Balancing the Ion/Electron Transport of Graphite Anodes by a La-Doped TiNb 2 O 7 Functional Coating for Fast-Charging Li-Ion Batteries.

A functional coating layer (FCL) is widely applied in fast-charging lithium-ion batteries to improve the sluggish Li + transport kinetics of traditional graphite anodes. However, blindly increasing the Li + conductivity for FCL reduces the overall electron conductivity of the anodes. Herein, we decoupled the effect of La-doping on TiNb 2 O 7 (TNO) in terms of the phase evolution, Li + /electron transport, and lithiation behavior, and then proposed a promising La 0.1 TNO FCL with balanced Li + /electron transport for a fast-charging graphite anode. By optimizing the doping concentration of La, more holes are introduced into the TNO as electron carriers without causing lattice distortion, thus maintaining the fast Li + diffusion channel in TNO. As a result, the graphite with La 0.1 TNO FCL delivers an excellent capacity of 220.2 mAh g -1 (96.3% retention) after 450 cycles at 3 C, nearly twice that of the unmodified one.