Performance of CuP2 Negative Electrode for Na-Ion Batteries with CNTs As Stabilizer

Research output: Contribution to journalResearch articleContributedpeer-review


  • En Zhang - , Chair of Inorganic Chemistry I (Author)
  • Arka Saha - , Bar-Ilan University (Author)
  • Guangshen Jiang - , TUD Dresden University of Technology (Author)
  • Xiaosa Xu - , TUD Dresden University of Technology (Author)
  • Alina Yarmolenko - , Bar-Ilan University (Author)
  • Tarik Aziz - , Bar-Ilan University (Author)
  • Grothe Julia - , TUD Dresden University of Technology (Author)
  • Gilbert Daniel Nessim - , Bar-Ilan University (Author)
  • Stefan Kaskel - , Chair of Inorganic Chemistry I, Fraunhofer Institute for Material and Beam Technology (Author)


Transition metal phosphides (TMPs) are promising anode materials for sodium ion battery, thanks to their high theoretical specific capacities. Nevertheless, they suffer from large volume change and from poor conductivity during prolonged cycling. Here we systematically investigate the role of different kinds of single/multi-wall carbon nanotubes (SWCNTs/MWCNTs) as additives in order to stabilize copper phosphide particles (CuP2) as anode materials in sodium ion batteries (SIBs). All composites show enhancement in the overall capacity and cycling stability compared to the pristine CuP2 due to the well-connected CNTs on and between the CuP2 particles. At a high currency density of 1 A g−1, CuP2@SWCNTs composite with 13 wt.% SWCNTs can deliver a specific capacity over 400 mAh g−1 for more than 60 cycles, much better than conventional hard carbon materials. The CNTs enhance the conductivity and reduce capacity loss caused by the volume variation of CuP2 based electrode materials. Post-mortem analysis by scanning electron microscopy depicts a possible battery failure mechanism, whereby the solid electrolyte interface exists in the form of nanospheres distributing at the surface of the electrode. During the repeated cycling (volume change), more fractures and cracks occur resulting in continuous interfacial reactions and consumption of sodium and electrolyte.


Original languageEnglish
Article numbere202400231
Issue number18
Publication statusPublished - 13 May 2024


ASJC Scopus subject areas


  • Cathode, Na-ion Battery, TMPs