower lattice constant and stronger Mn-O bond than a pure spinel does.
