To satisfy increasing power demands of mobile devices and electric vehicles, rationally designed electrodes with short diffusion length are highly imperative to provide highly efficient ion and electron transport paths for high-rate and long-life lithium-ion batteries. Herein, binder-free electrodes with the robust three-dimensional conductive network are prepared by assembling ultralong TiO₂ nanowires with reduced graphene oxide (RGO) sheets for high-performance lithium-ion storage. Ultralong TiO₂ nanowires are synthesized and used to construct an interconnecting network that avoids the use of inert auxiliary additives of polymer binders and conductive agents. By thermal annealing, a small amount of anatase is generated in situ in the TiO₂(B) nanowires to form abundant TiO₂(B)/anatase interfaces for accommodating additional lithium ions. Simultaneously, RGO sheets efficiently enhance the electronic conductivity and enlarge the specific surface area of the TiO₂/RGO nanocomposite. The robust 3D network in the binder-free electrode not only effectively avoids the agglomeration of TiO₂/RGO components during the long-term charging/discharging process, but also provides direct and fast ion/electron transport paths. The binder-free electrode exhibits a high reversible capacity of 259.9 mA h g⁻¹ at 0.1 C and an excellent cycling performance with a high reversible capacity of 111.9 mA h g⁻¹ at 25 C after 5000 cycles.

为了满足移动设备和电动汽车不断增长的功率需求，合理设计的扩散长度短的电极非常重要，以为高速率和长寿命的锂离子电池提供高效的离子和电子传输路径。在此，通过将超长TiO ₂纳米线与还原的氧化石墨烯（RGO）片组装在一起以制备高性能的锂离子电池，可以制备出具有坚固的三维导电网络的无粘合剂电极。合成了超长TiO ₂纳米线，并将其用于构建互连网络，从而避免使用聚合物粘合剂和导电剂的惰性辅助添加剂。通过热退火，在TiO ₂中原位产生少量的锐钛矿（B）纳米线形成丰富的TiO ₂（B）/锐钛矿界面，以容纳额外的锂离子。同时，RGO片材有效地提高了电子传导性并增大了TiO ₂ / RGO纳米复合材料的比表面积。无粘结剂电极中强大的3D网络不仅有效避免了TiO ₂ / RGO组分在长期充电/放电过程中的团聚，而且还提供了直接且快速的离子/电子传输路径。无粘合剂电极在5000次循环后，在0.1 C时具有259.9 mA h g ^-1的高可逆容量，在25 C时具有111.9 mA h g ^-1的高可逆容量。