Engineering the Catalytic Superlattices for Highly Reversible Sodium‐Ion Storage with A high Compositional Conversion Degree
Jingyi Wang, Tongfeng Liu, Biao Chen, Zijia Qi, Haonan Xie, Guangxuan Wu, Liyang Xiao, Jingwen Zhou, Liying Ma, Fang He, Chunnian He, Wenbin Hu, Naiqin Zhao
Abstract
Abstract A major obstacle of transition metal disulfides in sodium‐ion batteries is compositional irreversible conversion, leading to fast capacity decay. Here, we propose to engineer a catalytic superlattice structure for achieving a record‐high compositional reversible conversion degree (≈100 %). The superlattice is constructed by alternately stacking MoS 2 layers and nitrogen/oxygen co‐doped reduced graphene oxide‐supported single‐atom metal layers (MoS 2 /M‐ONG SL, M=Fe, Co, Ni, Cu, Zn) with 100 % MoS 2 /M‐ONG interfaces, in which the metal atoms bridge the two layers through S−M‐O chemical bonds. Using MoS 2 /Co‐ONG SL as a model, the unique superlattice structure shows excellent electron and Na + transport properties during discharge and charge. Moreover, the Co‐ONG boosts Na 2 S adsorption and decomposition by forming Co‐3d and S‐3p hybridization. As a result, the MoS 2 /Co‐ONG SL shows a high compositional reversible conversion degree(≈100 %), as proven by a series of in‐/ex situ spectroscopic analyses. As a result, the MoS 2 /Co‐ONG SL exhibits a stable cycling stability of 300.7 mAh g −1 after 2000 cycles at 2 A g −1 , with an ultrasmall capacity decay rate of 0.41 % per 100 cycles. This work offers a noteworthy perspective on the design and fabrication of conversion‐type materials, emphasizing the crucial role of interface engineering in achieving excellent bidirectional reaction kinetics.