Low cost and environmentally benign crack-blocking structures for long life and high power Si electrodes in lithium ion batteries

Min Ling, Hui Zhao, Xingcheng Xiao, Feifei Shi, Mingyan Wu, Jingxia Qiu, Sheng Li, Xiangyun Song, Gao Liu, Shanqing Zhang

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

The high capacity Si (4200 mA h g-1, Li4.4Si) commonly undergoes cracking and delamination due to drastic volume change (∼300%) during lithiation/delithiation processes in lithium ion batteries (LIBs). In this work, abundant and sustainable natural polymer gum arabic (GA) and low cost polyacrylic acid (PAA) are used to fabricate Si anodes with resilient, crack-blocking properties. The esterification reaction between GA and PAA establishes a flexible network resulting in reinforced mechanical strength and enhanced coherent strength. Meanwhile, the water vapour resulting from the esterification reaction generates micron-sized pores which relieves the stress and blocks the formation and propagation of cracks. As a result of the crack-blocking effect, the resultant Si anodes present a superior volumetric capacity of 2890 A h L-1. In addition, charge-discharge cycling for more than 1000 cycles is achieved with the Li insertion capacity limited to 1000 mA h g-1 at a 1 C rate.

Original languageEnglish (US)
Pages (from-to)2036-2042
Number of pages7
JournalJournal of Materials Chemistry A
Volume3
Issue number5
DOIs
StatePublished - Feb 7 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Fingerprint Dive into the research topics of 'Low cost and environmentally benign crack-blocking structures for long life and high power Si electrodes in lithium ion batteries'. Together they form a unique fingerprint.

Cite this