2D Silicon-Germanium-Layered Materials as Anodes for Li-Ion Batteries
Journal article, 2021

To address the volume changes of Si-based and Ge-based anode materials during lithiation and delithiation, two-dimensional (2D) composites like siloxene and germanane have recently been developed. These 2D materials can insert alkali cations without an alloying reaction, thereby limiting the associated volume expansion. While Si has a high theoretical capacity and low cost, its electrical conductivity is low; on the other hand, Ge provides a higher electronic conductivity but at a higher cost. Therefore, we propose a series of 2D Si-Ge alloys, that is, Si1-xGex with 0.1 < x < 0.9, referred to as siliganes, with reasonable cost and encouraging electrochemical performance. The layered siliganes were obtained by fully deintercalating Ca cations from the Ca(Si1-xGex)2 parent phases and used as Li-ion battery (LIB) anodes. XRD, SEM, Raman spectroscopy, and infrared spectroscopy were used to characterize the materials and identify the mechanisms occurring during cycling in LIBs. Siligane_Si0.9Ge0.1 was identified as the best candidate; at a current density of 0.05 A g-1, after 10 cycles, it showed a reversible capacity of 1325 mA h g-1, with high capacity retention and coulombic efficiency.

lithium-ion battery

anode

layered materials

siligane

siloxene

germanane

Author

Xi Chen

Alistore - European Research Institute

University of Picardie Jules Verne

Réseau sur le Stockage Electrochimique de l'Energie (RS2E)

Laura Loaiza Rodriguez

Chalmers, Physics, Materials Physics

Alistore - European Research Institute

L. Monconduit

Alistore - European Research Institute

Réseau sur le Stockage Electrochimique de l'Energie (RS2E)

V. Seznec

University of Picardie Jules Verne

Alistore - European Research Institute

Réseau sur le Stockage Electrochimique de l'Energie (RS2E)

ACS Applied Energy Materials

25740962 (eISSN)

Vol. 4 11 12552 -12561

Highly concentrated electrolytes: Cell optimizations and fundamentals

Centre national de la recherche scientifique (CNRS) (FRCNRS3104), 2015-08-01 -- 2020-07-31.

Subject Categories

Inorganic Chemistry

Materials Chemistry

Condensed Matter Physics

DOI

10.1021/acsaem.1c02362

More information

Latest update

12/2/2021