Issue 30, 2019

Direct observation of reversible conversion and alloying reactions in a Bi2(MoO4)3-based lithium-ion battery anode

Abstract

Bi2(MoO4)3 has been evaluated as an interesting anode material for application in lithium-ion batteries (LIBs). When cycled in the voltage window of 0.01–2.50 V a specific charge capacity of more than 800 mA h g−1 is retained after 50 cycles. According to operando synchrotron X-ray diffraction (XRD) the long-range order is lost during the initial lithiation. Direct insight into the electronic changes during cycling is obtained from operando Bi L3- and Mo K-edge X-ray absorption near edge spectroscopy (XANES) data collected during the first 1.5 cycles. A redox pair with anodic reactions at 0.97 V and cathodic reactions at 0.59 V is ascribed to alloying of bismuth: 3Li + Bi ↔ 2Li + LiBi ↔ Li3Bi. Likewise, reactions are ascribed to redox processes of Mo. Notably, the use of a cycling range limited to 2.00 V does not allow for a complete reoxidation of Mo, which in turn limits the reversibility of the Mo redox reactions.

Graphical abstract: Direct observation of reversible conversion and alloying reactions in a Bi2(MoO4)3-based lithium-ion battery anode

Supplementary files

Article information

Article type
Paper
Submitted
01 Apr 2019
Accepted
02 Jul 2019
First published
03 Jul 2019

J. Mater. Chem. A, 2019,7, 17906-17913

Direct observation of reversible conversion and alloying reactions in a Bi2(MoO4)3-based lithium-ion battery anode

A. Ruud, J. Sottmann, P. Vajeeston and H. Fjellvåg, J. Mater. Chem. A, 2019, 7, 17906 DOI: 10.1039/C9TA03459E

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