Heterogeneous‐Structured Molybdenum Diboride as a Novel and Promising Anode for Lithium‐Ion Batteries

Author:

Chen Yuxiang1,Liang Ying2,Zhou Chuancong2,Li Zulai1,Wu Daoxiong2,Li Jing2,Dong Peng3,Zhang Yingjie3,Tian Xinlong2ORCID,Shi Xiaodong2

Affiliation:

1. Faculty of Material Science and Engineering National & Local Joint Engineering Laboratory of Advanced Metal Solidification Forming and Equipment Technology Kunming University of Science and Technology Kunming 650093 China

2. School of Marine Science and Engineering State Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou 570228 China

3. National and Local Joint Engineering Laboratory for Lithium‐ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan Province Kunming University of Science and Technology Kunming 650093 China

Abstract

AbstractWith the development of electric vehicles, exploiting anode materials with high capacity and fast charging capability is an urgent requirement for lithium‐ion batteries (LIBs). Borophene, with the merits of high capacity, high electronic conductivity and fast diffusion kinetics, holds great potential as anode for LIBs. However, it is difficult to fabricate for the intrinsic electron‐deficiency of boron atom. Herein, heterogeneous‐structured MoB2 (h‐MoB2) with amorphous shell and crystalline core, is prepared by solid phase molten salt method. As demonstrated, crystalline core can encapsulate the honeycomb borophene within two adjacent Mo atoms, and amorphous shell can accommodate more lithium ions to strengthen the lithium storage capacity and diffusion kinetics. According to theoretical calculations, the lithium adsorption energy in MoB2 is about −2.7 eV, and the lithium diffusion energy barrier in MoB2 is calculated to be 0.199 eV, guaranteeing the enhanced adsorption capability and fast diffusion kinetic behavior of Li+ ions. As a result, h‐MoB2 anode presents high capacity of 798 mAh g−1 at 0.1 A g−1, excellent rate performance of 183 mAh g−1 at 5 A g−1 and long‐term cyclic stability for 1200 cycles. This work may inspire ideas for the fabrication of borophene analogs and two‐dimensional metal borides.

Funder

China Postdoctoral Science Foundation

National Natural Science Foundation of China

Publisher

Wiley

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