Uniform Metal Sulfide@N-doped Carbon Nanospheres for Sodium Storage: Universal Synthesis Strategy and Superior Performance

Energy & Environmental Materials

article

Kai Yang¹  Hao Fu¹  Yixue Duan³  Manxiang Wang¹  Minh Xuan Tran⁵  Joong Kee Lee⁵  Woochul Yang¹  Guicheng Liu¹ 

[1] Department of Physics, Dongguk University;Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology;College of Physics and Electronic Information, Yan'an University;Center for Energy Storage Research, Clean Energy Institute, Korea Institute of Science and Technology

关键词: anode materials;    core–shell structure;    nitrogen-doped carbon;    ring-opening reaction;    transition-metal sulfide;   

DOI  :  10.1002/eem2.12380

来源: Wiley

【 摘 要 】

Nitrogen-doped carbon-coated transition-metal sulfides (TMS@NCs) have been considered as efficient anodes for sodium-ion batteries. However, the uncontrollable morphology and weak core–shell binding forces significantly limit the sodium storage performance and life. Herein, based on the reversible ring-opening reaction of the epoxy group of the tertiary amino group-rich epoxide cationic polyacrylamide (ECP) at the beginning of hydrothermal process (acidic environment) and the irreversible ring-opening (cross-linking reactions) at the late hydrothermal period (alkaline environment), 47 nm-sized ZnS@NCs were prepared via a one-pot hydrothermal process. During this process, the covalent bonds formed between the ZnS core and elastic carbon shell significantly improved the mechanical and chemical stabilities of ZnS@NC. Benefiting from the nanosize, fast ion/electron transfer, and high stability, ZnS@NC exhibited a high reversible capacity of 421.9 mAh g−1 at a current density of 0.1 A g−1 after 1000 cycles and a superior rate capability of 273.8 mAh g−1 at a current density of 5 A g−1. Moreover, via this universal synthesis strategy, a series of TMS@NCs, such as MoS2@NC, NiS@NC, and CuS@NC were developed with excellent capacity and cyclability.

【 授权许可】

Unknown