Close-spaced thermally evaporated 3D Sb2Se3 film for high-rate and high-capacity lithium-ion storage. Issue 21 (25th May 2021)

• Record Type: Journal Article
• Authors: Li, Wangyang; Deng, Liying; Wang, Xinghui; Cao, Jiaqi; Xie, Yonghui; Zhang, Qiaoli; Zhang, Hong; Deng, Hui; Cheng, Shuying
• Is Part Of: Nanoscale. Volume 13:Issue 21(2021)
• Page Start: 9834
• Page End: 9842
• Publication Date: 2021-05-25
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d1nr01585k
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : A 3D-structured Sb2 Se3 film (3D-SSF) with controllable microstructures was developed through a modified close-spaced rapid thermal evaporation to form an additive-free anode with current-regulated high-rate Li-ion storage. Abstract : As a key factor for fast-charging lithium-ion batteries (LIBs), high-rate anode materials that can recharge in a few minutes have aroused increasing attention. However, high-rate performance is always accompanied by low theoretical capacities, such as the widely known high-rate electrode of Li4 Ti5 O12 (175 mA h g −1 ), which severely limits its large-scale implementation in the development of high power density LIBs. Here, we report a modified close-spaced thermal evaporation process to deposit 3D-structured Sb2 Se3 films (3D-SSF) with tunable morphology as an additive-free anode for LIBs. After a high-rate activation process, 3D-SSF exhibits a flatter discharge plateau than the reported results and could deliver a high capacity of 471 mA h g −1 at an ultrahigh current density of 21 440 mA g −1, which is superior to the widely known high-rate Li4 Ti5 O12 anode (over 150 mA h g −1 at 8750 mA g −1 ). Moreover, we reveal a current-regulated Li-ion storage mechanism where 3D-SFF undergoes a synergistic conversion and alloying reaction at low current densities, while an alloying reaction-dominated process at high rates. Beyond that, full batteries with excellent rate performance were successfully assembled by pairing with homemade LiFePO4 (LFP) as the cathode.