Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 2, Pages 764-767Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2010.07.073
Keywords
Li7La3Zr2O12; Solid electrolyte; Lithium secondary batteries; Electrochemical performance; Interface reaction
Funding
- New Energy and Industrial Technology Development Organization (NEDO)
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The interfacial layer formed between a lithium-ion conducting solid electrolyte, Li7La3Zr2O12 (LLZ), and LiCoO2 during thin film deposition was characterized using a combination of microscopy and electrochemical measurement techniques. Cyclic voltammetry confirmed that lithium extraction occurs across the interface on the first cycle, although the nonsymmetrical redox peaks indicate poor electrochemical performance. Using analytical transmission electron microscopy, the reaction layer (similar to 50 nm) was analyzed. Energy dispersive X-ray spectroscopy revealed that the concentrations of some of the elements (Co, La, and Zr) varied gradually across the layer. Nano-beam electron diffraction of this layer revealed that the layer contained neither LiCoO2 nor LLZ, but some spots corresponded to the crystal structure of La2CoO4. It was also demonstrated that reaction phases due to mutual diffusion are easily formed between LLZ and LiCoO2 at the interface. The reaction layer formed during high temperature processing is likely one of the major reasons for the poor lithium insertion/extraction at LLZ/LiCoO2 interfaces. (C) 2010 Elsevier B.V. All rights reserved.
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