Journal of Materials Research

Articles

Li(Al1–zZnz) alloys as anode materials for rechargeable Li-ion batteries

I. Chumaka1 c1, G. Dmytriv, V. Pavlyuka2, S. Oswald, J. Eckerta3 c2, H. Trill, H. Eckerta4, H. Paulya5 and H. Ehrenberga6

a1 IFW Dresden, Institute for Complex Materials, 01069 Dresden, Germany

a2 Department of Inorganic Chemistry, Ivan Franko Lviv National University, 79005 Lviv, Ukraine

a3 IFW Dresden, Institute for Complex Materials, 01069 Dresden, Germany

a4 Institute for Physical Chemistry, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany

a5 Technische Universität Darmstadt, Materials Science, 64287 Darmstadt, Germany

a6 IFW Dresden, Institute for Complex Materials, 01069 Dresden, Germany

Abstract

The cycling behavior of anode materials based on alloys from the Li(Al1–z Zn z ) continuous solid solution has been studied. The performance of the most promising composition Li(Al0.8Zn0.2) was tested in half-cells against metallic Li with three different electrolytes and in full Li-ion cells against a V2O5 cathode. The underlying structure evolution during cycling and the most relevant fatigue mechanisms are elucidated by x-ray diffraction, nuclear magnetic resonance, and x-ray photoelectron spectroscopy, and reveal a loss of mobile Li due to the ongoing formation of solid electrolyte interfaces. An enhanced stability for Li(Al1–z Zn z ) electrodes with z˜0.2 results from a peculiar microstructure due to the decomposition of Al and Zn in the Li-poor state and their intermixing in the Li-rich state.

(Received December 15 2009)

(Accepted March 26 2010)

Key Words:

  • Energy storage;
  • Fatigue;
  • Li

Correspondence:

c1 Address all correspondence to this author. e-mail: i.chumak@ifw-dresden.de

c2 This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr_policy

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