Electrochemical Properties and Challenges of Type II Silicon Clathrate Anode in Sodium Ion Batteries

Xuemin Li, Kaitlin Fink, Shriram Santhanagopalan, Chuanxiao Xiao, Kenneth Steirer, Lakshmi Krishna

Research output: Contribution to journalArticlepeer-review

6 Scopus Citations

Abstract

The development of advanced anodes for low-cost room temperature sodium-ion batteries (SIBs) with high cycling stability is of great significance. Silicon clathrates are promising intercalation anodes due to their cage-like frameworks. It is predicted that the open cages can easily accommodate alkali ions with negligible volume changes. However, the complicated surface structure and chemical reactions make it challenging to understand the electrochemical performance of clathrate anodes in SIBs. In this paper, we evaluated the performance of type II clathrate anodes in SIBs. A slightly elevated testing temperature (45°C) is shown to improve the cell capacity and rate performance due to the improved ionic conductivity. However, side reactions on the solid electrolyte interface (SEI) and loss of active material during the first sodiation process contribute to the low Coulombic efficiency during the first cycle. Analysis is supported by electrode morphology, elemental mapping, and X-ray photoelectron spectroscopy (XPS) on the clathrate electrodes at different electrochemical states. Na+ ion transport behavior between clathrate cages and surface in terms of migration barriers was also computed to explain the positive effect of higher cell testing temperature, and the low Coulombic efficiency of the first cycle.

Original languageAmerican English
Pages (from-to)A3051-A3058
JournalJournal of the Electrochemical Society
Volume166
Issue number13
DOIs
StatePublished - 2019

Bibliographical note

Publisher Copyright:
© The Author(s) 2019.

NREL Publication Number

  • NREL/JA-5400-73015

Keywords

  • anode performance assessment
  • sodium ion batteries
  • type II silicon clathrate

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