Ultrathin Titanate Nanosheets/Graphene Films Derived from Confined Transformation for Excellent Na/K Ion Storage

作者：Zeng, Cheng; Xie, Fangxi; Yang, Xianfeng; Jaroniec, Mietek; Zhang, Lei^*; Qiao, Shi-Zhang^*

来源：Angewandte Chemie - International Edition, 2018, 57(28): 8540-8544.

DOI：10.1002/anie.201803511

• anode materials
• sandwich structures
• sodium titanate
• sodium-ion batteries
• ultrathin nanosheets

Confined transformation of assembled two-dimensional MXene (titanium carbide) and reduced graphene oxide (rGO) nanosheets was employed to prepare the free-standing films of the integrated ultrathin sodium titanate (NTO)/potassium titanate (KTO) nanosheets sandwiched between graphene layers. The ultrathin Ti-based nanosheets reduce the diffusion distance while rGO layers enhance conductivity. Incorporation of graphene into the titanate films produced efficient binder-free anodes for ion storage. The resulting flexible NTO/rGO and KTO/rGO electrodes exhibited excellent rate performances and long cycling stability characterized by reversible capacities of 72mAhg(-1) at 5Ag(-1) after 10000 cycles and 75mAhg(-1) after 700 cycles at 2Ag(-1) for sodium and potassium ion batteries, respectively. These results demonstrate the superiority of the unique sandwich-type electrodes.

• 出版日期2018-7-9
• 单位天津大学; 华南理工大学