This doped LiCoO 2 displays an exceptionally high capacity of 190 mAh/g, cyclability with 96% capacity retention over 50 cycles and significantly enhanced rate = , The dopants are found to reside in the crystal lattice of LiCoO 2, where La works as a pillar to increase the c-axis distance and Al as a positively charged center, facilitating Li + diffusion, stabilizing the structure and suppressing the phase transition during cycling, even at a high cut-off voltage of 4.5 V. La and Al are concurrently doped into Co-containing precursors, followed by high-temperature calcination with lithium carbonate. Here we develop a doping technique to tackle this long-standing issue of instability and thus increase the capacity of LiCoO 2. Consequently, commercial LiCoO 2 exhibits a maximum capacity of only ~165 mAh/g. Li/Li + causes significant structural instability and severe capacity fade. However, cycling LiCoO 2-based batteries to voltages greater than 4.35 V vs. Here, lithium cobalt oxides (LiCoO 2) possess a high theoretical specific capacity of 274 mAh/g.
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