Li 4Ti5O12 is prepared by a gel-combustion method using polyvinylpyrrolidone as chelating agent and fuel, TiO 2, and Li(OAc) in H2O at pH 3 (100 C) before igniting the dried gel and subsequent calcination in air (800 C, 8 h). Structural and electrochemical properties of the sample are compared with those obtained by conventional solid state reaction (SSR). The sub-microscale Li 4Ti5O12 shows a high phase purity, close stoichiometry, and a grain size smaller than that of samples prepared by SSR. Li-ion batteries with the Li 4Ti5O12 anode exhibit excellent reversible capacities of 167.6, 160.7, 152.9, and 144.2 mAh/g, at current densities of 0.5, 1, 3, and 5 C, resp., making it a promising candidate for applications in high-rate lithium ion batteries.
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