@article{Yang2023, 
author = {Kai Yang and Hao Fu and Yixue Duan and Manxiang Wang and Minh Xuan Tran and Joong Kee Lee and Woochul Yang and Guicheng Liu},
title = {Uniform Metal Sulfide@N-doped Carbon Nanospheres for Sodium Storage: Universal Synthesis Strategy and Superior Performance},
year = {2023},
journal = {Energy & Environmental Materials},
volume = {6},
number = {2},
keywords = {anode materials, core–shell structure, nitrogen-doped carbon, ring-opening reaction, transition-metal sulfide},
url = {https://www.sciopen.com/article/10.1002/eem2.12380},
doi = {10.1002/eem2.12380},
abstract = {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.}
}