High Performance Binder-Free SiOx/C Composite LIB Electrode Made of SiOx and Lignin

Jie Pan, Tao Chen, Jiazhi Hu, Long Zhang, Yiyang Liu, Yang-Tse Cheng

Research output: Contribution to journalArticlepeer-review

42 Scopus Citations

Abstract

A high performance binder-free SiOx/C composite electrode was synthesized by mixing SiOx particles and Kraft lignin in a cryo-mill followed by heat treatment at 600 degrees C. After the heat treatment, lignin formed a conductive matrix hosting SiOx particles, ensuring electronic conductivity, connectivity, and accommodation of volume changes during lithiation/delithiation. As the result, no conventional binder or conductive agent was necessary. When electrochemically cycled, the composite electrode delivered excellent performance, maintaining ~900 mAh g-1 after 250 cycles at a rate of 200 mA g-1, and good rate capability. The robustness of the electrode was also examined by post-cycling SEM images, where few cracks were observed. The excellent electrochemical performance can be attributed to the comparatively small volume change of SiOx-based electrodes (160%) and the flexibility of the lignin derived carbon matrix to accommodate the volume change. This work should stimulate further interests in using bio-renewable resources in making advanced electrochemical energy storage systems.
Original languageAmerican English
Pages (from-to)236-242
Number of pages7
JournalJournal of Power Sources
Volume362
DOIs
StatePublished - 2017

NREL Publication Number

  • NREL/JA-5K00-69033

Keywords

  • lignin
  • lithium-ion battery
  • renewable
  • SiOx/C composite electrode

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