Rational Design of Yolk–Shell ZnCoSe@N‐Doped Dual Carbon Architectures as Long‐Life and High‐Rate Anodes for Half/Full Na‐Ion Batteries

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 17; no. 46; pp. e2101887 - n/a
• Main Authors: Feng, Jian, Luo, Shao‐hua, Yan, Sheng‐xue, Zhan, Yang, Wang, Qing, Zhang, Ya‐hui, Liu, Xin, Chang, Long‐jiao
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.11.2021
• Subjects: Anodes; Batteries; Bimetals; binary metal selenide; Carbon; Cobalt; Cycles; Electrochemical analysis; Electrode materials; Electron transfer; Ion storage; Kinetics; long‐term cycling; Nanotechnology; Nitrogen; n‐doped dual carbon; Rechargeable batteries; Selenides; Selenium; Sodium-ion batteries; Stability; yolk–shell architecture; Zinc
• ISSN: 1613-6810; 1613-6829; 1613-6829
• DOI: 10.1002/smll.202101887

Transition‐metal selenides (TMSs) have emerged as prospective anode materials for sodium ion batteries (SIBs), owing to their considerable theoretical capacity and intrinsic high electronic conductivity. Whereas, TMSs still suffer from poor rate capability and inferior cycling stability induced by sluggish kinetics and severe volume changes during de/sodiation processes. Herein, a hierarchical composite consisting of a zinc‐cobalt bimetallic selenide yolk and nitrogen‐doped double carbon shell (denoted as ZnCoSe@NDC) is engineered and fabricated successfully. The architecture of the as‐fabricated material improves the Na‐ion storage performance via increasing the electron transfer kinetics, accommodating volume expansion, and mitigating the generation of by‐products. As expected, the ZnCoSe@NDC electrode delivers superior sodium storage performance with long cycling stability (344.5 mAh g−1 at 5.0 A g−1 over 2000 long‐term cycles) and high‐rate performance (319.2 mAh g−1 at 10.0 A g−1). Meanwhile, the NVP@C//ZnCoSe@NDC full SIB cells are constructed successfully, retaining 96.3% of its initial capacity at 0.5A g−1 after 200 loops. The outstanding electrochemical performance and the construction of hybrid SIBs will have far‐reaching influences on the development of the various rechargeable batteries. A yolk‐shell‐structured zinc‐cobalt binary metal selenide @ nitrogen‐doped dual carbon nanocomposite (Zn‐Co‐Se@NDC) is reported. The continuous nitrogen‐doped carbon shell and internal voids can promote the ionic/electron transport and stabilize structures of electrodes upon cycling. When used as a promising anode for sodium ion batteries, the hybrid composites manifest superior electrochemical performance with high reversible capacity, long‐term cyclic stability and excellent rate capability.