T-Nb₂O₅ as a promising candidate anode has attracted great interest for ultrafast lithium-ion batteries (LIBs) due to its good ion conductivity and safety. However, the relatively inferior electric conductivity and low capacity greatly limit its commercial application. Herein, a trace Co doping strategy is reported to enhance the electric conductivity and redox chemistry of T-Nb₂O₅. The original Nb sites are partially replaced by Co, which endows Co-Nb₂O₅ with high electronic conductivity without affecting the crystalline host structure, meanwhile induces multielectron redoxes of Nb⁵⁺/Nb⁴⁺ and Nb⁴⁺/Nb³⁺ during lithium-ion insertion process. As a LIB anode, the resulting Co-Nb₂O₅ nanoparticles display a high discharge capacity (256.1 mAh g⁻¹ at 0.1 A g⁻¹), superior rate capability (141.7 mAh g⁻¹ at 5 A g⁻¹) and good cycling stability (179.7 mAh g⁻¹ at 1 A g⁻¹ after 500 cycles). The ultrafast lithium storage and high-capacity electrochemical performance of Co-Nb₂O₅ owing to its high electric conductivity and multielectron redox upon lithiation/delithiation. The selective transition metal doping strategy provides a new direction for the development of new insertion-type oxide anodes towards fast charging and high-capacity LIBs.

T-Nb ₂ O ₅作为有前途的候选负极，由于其良好的离子电导率和安全性，引起了超快锂离子电池（LIB）的极大兴趣。然而，相对较差的导电性和低容量极大地限制了其商业应用。_{在此，报道了一种痕量 Co 掺杂策略以增强 T-Nb 2} O ₅的电导率和氧化还原化学。原有的Nb位置被Co部分取代，赋予Co-Nb ₂ O ₅高电子导电性而不影响晶体主体结构，同时诱导Nb ⁵⁺ /Nb ⁴⁺和Nb ⁴⁺ /Nb的多电子氧化还原³⁺在锂离子插入过程中。作为 LIB 负极，所得 Co-Nb ₂ O ₅纳米粒子显示出高放电容量（256.1 mAh g ^-1在 0.1 A g ^-1）、优异的倍率性能（141.7 mAh g ^-1在 5 A g ^-1）和良好的循环稳定性（ 500 次循环后在 1 A g ^{-1下为 179.7 mAh g -1}）。_{Co-Nb 2} O ₅的超快储锂和高容量电化学性能由于其高电导率和锂化/脱锂时的多电子氧化还原。选择性过渡金属掺杂策略为新型插入式氧化物负极向快速充电和高容量锂离子电池的发展提供了新方向。