Electrochemical Performance of Lithium Ion Batteries Prepared with Sepiolite-derived Carbons and Lithium Transition Metal Oxide Positive Electrodes

The performance of a sepiolite-derived carbon as an anode material with different surface area characteristics was evaluated using LiNi _0.8Co _0.05Al _0.05O ₂ as the positive electrode material in lithium ion batteries. The specific capacity respect to the active cathode mass was 160 mAh/g for the first charge half cycle. The capacity of the same cathode in a half cell was 170 mAh/g, which indicates the ability of the sepiolite-derived carbon to cycle efficiently. Complementary in situ ⁷Li NMR measurements were performed on the anode material and on the whole cell to assist in the assignment of the lithium signals.