Bismuth nanorod networks confined in a robust carbon matrix as long-cycling and high-rate potassium-ion battery anodes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Detail(s)

Original languageEnglish
Pages (from-to)8440-8446
Journal / PublicationJournal of Materials Chemistry A
Volume8
Issue number17
Online published6 Apr 2020
Publication statusPublished - 7 May 2020

Abstract

Bismuth (Bi) is a promising alloy-type material for potassium-ion batteries (KIBs). However, its large volume variation during the cycling process remains a great challenge to its practical application. Here, a one-step approach was developed to synthesize a novel Bi-based composite structure comprising Bi nanorod networks confined in a N, S co-doped carbon matrix (Bi∈NS-C). As an anode, the Bi∈NS-C structure successfully integrated the merits of the micro-sized N, S co-doped carbon matrix, which functioned concurrently as a conductive framework and a robust buffer for large volume variation, and the network structure of Bi nanorods which enhanced the reaction kinetics and accommodated the large strain originating from the alloying/dealloying process. As a result, the Bi∈NS-C electrodes exhibited an excellent overall performance, i.e., high rate capabilities of 338 mA h g-1 and 289 mA h g-1 at current densities of 0.5 and 6 A g-1, respectively, and outstanding long-term cycling stability with 91% capacity retention at 5 A g-1 after 1000 cycles. Furthermore, a full KIB with hexacyanoferrate as the cathode and Bi∈NSC as the anode was assembled, which was demonstrated to be able to deliver a decent energy density of 295 W h kg-1 and superior cycling stability with 83% capacity retention after 800 cycles.

Citation Format(s)

Bismuth nanorod networks confined in a robust carbon matrix as long-cycling and high-rate potassium-ion battery anodes. / Jiao, Tianpeng; Wu, Shuilin; Cheng, Junye; Chen, Da; Shen, Dong; Wang, Hui; Tong, Zhongqiu; Li, Heng; Liu, Bin; Kai, Ji-Jung; Lee, Chun-Sing; Zhang, Wenjun.

In: Journal of Materials Chemistry A, Vol. 8, No. 17, 07.05.2020, p. 8440-8446.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal