A Carbon‐Free Li 2 TiO 3 /Li 2 MTi 3 O 8 (M═Zn 1/3 Co 2/3 ) Nanocomposite as High‐Rate and Long‐Life Anode for Lithium‐Ion Batteries

A carbon‐free biphasic Li 2 TiO 3 /Li 2 MTi 3 O 8 (M═Zn 1/3 Co 2/3 ) nanocomposite has been rationally designed and successfully synthesized via co‐precipitation and solid‐state reactions, which can effectively improve the Li + kinetics of lithium titanium oxide anodes. The biphasic intergrowth is beneficial to the size decrease of primary grains and further shortens the Li + migration path. Cyclic voltammetry (CV) analyses confirm the enhanced Li + diffusion coefficient as high as 4.22 × 10 −11  cm 2  s −1 . Furthermore, the biphasic nanocomposite delivers a large reversible capacity of ≈200 mAh g −1 at a rate of 0.1 C with a low average voltage of 0.8 V (vs Li/Li + ) and an outstanding cycling stability of the capacity (≈100% retention even after 500 cycles at 0.5 C). Furthermore, a superior high‐rate capability, ≈133 mAh g −1 even at a high rate of 20 C, can be achieved. The biphasic intergrowth strategy gives a new insight into developing high‐rate and durable titanium‐based anode for lithium‐ion batteries.