Rechargeable lithium-ion batteries (RLIBs) have shown potential as future batteries for electric vehicles and portable electronics. This results from their high energy density, high power, environmental safety, low cost electrode materials and long life. While during the charge/discharge processes the lithium-ions intercalate and de-intercalate from the electrodes, such that the performance of the RLIBs depends mostly on the material properties. This perspective has led to the development of novel anode materials to advance from the use of graphite and other carbon based materials. Some drawbacks of these materials include safety concerns, low operating voltage, and shorter lifetime. The spinel-type lithium titanate (Li₄Ti₅O₁₂, LTO) as a promising anode material has become more attractive for its negligible lattice changes during cycling, high theoretical capacity (175 mAh/g), flat voltage plateau of 1.55 V vs Li/Li⁺, long cycling stability and environmental compatibility. This outlook introduced more studies on the improvement of the low electronic conductivity and low diffusion coefficient of the Li-ions in LTO which hinders the advancement of the LTO to meet requirements for high capacity large scale applications. In this work, a comprehensive study of doping with aluminium (Al) on the titanium site was carried out with aim to improve the capacity and cyclability performance. Al-doped LTO in the form of Li₄Ti_5-xAl_xO₁₂ (x = 0, 0.05, 0.1, 0.15, 0.2) was synthesized via a conventional solid state reaction in an air atmosphere. Al-doping does not change the plateau voltage (1-2.5 V) of LTO during cycling, but showed a slight increase in the polarization of the electrode especially for 0.05Al. Li₄Ti_4.85Al_0.15O₁₂ demonstrated an increase in the initial discharge capacity (172 mAh/g) relative to Li₄Ti₅O₁₂ (154 mAh/g) and an improved rate capability and cyclability. The enhanced electronic conductivity and rate capability can be attributed to the mixture of the redox couple of Ti³⁺/Ti⁴⁺ and high Li⁺ diffusivity. Moreover, the enhanced cyclability results from the stability of Al-O than for Ti-O in the octahedral coordination polyhedron, thus strengthening the stability of the spinel structure.