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The spinel Li4Ti5O12 (LTO) has been doped by Ca2+ via a solid-state reaction route, generating highly crystalline Li3.9Ca0.1Ti5O12 powders in order to improve the electrochemical performance as an anode. The structure changes, morphologies, and electrochemical properties of the resultant powders have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and cyclic voltammetry (CV), respectively. Crystal structure and composition were analyzed, and results were obtained with various tests of LTO. Electrochemical measurements revealed that Li3.9Ca0.1Ti5O12 anodes exhibit better rate capability, better cycling stability, and a higher specific capacity than pure LTO anodes.

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Lithium sulfur is considered as one of the most potential candidate cathode material using in high‐energy lithium ion batteries. In this work, the N‐doped porous carbon spheres with an appropriate N doping (4.33 wt%) were synthesized by Pyrrole through the sulfuric acid triggered polymerization and carbonized directly. The diameter of obtained N‐doped porous carbon spheres was in the range of 100–500 nm, with the pore size of 2–20 nm. Nitrogen‐doped carbon/Sulfur cathode with 61.8 wt% sulfur content exhibits excellent performance in high‐energy lithium sulfur battery. The specific capacity reached 1660 mAh g −1 at 0.05 C and about 500 mAh g−1 at 2 C.

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