High-Capacity Sb/Fe2S3 Sodium-Ion Battery Anodes Fabricated by a One-Step Redox Reaction, Followed by Ball Milling with Graphite

• DOI: 10.1021/acsami.3c01223
• Publication Date: 2023-05-11T16:50:12Z
• Authors: Ying Chu; Peng Wang; Yihong Ding; Jie Lin; Xinxin Zhu; Shiqiang Zhao; Huile Jin; Tianbiao Zeng
• Keywords: Sodium-ion battery; Nanosheet

Antimony (Sb) has been considered a promising anode for sodium-ion batteries (SIBs) owing to its high theoretical capacity (660 mA h g-1) and low redox voltage (0.2-0.9 V vs Na+/Na). However, the degradation caused by volumetric variation during battery discharge/charge hinders practical application. Herein, guided DFT calculation, Sb/Fe2S3 was fabricated annealing Fe Sb2S3 mixed powder. Next, blended with 15 wt % graphite ball milling, yielding nano-Sb/Fe2S3 anchored on an exfoliated composite (denoted as Sb/Fe2S3-15%). When applied of SIBs, Sb/Fe2S3-15% delivered reversible capacities 565, 542, 467, 366, 285, 236 g-1 at current rates 1, 2, 4, 6, 8, 10 A g-1, respectively, surpassing most Sb-based anodes. The co-existence highly conductive Fe2S3 Sb minimizes polarization anode. Our experiments proved that phases were cycling, can accelerate Na+ diffusion e- conduction. proposed synthesis method this work also be applicable synthesize various antimony/transition metal sulfide heterostructures (Sb/M1-xS), which may in series fields.