Issue 24, 2020

Bismuth dots imbedded in ultralong nitrogen-doped carbon tubes for highly efficient lithium ion storage

Abstract

Bismuth (Bi) is a prospective alloying-type anode material for rechargeable lithium-ion batteries (LIBs) on account of its high theoretical gravimetric capacity. The main challenge faced with Bi-based anode materials, however, is the extremely severe volume expansion during charge/discharge, which generally causes severe structural degradation and an unstable solid–electrolyte interphase (SEI). Herein, a nanotube-shaped porous Bi–carbon hybrid is designed and fabricated through a facile template synthesis strategy. Ultrafine Bi nanodots are uniformly embedded and space-confined in nitrogen-doped hollow carbon nanotubes (referred to as Bi@NC), which are constructed employing MnO2 nanowires as a template followed by selective etching. The architecture of this unique Bi@NC nanostructure with ample internal voids gives a stable SEI during cycling and accommodates the volume variation of the entrapped Bi, while the ultralong tubular carbon framework with a large aspect ratio can provide continuous longitudinal conductive channels for rapid electron transfer. Benefiting from these features, the as-built Bi@NC composite exhibits superior Li-storage performance, as reflected by the outstanding high rate capability and durable cycling lifespan in LIBs (117 mA h g−1 at 10 A g−1; 470 mA h g−1 at 1.0 A g−1 after 2000 cycles). The excellent Li-storage property of Bi@NC associated with its structural advantages could provide inspiration for the rational design of other nanostructured alloying-based anode materials toward multifunctional electrochemical energy storage.

Graphical abstract: Bismuth dots imbedded in ultralong nitrogen-doped carbon tubes for highly efficient lithium ion storage

Supplementary files

Article information

Article type
Research Article
Submitted
24 Sep 2020
Accepted
17 Oct 2020
First published
19 Oct 2020

Inorg. Chem. Front., 2020,7, 4854-4864

Bismuth dots imbedded in ultralong nitrogen-doped carbon tubes for highly efficient lithium ion storage

X. Qiu, B. Wang, P. Jing, Y. Zhang, M. Zhang, Q. Wang, X. Chen, Y. Zhang and H. Wu, Inorg. Chem. Front., 2020, 7, 4854 DOI: 10.1039/D0QI01158D

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