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A new coordination polymer based on an aromatic carbonyl ligand is prepared and investigated as a positive active material for lithium ion batteries, namely, [Li2(C6H2O4)] (1). It is synthesized by the dehydration of [Li2(C6H2O4)·2H2O] (2). These compounds are characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), elemental analysis (EA), single crystal X-ray diffraction methods and powder X-ray diffraction (XRD). As positive material, compound 1 has an initial discharge capacity of 176 mAh·g−1 and a columbic efficiency of 93.18% in the first cycle. It might provide a new method for finding new positive-electrode materials in lithium ion batteries.

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LiNi 0.8 Co 0.2 O 2 and Mg-doped LiNi 0.8 Co 0.2 O 2 have been synthesized via the rheological phase reaction route. The particle size distribution is obtained using laser scattering measurements. The morphological features are observed by a scanning electron microscope. Electrochemical tests show that the Mg-doped LiNi 0.8 Co 0.2 O 2 exhibits an improved capacity, cycling stability, and rate performances compared to undoped samples. The samples are also characterized by cyclic voltammetry and electrochemical impedance spectroscopy. Furthermore, possible mechanisms of Mg-doping are discussed based on the defect reaction.