Lithium Substituted Poly(acrylic acid) as a Mechanically Robust Binder for Low-Cost Silicon Microparticle Electrodes

Dingying Dang, Yikai Wang, Ming Wang, Jiazhi Hu, Chunmei Ban, Yang Tse Cheng

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Silicon microparticles (SiMPs) are attractive anode materials for lithium ion batteries due to their high theoretical capacity, low cost, high initial Coulombic efficiency, and large packaging density. However, the substantial volume change induced by lithiation/delithiation causes the pulverization and loss of electronic conductivity of SiMPs, which lead to the fast capacity fading. In this study, we report that the cycling stability of SiMP electrodes can be effectively improved by using environmentally friendly and cost-efficient lithium (Li) substituted poly(acrylic acid) (PAA-xLi, x ≤ 1) as binders. Noticeably, the SiMP/PAA-0.75Li electrode with a mass loading of ∼0.9 mg/cm2 can deliver a significantly higher capacity (2125 mAh/g, 100 cycles) at C/3 (1200 mA/g) than that (730 mAh/g) made of the pristine PAA (i.e., PAA-0Li) binder. We focused on understanding the mechanism of PAA-xLi binders by correlating the mechanical properties of SiMP/PAA-xLi electrodes with their electrochemical stability. The effectiveness of PAA-0.75Li can be attributed to its high elasticity and strong adhesion with SiMPs, both of which greatly enhance the mechanical integrity of SiMP electrodes and help keep pulverized SiMPs coalesced during cycling. These findings offer important design principles of binders for low-cost SiMP electrodes.

Original languageEnglish
Pages (from-to)10940-10949
Number of pages10
JournalACS Applied Energy Materials
Volume3
Issue number11
DOIs
StatePublished - Nov 23 2020

Bibliographical note

Funding Information:
This work was supported by the National Science Foundation Award No. 1355438. The authors also acknowledge the support by the Assistant Secretary for Energy Efficiency and Renewable Energy, Vehicle Technologies Office of the U.S. Department of Energy Battery Materials Research (BMR) Program under Contract Number DE-EE0007787.

Publisher Copyright:
© 2020 American Chemical Society

Keywords

  • Lithium ion battery
  • Mechanical integrity
  • Poly(acrylic acid)
  • Polymeric binder
  • Silicon microparticle electrode

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Electrical and Electronic Engineering
  • Materials Chemistry

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