Improving stability of Li-Ion batteries by means of transition metal ions trapping separators

Anjan Banerjee, Baruch Ziv, Yuliya Shilina, Shalom Luski, Doron Aurbach, Ion C. Halalay

Research output: Contribution to journalArticlepeer-review


Transition metal ions dissolution from positive electrodes initiates a well-known degradation mechanism in Li-ion cells, which limits their operational life. Preventing its consequences should be considered as a breakthrough in the field. We show herein that trapping Mn ions by ion-chelating polymers placed in the inter-electrode space of cells with lithium manganate spinel and Li or graphite electrodes, and greatly improves their high temperature cycling performance. Mn cations trapping separators were fabricated in-house using a commercial resin consisting of iminodiacetic acid disodium salt functional groups on a styrene divinylbenzene polymeric matrix, either by their inclusion into a separator through a phase-inversion method or by coating onto a plain commercial separator. We determined and compared the surface and cross-section morphologies, electrolyte-uptake, porosity, ionic-conductivity, and electrochemical-stability of these separators with those of a baseline separator. LMO-Li cells containing phase-inversion separators had ∼15x less Mn on the Li-electrode than cells with the baseline separator, after 100 cycles at 55°C. LMO-graphite cells with phase-inversion separators had ∼6x less Mn on the graphite-electrode, after 100 cycles at 55°C than cells with the baseline-separator. Capacity losses after cycling at 55°C were 30% and 55%, respectively, for the cells with phase-inversion and baseline separators.

Original languageEnglish
Pages (from-to)A1083-A1094
JournalJournal of the Electrochemical Society
Issue number6
StatePublished - 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Renewable Energy, Sustainability and the Environment


Dive into the research topics of 'Improving stability of Li-Ion batteries by means of transition metal ions trapping separators'. Together they form a unique fingerprint.

Cite this