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This content will become publicly available on December 6, 2018

Title: High capacity Li-ion battery anodes: Impact of crystallite size, surface chemistry and PEG-coating

Battery electrodes are complex mesoscale systems comprised of an active material, conductive agent, current collector, and polymeric binder. Previous work showed that introduction of poly [3-(potassium-4-butanoate) thiophene] (PPBT) as a binder component coupled with a polyethylene glycol (PEG) surface coating on magnetite (Fe 3O 4) nanoparticles enhanced electron and ion transport in the high capacity anode system. Here, the impact of Fe 3O 4 crystallite size (10 nm vs. 20 nm) and surface chemistry were explored to evaluate their effects on interfacial interactions within the composite PEG/PPBT based electrodes and resultant battery performance. The Fe 3O 4 synthesis methods inevitably lead to differences in surface chemistry. For instance, the Fe 3O 4 particles synthesized using ammonium hydroxide appeared more dispersed, and afforded improved rate capability performance. Notably, chemical interactions between the active nanoparticles and PPBT binder were only seen with particles synthesized using triethylamine. Capacity retention and cycling performance were unaffected. Thus, this study provides fundamental insights into the significant impact of active material synthesis on the design and fabrication of composite battery electrodes.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [4] ;  [4] ;  [5] ;  [6] ;  [5] ;  [7]
  1. Georgia Inst. of Technology, Atlanta, GA (United States). Dept. of Chemical and Biomolecular Engineering
  2. Stony Brook Univ., NY (United States). Dept. of Materials Science and Engineering
  3. Stony Brook Univ., NY (United States). Dept. of Chemistry
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Energy Sciences Directorate
  5. Stony Brook Univ., NY (United States). Dept. of Materials Science and Engineering and Dept. of Chemistry
  6. Stony Brook Univ., NY (United States). Dept. of Materials Science and Engineering and Dept. of Chemistry; Brookhaven National Lab. (BNL), Upton, NY (United States). Energy Sciences Directorate
  7. Georgia Inst. of Technology, Atlanta, GA (United States). Dept. of Chemical and Biomolecular Engineering and Dept. of Chemistry and Biochemistry and Dept. Materials Science and Engineering
Publication Date:
Report Number(s):
BNL-203442-2018-JAAM
Journal ID: ISSN 0013-4686
Grant/Contract Number:
SC0012704; SC0012673; AC02-06CH11357; 1109408
Type:
Accepted Manuscript
Journal Name:
Electrochimica Acta
Additional Journal Information:
Journal Volume: 260; Journal Issue: C; Journal ID: ISSN 0013-4686
Publisher:
Elsevier
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); Georgia Inst. of Technology, Atlanta, GA (United States)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Fe3O4; Magnetite; Poly[3-(potassium-4-butanoate) thiophene]; Poly(thiophene); Binders
OSTI Identifier:
1431445