Enhanced charge capacity and stability of Germanium(IV) Sulfide-Based anodes through Triton X100-Assisted synthesis and polysulfide shuttle mitigation

Dmitry A. Grishanov, Vitaly A. Nikolaev, Jenny Gun, Alexey A. Mikhaylov, Alexander G. Medvedev, Petr V. Prikhodchenko, Ovadia Lev

Research output: Contribution to journalArticlepeer-review

Abstract

Highly soluble germanium oxide, an amorphous macroreticular form of germanium oxide, was used as a precursor for the deposition of GeS2 on reduced graphene oxide (rGO) through a low-temperature, wet-chemistry process. Thermal treatment of the solid provided an ultrathin rGO – supported amorphous GeS2 coating. The GeS2@rGO composite was tested as a lithium ion battery (LIB) anode. Leveraging the versatility of wet chemistry processing, we employed strategies initially developed for mitigating polysulfide shuttle effects in lithium-sulfur batteries to enhance anode performance. The anode exhibited exceptional stability, surpassing 1000 cycles, with charge capacities exceeding 1220 and 870 mAh.g−1 at rates of 2 and 5 A.g−1, respectively. Performance improvements were achieved by minimizing GeS2 grain size using the non-ionic surfactant Triton X-100 during synthesis and preventing polysulfide shuttle effects through a negatively charged thick glass fiber separator, fluoroethylene carbonate additive (FEC) in EC:DEC (ethylene carbonate: diethyl carbonate) solvent, and a polyacrylic acid (PAA) binder. These cumulative modifications more than tripled the charge capacity of the germanium sulfide LIB anode. Feasibility was further demonstrated through full cell studies using a LiCoO2 counter electrode.

Original languageAmerican English
Pages (from-to)780-791
Number of pages12
JournalJournal of Colloid and Interface Science
Volume660
DOIs
StatePublished - 15 Apr 2024

Keywords

  • Germanium sulfide
  • Lithium-ion battery
  • Polysulfides
  • Polysulfides shuttle effects

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Biomaterials
  • Colloid and Surface Chemistry

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